- Correspondence to Mr Susu Liu, School of Mechanical Engineering, Nantong University, Nantong 226019,China ; and Professor C Xu, School of Mechanical Engineering Nanjing University of Science and Technology Nanjing China ;
- Received 8 September 2017
- Revision received 15 November 2017
- Accepted 19 November 2017
- Published in print 21 December 2017.
- Published online 25 December 2017.
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