国家自然科学基金61271024,61322103;高等学校博士学科点专项科研基金博士生导师类基金20130203110013;陕西省自然科学基础研究计划2015JZ016 Foundation Items:The National Natural Science Foundation of China61271024,61322103;The Foundation for Doctoral Supervisor of China20130203110013;The Natural Science Foundation of Shaanxi Province2015JZ016