1Numerical simulation study of top-coal loss mechanism and reasonable cycle step length for extra-thick coal seam top-coal drawingLI Dongyin, WANG Yaochuang, WANG Shen, ZHU Shiting, WANG Zuguang1-102Stress analysis of thin composite roof bolt based on continuous beamWEI Sijiang, ZHANG Sheng, ZHAI Liwei, WANG Meng, LIU Zhenshu, CHEN Kehang, CHEN Xu11-183Experimental study on water and slag transportation mechanism and high-efficiency extraction in downward boreholesZUO Weiqin, LI Yunqiang, LIU Yanwei, HAN Hongkai, JIA Haojie19-264Theoretical calculation and experimental study on the characteristics of longitudinal ultrasonic guided wave propagation in a free boltZHANG Xiaoming, LI Zhuoran, LI Zhi, YU Jiangong27-335Study on the morphological distribution features of hydraulic fractures considering underground water disaster controlLI Yakun, WANG Zhirong, HU Kai, CHEN Lingxia34-416Study on the distribution law of stress and gas in the coal mass on the side of goafWANG Di, HAN Hongkai, REN Peiliang, LIU Yanwei, ZUO Weiqin, ZHANG Shuai, SHI Can42-487Characters and genesis discussion on ferric small-balls in mantle xenoliths from Hebi kimberliteHOU Guangshun, ZHANG Yanlin, JIANG Jiang, YAN Xinjie, QI Yongan, XIANG Shihong, LI Yingjie49-548Sentinel-2A image cultivated land information extraction based on object-oriented and random forest modelZHAO Shiyi, YAN Jinfeng, DU Jiaxue55-619Spatial distribution characteristics and eutrophication assessment of nitrogen phosphorus of typical tributaries in Danjiangkou Reservoir AreaCHEN Hao, CHEN Yiyan, JIN Yingshu62-7010Study on mineral contents and crystallization characteristics of calcareous nodules in loess of Shouyang area,Shanxi ProvinceJI Chunxu, LI Yanrong71-7611Physical simulation study on the migration and deposition of fine particles in rock piles under rainfall infiltration conditionsJIANG Siyuan, XIANG Xiqiong, LI Yanrong, YANG Xinting, WANG Junyi, TAN Lili, LYU Yadong77-8612Kinematics analysis and driving stroke optimization of 3-PRS compliant parallel mechanismSUN Fuwei, YUAN Zetian, CHEN Guoqiang87-9713Gear tacho-less order tracking method with CWT-ETVF and SWT and its applicationZHAO Mengyuan, JING Shuangxi, LENG Junfa, SHENG Piao, LUO Chenxu98-10714Research on force trajectory feedback linearization sliding mode tracking control of electro hydraulic servo systemWEI Qiong, ZHOU Gang, HU Xinyu108-11315Research on parameter optimization method of electro-hydraulic actuator controller based on particle swarm algorithmHU Wanqiang, YANG Xijun, DONG Yongqiang, LI Yaohui114-11916Person re-identification based on attention mechanism and gesture recognitionZHAO Yanru, NIU Dongjie, YANG Huimeng120-12617Study on improvement of WSN node localization algorithm based on CTGO-DV-HopZHAO Qing, XU Zhen127-13318Soft measurement based on DAK-FNN for effluent ammonia nitrogenZHANG Wei, ZHANG Chunhui134-143,15919Mechanical properties and instability mode of multi-hole cement specimens strengthened by fillingXIN Yajun, DONG Shuai, JI Hongying, WANG Yu, YANG Junpeng144-15220Study on the dynamic stability of porous functionally graded conical shellHUANG Xiaolin, LIU Siqi, ZHANG Yanning, WU Di153-159 