国家自然科学基金61461020和U1431110;江西省国际合作基金批准号:20133BDH80007和20132BDH80013资助的课题.* Project supported by the National Science Foundation of China,Grant 61461020, U1431110;the International Cooperation Funds and Science and Technology Innovation Team of Jiangxi Province of ChinaGrant .20133BDH80007,20132BDH80013