Results 101 to 110 of about 25,535 (312)

The Metallicity Dependence of PAH Emission in Galaxies. I. Insights from Deep Radial Spitzer Spectroscopy

The Astrophysical Journal
We use deep Spitzer mid-infrared spectroscopic maps of radial strips across three nearby galaxies with well-studied metallicity gradients (M101, NGC 628, and NGC 2403) to explore the physical origins of the observed deficit of polycyclic aromatic ...
Cory M. Whitcomb, J.-D. T. Smith, Karin Sandstrom, Carl A. Starkey, Grant P. Donnelly, Bruce T. Draine, Evan D. Skillman, Daniel A. Dale, Lee Armus, Brandon S. Hensley, Thomas S.-Y. Lai, Robert C. Kennicutt   +11 more
doaj   +1 more source

Recycling of NiTi Shape Memory Alloys: Fundamental and Technological Aspects of a Vacuum Induction Melting Processing Route

Advanced Engineering Materials, EarlyView.
The present study investigates recycling of NiTi shape memory alloys via vacuum induction melting. An ingot was synthesized from elemental Ni and Ti and subjected to three subsequent remelting cycles. Remelting increases process durations and impurity levels and adversely affects microstructures and functional properties.
Sakia Sophia Noorzayee, Son Tung Mai, Sarath Menon, Braulio Gadiel Sánchez Ortega, Ralf Drautz, Alexander Kauffmann, Gunther Eggeler, Jan Frenzel   +7 more
wiley   +1 more source

Temperature structure and metallicity in H regions [PDF]

, 2010
The metallicities implied by collisionally excited lines (CELs) of heavy elements in H regions are systematically lower than those implied by recombination lines (RLs) by factors of ∼2, introducing uncertainties of the same order in the metallicities ...
Monica Rodriguez
core  

The evolution of galaxy metallicity scaling relations in cosmological hydrodynamical simulations [PDF]

, 2015
The evolution of the metal content of galaxies and its relations to other global properties [such as total stellar mass (M*), circular velocity, star formation rate (SFR), halo mass, etc.] provides important constraints on models of galaxy formation ...
Font, A.S., de Rossi, Maria Emilia, Theuns, T., De Rossi, M.E., McCarthy, I.G., Mccarthy, I. G., Font, A. S.   +6 more
core   +1 more source

[X/Fe] Marks the Spot: Mapping Chemical Azimuthal Variations in the Galactic Disk with APOGEE

The Astrophysical Journal
Chemical cartography of the Galactic disk provides insights into its structure and assembly history over cosmic time. In this work, we use chemical cartography to explore chemical gradients and azimuthal substructure in the Milky Way disk with giant ...
Zoe Hackshaw, Keith Hawkins, Carrie Filion, Danny Horta, Chervin F. P. Laporte, Christopher Carr, Adrian M. Price-Whelan   +6 more
doaj   +1 more source

Electronic Excitations in Metals and at Metal Surfaces

Chemical Reviews, 2006
Peer ...
Chulkov, E.V., Borisov, A.G., Gauyacq, J.P., Sanches-Portal, D., Silkin, V.M., Zhukov, V.P., Echenique, P.M.   +6 more
openaire   +4 more sources

Current Status and Challenges in Data Collection for Aerospace Coatings Deposited by Plasma Spraying

Advanced Engineering Materials, EarlyView.
An innovative approach has been integrated into the GRENAT project to optimize plasma spraying and coating performance. Raw materials are accelerated and melted in the plasma generated by torches, creating coatings. Monitoring sensors collect process data which are combined with ex situ characterization data.
Lila Randriamananjara, Vincent Rat, Quentin Dubreuil, Patrice Valorge, Simon Goutier, Alain Denoirjean, Olivier Messe, Céline Ruelle, Jean‐Philippe Poli   +8 more
wiley   +1 more source

Metallicity Structure in Galactic Longitude–Velocity Diagrams of the Milky Way Disk and FIRE-2 Simulations

The Astrophysical Journal
We investigate longitude–velocity ( ℓ – v ) diagrams as a diagnostic tool to study the metallicity structure of the Milky Way (MW) disk. The present-day metallicity structure encodes the imprint of the Galaxy’s formation, assembly, and secular evolution.
Victor Liu, Dana S. Balser, Trey V. Wenger   +2 more
doaj   +1 more source

Using multi-task learning to determine gas-phase metallicity of star-forming galaxies

Astronomy & Astrophysics
Aims. This study aimed to improve the estimation of the gas-phase metallicity of star-forming galaxies by using a multi-task learning approach that simultaneously performs gas-phase metallicity estimation and spectral classification of galaxies. Methods.
Wang Li-Li, Feng Jia-Bao, Yang Guang-Jun
doaj   +1 more source

Direct Metal Deposition of Graphene–Ti28Nb35.4Zr Matrix Composites With Enhanced Mechanical, Corrosion, and Biocompatibility Properties for Bone Implants

Advanced Engineering Materials, EarlyView.
Graphene nanoplatelet (0.1 wt.%) reinforcement significantly enhances the performance of β Ti‐28Nb‐35.4Zr alloy. Grain refinement, reduced water contact angle, and improved surface characteristics promote osteoblast adhesion and complete surface coverage after 7 days.
Khurram Munir, Jixing Lin, Yuncang Li, Li Zhu, Paul F. A. Wright, Cuie Wen   +5 more
wiley   +1 more source