Supported by Projects from NSF of China(10571147);Specialized Research Fund for Doctoral Programof Higher Education of China(20094301110001);NSF of Hunan Province (09JJ3002);Hunan Provincial Innovation Foundation for Postgraduate(S2008yjscx02)
Foundation item: the National Nature Science Foundation (10171067) Shanghai Municipal Education Commission (04DB07)The Special Funds for Major Specialties of Shanghai Education Committee.