Funding for this research was provided by:
Shaanxi Postdoctoral research fund (2017BSHEDZZ22)
Natural Science and Technology Fund of the Shaanxi Provincial Education Department (17JK1077)
National Natural Science Fund of China (41374019, 41774025)
National Key R&D Program (2016YFB0501700, 2016YFB0501701)
Xi’an Siyuan University Natural Science Fund (XASY-B1618)
Article History
Received: 10 April 2018
Accepted: 7 July 2018
First Online: 12 July 2018