国家自然基金41172316;国家教育部重点项目211026;山西省青年科技研究基金2011021025-2;山西省回国留学人员科研项目2011080资助.Supported by the National Natural Science Foundation of China41172316;the Key Project of the National Ministry of Education of China211026;Shanxi Province Science Foundation for Youths2011021025-2;Shanxi Province Foundation for Returness2011080