国家自然科学基金面上项目No.61274047、国家自然科学基金重点项目No.61435013和国家自然科学青年基金Nos.61307034,61205044资助;The General Program of National Natural Science Foundation of ChinaNo.61274047,the Key Program of National Natural Science Foundation of China No.61435013,the National Natural Science Foundation for Young Scholars of China Nos.61307034,61205044