国家自然科学基金项目(61273092,61203012),教育部重大研究项目(311012),天津市应用基础及前沿技术研究计划项目((12JCZDJC30300),燕山大学青年教师自主研究课题(14LGB027)资助.Supported by National Natural Science Foundation of China (61273092, 61203012), Key Grant Project of Chinese Ministry of Education (311012),Tianjin Research Program of Application Foundation and Advanced Technology (12JCZDJC30300) and Young Teachers Independent Research Pro-gram of Yanshan University (14LGB027).