Results 71 - 80 of 242

• Probabilistic Modeling Using Bivariate Normal Distributions for Identification of Flow and Displacement Intervals in Longwall Overburden
  1/1/2011 - Peer reviewed journal articles
  Gob gas ventholes capture methane emissions. This study used bivariate normal distributions to determine the conditional probabilities of depth-displacement, depth-flow percentage, depth-formation, and depth-gas content of the overburden formations.
• Workplace Aerosol Measurement
  1/1/2011 - Book chapters
  While approaches to workplace aerosol measurement differ; this book chapter emphasizes the basic sampling philosophies and methods used routinely in the workplace and the application of direct-reading monitors.
• Gas and Fume Generation at the Blast Site
  1/1/2011 - Book chapters
  Gases and fumes are generated as a result of explosives detonation at a blast site. This chapter discusses only those gases produced by the detonation of commercial explosives.
• Factors Affecting Coal Particle Ignition Under Oxyfuel Combustion Atmospheres
  1/1/2011 - Peer reviewed journal articles
  Thirteen coals of different rank were tested for ignition propensity in a 20-L explosion chamber simulating oxyfuel combustion gas conditions. The effects of coal type, coal concentration, O2 in CO2 atmospheres, and particle size were investigated.
• Stochastic Modeling of Gob Gas Venthole Production Performances in Active and Completed Longwall Panels of Coal Mines
  11/1/2010 - Peer reviewed journal articles
  This paper describes a practical approach for implementing stochastic determination of gob gas ventholes production performances and for generalizing the prediction capability of deterministic models.
• MCP - Methane Control and Prediction
  9/1/2010 - PC software
  A software program that addresses some of the methane and methane control issues in longwall coal mines in the U.S. and other countries.
• Characterizing Exposures to Airborne Metals and Nanoparticle Emissions in a Refinery
  7/1/2010 - Peer reviewed journal articles
  An air quality survey was conducted at a precious metals refinery in order to evaluate worker exposures to airborne metals and to provide detailed characterization of the aerosols.
• A Handheld Electrostatic Precipitator for Sampling Airborne Particles and Nanoparticles
  6/1/2010 - Peer reviewed journal articles
  Researchers at NIOSH are developing methods for characterizing ultrafine aerosols in workplaces. One method includes the detailed analysis of collected particles using electron microscopy (EM).
• 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...