Results 81 to 90 of about 1,643,449 (356)

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 Journal
This 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, Paulo Salvadoretti, Luciana Arnt Abichequer, George Olufunmilayo Gasper, Luis Eduardo de Souza   +4 more
doaj   +1 more source

Self‐Reconstruction of Dual‐Morphology Copper‐Iron Selenides for Cost‐Effective Oxygen Evolution Toward Industrial Alkaline Water Splitting

Advanced Functional Materials, EarlyView.
Departing from conventional Ni/Co‐based catalysts, this work presents a Ni/Co‐free CuFe–Se/CFF electrocatalyst with nanoblock–nanorod morphology. It delivers 1000 mA cm−2 at 330 mV overpotential and 620 h stability for the oxygen evolution reaction (OER).
Jiajun Wang, Jianjiang Zhao, Jiajun Zhang, Fei Wang, Tongtong Li, Ruixiang Ren, Yunmin Chen, Hua Wei   +7 more
wiley   +1 more source

Tools available for methane recovery from mines belonging to C.E.H. Petroşani [PDF]

MATEC Web of Conferences
Mine 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

Sulfur analysis of Bolu-Mengen lignite before and after microbiological treatment using reductive pyrolysis and gas chromatography/mass spectrometry [PDF]

, 2005
Atmospheric pressure-temperature programmed reduction coupled with on-line mass spectrometry (AP-TPR/MS) is used for the first time on microbiologically treated coal samples as a technique to monitor the degree of desulfurization of the various sulfur ...
Bozdemir T., Brown S. D., Durusoy T., Durusoy T., Gryglewicz G., J. Yperman, Jagtoyen M., Juszczak A., Karavaiko G. I., Klein J., Maes I. I., Maes I. I., Maes I. I., Mullens S., Olson G., Olsson G., R. Carleer, Rutkowski P., S. Mullens, Selsbo S., Stefanova M., T. Bozdemir, T. Durusoy, Van Aelst J., Van Aelst J., Y. Yürüm, Yperman J., Álvarez R.   +27 more
core   +1 more source

Upcycling of Disposable Face Masks into Water‐Resistant and Flame Retardant Foams

Advanced Functional Materials, EarlyView.
Disposable mask waste is upcycled into lightweight polypropylene‐based foams with tunable porosity and composite architectures reinforced by ear‐loop fibers. The sustainable solvent‐based process enables upcycling rates of 91% and solvent recovery of >90%.
Jingjing Pan, Erlantz Lizundia, Hao Jia, Lennart Bergström   +3 more
wiley   +1 more source

Characterization and washability studies of raw coal from the Little Tonzona Field, Alaska [PDF]

, 1991
Coal occurs in an isolated exposure of Tertiary, non-marine sedimentary rocks along the southwest bank of the Little Tonzona River, near Farewell, Alaska. The Little Tonzona River coal field is located approximately 150 air miles northwest of Anchorage,
Charlie, K.G., Phillips, N., Rao, P.D., Walsh, D.E.   +3 more
core  

Novel Functional Materials via 3D Printing by Vat Photopolymerization

Advanced Functional Materials, EarlyView.
This Perspective systematically analyzes strategies for incorporating functionalities into 3D‐printed materials via Vat Photopolymerization (VP). It explores the spectrum of achievable functionalities in recently reported novel materials—such as conductive, energy‐storing, biodegradable, stimuli‐responsive, self‐healing, shape‐memory, biomaterials, and
Sergey S. Nechausov, Patrick Fesser, Boris A. Bulgakov, Ulrich S. Schubert   +3 more
wiley   +1 more source

Potential usage of fly and bottom ash from thermal power plant ”Nikola Tesla” landfill, Serbia [PDF]

Hemijska Industrija, 2012
In Serbia, the ash from power plants has long been labelled as hazardous waste. With the adoption of the appropriate legislation this ash became secondary raw material with the potential usage.
Čudić Vladica V., Stojiljković Dragoslava D., Jovović Aleksandar M., Životić Miodrag M.   +3 more
doaj   +1 more source

Structural Exploration of Zirconium Metal–Organic Frameworks Through Linker Desymmetrization and Modulator Compensation

Advanced Materials, EarlyView.
A linker‐desymmetrization‐modulator‐compensation (LDMC) strategy for constructing structurally diverse Zr‐MOFs is reported. This approach reduces linker symmetry to create defects in Zr‐clusters, which can be compensated for by modulator coordination. Using this approach, we synthesized PCN‐1005 and PCN‐1006, featuring unprecedented Zr‐clusters. In PCN‐
Rong‐Ran Liang, Kun‐Yu Wang, Zongsu Han, Kui Tan, Yihao Yang, Zhaoyi Liu, Joshua Rushlow, Jiatong Huo, Hong‐Cai Zhou   +8 more
wiley   +1 more source