supported by NSFC(No.11001071,No.11171320);the Fundamental Research Funds for the Central Universities(No.2011HGCX1080,No.WK0010000014,No.WK0010000015)
Supported by the National Natural Science Foundation of China(No.10801103);by the Natural Sciences Fund for Colleges and Universities in Jiangsu Province(No.08KJB110010)