1. School of Electrical Engineering, Yanshan University, Qinhuangdao 066004, P. R. China
2. School of Mechanical Engineering, Yancheng Institute of Technology, Yancheng 224051, P. R. China
3. Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130022, P. R. China
4. Institute of Structured and Architected Materials, Liaoning Academy of Materials, Shenyang 110167, P. R. China