Institution: | 1. University of Kentucky Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY 40511, USA;2. Department of Earth and Space Sciences, Morehead State University, Morehead, KY 40351, USA;3. Chemical and Metallurgical Engineering University of the Witwatersrand, Johannesburg, South Africa;4. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China |