- Diseases and injuries
- Equipment, tools, and parts
- Geographic regions
- Hazard prevention and control
- Hazards and exposures
- Mine locations, excavations, and structures
- Mining types and methods
- Population groups
- Products and materials
- Research disciplines
- Research methods and measures
- Tasks and activities
- Document types
Results 81 - 90 of 95
Experience with an Integrated, Computer-Controlled Communications and Monitoring System at the Robena Mine8/1/1976 - Conference papersA whole mine, computer-controlled communication and monitoring system for both normal and emergency use is installed and operating in the U.S. Steel Robena Mine complex near Uniontown, Pa. Experience with the system is reviewed.
Technical Services for Mine Communications Research: Task A, Task Order No. 1 - Applicability of State-Of-The-Art Voice Bandwidth Compression Techniques for Wireless Mine Communication7/1/1975 - Contract reportsThe applicability of voice bandwidth compression techniques to mine wireless communication systems is examined. Promise has been attached to such techniques because the lessened bandwidth gave hope for lessened received noise and hence increased operati...
4/1/1975 - Contract reportsThe pager phones used in many underground coal mines are battery-operated, party-line telephones with provisions for loudspeaker paging. The system is two-wire, non-polarized, and is operated by self-contained batteries. A description of the many teleph...
1/1/1975 - Contract reportsWires leading to or from underground facilities can develop hazardous voltages because of lightning exposure. The locations of many mine portals are particularly susceptible to lightning effects. The application of protective devices to limit this poten...
Eight coal mines were visited to determine their communications usage and requirements. Volume 2 details the eight mine visits, along with the conclusions reached following each visit and the final conclusions reached.
Research and Development Contract for Coal Mine Communication System: Volume 1 - Summary and Results of System StudyEight coal mines were visited to determine their communications usage and requirements. Volume 1 summarizes the entire report and includes both a dissertation on the strengths and weaknesses of various available communication techniques and a set of re...
Research and Development Contract for Coal Mine Communication System: Volume 3 - Theoretical Data BaseEight coal mines were visited to determine their communications usage and requirements. Available equipment was surveyed and evaluated to determine its applicability to the needs of the mines. Volume 3 contains all information used in predicting the per...
Research and Development Contract for Coal Mine Communication System: Volume 4 - Environmental MeasurementsEight coal mines were visited to determine their communications usage and requirements. Volume 4 describes the propagation measurements made in selected mines during the project, along with findings resulting from these measurements.
9/1/1974 - Contract reportsThe time and amplitude statistics necessary to adequately describe electromagnetic (EM) noise in mines are illustrated through computer soft- ware techniques. They are 1) Allan Variance Analyses (AVA), 2) Interpulse Spacing Distributions (ISD), 3) Pulse...
Survey of Electromagnetic and Seismic Noise Related to Mine Rescue Communications: Volume I - Emergency and Operational Mine Communications9/1/1974 - Contract reportsVolume I of this report deals with theoretical, experimental, and practical implementation aspects of the federal Bureau of Mines programs related to present and planned, emergency and operational, mine communications and miner location systems for unde...