基金Supported by the National Natural Science Foundation of Education Depart ment of HenanProvince of China (2006110002) ,the Science Foundation of Henan University of Science and Technology(2004ZD002 ,2006ZY001)
基金Supported by the Natural Science Foundation of Henan Province of China(0111050200) Natural Science Foundation of Education Committee of Henan Province of China(2003110003)the Science Foundation of Henan University of Science and Technology(2003ZY03)
