supported by the National Natural Science Foundation of China (10874052);Foundation for the Author of National Excellent Doctoral Dissertation of China (200726);Natural Science Foundation of Jiangsu Province,China (BK2010499);Natural Science Fund for Collegesand Universities in Jiangsu Province,China (11KJB140012);General Program of Yancheng Institute of Technology,China (XKY2011014)~~
supported by the National Natural Science Foundation of China(10874052);Foundation for the Author of National Excellent Doctoral Dissertation of China(200726)~~