Funding for this research was provided by:
Major basic research project of Shaanxi provincial science and Technology Department (2016ZDJC-21)
Science and Technology Bureau, Shangluo (SK2016-50)
Scientific Research Projects of Shaanxi Education Department (18JK0248)
Key projects of Shaanxi science and technology bureau (2018GY-099, S2018-YF-YBGY- 0149)
Article History
Received: 9 October 2019
Accepted: 6 February 2020
First Online: 12 February 2020