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8/1/2004 - Conference papersA new generation of hydraulic mine support prestressing devices has been developed. This paper examines the performance capabilities of these inflatable prestressing units and the impact they have on the performance of various support systems.
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12/1/2002 - Reports of InvestigationsEvaluation of the strength characteristics and air leakage resistance of numerous innovative seal designs and ventilation control structures for use in underground coal mines.
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8/1/2002 - Conference papersA high percentage of longwall shields, which provide ground control in mines, operate well below the rated support capacity due to hydraulic malfunctions. NIOSH developed a computer program to identify shields not performing to rated specifications.
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6/1/2001 - Technology NewsDescription of a passive, inexpensive technique for monitoring explosion overpressures within sealed areas in underground coal mines.
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10/1/1999 - Conference papersA Mine Safety and Health Administration-permissible load rate monitoring system was developed.
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3/1/1999 - Conference papersAccelerometers and pressure transducers mounted in suspension components can be used to monitor the ride of haulage trucks. When information from a Global Positioning System is recorded at the same time as shock pressures or acceleration date, then the...
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2/1/1999 - NIOSH/USBM numbered publicationsThe effect of wind speed upon aerosol penetration into an idealized enclosure was studied.
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8/1/1998 - Conference papersThis paper examines the operating principles of hydraulic cylinders and discusses issues pertaining to setting loads, support stiffness, yielding behavior, errors in assessing support loading, and hydraulic failure mechanisms and how to detect them.
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1/1/1993 - Reports of InvestigationsThe U.S. Bureau of Mines conducted a study to determine if commercially available automatic sprinklers could withstand the high static pressures in deep underground coal mines without leaking and if exposure to the mine environment affected their leak p...
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1/1/1985 - Reports of InvestigationsThe Bureau of Mines and United States Steel Corp. are conducting a joint project to monitor formation pressures at a large (23-well) coalbed gas drainage field near Oak Grove, Alabama. Three monitor holes were drilled in late 1981, and pressure monitori...
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Content source: National Institute for Occupational Safety and Health, Mining Program