Results 111 to 120 of about 27,054 (290)

Population of Nonmetallic Inclusions in Liquid High‐Silicon Electrical Steel in Contact With MgO–C Refractories Based on Recyclates and Environmentally Friendly Binders

Advanced Engineering Materials, EarlyView.
The formation of nonmetallic inclusions (NMIs) was investigated in this study, carrying out immersion tests for 30 min at a temperature of 1600°C with liquid high‐silicon electrical steel (Si ≈ 3 mass‐%) and different MgO–C refractories. Conventional MgO–C refractories were considered, as well as MgO–C refractories containing MgO–C recyclate and ...
Lukas Neubert, Matheus Roberto Bellé, Florian Kerber, Dinesh Kumar Gunasekar, Hans‐Jörn Weddige, Christos G. Aneziris, Olena Volkova   +6 more
wiley   +1 more source

Heating experiments of carbon grains: Implication for the origin of interstellar dust [PDF]

, 2003
Amorphous carbonaceous grains produced in a methane gas atmosphere were analyzed by high resolution transmission electron microscope (HRTEM). Structural alteration of the amorphous carbonaceous grains was directly observed by in situ HRTEM observation ...
Kaito,Chihiro, Saito,Yoshio, Sato,Takeshi   +2 more
core   +1 more source

Dust properties along anomalous extinction sightlines. II. Studying extinction curves with dust models

, 2010
The large majority of extinction sight lines in our Galaxy obey a simple relation depending on one parameter, the total-to-selective extinction coefficient, Rv.
Barbaro, Barbaro, Barlow, Bohlin, Cardelli, Cardelli, Carnochan, Clayton, Clayton, Cowie, Draine, Draine, Draine, Esipov, Fitzpatrick, Fitzpatrick, Fitzpatrick, Fitzpatrick, Fresneau, G. Barbaro, Geminale, Georgelin, Gordon, Jenniskens, Jones, Jones, Li, Li, Li, Liu, Mathis, Mathis, Mattioda, Mazzei, Meyer, P. Mazzei, Papaj, Points, Qin, Reed, Savage, Straižys, Urquhart, Valencic, van Dishoeck, Wakker, Wakker, Wegner, Wegner, Weingartner, Wesselius, Wu, Wu, Zubko   +53 more
core   +1 more source

Corrosion and Process Analysis of a Preoxidized MgO Recyclate‐Based Cermet Anode in Laboratory‐Scale Na‐Cryolite Molten Salt Electrolysis of Aluminum at 1000°C

Advanced Engineering Materials, EarlyView.
EDX elemental map of the pre‐oxidized MgO–steel cermet anode cross section after electrolysis. The development of inert anodes for aluminum electrolysis remains challenging due to the high corrosivity of cryolite‐based melts at 950°C–1000°C. This study investigates the corrosion and process behavior of a carbon‐free MgO–steel cermet anode derived from ...
Alexander Adamczyk, Farhan Hossain, Felipe A. Garcia Paz, Serhii Yaroshevskyi, Felix Drechsler, Daniel Vogt, Christos G. Aneziris, Alexandros Charitos   +7 more
wiley   +1 more source

Effects of Metallicity on Graphite, TiC, and SiC Condensation in Carbon Stars

The Astrophysical Journal
From transmission electron microscopy and other laboratory studies of presolar grains, the implicit condensation sequence of carbon-bearing condensates in circumstellar envelopes of carbon stars is (from first to last) TiC-graphite-SiC.
Gabrielle M. Adams, Katharina Lodders
doaj   +1 more source

Activated Amorphous Carbon With High-Porosity Derived From Camellia Pollen Grains as Anode Materials for Lithium/Sodium Ion Batteries

Frontiers in Chemistry, 2018
Carbonaceous anode materials are commonly utilized in the energy storage systems, while their unsatisfied electrochemical performances hardly meet the increasing requirements for advanced anode materials.
Kaiqi Xu, Yunsha Li, Yunsha Li, Jiawen Xiong, Xing Ou, Wei Su, Guobin Zhong, Chenghao Yang   +7 more
doaj   +1 more source

Raman Spectroscopic Identification of Oxide Phases in a Corroded MgO–Steel Composite Anode Used in Aluminum Molten Salt Electrolysis

Advanced Engineering Materials, EarlyView.
Micro‐Raman spectroscopy is applied to characterize corrosion products in a recycled‐based MgO–316L steel composite anode after molten salt electrolysis. A depth‐dependent Fe–O/Fe–Al–O layer sequence of magnetite, hercynite, and an Al‐doped magnetite transition zone is identified.
Felix Drechsler, Serhii Yaroshevskyi, Alexander Adamczyk, Mahnaz Mehdizadehlima, Julia Richter, Cameliu Himcinschi, David Rafaja, Alexandros Charitos, Christos G. Aneziris, Jens Kortus   +9 more
wiley   +1 more source

Open problems and perspectives offered by current and future instruments

EPJ Web of Conferences, 2012
We summarize recent observational and theoretical results and discuss the open challenges for astrochemistry and the promises offered by the current and upcoming instruments. Some of the main challenges are listed below. Characterization of the structure
Gérin M.
doaj   +1 more source

The Sedimentary Origin of Black and White Banded Cherts of the Buck Reef, Barberton, South Africa

Geosciences, 2019
The Buck Reef is a 250−400 m thick sequence of banded black and white (B&W) cherts deposited ca. 3416 Ma ago in a shallow basin. We provide field, petrological and geochemical constraints on the chert-forming process and the origin of the ...
Morgane Ledevin, Nicholas Arndt, Catherine Chauvel, Etienne Jaillard, Alexandre Simionovici   +4 more
doaj   +1 more source

Spitzer Infrared Spectrograph Observations of Magellanic Cloud Planetary Nebulae: the nature of dust in low metallicity circumstellar ejecta

, 2007
We present 5 - 40 micron spectroscopy of 41 planetary nebulae (PNe) in the Magellanic Clouds, observed with the Infrared Spectrograph on board the Spitzer Space Telescope. The spectra show the presence of a combination of nebular emission lines and solid-
Arturo Manchado, D. Anibal Garcia‐Hernandez, Eva Villaver, Groenewegen M. A. T., James E. Davies, Jose V. Perea‐Calderon, Leisy P., Letizia Stanghellini, Moutou C., Pedro Garcia‐Lario, Peimbert M., Richard A. Shaw, Trams N. R., Zhang C. Y.   +13 more
core   +1 more source