Results 81 - 90 of 102

• Use of Ground Penetrating Radar and Schmidt Hammer Tests to Determine the Structural Integrity of a Mine Seal
  2/1/2002 - Conference papers
  Over the years, more than 20,000 mine seals have been erected in underground coal mines in the United States. The National Institute for Occupational Safety and Health is conducting research to develop design guidelines, to investigate noninvasive tech...
• An Evaluation of Methods for Controlling Silica Dust Exposures on Roof Bolters
  2/1/2002 - Conference papers
  This paper examines methods for limiting occupational silica exposures for roof bolting personnel in underground coal mining. It also evaluates a metal rake, a flexible insert, and a rigid insert for cleaning the roof bolter dust collector box.
• NIOSH Ventilation Research Addressing Diesel Emissions and Other Air Quality Issues in Nonmetal Mines
  2/1/2002 - Conference papers
  Discusses current NIOSH research to improve mine ventilation and mine air quality, particularly for large opening mines.
• Laboratory Evaluation of a Canopy Air Curtain for Controlling Occupational Exposures of Roof Bolters
  6/1/2001 - Conference papers
  Testing at NIOSH assessed the effectiveness of a canopy air curtain for controlling occupational exposures to respirable silica and coal dusts.
• Effects of Water Sprays and Scrubber Exhaust on Face Methane Concentrations
  6/1/2001 - Conference papers
  Research to determine how machine-mounted water sprays and a scrubber interact to reduce methane levels and what spray configurations provide the best face ventilation when used with a scrubber.
• Effects of Water Sprays Used With a Machine-Mounted Scrubber on Face Methane Concentrations
  2/1/2001 - Conference papers
  Past studies with blowing face ventilation systems have shown that using a machine-mounted scrubber and water sprays can reduced methane levels at the face.
• Evaluation of New Methods and Facilities to Test Explosion-Resistant Seals
  1/1/2001 - Conference papers
  This paper provides a brief overview of the ongoing study to evaluate the use of these chambers for pressure loading of full-scale seal designs using compressed air, water, or internal gas explosions.
• Using Water Sprays to Improve Performance of a Flooded-Bed Dust Scrubber
  7/1/2000 - Peer reviewed journal articles
  Supplemental water sprays were placed along the sides of a continuous mining machine to improve suppression and confinement of the dust cloud under the cutting boom to reduce downwind dust levels. Using a full-scale mock-up of a continuous mining machi...
• Experimental Mine and Laboratory Dust Explosion Research at NIOSH
  5/1/2000 - Peer reviewed journal articles
  Explosion characteristics such as the minimum explosible concentration and the rock dust inerting requirements were measured for various combustible dusts. The explosion resistance characteristics of seals was also evaluated.
• Detection of A-C Machine Winding Deterioration Using Electrically Excited Vibrations
  10/1/1999 - Conference papers
  Presented in this paper is a theoretical review of the relationships that should exist between electrical winding parameters and the mechanical vibration of a-c machine elements under normal and faulted operating conditions.