(Funding) :This work was supported by Hunan Provincial Innovation Foundation for Postgraduate (CX2014A005), the Fundamental Research Funds for the Central Universities of Central South University, the National Natural Science Foundation of China (Number 81201420, 81272034, 81472130), the Provincial Science Foundation of Hunan (Number 14JJ3032), the Scientific Research Project of the Development and Reform Commission of Hunan Province ((2013)1199), the Scientific Research Project of Science and Technology Office of Hunan Province (2013SK2018), and the Doctoral Scientific Fund Project of the Ministry of Education of China (20120162110036).