国家自然科学基金 (30800618),国家级大学生创新训练项目(201210698110),西安交通大学本科生科研训练和实践创新基金 (2012125).
Supported by National Natural Science Foundation of China (30800618), National Innovation Training Program for University Students (201210698110), and Scientific Training and Practice Innovation Program for Undergraduates of Xi’an Jiaotong University (2012125).