Results 201 - 210 of 220

• Evaluation of Several Natural Gamma Radiation Systems - a Preliminary Study
  1/1/1995 - Information Circulars
  To help evaluate the usefulness of the natural gamma radiation (NGR) technique for the coal interface detection (CID) project, the U.S. Bureau of Mines (USBM) collected data from various mining companies conducting underground and surface operations.
• A Radar-based Highwall Rib-Thickness Monitoring System
  1/1/1995 - Conference papers
  In addition to developing various types of cool-interface detection systems, the US Bureau of Mines is actively involved in developing a coal rib-thickness monitoring system for highwall mining applications. One particular system to detect the coal-air ...
• An Electromagnetic Noncontacting Sensor for Thickness Measurement in a Dispersive Media
  3/1/1994 - Conference papers
  This paper describes a general purpose imaging technology developed by the U.S. Bureau of Mines (USBM) that, when fully implemented, will solve the general problem of 'seeing into the earth.'
• In-Mine Evaluation of Smoke Detectors
  1/1/1992 - Information Circulars
  An report on the evaluation of smoke detectors placed in conveyor belt entries of underground coal mines. Recommendations for performance standards, sensitivity tests, detector classification and maintenance are also presented.
• Research Toward Direct Analysis of Quartz Dust on Filters Using FTIR Spectroscopy
  1/1/1992 - Information Circulars
  A U.S. Bureau of Mines investigation of Fourier transform infrared (FTIR) spectroscopy for on-filter analysis of respirable dust.
• 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.
• Delineation of Fractures in Igneous Rock Masses Using Common Offset Radar Reflection
  1/1/1992 - Reports of Investigations
  As part of an investigation aimed at improving the health and safety and competitiveness of the mining industry, the U.S. Bureau of Mines evaluated the application of common offset radar profiling, using a 250-MHz ground-penetrating radar (GPR) system, ...
• In-Mine Test of the Bureau of Mines Preproduction Wireless Survey System
  1/1/1990 - Reports of Investigations
  The Bureau of Mines preproduction wireless survey system (WSS) and its performance during an in-mine test are discussed in this report. The WSS was developed to reduce downhole surveying time in order to increase the efficiency of drilling long horizont...
• 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.
• Gas Content Determinations of Salt Samples Using Acoustic Responses
  1/1/1987 - Reports of Investigations
  The Bureau of Mines has developed a practical methodology for determining occluded gas contents of domal rock salt samples. The method, which is portable and fieldworthy, provides results in 5 min or less.