Results 41 - 50 of 129

• Remote Vision System for Dozers on Coal Stockpiles
  9/1/2007 - Conference papers
  NIOSH participated in an experiment to facilitate the remote control of dozers used on coal stockpiles. The normal sensory cues an operator requires to manipulate the dozer from a remote location were supplemented, such as with a vision system.
• The Brookwood Disaster and Electrical Requirements for Hazardous (Classified) Locations
  9/1/2007 - Conference papers
  Researchers with NIOSH studied the electrical equipment ignition sources for the Brookwood and other disasters to develop recommendations for preventing similar disasters.
• Time-Lapse Tomography of a Longwall Panel: A Comparison of Location Schemes
  7/1/2007 - Conference papers
  This paper describes a project in which three-dimensional time-lapse velocity tomograms were generated to image stress redistribution around a longwall panel to produce a better understanding of the mechanisms that lead to ground failure.
• Using Major Hazard Risk Assessment to Appraise and Manage Escapeway Instability Issues: A Case Study
  7/1/2007 - Conference papers
  Major Hazard Risk Assessment is a process that identifies the characteristics of major hazards, ranks their risk, and evaluates controls to mitigate them. This approach was used at an underground mine with fire hazard and strata instability issues.
• The Unpredictable Life Cycle of a Coal Pillar
  7/1/2007 - Conference papers
  A unique circumstance created by monitoring a pre-driven longwall recovery room permitted measuring the stresses of a coal pillar throughout its entire life cycle in less than a week. The complete transformation took place in less than 12 hours.
• Evaluation of Support and Ground Response as Longwall Face Advances into and Widens Pre-Driven Recovery Room
  7/1/2007 - Conference papers
  A cooperative study was conducted to evaluate the effectiveness of (partially) pre-driven longwall recovery rooms supported with pumpable roof supports.
• Effects of Weak Bands on Pillar Stability in Stone Mines: Field Observations and Numerical Model Assessment
  7/1/2007 - Conference papers
  Observations of pillar conditions in limestone mines showed that the presence of weak bands in the limestone can result in pillar damage. This study investigated the mechanism of failure caused by the presence of weak bands using numerical models.
• Evaluation of the Effects of Length on Strength of Slender Pillars in Limestone Mines Using Numerical Modeling
  7/1/2007 - Conference papers
  Numerical modeling is used to evaluate the degree the pillar strength is increased with a rectangular pillar over a square pillar.
• Longwall Shield Recovery Using Mobile Roof Supports
  7/1/2007 - Conference papers
  This paper addresses both the safety and the operational issues associated with mobile roof support (MRS) usage during shield recovery. It also discusses new developments, including the use of the inherently safer battery powered MRS's.
• Multiple-Seam Mining Interactions: Case Histories from the Harris No. 1 Mine
  5/1/2007 - Conference papers, Information Circulars
  A detailed evaluation of the multiple-seam experiences at Harris No. 1 Mine was done as part of NIOSH's nationwide multiple-seam mining case history database.