1Voltage Characteristic Curve of Sensor with Carrier of CatalystZHANG Zhigang, WANG Rulin, ZHANG Zhifeng1-32The New Type Transmission and Display System for Coal Level in Bunker on and under the GroundWU Yuliang4-53Research on Digital Controller of DC Power Charger Based on MicrocomputerWANG Xin, DU Qingnan6-84Study in Disk Braking System for Downward Belt Conveyor9-105Design of General Database in Network Management Information System for Coal Preparation PlantHE Yaqun, LIU Huaiyu11-126Research on Integrated Facility Management System in CIMS for Coal Preparation PlantGONG Dunwei, XU Shifan, HONG Dawei13-157Study on Test Bed of Hydraulic Valve15-168Main Causes Why Home-made PC Electric Control System for Mine Hoisters Has Not Achieved All-PC and the Way to Deal with the SituationLIU Chunsheng17-199Current Status of Research and Prospect for Compensation of Dynamic Reactive PowerWU Xiaojie, BAI Yue19-2210The Application of Variable-frequency Speed Regulator in Raised Shaft Drill22-2311Utilizing Fixed Loading to Increase Lift Ability24-2512The Application of Centralized and Decentralized Control System in the Production Process of Diggings Coking PlantHAO Rong, LIU Xiaoqiang, GUO Yinan, DOU Wei, WANG Suchuan, TAN Dejian, LI Cuntao, BAI Xianhe26-2813Capacitance Current of High-voltage electric network and Ground Protection in Huafeng Coal Mine29-3014Network Linking System with PLC of Series SYSMACZHANG Lin31-3215The Application of Microcomputer in Industrial Boiler Control System33-3416The Application of Cryptographic Identification Button in Automobile Security34-3517Cold-draw Technology of Thin-wall Tube36-3618Study and Analysis of the Data Exchanging Unit Used in Model KJ93 Mine Control and Monitoring System for Safety and ProductionLI Changqing, ZHU Shisong, ZHAO Jiangui37-3919Adjusting of Intermediate Frequency Power Supply and It's Fault Removing MethodsTONG Jun, YE Xinmin40-4220Several Problems in Circulating Programmable Electric Control System of AC HoistersXU Huiyong43-45 