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5/1/1997 - Reports of InvestigationsThe article discusses the applicability of computerized signal analysis techniques to identify fault currents existing on coal mine direct-current trolley systems
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1/1/1987 - Reports of InvestigationsGob holes are routinely used by the mining industry to vent methane from gobs and to prevent it from entering the mine ventilation system. In some cases, flows from gob holes are measured by centering an anemometer on the end of a discharge pipe. These ...
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1/1/1976 - Reports of InvestigationsCoalbeds exhibit a directional permeability, with the maximum permeability oriented parallel to the face cleat. Thus, the most efficient pattern of vertical degasification holes for a coalbed is dependent upon cleat orientation. Analysis of surface joi...
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1/1/1972 - Reports of InvestigationsA sorption apparatus for measuring the equilibrium sorption isotherm and the rate of diffusion of methane from fine-sized coal was designed and constructed. Preliminary work that used Pittsburgh and Pocahontas No. 3 Coal shows that the diffusion coeffic...
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Content source: National Institute for Occupational Safety and Health, Mining Program