Ruoyan, Wei
Xiaogang, Ruan
Naigong, Yu
Xiaoqing, Zhu
Jia, Lin
Funding for this research was provided by:
National Basic Research Program of Chin (2012CB720000)
Colleges and Universities in Hebei Province Science and Technology Research Project (QN2016223)
2016 Hebei University of Economics and Business, Dr. Scientific Research Fund (0112160171)
2016 Hebei University of Economics and Business, Research Fund (2016KYQ01)
Article History
Received: 1 July 2015
Accepted: 19 December 2016
First Online: 29 December 2016
Free to read: This content has been made available to all.