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Results 31 - 40 of 95
Earth Conductivity Estimation from Through-the-Earth Measurements of 94 Coal Mines Using Different Electromagnetic Models10/1/2014 - Peer reviewed journal articlesAn analyis of TTE measurement data collected from 94 mines in order to determine the apparent conductivity of the overburden based on three different models: a homogenous half-space model, a thin sheet model, and an attenuation factor or Q-factor model.
9/25/2014 - Contracts and cooperative agreementsA contract to develop a Universal Signal Evaluation Package for 75- and 150-MHz bands, adapt a passive magnetic amplifier for 900-MHz, and investigate energy harvesting technologies.
8/15/2014 - Contracts and cooperative agreementsA contract to determine the factors that most affect signal transmission and reception for through-the-earth communication systems.
8/14/2014 - Contracts and cooperative agreementsA contract to incorporate a wireless base station into the MagneLink Magnetic Communication System (MCS) and to develop a mechanism that automatically activates a portable wireless text messaging device when a refuge chamber is opened or deployed.
1/6/2014 - Contracts and cooperative agreementsA contract to develop a robust, intrinsically safe system that will incorporate atmospheric monitoring, two-way communications and miner tracking, all in a single network.
7/24/2013 - Research areasEmergency Communications and Tracking Topic Page
12/1/2012 - Technology NewsA technology to provide a two-way communications system to improve miners' ability to communicate from underground to surface.
9/22/2012 - Contracts and cooperative agreementsA contract to develop a practical methodology with appropriate technical guidelines that enables mine operators and enforcement agencies to evaluate the reliability of underground communications, tracking, and atmospheric monitoring systems.
9/18/2012 - Contracts and cooperative agreementsA contract to design a prototype two-way, through-the-earth (TTE) emergency communication system, fabricate the hardware, and test the system at an underground coal mine.
Performance and Safety Investigation of Emergency Backup Batteries and Battery Charging Systems for Underground Mining Applications9/18/2012 - Contracts and cooperative agreementsA contract to address issues associated with battery selection, use, and charging for the underground coal mining environment, specifically with respect to MINER Act requirements for mine communications and personnel tracking technology.