1. School of Mechanical Engineering, Shaanxi University of Technology, Hanzhong, Shaanxi 723001, China
2. Shaanxi Key Laboratory of Industrial Automation, Shaanxi University of Technology, Hanzhong, Shaanxi 723001, China
3. School of Physics and Materials Science, Nanchang University, Nanchang 330031, China
4. School of Physical Science and Technology, Southwest University, Chongqing 400715, China