Results 211 - 220 of 646

• 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.
• Effect of Coal Type and Oxyfuel Combustion Parameters on Pulverised Fuel Ignition
  8/1/2007 - Conference papers
  This paper describes ignition tests on pulverised coal suspensions using a suite of coals of different rank and from different countries of origin and over a range of oxygen and coal concentrations of interest for oxyfuel combustion.
• Improving the Capability for Real Time Assessment of Roof Conditions Through Intelligent Roof Bolt Drilling Operations
  7/1/2007 - Conference papers
  An intelligent drilling system has been developed that can complement scoping and core analysis to provide a more complete picture of roof strata and is capable of seeing features or conditions that are not always obvious in more traditional methods.
• 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.
• Roof Screening for Underground Coal Mines: Recent Developments
  7/1/2007 - Conference papers
  This paper describes some successful techniques and machine modifications that were evaluated for ergonomic considerations and are being used in productive mines to assist with roof screen installation.
• 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.