基金Project supported by the National Outstanding Youth ScienceFoundation of China (Grant No. 50425206), the National NaturalScience Foundation of China (Grant No. 10647132), the NaturalScience Foundation of Hunan Provincial Education Department(Grant No. 06C652), and the Natural Science Foundation of HunanProvincial Education Department (Grant No. 06C653).
基金This work was supported by National Natural Science Foundation of China(No.1037 4031)and Natural Science Foundation of the South China University of Technology(No.123-E4050600).
