1. School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, P.R. China
2. School of Materials Science and Engineering, Dalian University of Technology, Dalian, P.R. China
3. CPI Northeast New Energy Development CO. Ltd. Dalian Tuoshan Wind Power Plant, Dalian, P.R. China
4. College of Mechanics and Materials, Hohai University, Nanjing, P.R. China