Results 51 to 60 of about 249,451 (349)

On the relation between sSFR and metallicity

, 2014
In this paper we present an exact general analytic expression $Z(sSFR)=y/\Lambda(sSFR)+I(sSFR)$ linking the gas metallicity Z to the specific star formation rate (sSFR), that validates and extends the approximate relation put forward by Lilly et al ...
Carollo, C. M., Lilly, S. J., Pipino, A.
core   +1 more source

Radii of 88 M subdwarfs and updated radius relations for low-metallicity M-dwarf stars [PDF]

, 2018
M subdwarfs are low-metallicity M dwarfs that typically inhabit the halo population of the Galaxy. Metallicity controls the opacity of stellar atmospheres; in metal-poor stars, hydrostatic equilibrium is reached at a smaller radius, leading to smaller ...
Boeshaar, Patricia C., Calchi-Novati, Sebastiano, Cushing, Michael C., Davy Kirkpatrick, J., Fajardo-Acosta, Sergio B., Henderson, Calen B., Kesseli, Aurora Y., Muirhead, Philip S., Penny, Matthew T., Scott Gaudi, B., Shvartzvald, Y., Veyette, Mark   +11 more
core   +5 more sources

Prediction of Surface Topography Parameters in Direct Laser Interference Patterning of Stainless Steel Using Infrared Monitoring and Convolutional Neural Networks

Advanced Engineering Materials, EarlyView.
This study presents an infrared monitoring approach for direct laser interference patterning (DLIP) combined with a convolutional neural network (CNN). Thermal emission data captured during structuring are used to predict surface topography parameters.
Lukas Olawsky, Marcelo Sallese, Leander Kläber, Clemens Kuhn, Keming Du, Andrés Fabián Lasagni   +5 more
wiley   +1 more source

Radial mixing and the transition between the thick and thin Galactic discs

, 2008
The analysis of the kinematics of solar neighbourhood stars shows that the low and high metallicity tails of the thin disc are populated by objects which orbital properties suggest an origin in the outer and inner galactic disc, respectively.
Arifyanto, Bensby, Bensby, Bensby, Binney, Brook, Carney, Chen, De Simone, Demarque, Edvardsson, Famaey, Famaey, Fuhrmann, Gilli, Gilmore, Grenon, Haywood, Helmi, Jørgensen, Lépine, M. Haywood, Minchev, Mishenina, Navarro, Nordström, Reddy, Reddy, Roškar, Sellwood, Soubiran, Valenti, Wielen, Wielen, Wyse, Yong   +35 more
core   +2 more sources

EBSD Study of Creep‐Induced Lattice Misorientation in MgO‐Particle‐Reinforced Austenitic Steel Composites

Advanced Engineering Materials, EarlyView.
Creep experiments at 900°C on coarse‐grained steel‐ceramic composites containing recycled magnesia reveal that higher ceramic volume fractions significantly enhance the creep resistance. Detailed EBSD investigations identify subgrain formation in the steel matrix as the dominant deformation mechanism.
Moritz Müller, Amaya Compart, Mahnaz Mehdizadehlima, Serhii Yaroshevskyi, Christos G. Aneziris, Horst Biermann, Anja Weidner   +6 more
wiley   +1 more source

A study on the metallicity gradients in the galactic disk using open clusters

Frontiers in Astronomy and Space Sciences
We study the metallicity distribution and evolution in the galactic disk based on the largest sample of open star clusters in the galaxy. From the catalog of 1,879 open clusters in the range of galactocentric distance (RGC) from 4 to 20 kpc, we ...
Yogesh Chandra Joshi, Deepak, Sagar Malhotra   +2 more
doaj   +1 more source

The Star Formation History of the Milky Way’s Nuclear Star Cluster

The Astrophysical Journal, 2023
We report the first star formation history study of the Milky Ways nuclear star cluster (NSC), which includes observational constraints from a large sample of stellar metallicity measurements.
Zhuo Chen, Tuan Do, Andrea M. Ghez, Matthew W. Hosek Jr., Anja Feldmeier-Krause, Devin S. Chu, Rory O. Bentley, Jessica R. Lu, Mark R. Morris   +8 more
doaj   +1 more source

Reduction of Oxide Inclusions During the High‐Frequency Welding of Steel via a Nonthermal Ar/H2 Plasma Jet

Advanced Engineering Materials, EarlyView.
High‐frequency (HF) welding of steel is limited by oxide inclusions that degrade weld quality. This study demonstrates, for the first time, the integration of a nonthermal Ar/H2 dielectric barrier discharge (DBD) plasma jet into HF welding. Local plasma treatment provides effective shielding and in‐situ oxide reduction, resulting in markedly fewer and ...
Viktor Udachin, Lienhard Wegewitz, René Gustus, Henning Wiche, Wolfgang Maus‐Friedrichs   +4 more
wiley   +1 more source

Does Metallicity Affect the Protoplanetary Disk Fraction? Answers from the Outer Milky Way

The Astrophysical Journal
The role of metallicity in shaping protoplanetary disk evolution remains poorly comprehended. This study analyzes the disk fraction of 10 young (0.9–2.1 Myr) and low-metallicity (0.34–0.83 Z _⊙ ) clusters located in the outer Milky Way with ...
Sudeshna Patra, Jessy Jose, Neal J. Evans II   +2 more
doaj   +1 more source

Thermodynamic Pathways of Nonequilibrium Solidification in Wire‐Arc Additive Manufacturing Fe‐Based Multicomponent Alloy Structures

Advanced Engineering Materials, EarlyView.
Geometry‐driven thermal behavior in wire‐arc additive manufacturing (WAAM) influences microstructural evolution during nonequilibrium solidification of a chemically complex Fe–Cr–Nb–W–Mo–C nanocomposite system. By comparing different deposits configurations, distinct entropy–cooling rate correlations, segregation, and carbide evolution are revealed ...
Blanca Palacios, Anthony Gonzalez, Aleksander Aleman, Tyler Dolmetsch, Tanaji Paul, Arvind Agarwal   +5 more
wiley   +1 more source