Results 141 - 150 of 220

• Damage Delineation in Structures Using Laser Vibrometry and Remote Excitation
  6/1/2004 - Conference papers
  As part of a research program to reduce injuries and fatalities in the U.S. mining workforce, NIOSH is investigating the potential use of noncontact vibration measurements to identify hazardous ground fall conditions.
• Performance of a New Personal Respirable Dust Monitor for Mine Use
  6/1/2004 - Reports of Investigations
  A personal dust monitor (PDM) was developed to measure respirable coal mine dust mass to provide accurate exposure data at the end of a work shift.
• Real-time Neural Network Application to Mine Fire - Nuisance Emissions Discrimination
  5/1/2004 - Conference papers
  Discusses implementation of a real-time neural network which can discriminate mine fires from nuisance diesel emissions as part of an atmospheric mine monitoring system in NIOSH's Safety Research Coal Mine.
• Use of a Test Box to Measure Response Times for Machine-Mounted Monitors
  5/1/2004 - Conference papers
  This study describes how response times of machine-mounted methane monitors were measured by placing the methane sensor heads in a specially designed box where they were exposed to an atmosphere containing a constant concentration of methane.
• Evaluating Factors Affecting the Performance of Three-Axis Ultrasonic Anemometers
  5/1/2004 - Conference papers
  Provides guidelines for more effective use of the ultrasonic anemometer.
• Evaluation of Instrumented Cable Bolts in Cement Grout to Determine Physical and Numerical Modeling Properties
  4/1/2004 - Reports of Investigations
  NIOSH researchers at the Spokane Research Laboratory in Spokane, WA, are investigating the physical properties of cable bolts by replacing the conventional king wire with a modified king wire on which strain gauges have been installed.
• Measurement of Airflow in a Simulated Underground Mine Environment Using an Ultrasonic Anemometer
  1/1/2004 - Peer reviewed journal articles
  Reports on a test system and computer program developed for using a three-axis ultrasonic anemometer to measure airflow in a simulated mine entry.
• Multiple Type Discriminating Mine Fire Sensors
  12/1/2003 - Peer reviewed journal articles
  Researchers determined that different types of fire sensors could distinguish mine fires from nuisance emissions produced by diesel equipment. A neural network was developed for coal, wood, & conveyor belt fires in the presence of diesel emissions.
• Evaluation of IYONI II Methanometers
  10/1/2003 - Conference papers
  Report on a series of performance tests conducted on the IYONI II methanometer. Testing methods included use of a calibration fixture, an environmental test box and a full scale test gallery.
• Determination of In Situ Deformation Modulus for Cemented Rockfill
  9/1/2003 - Conference papers
  As part of safety and stability studies at three underground mines in the United States, researchers installed earth pressure cells and embedment strain gauges in cemented rockfill to measure stress and strain changes as mining progressed and the rockfi...