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KIZ OpenIR  > 科研部门  > 分子进化与基因组多样性（张亚平）
The Systematic Status of Rhacophorid Frogs
Li JT1,2; Rao DQ2; Murphy RW2,3; Zhang YP*2
2011
发表期刊ASIAN HERPETOLOGICAL RESEARCH
卷号2期号:1页码:1-11
合作性质其它
摘要

The frog family Rhacophoridae recently underwent notable reorganization and taxonomic rearrangement. Several new genera were erected to reflect evolutionary history, including Ghatixalus, Gracixalus, Feihyla, Liuixalus and Raorchestes. Herein, we reviewed the systematics and phylogeny of the rhacophorids, the definition of the family Rhacophoridae and its tribes, and the taxonomic history and diagnoses of the genera of this family. Also, we suggest future directions for research.

关键词Progress Prospect Faunal Survey Systematics Amphibian China
资助者This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001).
收录类别SCI
语种英语
资助者This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001). ; This work was supported by China Postdoctoral Science Foundation Funded Project (No. 20100471689), the ‘Xibuzhiguang’ Project of Chinese Academy of Sciences, the ‘Lingyuqianyan’ Project of Chinese Academy of Sciences to Jiatang LI, the National Natural Science Foundation of China (Grant Nos. 30911120031, 31071894, 30670243) and the Basic Research Program of the National Science and Technology of China (Grant Nos. 2006FY110500-3, 2008GA001).
文献类型期刊论文
条目标识符http://ir.kiz.ac.cn/handle/152453/10433
专题科研部门_分子进化与基因组多样性（张亚平）
遗传资源与进化国家重点实验室
科研部门_兽类生态与进化（蒋学龙）
作者单位1.Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China
2.State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, Yunnan, China
3.Centre for Biodiversity and Conservation Biology, Royal Ontario Museum, 100 Queen’s Park, Toronto, Ontario M5S 2C6, Canada
推荐引用方式
GB/T 7714		 Li JT,Rao DQ,Murphy RW,et al. The Systematic Status of Rhacophorid Frogs[J]. ASIAN HERPETOLOGICAL RESEARCH,2011,2(1):1-11.
APA Li JT,Rao DQ,Murphy RW,&Zhang YP*.(2011).The Systematic Status of Rhacophorid Frogs.ASIAN HERPETOLOGICAL RESEARCH,2(1),1-11.
MLA Li JT,et al."The Systematic Status of Rhacophorid Frogs".ASIAN HERPETOLOGICAL RESEARCH 2.1(2011):1-11.
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