Funding for this research was provided by:
Ningxia Natural Science Foundation of China (Grant No. 2018AAC03031)
Basic Scientific Fund of Ningxia university (Grant No. NGY2018009)
Natural Science Foundation of Ningxia University (Grant No. ZR1702)
Article History
Received: 8 May 2019
Revised: 18 August 2019
Accepted: 16 March 2020
First Online: 18 April 2020