Supported by the Nature Science Foundation of Heilongjiang Province(A201015);the Scientific Research Foundation of the Education Department of Heilongjiang Province(11541098);the Doctorial Fund of Harbin Normal University(KGB200901)
National Natural Science Foundation of China(No.10961005);the Sustentation Fund of the Elitists for Yulin Normal University(No. G2010006);the Scientific Research Foundation of Guangxi Education Office of China(No.200911LX356)