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Results 121 - 130 of 270
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1/1/1992 - Reports of InvestigationsThis report is mainly about a ferrocene-based additive that reduced DPM between 4 and 45 pct, depending on engine operating conditions.
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1/1/1992 - Reports of InvestigationsThe performance of RETIMET metal foam as a flame arrester on explosion-proof enclosures was investigated by the U.S. Bureau of Mines both in laboratory tests and at the U.S. Mine Safety and Health Administration's (MSHA's) Approval and Certification Cen...
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1/1/1992 - Reports of InvestigationsResearchers monitored rock mass response to mining of an experimental underhand longwall stope in Hecla Mining Company's Lucky Friday Mine, Mullan, Idaho. This is part 2 of 3.
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1/1/1992 - Reports of InvestigationsThe Bureau of Mines conducted Cu exchange tests for six common clays under simulated in situ leaching conditions. Regression equations were obtained from the data expressing the Cu exchange capacity as a function of Cu concentration, pH, and temperature.
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1/1/1992 - Reports of InvestigationsThe Bureau of Mines tangentially impacted potential coal-cutter bit shank materials against sandstone to investigate the potential of the materials to ignite natural gas by a friction-generated hot streak.
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1/1/1992 - Reports of InvestigationsThe Bureau of Mines completed an investigation of the influence of material on the ignition probability using the breakflash apparatus. This report presents results of an investigation into the influence of disk electrode material on the probability of...
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1/1/1992 - Reports of InvestigationsThe U.S. Bureau of Mines investigated the relationship of bituminous coal seam parameters and the amount of respirable dust generated at longwalls.
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1/1/1992 - Reports of InvestigationsRoof and floor contact pressure provided by the interaction of a shield with the surrounding strata are examined. Controlled forces were applied to an 800-ton two-leg shield using a mine roof simulator.
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1/1/1992 - Reports of InvestigationsFour coreholes were drilled at a longwall mine in the Lower Kittanning coalbed to obtain coal and rock samples from overlying strata to determine their gas content during the mining cycle. Test results indicate that 91% of the gas came from coalbeds.
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1/1/1992 - Reports of InvestigationsThis U.S. Bureau of Mines report summarizes a study of large-scale strata response to longwall mining at a western U.S. coal mine. This study utilized surface and subsurface measurements, geologic mapping, in situ stress measurements, and pressure cell...
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Content source: National Institute for Occupational Safety and Health, Mining Program