Funding for this research was provided by:
National Natural Science Foundation of China (51574246)
National Key Research and Development Project (2017YFC0804201)
the Yue Qi Distinguished Scholar Project, China University of Mining & Technology, Beijing (800015Z1138)
the Fundamental Research Funds for the Central Universities (2011QZ01)
Article History
Received: 24 March 2018
Accepted: 5 July 2019
First Online: 30 August 2019