基金supported by the National Natural Science Foundation of China(30870331)the Collegial Science Foundation of Education Office ofLiaoning Province(2008S213)the Research Foundation of the Experiment Centre of Shenyang Normal University(SY200801)
基金supported by the National Natural Science Foundation of China ( 30870331,31093430)the Collegial Science Foundation of Education Office of Liaoning Province ( 2008S213 )the Research Foundation of the Experiment Centre of Shenyang Normal University( SY200801)