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Results 181 - 190 of 195
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1/1/1986 - Reports of InvestigationsA joint effort by the Bureau of Mines and the Mine Safety and Health Administration, U.S. Department of Labor, was undertaken to determine how well self-contained self-rescuers (SCSR's), deployed in accordance with Federal Regulations (30 CFR 75.1714), ...
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7/1/1985 - Open File ReportsEfforts to produce electromagnetic systems for the location of trapped miners underground and to communicate with them were surveyed, from the 1920s to 1981. Theoretical studies of through-the-earth electromagnetic transmissions are described as well as...
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2/1/1984 - Contract reportsAn electromagnetic (EM) system for the location of trapped mine workers at coal-mine (300 m) depths has been developed.
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1/1/1984 - Reports of InvestigationsA short-range locator system capable of locating trapped miners has been devised. The system consists of a light-weight, low-power radio transmitter incorporated into a miners cap lamp battery and a directional receiver carried by rescuers.
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1/1/1983 - Reports of InvestigationsAn essential element of the USBM electromagnetic location and communication system for trapped miners is knowledge of the surface and above-surface electromagnetic fields created by an underground transmitter.
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1/1/1982 - Reports of InvestigationsThe Bureau of Mines (NIOSH Mining) has conducted field studies in coal mines throughout the United States to determine the effectiveness of electromagnetic techniques in locating miners trapped underground following a mine accident.
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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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7/1/1980 - Contract reportsThis report assesses the expected detectability, on the surface above mines, of electromagnetic signals produced in the 630- to 3,030-hz frequency band by a rescue transmitter activated by miners trapped underground. The implications of the results and ...
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1/1/1976 - Reports of InvestigationsThe theory of electromagnetic fields indicates such fields could be used to detect and locate trapped miners. To be useful, the hardware of the system must meet a number of requirements, including small size, intrinsic safety, and rugged construction. S...
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11/1/1974 - Contract reportsThe report describes the design and building of 15 mancarried and 5 helicopter receivers that are used for trapped miner location during a mine disaster. Helicopters are equipped with six-channel receivers and used to detect transmitters carried by mine...
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Content source: National Institute for Occupational Safety and Health, Mining Program