supported by National Natural Science Foundation of China(10971068);Doctoral Program Foundation of the Ministry of Education of China(20110076110004);Program for New Century Excellent Talents in University(NCET-09-0356);"Fundamental Research Funds for the Central Universities"
supported by Anhui Province Youth Foundation(2009SQRZ166);National Natural Science Foundation of China(10971068);National Basic Research Program of China(973 Program)(2007CB814904);Program for New Century Excellent Talents in University(NCET-09-0356)