Results 11 - 20 of 56

• The Effects of Passive Diesel Particulate Filters on Diesel Particulate Matter Concentrations in Two Underground Metal/Nonmetal Mines
  6/1/2010 - Conference papers
  In this study, NIOSH measured the atmospheric concentrations of DPM and gases in two mines in order to evaluate the effects of various control strategies on the atmospheric DPM concentrations.
• A New Method to Calculate Permeability of Gob for Air Leakage Calculations and for Improvements in Methane Control
  6/1/2010 - Conference papers
  This study demonstrates a fractal approach to calculating permeability of gob for air leakage that allows the calculation of porosity and permeability from the size distribution of broken rock material in the gob, which can be determined from image anal...
• Historical Development of Technologies for Controlling Methane in Underground Coal Mines
  1/1/2010 - Conference papers
  This paper discusses several milestone events that show the progress of methane control research in underground coal mines.
• Reservoir Engineering Considerations for Coal Seam Degasification and Methane Control in Underground Mines
  11/1/2009 - Conference papers
  This paper demonstrates the applications of coal bed reservoir engineering and modeling techniques for optimizing and controlling methane emissions in longwall and continuous miner sections.
• Modeling Methane Emissions and Ventilation Needs by Examination of Mining Induced Permeability Changes and Related Damage to Ventilation Controls
  6/1/2009 - Conference papers
  This paper aims to examine the effects of porosity and permeability changes of the coal seam on methane emissions in an underground continuous miner section.
• NIOSH Research for Monitoring and Controlling Methane at U.S. Underground Coal Mining Operations
  11/1/2008 - Conference papers
  This work by NIOSH has modelled the impacts of borehole pattern and design and the effects of increasing face length on gob gas venthole performance.
• Coal Bed Discontinuity Effects on the Production of Degasification Boreholes and on Emissions During Longwall Mining
  10/1/2008 - Conference papers
  This study presents a numerical investigation of geological discontinues in the coalbed using reservoir simulations of the effects of partings and permeability facies and lithotype changes on the production performances of vertical and horizontal degasi...
• Advances in Grid-Based Numerical Modeling Techniques for Improving Gas Management in Coal Mines
  6/1/2008 - Conference papers
  This paper summarizes the modeling efforts conducted by NIOSH in the U.S. and CSIRO in Australia to address various gas management issues encountered in longwall mines using the application of computational fluid dynamics (CFD) and numerical reservoir m...
• Effects of Sintered Metal Diesel Particulate Filter System on Diesel Aerosols and Nitric Oxides in Mine Air
  6/1/2008 - Conference papers
  This NIOSH study was conducted to establish the effects of a diesel particulate filter (DPF) system with sintered metal substrate on the concentrations and size distributions of nano and ultrafine aerosols and concentrations of nitric oxides in undergro...
• Artificial Neural Networks to Determine Ventilation Emissions and Optimum Degasification Strategies for Longwall Mines
  6/1/2008 - Conference papers
  This study proposes a principle component analysis (PCA) and artificial neural network (ANN) approach to predict the ventilation methane emission rates of U.S. longwall mines and the optimum combination of degasification boreholes based on the given cha...