Funding for this research was provided by:
the State Key Research Development Program of China (2016YFC0801402, 2016YFC0600708)
National Natural Science Foundation of China (51874314)
the Open Funds of Hebei State Key Laboratory of Mine Disaster Prevention (KJZH2017K02)
the Joint Fund Project of Guizhou Science and Technology Department and Bijie Science and Technology Bureau and Institute of Circular Economy (LH[2017]7520)
the Guizhou Science and Technology Support Program ([2017]2820)
Chinese Government Scholarship
Article History
Received: 1 January 2019
Accepted: 31 August 2019
First Online: 4 September 2019
Compliance with Ethical Standards
:
: All the authors declare that they have no conflict of interest.