underground mines
Measurement of the Influence of Antennas on Radio Signal Propagation in Underground Mines and Tunnels
... and underground mining environments is quite different from that on the surface and has not been well ...of underground mines, extensive measurements were made to study the influence of antenna pattern ...
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Wireless Communication Systems For Underground Mines – A Critical Appraisal
... for underground mines, implementation of TTE and TTA technology should be done alongside the cable system as a ...for underground mine is more popular as compared to TTE communication ...to ...
5
HIGH SPEED INTEGRATED SIGNALING SYSTEM FOR UNDERGROUND MINES
... 107 underground fires occurred in coal and metal/nonmetal mines from 1990 to 1995 in the United ...for underground miners during a fire or other emergency can be measured in terms of ...for ...
7
Evaluation of Environmental Hazard in Underground Mines Using Adaptive Neuro- Fuzzy Model
... of underground mines and workplaces where workers are exposed to these radio ...radium. Underground workplaces show high radon levels, as of the mines and ...
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A New Ultra-Wideband Beamforming for Wireless Communications in Underground Mines
... Abstract—In this paper, a novel ultra-wideband switched-beam antenna system based on 4 × 4 two-layer Butler matrix is presented and implemented to be used in hostile environment, such as underground mines. ...
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Charging of Materials Non Metallic Used in Underground Mines Endangered by Firedamp and/or Coal Dust
... The expansion parts and components of non-metallic in devices have become a fait accompli. In the case parts, compo- nents of non-metallic are used in atmospheres explosive and may be a potential source of ignition [1]. ...
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Methods of Reducing the Front Performance Flame at the Underground Mines Works
... coal mines, by creating an aqueous barrier (increased density) in the propagation path of the flame front and incandescent particles, using a high-energy pyrotechnic composition based on ...
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Production Potential Of Nchanga Underground Mines Collapsed Blocks
... explains the mineral deposit status the demerits of this approach is the limitation in the number of criteria and the selection alternatives in this technique, although the depth and the rock mass rating scores are added ...
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EVOLUTION OF NEW DAMAGE CRITERION FOR ESTIMATING BLAST INDUCED DAMAGE ON UNDERGROUND MINE STRUCTURES DUE TO SURFACE BLASTING CARRIED IN NEIGHBORING MINES .
... Blast vibration measurements were collected from Samleshwari OCM and Hingir Rampur UG mine operated by Mahanadi Coalfields Ltd., a subsidiary of Coal India Ltd. Figure 1 depicts a schematic view of typical vertical ...
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Development of an atmospheric datamanagement system for underground coal mines
... maintained. Underground mines generate a large range of data, and this presents a challenge for the AMS database system, especially with systems that have many sensors reporting a large quantity of ...
5
An explanation of large-scale coal and gas outbursts in underground coal mines: the effect of low-permeability zones on abnormally abundant gas
... Abstract. Large-scale coal and gas outbursts pose a risk of fatal disasters in underground mines. Large-scale outbursts (outburst of coal and rock greater than 500 t) in recent years in China indicate that ...
8
Effects and controls of lateral refraction in underground coal mines
... other mines was ...its underground network while BMA Crinum and Gregory mines use TCRA1103 as does Oaky ...These mines experience reading variances of 10 – 30” which they directly attribute to ...
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Reliability and Availability Improvement of Side Discharge Loaders by Using Importance Measure in Underground Coal Mines
... coal as a main source of energy which contributes to national development. Improvement of productivity has become an important goal for today’s coal industry to meet the energy requirement and increased price ...
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Effect of ventilation air velocities on diesel particulate matter dispersion in underground coal mines
... Diesel-operated man-riding vehicles are used to carry workers from the portal to specific sites in underground mines. These vehicles minimize the coal mine operators’ travel time and thus improve their ...
5
Underground check survey
... At Mount Isa Copper Operations (MICO) there are two underground mines which are called X41 and Enterprise (ENT). The survey department at Mount Isa performs surveys in both X41 and Enterprise to meet the ...
105
The Mines Regulations, 2003
... (b) at any other interval of time directed by the chief mines inspector. (4) If extrapolation of the results of a test of a balance rope indicates that the rope will lose more than 10% of its original breaking ...
182
OBSTACLES, MINES, AND DEMOLITIONS
... b. Engagement priorities for snipers are determined by the relative importance of the targets to the effective operations of the enemy. Sniper targets usually include tank commanders, di[r] ...
47
The Feature of Underground Channel for the Wireless Underground Sensor Networks
... Wireless Underground Channel. In fact, the underground environment consists of soil, rock and water instead of the ...the underground environment via one small induction coil were evaluated ...
5
Taseko Mines Limited
... On December 31, 2003, the Company reached agreements with Gibraltar Reclamation Trust Limited Partnership (the “GRT Partnership”), a largely arm’s-length private Vancouver-based mining investment partnership, which ...
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VIII. The Use of Mines
... a right to render passage over the high seas unnecessarily hazardous. It is g~nerally adn1itted that neutrals and non- coinbatants enter the field of actual hostile operatio[r] ...
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