Results 71 to 80 of about 1,387,580 (319)

Mineralogy and petrology of Dominion Range 08006: A very primitive CO3 carbonaceous chondrite

Geochimica et Cosmochimica Acta, 2019
Here we report the relative degrees of thermal metamorphism for five Antarctic Ornans-like carbonaceous (CO) chondrites, including Dominion Range (DOM) 08006, as determined from the Cr-content of their FeO-rich (ferroan) olivine.
J. Davidson, C. Alexander, R. Stroud, H. Busemann, L. Nittler   +4 more
semanticscholar   +1 more source

Altered primary iron sulfides in CM2 and CR2 carbonaceous chondrites: Insights into parent body processes

Meteoritics and Planetary Science, 2020
The presence of primary iron sulfides that appear to be aqueously altered in CM and CR carbonaceous chondrites provides the potential to study the effects and, by extension, the conditions of aqueous alteration.
S. Singerling, A. J. Brearley
semanticscholar   +1 more source

Creating Ti–Fe α/β Alloys by Diffusion‐Driven Solid‐State Processing

Advanced Engineering Materials, EarlyView.
This study proposes making alloys containing fast diffusing elements that are difficult to produce by ingot metallurgy, by diffusion‐driven solid‐state HIP processing of elemental powders and low‐temperature homogenisation. Here, novel Fe‐Ti α–β alloys are formed having fine α–β lamellae, a small β prior grain size without significant intermetallics ...
Jiaqi Xu, Xun Zhang, Jack M. Donoghue, Albert D. Smith, Rahul Unnikrishnan, Rhys Thomas, Vahid Nekouie, Jie Luo, Dongchen Hu, Michael Preuss, Philip J. Withers   +10 more
wiley   +1 more source

Chemistry in Retrieved Ryugu Asteroid Samples Revealed by Non-Invasive X-ray Microanalyses: Pink-Beam Fluorescence CT and Tender-Energy Absorption Spectroscopy

Geosciences
The Hayabusa2 space mission recently retrieved 5.4 g of material from asteroid Ryugu, providing the first direct access to pristine material from a carbonaceous asteroid. This study employs a novel combination of non-invasive synchrotron X-ray techniques
Paul Northrup, Ryan Tappero, Timothy D. Glotch, George J. Flynn, Mehmet Yesiltas, Yoko Kebukawa, Leonard Flores, Marina E. Gemma, Gavin Piccione   +8 more
doaj   +1 more source

Recognition of Detrital Carbonaceous Material in the Ryoke Metamorphic Belt by Using Raman Thermometry: Implications for Thermal Structure and Detrital Origin

Lithosphere, 2022
Raman spectroscopy of carbonaceous material (RSCM) thermometry is an effective method to determine the thermal structure of metasedimentary domains with high spatial resolution.
Ken Yamaoka, Simon R. Wallis, Akira Miyake, Yui Kouketsu   +3 more
doaj   +1 more source

Incorporation of Selenium into Sol–Gel‐Derived Bioactive Glass: Influence on Glass Structure, Bioactivity, and its Selective Cytotoxicity

Advanced Engineering Materials, EarlyView.
Selenium was incorporated into a sol–gel‐derived bioactive glass to enable sustained therapeutic ion release. The selenium‐containing glass preserved bioactivity while selectively inducing cytotoxicity in osteosarcoma cells and maintaining osteoblastic viability.
Breno Rocha Barrioni, Thalita Marcolan Valverde, Talita Martins, Guilherme Mattos Jardim Costa, Alfredo Miranda de Goes, Marcello Rosa Dumont, Eduardo Henrique Martins Nunes, Marivalda de Magalhães Pereira   +7 more
wiley   +1 more source

Investigating Silicate, Carbon, and Water in the Diffuse Interstellar Medium: The First Shots from WISCI

The Astrophysical Journal
The dusty interstellar medium (ISM) of the Milky Way is distributed in a complex, cloudy structure. It is fundamental to the radiation balance within the Milky Way, provides a reaction surface to form complex molecules, and is the feedstock for future ...
S. T. Zeegers, Jonathan P. Marshall, Karl D. Gordon, Karl A. Misselt, G. P. P. L. Otten, Jeroen Bouwman, Jean Chiar, Marjorie Decleir, Thavisha Dharmawardena, F. Kemper, Aigen Li, Mayank Narang, Alexey Potapov, Manoj Puravankara, Peter Scicluna, Himanshu Tyagi, Eleonora Zari, ChuanYu Wei, Lex Kaper, Frank Backs, Stefan T. Bromley, Laurie Chu, Elisa Costantini, T. R. Geballe, Joel D. Green, Chamani Gunasekera, Burcu Günay, Thomas Henning, Olivia Jones, Joan Mariñoso Guiu, Melissa McClure, Yvonne J. Pendleton, Julia C. Roman-Duval, Tomer Shenar, Alexander G. G. M. Tielens, L. B. F. M. Waters   +35 more
doaj   +1 more source

Kivesvaara C2 chondrite: silicate petrography and chemical composition [PDF]

Bulletin of the Geological Society of Finland, 1983
Fragments of the Kivesvaara meteorite were said to have been found in Paltamo, northern Finland in 1968. The chemical and mineral composition and the textural features show that this meteorite is a rare C2 carbonaceous chondrite.
K.A. Kinnunen, R. Saikkonen
doaj   +1 more source

Sintering of Grains of Some Carbonaceous Substances

The Journal of the Society of Chemical Industry, Japan, 1957
黒鉛化容易な炭素質物質の450～700℃間における状態を推測するため,炭素質粒子間の焼結現象を中心に検討した。用いた試料のうち,サラン,セルロース,泥炭の各320℃焼成物は焼結せず,ビオラントロンおよび石油ピッチ,タール用いた試料のうち,サラン,セルロース,泥炭の各320℃焼成物は焼結せず,ビオラントロンおよび石油ピッチ,タールに述べた示差熱分析における500～700℃間の吸熱現象,さらにすでに知られているこの温度範囲におけるC0(層構の厚さ)の変化曲線等の関係からこの温度範囲の状態を次のように考えた。すなわち-O-,-C-C-結合の分裂を伴なって炭素構造に転移した後,層構造に結合する低分子量原子団および共存する低分子物質の熱振動が急速に現われ,部分的な半融状態に近い状態となり ...
openaire   +2 more sources

Additive Manufacturing of Continuous Fibre Reinforced Composites: Process, Characterisation, Modelling, and Sustainability

Advanced Engineering Materials, EarlyView.
Additive manufacturing provides precise control over the placement of continuous fibres within polymer matrices, enabling customised mechanical performance in composite components. This article explores processing strategies, mechanical testing, and modelling approaches for additive manufactured continuous fibre‐reinforced composites.
Cherian Thomas, Amir Hosein Sakhaei
wiley   +1 more source