1. School of Applied Science
2. Taiyuan University of Science and Technology
3. Taiyuan 030024
4. P. R. China
5. Shanxi Key Laboratory of Metal Forming Theory and Technology
6. School of Material Science and Engineering
7. Department of Mechanical Engineering
8. Tennessee Technological University
9. Cookeville
10. USA
11. Department of Electronic Science and Engineering
12. Key Laboratory of Photo-Electronic Thin Film Device and Technology of Tianjin
13. Nankai University
14. Tianjin 300350