Funding for this research was provided by:
National Science and Technology Major Project (2016ZX05067001-007)
Shanxi Science and Technology Major Project (20181101013)
Special Fund for Fundamental Research Fee in China University of Geosciences (CUGL180828)
Article History
Received: 3 May 2019
Accepted: 7 January 2020
First Online: 23 January 2020
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.