Funding for this research was provided by:
National Natural Science Foundation of China (11871398)
the Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2018JM1032)
the Fundamental Research Funds for the Central Universities (3102019ghjd003)
the Innovation and Creation for Graduate Students in Northwestern Polytechnical University (ZZ2019031)
Article History
Accepted: 19 January 2021
First Online: 8 February 2021