Results 21 - 30 of 34

• Bending Fatigue Tests 2 and 3 on 2-Inch 6x25 Fiber Core Wire Rope
  1/1/1992 - Reports of Investigations
  The U.S. Bureau of Mines established a wire rope research laboratory to examine the factors that affect the life of wire rope. The tests indicated that once a wire rope nears the end of its service life, both deterioration and the consequent loss of ro...
• Cause of Floor Self-Heatings in an Underground Coal Mine
  1/1/1992 - Reports of Investigations
  This report presents a Bureau of Mines study to identify the causes of self-heating events beneath the floor of a deep underground coal mine. The combined results led to the conclusion that pyrite oxidation was the prime cause of the heatings.
• Accuracy and Precision of Microseismic Event Locations in Rock Burst Research Studies
  1/1/1992 - Reports of Investigations
  Stability analyses of fractured and faulted rock masses require delineation of the position, extent, and orientation of geologic discontinuities. Recommendations are made for increasing the accuracy of locations of microseismic events detected.
• Transfer of Self-Contained Self-Rescuer Donning Skills Under Similar Conditions of Practice: The Draeger OXY-SR60B and the CSE SR-100
  1/1/1992 - Reports of Investigations
  The purpose of this U.S. Bureau of Mines study was to assess the ability of trainees to don an unfamiliar self-contained self-rescuer (SCSR) after having become familiar with how to put on a different type of apparatus.
• Self-Contained Self-Rescuer Donning Proficiency at Eight Eastern Underground Coal Mines
  1/1/1991 - Reports of Investigations
  This report presents the procedures used and findings from a U.S. Bureau of Mines evaluation of the self-contained self-rescuer (SCSR) donning proficiency of 243 miners at eight Eastern underground coal mines.
• Rapid (Grab) Sampling During Full-scale Explosions - Microscopic and Analytical Evaluation
  1/1/1988 - Reports of Investigations
  The Bureau of Mines has developed a system using a high-speed electropneumatic mechanism for the rapid (grab) sampling of dusts and gases during an explosion to monitor pyrolysis-charring in coal particles and combustion of pyrolysis vapors.
• Evaluation of the Seismic System for Locating Trapped Miners
  11/1/1981 - Reports of Investigations
  This report discusses the configuration and system deployment for the postdisaster surface seismic system for detecting and locating trapped miners.
• Gas-Sampling Capability of Vacutainers
  1/1/1978 - Reports of Investigations
  Tests were conducted to study shelf life of evacuated vacutainer samplers prior to sampling and also to check the stability of sampled gases prior to analysis.
• Improved Methods for Monitoring Production From Vertical Degasification Wells
  1/1/1978 - Reports of Investigations
  In this Bureau of Mines investigation, production was monitored for 1 year at over 30 coalbed gas-drainage boreholes located in Alabama, Pennsylvania, and West Virginia.
• Seismic Detection of Trapped Miners Using In-Mine Geophones
  1/1/1976 - Reports of Investigations
  A seismic system which utilizes in-mine geophones to detect trapped miners has been developed. Tests at the Bureau of Mines safety research mine at Bruceton, Pennsylvania, and at two operating mines indicate such a system has a maximum detection range i...