国家自然科学基金项目41401419;重庆市教委科学技术研究项目KJ1501123;重庆文理学院学生科研项目XSKY2016089.National Natural Science Foundation of China41401419;Scientific and Technological Research Program of Chongqing Municipal Education CommissionKJ1501123;Student Research Project of Chongqing Academy of Arts and SciencesXSKY2016089