Funding for this research was provided by:
National Natural Science Foundation of China (41031064)
National Natural Science Foundation of China (61572384, 61432014)
China’s postdoctoral fund first-class funding (2014M560752)
the central university basic scientific research business fee (JBG150225)
Shanxi province postdoctoral science fund
Shaanxi Key Technologies Research Program (2017KW-017)
Article History
Received: 16 May 2018
Accepted: 6 August 2018
First Online: 20 August 2018