Funding for this research was provided by:
Major Innovation Projects for Building First-class Universities in China’s Western Region (ZKZD2017006)
National Natural Science Foundation of China (12062023)
Ningxia Hui Autonomous Region Key Research and Development Project (2020BEB04015)
Article History
Received: 7 May 2020
Accepted: 9 February 2021
First Online: 17 March 2021