国家自然科学基金资助项目81171122,81371324;黑龙江省自然科学基金资助项目ZD201208;高等学校博士学科点专项科研基金资助项目20132307110008National Natural Science Foundation of China81171122,81371324;Natural Science Foundation of Heilongjiang Province of ChinaZD201208;Specialized Research Fund for the Doctoral Program of Higher Education of China20132307110008