Funding for this research was provided by:
National Natural Science Foundation of China (11971277, 11971140)
the Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi
the Scientific Innovation Foundation of the Higher Education Institutions of Shanxi Province (2019KJ034)
Article History
Received: 24 March 2020
Accepted: 24 July 2020
First Online: 24 August 2020