Supported by National Natural Science Foundation of China(Grant No.11004050);the Science Foundation of Hengyang Normal University,China(Grant No:10A47).
Project supported by the National Natural Science Foundation of China(11004050);the Science and Technology Research Foundation of Hunan Province,China(2010FJ4120);the Natural Science Foundation of Hunan Province, China(11JJ6063)
the National Natural Science Foundation of China(1100-1050);the Key Scientifie Research Fund of Hunan Provincial Education Department,China(09A013);the Scientific Research Fund of Hunan Provincial Education Department, China(10B013);the Science and Technology Research Foundation of Hunan Province,China(2010FJ4120)
Supported by the Natural Science Foundation of Hunan Province(06JJ50118);The Science Foundation of Hengyang Normal University(08B35);key Scientific Research Fund of Hunan Provincial Education Depart ment of China(Grant No.09A013)