Funding for this research was provided by:
National Natural Science Foundation of China (21777188)
Fundamental Research Funds for the Central Universities in China (2015QH02)
Yue Qi Young Scholar Project, China University of Mining & Technology, Beijing (2017QN15)
Article History
Received: 28 May 2020
Accepted: 19 September 2020
First Online: 26 September 2020