1. College of Material Science and Engineering, Southwest University of Science & Technology, Mianyang, Sichuan 621900, China
2. Institute
of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-311, Mianyang, Sichuan 621900, China
3. Department
of Mathematics and Physics, Officers College of CAPF, Chengdu 610213, China