1995 Vol. 21, No. 1

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Current Status in Coal Mine Automation at Home and Abroad and Countermeasures of Chinese Coal Mine Automation Development
TAN De-jian, HAO Rong, MA Li-jian, XU Shi-fa
1995, 21(1): 1-5.
<Abstract>(47)
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Based upon description of coal mine automation status at home and abroad, the author pointed out the guidance ideas and principles for automation development as well as key research direction of automation development.
Research in Optical Fibre Electrical Current Sensor and its Prospect for Mine Use
LIU Jiang
1995, 21(1): 6-8.
<Abstract>(59)
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This paper described the research of novel optical fibre electric current sensor: based on Faraday effect and the transmitted polarized light. direction varies, the magnetic field was measured and furtherly current value was detected. Meantime, its applicational propect was discussed according to real situations in coal mines.
Research in Mathematical Model and Adaptive Control Methods for Heavy Medium Density Control System
HAO Ji-fei, XU Shi-fa
1995, 21(1): 9-13.
<Abstract>(63)
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Through theoratical analysis on heavy medium density control system, the system mathematical model is deducted and computer emulation research has been carried out. An adaptive control alogrithm was put forward aiming at two main problems existing in the system.
1995, 21(1): 13-15.
<Abstract>(23)
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1995, 21(1): 16-18.
<Abstract>(34)
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1995, 21(1): 18-20.
<Abstract>(43)
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1995, 21(1): 21-24.
<Abstract>(46)
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1995, 21(1): 25-27.
<Abstract>(31)
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Methods Overcoming Dead-zone of Over-load Protection for High Voltage Motors
WANG Xin, CUI Jing-yue
1995, 21(1): 27-29.
<Abstract>(43)
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This paper pointed out dead-zone existing in over-load protection for high voltage motors. Through the analysis on dead-zone sources, two methods were offered to reduce the range of dead-zone. And also the return factor of high voltage switch componsite protection device was given.
1995, 21(1): 30-31.
<Abstract>(19)
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1995, 21(1): 32-33.
<Abstract>(21)
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1995, 21(1): 34-37.
<Abstract>(23)
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1995, 21(1): 37-39.
<Abstract>(17)
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1995, 21(1): 40-43.
<Abstract>(39)
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1995, 21(1): 43-46.
<Abstract>(46)
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Discussions on Technical Modifications of Underground Non-explosionproof Hoisting Winches
MA Shao-ming
1995, 21(1): 47-49.
<Abstract>(52)
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Several executive proposals to modify technically nonexplosionproof hoisting winches on site were put forward in accordance with the situation of our country, among which the new proposal of combined haulage of speed-regulating fluid coupler and cage explosion-proof motor was of real significance for popularization
1995, 21(1): 50-53.
<Abstract>(73)
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The Design and Application of Frequency-measurement Board of Multi-channel and High Accuracy
HE Shu-jian, YAN Jian-zhu
1995, 21(1): 53-56.
<Abstract>(24)
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Through the analysis on frequency measurement principle and design of soft and hardware, this paper systematically introduced the completion procedure of frequency-measurement board of multi-channel and high accuracy and its applications to coal mines
1995, 21(1): 57-58.
<Abstract>(30)
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1995, 21(1): 58-60.
<Abstract>(75)
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