国家自然科学基金61602380,61373117,61673319;陕西省教育厅科学研究项目16JK217S;高等学校博士学科点专项科研基金20136101110019;National Natural Science Foundation of China61602380,61373117,61673319;Scientific Research Project of Shaanxi Provincial Department of Education16JK2178;Special Research Fund for the Doctoral Program of Higher Education20136101110019