1. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan, China
2. The Collaborative Innovation Center of coal safety production of Henan Province, Jiaozuo, Henan, China
3. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo, Henan, China
4. Niumag Analytical Instrument Corporation, Suzhou, Jiangsu, China