Results 61 - 70 of 270

• Evaluation of Reinforced Cementitious Seals
  8/1/1999 - Reports of Investigations
  NIOSH cooperated with Tecrete Industries Pty. Ltd. and BHP Australia Coal to evaluate the strength characteristics and air leakage of four seal and two stopping designs for use in underground coal mines.
• Investigation of Coal Properties and Airborne Respirable Dust Generation
  10/1/1998 - Reports of Investigations
  Laboratory testing and results are presented where five bituminous coals were prepared and processed through a double roll crusher located in a low-velocity wind tunnel. The results indicate that a combination of several factors are associated with air...
• Concluding Evaluation of a Continuous Haulage Guidance Sensor
  10/1/1998 - Reports of Investigations
  One of the applications of enabling technology for remote-controlled mining to protect miners is the use of a guidance system on the continuous haulage equipment so that it follows the continuous mining machine that extracts the coal.
• Model for the Structure of Round-Strand Wire Ropes
  9/1/1998 - Reports of Investigations
  The behavior of wire ropes used in hoisting is not well understood. In an effort to improve this understanding, the structure of round-strand wire ropes was analyzed. This report provides a generalized mathematical model that completely describes the g...
• Full-Scale Testing of the Float Dust Deposition Meter
  5/1/1998 - Reports of Investigations
  Full-scale testing and results are described for an automated system that continuously monitors the accumulation of coal dust in mine entries.
• Accurate Navigation and Control of Continuous Mining Machines for Coal Mining
  11/1/1997 - Reports of Investigations
  The results of laboratory, field, and open pit accuracy and performance testing of the Honeywell Ring Laser Gyro Inertial Navigation System, a navigation system designed to provide the heading and location of a remote controlled miner, are presented.
• Detection of Downed Trolley Lines Using Arc Signature Analysis
  5/1/1997 - Reports of Investigations
  The article discusses the applicability of computerized signal analysis techniques to identify fault currents existing on coal mine direct-current trolley systems
• A Second-Generation Remote Optical Methanometer
  5/1/1997 - Reports of Investigations
  As the use of deep-cut mining increases, there is expected to be a greater demand for methane measurement devices capable of scanning working faces at depths in excess of 10 m to alert mine personnel of hazardous concentrations of methane and to satisfy...
• Evaluation of a Signaling and Warning System for Underground Mines
  5/1/1997 - Reports of Investigations
  A report evaluating a wireless signaling and warning system for underground mines applicable to both coal and non-coal mines. A TeleMagnetic Signalling Systems wireless ultra-low-frequency electromagnetic signaling system was installed and tested.
• Development of a Mine Hoist and Ore Pass Research Facility
  2/1/1997 - Reports of Investigations
  A Report of Investigations detailing research aimed at preventing injuries and fatalities related to vertical movement of personnel and materials in mine shafts and ore passes.