国家自然科学基金41261045;重庆市基础科学与前沿技术研究重点cstc2015jcyjBX0128;重庆师范大学研究生科研创新项目YKC16003. [National Natural Science Foundation of China,No.41261045;Key Basic Science and Cutting-edge Technology Research of Chongqing,No.cstc2015jcyjBX0128;Chongqing Normal University Graduate Student Research Innovation Project,No,YKC16003.]