Results 131 to 140 of about 73,550 (313)
, 1915 Made available in DSpace on 2013-07-22T17:57:09Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) coalmininginilli13andr.pdf: 19457700 bytes, checksum: d04ea6a5c6be46ffb7c280268ae01742 (MD5) Previous
Andros, S.O.
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Deep Underground Science and Engineering, EarlyView.This review elucidates the velocity–dispersion–attenuation coupling mechanisms of wave propagation in rock masses, compares six representative models, and reveals how pressure, temperature, mineral composition, and anisotropy jointly control dynamic responses in complex geological media.
Jiajun Shu +8 more
wiley +1 more source
Coal operator mining facts - 2001 [PDF]
In 2001, a total of 2,144 coal mining operations reported employment to the Mine Safety and Health Administration (MSHA). Coal mines comprised 14.7% of all mining operations. Bituminous mines comprised 92.0% (n=1,972) and anthracite mines 8.0% (n=172) of
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Deep Underground Science and Engineering, EarlyView.In response to the problem of strong mining pressure manifestation along the goaf roadway in a thick coal seam mining area, this study uses a new type of combined blasting roof cutting technology to effectively control the manifestation and deformation of mining pressure along the goaf roadway.
Xiaoding Xu +6 more
wiley +1 more source
Meitan kexue jishuDue to alkaline earth metal oxide such as calcium and magnesium being existed in the fly ash, its slurry is alkaline. It’s easy to pollute the underground water when the slurry was filled in the goaf.
Qiuge YU +4 more
doaj +1 more source
Have Prices of Internationally Traded Steam Coal been Marginal Cost Based? [PDF]
During 2007 and 2008 steam coal prices soared to unprecedented levels. Since then much has been speculated about the drivers of these price peaks. This paper is concerned with the costs of steam coal allocation in the seaborne market and their influence ...
Trueby, Johannes, Paulus, Moritz
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Deep Underground Science and Engineering, EarlyView.The fused data extracted from the distributed monitoring system as the data basis, combined with dynamic geological data, are imported into a deep learning model. As the geological conditions of mining and excavation change, the risk of water inrush at the working face is retrieved in real time.
Yongjie Li +4 more
wiley +1 more source
Coal mining industry in the provinces of Chikuzen and Buzen, Kyushu, the
, 1911 Six charts and 1 map (55 x 41 cm. folded to 15 x 21 cm.)
Chikuho Coal Mining Association
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Deep Underground Science and Engineering, EarlyView.This study demonstrates the feasibility of an underground closed‐loop thermal storage facility at a post‐mining site, intended for seasonal heat energy storage. Its principal design shows water flow directions in winter and summer (1, 2), heat pumps (3), an upper water reservoir (4), and connecting pipes (5).
Dmytro Rudakov, Oleksandr Inkin
wiley +1 more source
IEEE AccessIn recent years, the advancement in ranging accuracy and distance requirements in the ship industry has underscored the paramount importance of controlling ranging error.
Zhiliang Chen +4 more
doaj +1 more source