国家自然科学基金项目No.81373702,No.81473567,No.81202632,教育部博士点基金项目No.20124323120003,湖南省自然科学基金项目No.13JJ3097,湖南省教育厅科研项目No.14B134,No.15K092;National Natural Science Foundation of China No.81373702,No.81473567,No.81202632,The Ph.D.Programs Foundation of Ministry of Education of China No.20124323120003,Natural Science Foundation of Hunan Province No.13JJ3097,Scientific Research Project of Hunan Education Department No.14B134,No.15K092