国家自然科学基金项目41201183;黑龙江省教育厅科技项目12531209;哈尔滨师范大学青年学术骨干项目KJB201201 [Foundation:National Natural Science Foundation of China,No.41201183; Science and Technology Project Foundation of Heilongjiang Province Education Department,No.12531209; Youth Elite Planning Project of Harbin Normal University,No.KJB201201]