Results 121 - 130 of 270

• Effectiveness of Iron-Based Fuel Additives for Diesel Soot Control
  1/1/1992 - Reports of Investigations
  This report is mainly about a ferrocene-based additive that reduced DPM between 4 and 45 pct, depending on engine operating conditions.
• Performance of RETIMET Metal Foam Vents on Explosion-Proof Enclosures
  1/1/1992 - Reports of Investigations
  The 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...
• Rock Mechanics Investigations at the Lucky Friday Mine (In Three Parts): 2. Evaluation of Underhand Backfill Practice for Rock Burst Control
  1/1/1992 - Reports of Investigations
  Researchers 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.
• Copper Exchange Capacity of Clays and Their Potential Effect on In Situ Copper Leaching
  1/1/1992 - Reports of Investigations
  The 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.
• Frictional Ignition of Natural Gas-Air Mixtures by Alternative Coal-Cutter Bit Shank Materials
  1/1/1992 - Reports of Investigations
  The 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.
• Influence of Electrode Material on Spark Ignition Probability
  1/1/1992 - Reports of Investigations
  The 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...
• Relationship of Coal Seam Parameters and Airborne Respirable Dust at Longwalls
  1/1/1992 - Reports of Investigations
  The U.S. Bureau of Mines investigated the relationship of bituminous coal seam parameters and the amount of respirable dust generated at longwalls.
• Canopy and Base Load Distribution on a Longwall Shield
  1/1/1992 - Reports of Investigations
  Roof 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.
• Determining the Source of Longwall Gob Gas: Lower Kittanning Coalbed, Cambria County, PA
  1/1/1992 - Reports of Investigations
  Four 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.
• Large-Scale Strata Response to Longwall Mining: A Case Study
  1/1/1992 - Reports of Investigations
  This 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...