1Analysis on the quality of Chinese commercial coking coalsBAI Xiang-fei, ZHANG Yu-hong1-32Research and development of information system of coal quality inspection managementZHAO Bo, SHI Guo-qing4-73Effect of lignite modification on the concentration of coal water mixture (CWM)LIU Ye-wei, ZHANG Sheng-ju, HE Guo-feng, DUAN Qing-bing8-10,174Characteristics analysis of the coal quality of the 9# coal seam of Tiaohu exploration area in Xinjiang Santanghu coalfieldAN Qing, MA Fei-zhou11-135Discussion on the characteristics of ash yield and sulfur content of the Late Permian coal and their environmental influenceWU Kang-fu, GUO Jia-yong14-176Disscusion on verification management of the resource quantity for medium-and small-size coalminesLI Hui-qiang, MA Wei-wei, MA Wen-jing, LIU Wen-xin18-19,227Discussion on the Standardization construction of coal testing work in coal enterprisesXING Xiu-yun20-228Discussion on development and application of the coal yard inventory system existing in digital management of the coal yardAN Ke-min23-259Study on several causes of the commercial dispute related to coal shortfallCHENG Zhi-hong, ZHAN Yan26-27,3210Analysis on special sampling schemes of coalSUN Gang, MAO Guang-jian28-3211The determination of the Maximum tolerable bias value for mechanical sampling of Shenhua coalZHANG Yun-hong, ZHI Shun33-36,3912Study on the property of oxygen absorption in method for identifying tendency of coal to spontaneous combustion by oxygen absorptionXIAO Hua, WEI Zhi-quan37-3913Discussion on the influencing factors of plastometer index for the bituminous coalQI Wei40-41,4514Study on the air drying method of coal samples in coal labsLI Xing-wang, LIU Zhen-de42-4515Study on Calcium, Magnesium and Ferrum existing in coal ash using flame atomic absorption spectroscopy methodWANG Ying, SUN Hong-bin, LIU Hai-yang46-4716Analysis on the influencing factors of accurate testing of plastometer index for the bituminous coalZHAO Qin-qiang48-4917Discussion on the operation and maintenance of oxygen bombZHU Jiang50-51,5518Effect of Fe2O3 on combustion Characteristics of biomass cokeFU Ya-qing, ZHANG Jian-liang, HU Zheng-wen, ZUO Hai-bin, LIU Zheng-jian52-5519Discussion on the steam coal separation with unpressurized feeding two-stage two-product dense medium cycloneYUAN Hong-jun, ZHAO Xian-hua, HAN Xin, ZHANG Hong-ling, ZHU Zhi-hong, YU Chao-fu56-6020Application of automatic control system of TKX-Ⅲ Jigger for granular coal jigging in coal preparation plant of Xiaonan Coal MineQU De-ting, WANG Ke-xin, WANG Yan-ling61-63 