基金This research was supported by the National Science Foundation of China (20572015, 20672028)Program for NewCentury Ex-cellent Talents in University (NCET-05-0610)+3 种基金the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Min-istry (SRF for ROCS, SEM)Program for Young Excellent Talents in Henan UniversitiesFoundation of Education Department of Henan Province(2006150004)Program for Extraordinary Professors of Henan University and the Key Foundation of Henan University (04ZDZR013)