国家自然科学基金61402540, 61103108;湖南省教育厅科学研究项目13C095;湖南省科技支撑计划2014GK3049
National Natural Science Foundation of China61402540, 61103108;Scientific Research Fund of Hu'nan Provincial Education Departmentof China13C095;Hu'nan Provincial Science and Technology Foundation of China2014GK3049