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Results 71 - 80 of 242
Probabilistic Modeling Using Bivariate Normal Distributions for Identification of Flow and Displacement Intervals in Longwall Overburden1/1/2011 - Peer reviewed journal articlesGob 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.
1/1/2011 - Book chaptersWhile 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.
1/1/2011 - Book chaptersGases 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.
1/1/2011 - Peer reviewed journal articlesThirteen 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 Mines11/1/2010 - Peer reviewed journal articlesThis paper describes a practical approach for implementing stochastic determination of gob gas ventholes production performances and for generalizing the prediction capability of deterministic models.
9/1/2010 - PC softwareA software program that addresses some of the methane and methane control issues in longwall coal mines in the U.S. and other countries.
7/1/2010 - Peer reviewed journal articlesAn 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.
6/1/2010 - Peer reviewed journal articlesResearchers 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 Mines6/1/2010 - Conference papersIn 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 Control6/1/2010 - Conference papersThis 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...