1. College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China
2. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China
3. Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base, Shandong University of Science and Technology, Qingdao 266590, PR China
4. Key Laboratory of Industrial Dust Prevention and Control & Occupational Health and Safety, Ministry of Education, Anhui University of Science and Technology, Huainan, Anhui 232001, PR China