scholarly journals Substantion of volumetric modeling of rock massif around mine working and development workings

2015 ◽  
Vol 9 (3) ◽  
pp. 367-374 ◽  
Author(s):  
S.F Vlasov ◽  
◽  
V.S Vlasov ◽  
Keyword(s):  
Mine Working ◽  
Rock Massif

Engineering aspects of the mine working development in difficult hydrogeological conditions

2019 ◽  
pp. 132-141
Author(s):  
V.G. Hrinov ◽  
◽  
A.A. Khorolskyi ◽  
Yu.O. Vynohradov ◽  
◽  
...  
Keyword(s):  
Mine Working ◽  
Hydrogeological Conditions

Method of construction of the predictive deformation model of the edge zone of the career in the rock massif

2018 ◽  
Vol 1 (1) ◽  
pp. 72-78
Author(s):  
Godovnikov N.A. ◽  
◽  
Dunaev V.A. ◽  
Ignatenko I.M. ◽  
◽  
...  
Keyword(s):  
Rock Massif ◽  
Deformation Model ◽  
Edge Zone

THE ESTABLISHMENT OF DYNAMIC PARAMETERS OF THE ZONE OF LIMIT STATE OF COAL-ROCK MASSIF

2019 ◽  
pp. 34-40
Author(s):  
А. Molodetskyy ◽  
◽  
О. Gladkaya ◽  
V. Slyusarev ◽  
◽  
...  
Keyword(s):  
Limit State ◽  
Rock Massif ◽  
Dynamic Parameters ◽  
Coal Rock

scholarly journals Interference Mitigation for Visible Light Communications in Underground Mines Using Angle Diversity Receivers

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 367 ◽  
Author(s):  
Pablo Palacios Játiva ◽  
Milton Román Cañizares ◽  
Cesar A. Azurdia-Meza ◽  
David Zabala-Blanco ◽  
Ali Dehghan Firoozabadi ◽  
...  
Keyword(s):  
Visible Light ◽  
Mine Working ◽  
Channel Model ◽  
Underground Mining ◽  
Cumulative Distribution ◽  
Line Of Sight ◽  
Delay Spread ◽  
Noise Power ◽  
Working Face ◽  
Angle Diversity

This paper proposes two solutions based on angle diversity receivers (ADRs) to mitigate inter-cell interference (ICI) in underground mining visible light communication (VLC) systems, one of them is a novel approach. A realistic VLC system based on two underground mining scenarios, termed as mining roadway and mine working face, is developed and modeled. A channel model based on the direct component in line-of-sight (LoS) and reflections of non-line-of-sight (NLoS) links is considered, as well as thermal and shot noises. The design and mathematical models of a pyramid distribution and a new hemi-dodecahedral distribution are addressed in detail. The performances of these approaches, accompanied by signal combining schemes, are evaluated with the baseline of a single photo-diode in reception. Results show that the minimum lighting standards established in both scenarios are met. As expected, the root-mean-square delay spread decreases as the distance between the transmitters and receivers increases. Furthermore, the hemi-dodecahedron ADR in conjunction with the maximum ratio combining (MRC) scheme, presents the best performance in the evaluated VLC system, with a maximum user data rate of 250 Mbps in mining roadway and 120 Mbps in mine working face, received energy per bit/noise power of 32 dB and 23 dB, respectively, when the bit error rate corresponds to 10 − 4 , and finally, values of 120 dB in mining roadway and 118 dB in mine working face for signal-to-interference-plus-noise ratio are observed in a cumulative distribution function.

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