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Results 21 - 30 of 74
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2/1/1982 - Contract reportsAn evaluation was made of one of several improved underground communication systems sponsored by the U.S. Bureau of Mines. The system was installed in a typical metal-nonmetal, room-and-pillar mine and utilized ultrahigh frequency repeaters connected to...
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2/1/1982 - Contract reportsThe objective of this project was to perform a preliminary study to determine the desirability/practicality of burying the communication cables in underground mines in order to protect then from the effects of fires and explosions. We found the overall ...
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11/1/1981 - Contract reportsA prototype detector using electromagnetic signals for finding trapped miners has previously been built and tested. The signals are generated from transmitters carried on the miner's belt and powered by his head lamp battery and the receiver is a human ...
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11/1/1981 - Contract reports, Open File ReportsAdvanced communication and monitoring systems were developed and demonstrated in three underground mines representing different mining techniques, geographical areas, and material mined.
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9/1/1981 - Contract reportsThe purpose of this project was to enhance the Bureau of Mine's Cableless Electronic Survey System use to aid in the drilling of long boreholes in coal as part of the methane drainage program. The system that was ultimately developed was field tested an...
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4/1/1981 - Contract reportsThis report presents test results, data evaluations, and typical system performance expectations based on wireless electromagnetic propagation measurements performed in the MAGMA Copper Company San Manuel mine near Tucson, Arizona during March 30 throug...
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3/1/1981 - Contract reportsThis report describes the design and implementation of UHF radio and closed-circuit television systems in the Black River room and pillar limestone mine near Butler, Pendleton County, Kentucky.
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2/1/1981 - Contract reports, Open File ReportsA survey of electromagnetic noise reports was performed and a summary of the results are given.
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1/1/1981 - Contract reportsThis report describes the results of a measurement and analysis program to characterize wireless radio transmission in metal-nonmetal mines over a wide frequency range from 0.2 to 1,000 mhz and over a variety of mine environments.
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12/1/1980 - Contract reports, Open File ReportsThe objective of this program was to design and build a self-contained system for remote monitoring of the atmosphere in mines. The system developed uses the mine pager phone line as the primary communication channel and also has the capability of using...
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Content source: National Institute for Occupational Safety and Health, Mining Program