Results 71 - 80 of 618

• Distinguishing Motor Starts from Short Circuits through Phase-Angle Measurements
  1/1/2002 - Peer reviewed journal articles
  NIOSH investigated how the starting of induction motors may cause nuisance tripping of short-circuit protection on coal mine power systems.
• Using the Coal Mine Roof Rating (CMRR) to Assess Roof Stability in U.S. Coal Mines
  8/1/2001 - Peer reviewed journal articles
  The CMRR quantifies defects in the rock mass and compiles a strength value used for engineering design. The CMRR has been applied to a number of ground stability problems. The CMRR procedure and some of these applications are described in this paper.
• Roof Monitoring Helps Prevent Injuries in Stone Mines
  11/1/2000 - Peer reviewed journal articles
  The Roof Monitoring Safety System (RMSS) is described, compared to other roof-monitoring technology, and described in context with proactive ground control plans for stone mines.
• Ignition of Methane-Air Mixtures by Laser Heated Small Particles
  5/1/2000 - Peer reviewed journal articles
  Optical technologies have progressed rapidly in the past 15 years. NIOSH is conducting a study to help provide a scientific basis for developing appropriate safety guidelines for optical equipment in underground coal mines.
• Predicting System Interactions in the Design Process
  9/1/1999 - Peer reviewed journal articles
  Almost every process has a predecessor, and studying the predecessor helps to define needs and shortcomings to be addressed. This paper illustrates how such an approach was used to assess remote machine operation in underground coal mines.
• Application of the Coal Mine Roof Rating (CMRR) to Extended Cuts
  4/1/1999 - Peer reviewed journal articles
  The Coal Mine Roof Rating (CMRR) has been widely accepted as a tool for geologic characterization and mine planning. The application of the CMRR to extended cuts (cuts greater that 6 m (20 ft) in length) is discussed.
• Distributed Measurement of Conductor Temperatures in Mine Trailing Cables Using Fiber-Optic Technology
  3/1/1998 - Peer reviewed journal articles
  Mine trailing cables operated above safe thermal limits can cause premature insulation failure, increasing electrocution and fire hazards. This paper describes an approach to measuring temperatures within reeled cable under dynamic test conditions.
• Horizontal Stress and Longwall Headgate Ground Control
  1/1/1998 - Peer reviewed journal articles
  Horizontal stresses are caused by global plate-tectonic forces. This paper presents six case histories of mines that encountered roof falls or difficult ground conditions at the headgate caused by horizontal-stress concentrations.
• Coal Dust Explosibility
  1/1/1996 - Peer reviewed journal articles
  This paper reports US Bureau of Mines (USBM) research on the explosibility of coal dusts. The purpose of this work is to improve safety in mining and other industries that process or use coal.
• A Human Component to Consider in Your Emergency Management Plans: The Critical Incident Stress Factor
  7/1/1995 - Peer reviewed journal articles
  In recent years the issue of human stress response in emergency workers has begun to receive attention. This paper presents a rationale for considering human stress as a significant factor in the management of emergencies. It discusses the concept of st...