Supported by National Natural Science Foundation of China(No.31172078;.30770294);Natural Science Foundation of Shanxi Province(No.2009011040-1);Research Fund for Doctoral Program of Higher Education of China(No.20111401110008)~~
supported by grants from The National Natural Scientific Foundation of China(No.30770294 and 30940043);The Natural Scientific foundation of Shanxi(No.2009011040-1)~~