1Research to the mine in the 21st century: digital mineWU Li-xin, YIN Zuo-ru, DENG Zhi-yi, QI An-wen, YANG Ke-ming337-3422Extraction technology test and design in fully comprehensive caving mechanized face with output of 4 million tons per yearWU Shi-liang, XI Jing-de, ZHANG Kai-zhi, JIANG Jin-quan, LI Zheng-long, MENG Xiang-jun, LI Zhi-wei, QIN Le-yao343-3473Quantitative study and classification standards of difficult mining coal seamMENG Xian-rui, XU Yong-yong, LIU Huan-yu348-3514The characteristics of top-coal deformation and smash with sub-level caving miningLI Hua-min, ZHOU Ying, ZHAI Xin-xian352-3555Study of calculation method for discontinuous surface deformation induced by steeply-inclined seam miningDAI Hua-yang, WANG Jing-zhuang, TENG Yong-hai, TANG Zhi-xin356-3606The feasibility research of mining damage controlling by goaf cement backfill in coal minesYNAG Bao-gui, CUI Xi-min, SUN Heng-hu, KONG Ling-biao, KONG Xiang-yi361-3657Endurance research on high-property sprayed concreteFAN Wen-xi, ZHANG Chang-hai, ZHENG Yong-bao366-3688Mechanical analysis on the man-made flexible protecting device in shaftSAI Yun-xiu369-3739Study on the controlled perimeter blasting for drift in soft rockDAI Jun, YANG Yong-qi374-37810A solution to the first-order and second-order simultaneous design for the nonlinear monitoring networkTao Hua-xue, Li Gui-ling379-38211Comprehensive evaluation of the stability of gyrotheodoliteLIU Xiao-sheng, LI Man-miao, FAN Jun-zhi383-38612Determination and calculation of oxidation heat liberation intensity of loose coal at low temperature stageXU Jing-cai, WEN Hu, GE Ling-mei, ZHANG Xin-hai, DENG Jun387-39013Numerical simulation and experimental study of gas transport in the upper corner of mining face under pulsed ventilationWANG Kai, YU Qi-xiang, YANG Sheng-qiang, ZHANG Ren-gui391-39614Multi-objective fuzzy optimization model based on fuzzy entropy and its applicationXU Kai-li, CHEN Bao-zhi, CHEN Quan, WU Huai-ren397-40015The theoretical analysis of the influencing factors about temperature change in the process of coal and gas outburstGUO Li-wen, JIANG Cheng-lin401-40316Determination of extinction coefficient of dustWang Zi-liang404-40717Forming mechanism and prevention of water-coal-burst disaster on extremely inclined faces under Ordovician aquiferWU Qiang, QIAN Zeng-jiang, DONG Dong-lin, SONG En-chun, HONG Yi-qing408-41118Experimental study at the exit flow field of an axial flow fan with variable setting angleCHEN Hai-sheng, LIANG Xi-zhi, TAN Chun-qing, KANG Shun412-41519Characterization of UHF radio propagation channels in a long wall face of a coal mineZHANG Yue-ping, ZHANG Wen-mei, SHENG Jian-huan, ZHENG Guo-xin416-41920Effect of constant current cource supply on the electromagnetic force of permanent magnet linear synchronous motor for vertical movementJIAO Liu-cheng, YUAN Shi-ying420-422 