Funding for this research was provided by:
National Natural Science Foundation of China (61602376, 61773313, 61602374, 61702411, U1334211)
National Natural Science Founds of Shaanxi (2017JQ6020, 2016JQ6041)
Key Research and Development Program of Shaanxi Province ((2015KTZDGY0104, 2017ZDXM-GY-098)
Science Technology Project of Shaanxi Education Department (16JK1573, 16JK1552)
Ph.D. Research Startup Funds of Xi'an University of Technology (112-256081504, 112-256081611)
College Research Funds of Xi'an University of Technology (112-451016007)
Received: 20 February 2019
Accepted: 3 May 2019
First Online: 27 May 2019
: The authors declare that they have no competing interests.
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