Funding for this research was provided by:
The Science Fund for Distinguished Young Scholars from Shaanxi province (2018-JC007)
The Fundamental Research Funds for the Central Universities
The Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University (CX201907)
Article History
Received: 17 August 2019
Accepted: 28 November 2019
First Online: 6 December 2019