本文课题受国家自然科学基金青年科学基金项目编号81301696;河北省高等学校自然科学青年基金项目编号2011105;河北省自然科学基金项目编号H201206134资助@@@@This work was supported by grants from the National Natural Science Foundation for Distinguished Young Scholars of China81301696;the National Natural Science Foundation for Distinguished Young Scholars of Hebei Province2011105;the Hebei Provincial Natural Science FoundationH201206134