The project was supported by National Natural Science Foundation of China(11231005);Doctoral Program Foundation of the Ministry of Education of China(20110076110004)
supported by National Natural Science Foundation of China(10971068,11231005);Doctoral Program Foundation of the Ministry of Education of China(20110076110004);Program for New Century Excellent Talents in University(NCET-09-0356);"the Fundamental Research Funds for the Central Universities"