Funding for this research was provided by:
The Chinese 13th Five-Year Key Research and Development Program (2016YFC0501102, 2017YFC0804103)
China Coal Technology and Engineering Group Co., Ltd. Technology Innovation Fund (2013ZD002-02)
Article History
Received: 10 October 2017
Accepted: 11 June 2018
First Online: 16 June 2018