国家自然科学基金项目30870454,30470318;山西省回国留学人员科研资助项目2012013;山西省科技攻关项目20120322008-02;the National Natural Science Foundation of China30870454,30470318;the Research Project Funded by Shanxi Scholarship Council of China2012013;the Provincial Programs for Science and Technology Development of Shanxi Province20120322008-02