国家自然科学基金面上资助项目,Nos.81071775,81172064,81160311,81001068,81101621%湖北省自然科学重点基金资助项目,No.2011CDA030%中国博士后科学基金面上资助项目,No.2013M531983%National Natural Science Foundation of China,Nos.81071775,81101621,81160311,81172064,and 81001068%the Key Project of Science Foundation of Hubei Province,No.2011CDA030%the China Postdoctoral Science Foundation,No.2013M5319834