Results 51 to 60 of about 1,387,580 (319)
Life, 2022 The stable isotope composition of soluble and insoluble organic compounds in carbonaceous chondrites can be used to determine the provenance of organic molecules in space.
Heather V. Graham +4 more
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The Astrophysical Journal Letters, 2023 Nucleosynthetic isotope anomalies in meteorites allow distinguishing between the noncarbonaceous (NC) and carbonaceous (CC) meteorite reservoirs and show that correlated isotope anomalies exist in both reservoirs.
Jonas M. Schneider +2 more
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Isotope Systematics of Presolar Silicate Grains: New Insights from Magnesium and Silicon
Astrophysical Journal, 2021 We report on Mg and Si isotope data of 86 presolar silicate grains identified through NanoSIMS oxygen ion imaging in thin sections of carbonaceous and ordinary chondrites. The O, Mg, and Si isotope data of 106 presolar silicates (including grains studied
P. Hoppe +3 more
semanticscholar +1 more source
Reduction of Lead Oxide by Fine-Grained Carbonaceous Materials
Archives of Metallurgy and Materials, 2019 As part of the presented work, tests were carried out to check the possibility of replacing of conventional reducers used in the lead pyrometallurgical processes by cheaper, but equally effective substitutes. For research of lead oxide reduction, the following fine-grained carbonaceous materials were used, ie anthracite dust and coal flotation ...
T. Matuła, G. Siwiec
openaire +2 more sources
Carbonaceous chondrite NWA 4446
, 2022 The authors carried out petrographic, mineralogical, and chemical analyses (bulk chemical composition and microanalyses of mineral chemical composition) of NWA 4446 carbonaceous chondrite. NWA 4446 chondrite is classified as CV3, S2, W2.
Łuszczek, Katarzyna +7 more
core +1 more source
Galaxies with grains: unraveling dust evolution and extinction curves with hydrodynamical simulations [PDF]
Astronomy & AstrophysicsDust in galaxies is an important tracer of galaxy properties and their evolution over time. The physical origin of the grain size distribution, the dust chemical composition, and, hence, the associated ultraviolet-to-optical extinctions in diverse ...
Y. Dubois +8 more
semanticscholar +1 more source
Superiority of Thiourea Au Extraction from Low Graphiticity Carbonaceous Gold Ores
Journal of MMIJDouble refractory gold ores (DRGOs), in which few percentages of carbonaceous matter are present and gold grains are encapsulated in sulfides, have been abandoned to develop due to economic loss caused by adsorption of Au(CN)2− on carbonaceous matter ...
Ikumi SUYAMA +2 more
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Геодинамика и тектонофизика, 2022 On the one hand, the widespread use of electron microprobe analysis in the version of a scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS) and, on the other hand, the comparability of the metrological characteristics
D. K. Belyanin +3 more
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Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali, 2005 Dust is an ubiquitous inhabitant of the interstellar medium, and leaves an unmistakable signature in its optical properties, and physico-chemical evolution.
Borghese, F +4 more
doaj +1 more source
13C-depleted moissanites in subduction-related rocks: tracers of slab fluids in the Earth’s mantle and a new diamond exploration tool [PDF]
E3S Web of Conferences, 2019 A magnesian low-Ti shoshonite dike intruding Archean Norwegian Terrane includes numerous grains of black, blue and gray moissanite (SiC). Moissanite contains inclusions of native Si, Fe and Al, Fe-Cr carbides, Fe-Cr-Mn alloys and diamond.
Kepezhinskas Pavel, Kepezhinskas Nikita
doaj +1 more source