1. School of Mines, China University of Mining & Technology, Xuzhou, China
2. Department of Civil Engineering, Lakehead University, Thunder Bay, Ontario, Canada
3. Department of Energy Engineering, Shanxi Institute of Science and Technology, Jincheng, Shanxi, China
4. School of Engineering, Faculty of Science, Engineering and Built Environment, Deakin University Gee-long Waurn Ponds Campus, Geelong, Victoria, Australia