国家自然科学基金项目41102002,41272117;河南省基础与前沿项目162300410256;河南理工大学博士基金项目编号:B2013-075共同资助.[Co-funded by the National Natural Science Foundation of China.41102002,41272117;the Basic and Frontiers Research Program of Henan Province162300410256;the Doctoral Foundation of Henan Polytechnic UniversityNo.B2013-075]