基金Supported by the NSFC(Grant No.50602009 ,50972034)Program of the Ministry of Education of China for New Cen-tury Excellent Talents in University(Grant No.NCET-06-0345)+1 种基金Postdoctoral Science Research Developmental Foun-dation of Heilongjiang Province (Grant No.LBH-Q06068)SRF for ROCS,SEMand NI H(Grant No.P41-EB21820)