作者机构:[1]College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, China, [2]College of Physics and Information Engineering, Henan Normal University, Xinxiang 453002, China
相关基金:Project supported by the National Natural Science Foundation of China (Grant No 60777012) and the Program for Science &Technology Innovation Talents in Universities of Henan Province in China (Grant No 2008HASTIT008).