Funding for this research was provided by:
Special Fund Project of Education Department in Shaanxi Province of China (17JK0086)
National Natural Science Foundation of China (51608412)
natural Science Basic Research Plan in Shaanxi Province of China (2016JQ2034)
Scientific Research Fund of Shaanxi University of Science and Technology (2016BJ-48)
the Science and Technology Department Foundation of Shaanxi Province (2016GY-199)
Article History
Received: 31 October 2018
Revised: 1 January 2019
Accepted: 22 January 2019
First Online: 2 February 2019