作者机构:[1]College of Materials Science & Engineering, Northwestern Polytechnical University, Xi'an 710072, China
相关基金:This work was financially supported by the National Natural Science Foundation of China (No.50475144), the State Key Foundational Research Plan (No.G2000067206), and the Teaching and Research Award Fund for 0utstanding Young Teachers in Higher Education Institutions of the Ministry of Education of China.