Results 191 to 200 of about 2,137,122 (310)
New techniques for mining thin-seam mountaintop coal reserves [PDF]
"The U.S. Bureau of Mines is conducting research aimed at providing technology for a low-cost, high-recovery, environmentally acceptable mining system to recover the vast thin-seam coal reserves existing in the mountainous areas of the Appalachian region
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Deep Underground Science and Engineering, EarlyView.This study proposes an exponentially‐constrained Gaussian mixture model (EcGMM) to quantify vertical fracture heterogeneity in stratified roof strata. The model integrates a piecewise exponential decay term capturing global stress dissipation with Gaussian components representing localized fracture intensification at lithological interfaces.
Huiqing Yuan +5 more
wiley +1 more source
Soil heavy metals in a typical coal mining cluster of Northern China: Pollution, source apportionment, and eco-health risks. [PDF]
iScienceDu D, Fang L, Yu S, Bai Y, Hao Y, Li H.
europepmc +1 more source
Geologic investigations of underground coal mining problems [PDF]
"A series of geological surveys were completed in six coal mines in connection with a Bureau of Mines research program on methane control. The aim of these surveys was two fold: first, to study the overall geology of the coalbed, and second, to use the ...
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Deep Underground Science and Engineering, EarlyView.This study derives an explicit expression for the lining force transmission coefficient of underground gas storage lined rock caverns (LRCs) via the complex variable function method, considering the displacement release coefficient. Taking the 1‰ tensile strain of surrounding rock as the criterion to determine lining thickness, it systematically ...
Yaohui Li, Jianping Yang, Weizhong Chen
wiley +1 more source
4D Millimeter-Wave Radar Point Cloud Sensing for Face Guard Detection and Cutting-Interference Warning in Fully Mechanized Coal Mining Faces. [PDF]
Sensors (Basel)Zhao Y, Wang Z, Chen M, Wei D.
europepmc +1 more source
Coal contractor mining facts - 2008 [PDF]
"An independent contractor is defined by the Mine Safety and Health Administration (MSHA) as "any person, partnership, corporation, subsidiary of a corporation, firm, association or other organization that contracts to perform services or construction at
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Deep Underground Science and Engineering, EarlyView.The graphical abstract presents a structured decision‐support framework for assessing the feasibility of converting depleted oil and gas wells into geothermal energy systems. The left panel illustrates a comprehensive, multi‐stage decision‐making framework progressing from prefeasibility screening and technical–economic analysis to policy alignment ...
Karolina Bieryt +3 more
wiley +1 more source
Physiological and Biochemical Responses of <i>Nitraria tangutorum</i> to Long-Term Saline Irrigation in an Arid Coal-Mining Restoration Area. [PDF]
Int J Mol SciWaheed A +7 more
europepmc +1 more source
Deep Underground Science and Engineering, EarlyView.The graphical abstract summarizes a geographic information system (GIS)‐based synthesis of renewable energy resources in Northeastern Morocco, focusing on the Guercif‐Guilliz and Beni Snassen areas. It visually presents the spatial distribution of solar irradiation and wind energy potential derived from available datasets, alongside their relationship ...
Meryem Redouane +5 more
wiley +1 more source