基金Supported by the National Natural Science Foundation of China under Grant 10675106 and the Talented Person Troop Items of Basic Construction of Anhui University.
基金Supported by the National Natural Science Foundation of China under Grant No 10674025 and the Doctoral Foundation of the Ministry of Education of China under Grant No 20070386002.
基金The project supported by the President Foundation of the Chinese Academy of Sciences and National Natural Science Foundation of China under Grant No. 10475657
基金The project supported by National Fundamental Research Program of China under Grant No. 2005CB724508 and National Natural Science Foundation of China under Grant Nos. 60478029, 90503010, and 10575040 .We would like to thank enlightening discussions professor Wu Ying for many