Results 381 - 390 of 618

• Hydraulic Conductivity Changes and Influencing Factors in Longwall Overburden Determined by Slug Tests in Gob Gas Ventholes
  10/1/2009 - Peer reviewed journal articles
  This study presents the results of core-log analyses from the exploration boreholes, the analyses of face advance rates, and the results of downhole monitoring studies performed in gob gas ventholes.
• Do Light-Emitting Diode Cap Lamps Enable Improvements in Miner Safety?
  10/1/2009 - Peer reviewed journal articles
  The objective of the research described in this paper was to determine if light-emitting diodes (LEDs) improve visual performance as compared to traditional incandescent (INC) cap lamps.
• Improvements in Seismic Event Locations in a Deep Western U.S. Coal Mine Using Tomographic Velocity Models and an Evolutionary Search Algorithm
  9/1/2009 - Peer reviewed journal articles
  Methods of improving seismic event locations were investigated as part of a research study aimed at reducing ground control safety hazards. Results obtained using different velocity models are compared.
• A Dual Sprocket Chain as a Noise Control for a Continuous Mining Machine
  9/1/2009 - Peer reviewed journal articles
  A dual sprocket conveyor chain for a CMM was examined both in the laboratory and in underground field studies to test the influence on lowering the sound power emissions of the chain conveyor of a CMM when compared to a standard chain.
• How Does Limestone Rock Dust Prevent Coal Dust Explosions in Coal Mines?
  9/1/2009 - Peer reviewed journal articles
  This study investigates how limestone rock dust prevents the propagation of coal dust explosions by assessing its changes in chemical composition.
• High Resolution Seismic Refraction Tomography for Determining Depth of Blast Induced Damage in a Mine Wall
  8/1/2009 - Peer reviewed journal articles
  High resolution seismic refraction tomography has proved to be a useful tool to effectively estimate depth of blast induced damage in a mine face.
• A Hydrodynamics-Based Approach for Predicting the Blast Damage Zone in Drifting as Demonstrated Using Concrete Block Data
  8/1/2009 - Peer reviewed journal articles
  This paper presents a blast design technique based on a hydrodynamic method and introduces modifications to account for different explosives from those used in a calibration test.
• Frictional Ignitions in Underground Bituminous Coal Operations 1983-2005
  8/1/2009 - Peer reviewed journal articles
  NIOSH conducted a statistical study of available data regarding frictional ignitions in the United States from 1983 to 2005 to determine and define conditions controlling their occurrence.
• Noise Source Identification on a Horizontal Vibrating Screen
  7/1/2009 - Peer reviewed journal articles
  This paper presents the results of a NIOSH study in collaboration with Acoustical and Vibrations Engineering Consultants Inc. (AVEC) to determine the dominant noise sources on a vibrating screen machine at low frequencies, i.e., 250 to 1,000 Hz.
• Chemical-Related Injuries and Illnesses in U.S. Mining
  7/1/2009 - Peer reviewed journal articles
  The purpose of this study was to determine if miners were at risk from exposures to chemicals used in the mining industry and determine the nature and sources of the illnesses and injuries.