Results 31 to 40 of about 614 (173)

Caracterização de materiais cerâmicos à base de CuCr 2 O 4 preparados pelo método da reação de combustão em solução para uso como pigmentos

open access: yesCerâmica
Resumo Pós cerâmicos à base de CuCr2O4 foram preparados pelo método da reação de combustão em solução a partir da calcinação no intervalo de 500 a 1100 °C, tendo por finalidade a aplicação destes como pigmento cerâmico.
M. B. M. Coelho   +7 more
doaj   +1 more source

Jewelled Byzantine and Medieval Reliquaries of the True Cross: Peridots and Other Gemstones in Material and Symbolic Perspective

open access: yesJournal of Raman Spectroscopy, Volume 57, Issue 10, Page 1727-1756, October 2026.
An interdisciplinary in situ study of jewelled reliquaries of the True Cross integrates gemmology and portable analytical techniques, revealing new evidence on the identification and symbolic role of peridots and other gemstones. ABSTRACT Jewelled crosses containing relics of the True Cross occupy a central position in the devotional, artistic and ...
Stefania Martiniello   +2 more
wiley   +1 more source

CORROSION OF BASIC REFRACTORIES IN COPPER METALLURGY

open access: yesActa Metallurgica Slovaca, 2015
Knowledge of corrosion processes on the melt – solid boundary is very important for life time of refractories and for refractory using design. The aim of this study was to realize and evaluate laboratory corrosion tests of three types basic refractories ...
Pavol Vadasz, David Medved
doaj   +1 more source

Fabrication and characterization of MXene/CuCr2O4 nanocomposite for diverse energy applications

open access: yesJournal of Materials Research and Technology, 2023
This work comprises facile synthesis of MXene/CuCr2O4 nanocomposite using co-precipitation method for studying unique and significant energy storage properties by triggering world to design and fabricate nano-electrode material with maximized specific ...
Rubia Shafique   +8 more
doaj   +1 more source

Mixed‐Metal Promotion in a Manganese‐Molybdenum Oxynitride as Catalyst to Integrate C─C and C─N Coupling Reactions for the Direct Synthesis of Acetonitrile from Syngas and Ammonia

open access: yesAdvanced Materials, Volume 38, Issue 51, 11 September 2026.
Transition metal oxy/carbo‐nitrides show great promise as catalysts for sustainable processes. A Mn‐Mo mixed‐metal oxynitride attains remarkable performance for the direct synthesis of acetonitrile, an important commodity chemical, via sequential C─N and C─C coupling from syngas (C1) and ammonia (N1) feedstocks.
M. Elena Martínez‐Monje   +7 more
wiley   +1 more source

Beach Gold and Heavy Mineral Concentrates on Tiwai Spit Gravel Strand Plain, Southland, New Zealand

open access: yesNew Zealand Journal of Geology and Geophysics, Volume 69, Issue 3, September 2026.
The Holocene Tiwai Spit on Foveaux Strait is a 12 km by 2 km gravel‐dominated strand plain, ∼10 m above present sea level. Gravel clasts are dominated by well‐rounded quartz cobbles, pebbles and granules derived from Otago Schist 200 km to the north in evolving river drainage systems during late Cenozoic.
Marshall Palmer, Dave Craw
wiley   +1 more source

Minerals identification and characterization using a new 3D printed composite- structured split ring resonator microwave sensor

open access: yesDiscover Applied Sciences
The identification of minerals is crucial for optimizing economic and environmental strategies worldwide. This study presents a novel approach to mineral identification and characterization using microwave sensing technology.
Madan Kumar Sharma   +5 more
doaj   +1 more source

Coupled Gas and Mineral Chemistry in a 60‐Day Venus Weathering Experiment at the Glenn Extreme Environments Rig (GEER)

open access: yesJournal of Geophysical Research: Planets, Volume 131, Issue 9, September 2026.
Abstract Investigations of the venusian surface suggest chemical alteration (weathering) of rocks in contact with a hot, high‐pressure atmosphere. This alteration was anticipated based on mineral stability considerations and has been supported by laboratory experiments conducted under Venus surface conditions.
Alison R. Santos   +5 more
wiley   +1 more source

Bismuth-nickel mineralization in chromitites of Mariinskii deposit (Urals emerald mines)

open access: yesЛитосфера, 2018
The unusual Bi-Ni mineralization, represented by parkerite, millerite, bismutohauchecornite, bismuthinite, nickeline and, possibly nickel analogue of smythite (?), found in the metasomatically altered chromite rocks of the Mariinsky emerald-beryllium ...
Mikhail P. Popov   +2 more
doaj   +2 more sources

PERFORMANCE EVALUATION OF COMMERCIAL COPPER CHROMITES AS BURNING RATE CATALYST FOR SOLID PROPELLANTS DOI 10.5028/jatm.2010.02038010

open access: yesJournal of Aerospace Technology and Management, 2011
Copper chromites are well known as burning rate catalysts for the combustion of composite solid propellants, used as a source of energy for rocket propulsion.
Eunice Aparecida Campos   +5 more
doaj  

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