Yang, Ke
Fan, Xinhui
Li, Bing
Li, Yanhong
Wang, Xin
Xu, Xuanxuan
Funding for this research was provided by:
the Special Research Project for the Education Department of Shaanxi Province (14JK1351)
the President fund of Xi'an Technological University (0852-302021407)
Article History
Received: 8 April 2017
Accepted: 5 January 2018
First Online: 9 February 2018