Funding for this research was provided by:
the Fundamental Research Funds for Henan Province Colleges and Universities (NSFRF140120)
Henan Province Science and Technology Key Project (202102210081, 202102210082)
the Doctor Foundation of Henan Polytechnic University (B2012-101)
Article History
Received: 6 July 2019
Revised: 22 February 2020
Accepted: 18 March 2020
First Online: 9 April 2020
Competing Interests
: The authors declare no competing financial interests.