基金This research was partially supported by the National Natural Science Foundation of China(Grant No.10171118,10471159)the key project of the Chinese Ministry of Education,Supported by Program for New Century Excellent Talents in University.
基金This work is supported by the Natural Science Foundation of China (Grant No.10471159,No.10171118)NCET,Education Commission project Research Foundation of Chongqing(Grant No.KJ060818,KJ060804)
