Supported by National Natural Science Foundation of China(No.50969007 and 50978099);Ph.D.Programs Foundation of Ministry of Education of China(No.20100480609);Natural Science Foundation of Jiangxi Province(No.20114BAB206012);Project of Jiangxi Provincial Department of Education Science and Technology(No.GJJ12629 and GJJ11252);the Second Round Students'Scientific Research Training Plan of Nanchang Institute of Technology~~