基金Supported by the Natural Science Foundation of Jiangsu Education Office(06KJB110010)Jiangsu Planned Projects for Postdoctoral Research Funds (203003401)
基金This work was supported by the National Natural Science Foundation of China (10471151)National 863 Project(2003AA148040)the Educational Science Foundation of Chongqing,Chongqing of China(041302).