Results 41 to 50 of about 1,510,051 (362)
The effect of hard coal density on its flotation performance [PDF]
Acta Montanistica Slovaca, 2005 Hard coal flotation depends on many factors, one of which is the density of the grains floated. The heavier the grain, the greater the gravitational force that counteracts the force of adhesion between the grain and an air bubble, and the lower the ...
Ewa Małysa
doaj
Using geophysical density logging to estimate the thickness and density of coal seams in the Southern region of Brazil [PDF]
REM: International Engineering JournalThis study shows the usefulness of borehole geophysical logging of density in the identification of coal seams, in relation to other lithologies present in a coal deposit located in the south of Brazil. Four drillholes were studied.
Barbara Victoria Reffatti Andrade +4 more
doaj +1 more source
How Responsive Are EU Coal-Burning Plants to Changes in Energy Prices? [PDF]
, 2015 The European Union (EU) Emissions Trading System (ETS) has implicitly made it more expensive to burn coal relative to natural gas because coal has a higher carbon content.
Meyer, Andrew G., Pac, Grzegorz
core +1 more source
Advanced Functional Materials, Volume 36, Issue 45, 5 June 2026.This review systematically highlights the latest achievements in mixed‐valence states relevant to hydrogen and oxygen evolution reactions, providing essential insights into future directions and methods for large‐scale practical implementation. This critical review is expected to provide an overview of recent advancements in diverse valence‐state metal
Jitendra N. Tiwari +4 more
wiley +1 more source
Tools available for methane recovery from mines belonging to C.E.H. Petroşani [PDF]
MATEC Web of ConferencesMine gas is present both in coals and in the surrounding rocks and basically consists of methane (some-times almost 100%) mixed with carbon dioxide (up to 5%) with nitrogen (a few percent) and traces of carbon monoxide.
Chiuzan Emeric, Matei Adrian
doaj +1 more source
Research progress on preparation and physicochemical properties of coal-based graphene quantum dots
Meitan kexue jishu, 2023 Graphene quantum dots (GQDs) have attracted great research interest due to their remarkable quantum confinement and edge effects. In addition to exhibiting stable photoluminescence, it also has many advantages such as low cytotoxicity, good solubility ...
Ruifeng MU +5 more
doaj +1 more source
Continuous coal processing method [PDF]
, 1980 A coal pump is provided in which solid coal is heated in the barrel of an extruder under pressure to a temperature at which the coal assumes plastic properties.
Ryason, P. R.
core +1 more source
Water absorption and salt attack resistance of coal ash brick made of different percentage of foam content [PDF]
, 2014 Coal ash which constitute of fly ash and bottom ash were proved to be used as main component in brick production. However, published work on the coal ash brick with addition of foam in order to produce lightweight brick is still lacking. This thesis
Ismail, Sushilawati
core +1 more source
Advanced Functional Materials, EarlyView.Inspired by natural silicified wood, a biomimetic mineralized chitin‐derived aerogel is constructed. It can withstand 81 000 times its own weight, and its backside temperature is 130.4°C after exposure to ∼1300°C butane flame for 600 s, exhibiting high‐strength, fire‐resistance, and super thermal‐insulation properties.
Kai Xu +11 more
wiley +1 more source
Dynamic evolution mechanism of water-bearing coal permeability and water film under stress
Meitan kexue jishu, 2023 To explore coal permeability evolution mechanism under the comprehensive action of multiple factors including stress - adsorption - water and slippage effect, considering the coal deformation induced by stress - adsorption, the expression of water film ...
Shulei DUAN +3 more
doaj +1 more source