基金Project(2007CB613700) supported by the National Basic Research Program of ChinaProject(50725413) supported by the National Natural Science Foundation of China+2 种基金Project(CDJXS11132228) supported by the Fundamental Research Funds for the Central Universities,ChinaProjects(2010DFR50010,2008DFR50040) supported by International Cooperation Program,ChinaProjects (CSTC2009AB4008,2010CSTC-HDLS) supported by Chongqing Sci & Tech Program,China