Results 571 - 580 of 618

• Thermally Induced Filter Bias in TEOM® Mass Measurement
  7/1/2007 - Peer reviewed journal articles
  Researchers at NIOSH have long used stationary tapered element oscillating microbalances (TEOMs®) in laboratory settings. They have served to assess the mass concentration of laboratory-generated particulates in experimental dust chambers and ...
• Three-Dimensional Time-Lapse Velocity Tomography of an Underground Longwall Panel
  6/1/2008 - Peer reviewed journal articles
  This paper describes the 3D velocity tomograms that were generated to image the stress redistribution around an underground coal longwall panel to produce a better understanding of the mechanisms that lead to ground failure, especially rockbursts.
• Threshold Powers and Delays for Igniting Propane and Butane-Air Mixtures by CW Laser-heated Small Particles
  11/1/2006 - Peer reviewed journal articles
  NIOSH researchers studied laser safety in potentially flammable environments. Researchers measured threshold igniting powers as a function of beam diameter for butane and propane-air mixtures by laser-heating targets placed on optical fiber tips.
• Time Domain and Frequency Domain Deterministic Channel Modeling for Tunnel/Mining Environments
  1/1/2017 - Peer reviewed journal articles
  An article that proposes two physics-based, deterministic ultra-wideband (UWB) channel models for characterizing wireless channels in mining/tunnel environments — one in the time domain and the other in the frequency domain.
• Time-Lapse Analysis of Methane Quantity in the Mary Lee Group of Coal Seams Using Filter-Based Multiple-Point Geostatistical Simulation
  8/1/2013 - Peer reviewed journal articles
  An article examining the approach of using time-lapse methods to analyze the methane degasification of a group of coal mine seams in Alabama.
• Torso Flexion Loads and Fatigue Failure Mode of Human Lumbosacral Motion Segments
  1/1/2005 - Peer reviewed journal articles
  This study's objective was to simulate the postures and loads experienced by the lumbar spine during repetitive lifting of weights in different torso flexion postures, and to analyze the fatigue failure response of lumbosacral motion segments.
• Toward a Typology of Dynamic and Hazardous Work Environments
  12/1/2001 - Peer reviewed journal articles
  The most hazardous work environments share one feature in common: constant change. A preliminary typology of dynamic and hazardous work environments, along with a schema to observe the dynamic characteristics of these hazards is proposed.
• Toward developing a new occupational exposure metric approach for characterization of diesel aerosols
  12/1/2012 - Peer reviewed journal articles
  In this study, the current exposure metric and two additional metrics, the surface area and the total number concentration, were evaluated by conducting simultaneous measurements of diesel ultrafine aerosols in a laboratory setting.
• Towards a Field-Portable Real-Time Organic and Elemental Carbon Monitor
  8/1/2019 - Peer reviewed journal articles
  A study investigating the use of mid-infrared spectrometry as a field-portable, real-time method for measuring elemental and organic carbons in diesel particulate matter aerosols.
• Training for Safety in Emergencies Inoculating for Underground Coal Mine Emergencies
  11/1/2011 - Peer reviewed journal articles
  Emergency training for miners can use inoculation theory, which explains how people can resist persuasion attempts by preparing counterarguments in advance. The theory may be used to prepare workers to react quickly by preparing responses in advance.