Funding for this research was provided by:
Science and Technology Research Project of Hebei higher education (No. ZD2016042)
the Natural Science Foundation of Hebei (No. F2017208031)
the Natural Science Foundation of Nation (No. 51674096)
Article History
Received: 31 August 2017
Accepted: 13 September 2017
First Online: 30 September 2017