1. School of Mechanical Engineering
2. Hebei University of Technology
3. Tianjin 300401
4. China
5. CAS Key Laboratory of Standardization and Measurement for Nanotechnology
6. CAS Center for Excellence in Nanoscience
7. National Center for Nanoscience and Technology
8. Beijing 100190
9. Department of Geriatric Laboratory Medicine
10. Chinese PLA General Hospital
11. Beijing 100853
12. University of Chinese Academy of Sciences
13. Beijing 100049
14. State Key Laboratory of Nonlinear Mechanics
15. Institute of Mechanics