Funding for this research was provided by:
the National Natural Science Fund of China (11502229)
the Natural Science Foundation of Jiangsu Province of China (BK20160433)
the Program of Outstanding Young Scholars in Yancheng Institute of Technology (2014)
the Program of Yellow Sea Elite in Yancheng Institute of Technology (2019)
the opening fund of Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education (JYBSYS2019207)
the Program of Yellow Sea Team in Yancheng Institute of Technology (2019)
Article History
Received: 2 May 2019
Accepted: 30 April 2020
First Online: 26 May 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.