浙江省自然科学基金No.LQ14C030001,LY13C030003;浙江省新苗人才计划No.2014R428010;台州学院2014校立项目 Supported by the Natural Science Foundation of Zhejiang Province No.LQ14C030001,LY13C030003,the New Talent Plan of Zhejiang ProvinceNo.2014R428010 and the Scientific Research Project of Taizhou University of 2014