Shandong University of Science and Technology - College of Safety and Environmental Engineering, Shandong University of Science and Technology, Shandong University of Science and Technology, Shandong University of Science and Technology, China Academy of Safety Science and Technology, Shandong University of Science and Technology, Shandong University of Science and Technology, affiliation not provided to SSRN, Shandong University of Science and Technology, Shandong University of Science and Technology and Shandong University of Science and Technology