**Author details**

Tinghai Cheng1,2\* and Jianping Li3

1 School of Mechatronic Engineering, Changchun University of Technology, Changchun, China

2 Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, China

3 Key Laboratory of Intelligent Operation and Maintenance Technology and Equipment for Urban Rail Transit of Zhejiang Province, College of Engineering, Zhejiang Normal University, Jinhua, China

\*Address all correspondence to: chengtinghai@binn.cas.cn

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