基金Project supported by the National Natural Science Foundation of China under Grant (10274055) and the ScientificResearch Foundation of Education Bureau of Gansu Province of China under Grant (0410 -01).
基金Project supported by the National Natural Science Foundation of China under Grant No.10274055Scientific Research Foundation of Education Bureau of Gansu Province of China under Grant No.0410-01.
基金This work was supported by the National Natural Science Foundation of China (No.11064007 and No.11164013), the Natural Science Foundation of Gansu Province of China (No.1014RJZA046), the Program for New Century Excellent Talents in University, and the Key Project of Chinese Ministry of Education (No.209127).