Results 51 to 60 of about 208,001 (309)

Development of Ternary Magnesium Alloys for Laser Powder Bed Fusion: Optimizing Oxide Layer Thickness

Advanced Engineering Materials, EarlyView.
Additive manufacturing of magnesium alloys by laser is difficult because the melting point of the oxide layer is much higher than the evaporation temperature of the metal underneath. Making the oxide layer thinner can solve this problem. Alloying magnesium with strontium makes the oxide layer thinner, especially at 0.5 wt%.
Elmar Jonas Breitbach, Stefan Julmi, Sabine Behrens, Tatiana Blank, Arvid Abel, Nicole Emminghaus, Ludger Overmeyer, Christian Klose, Hans Jürgen Maier   +8 more
wiley   +1 more source

The Long-period Spectroscopic Orbit and Dust Creation in the Wolf–Rayet Binary System WR 125

The Astrophysical Journal
Several long-period binaries with a carbon-rich Wolf–Rayet star and an OB star produce dust in their wind collisions. In eccentric binaries, this is seen most strongly near periastron passage.
Noel D. Richardson, Andrea R. Daly, Peredur M. Williams, Grant M. Hill, Victor I. Shenavrin, Izumi Endo, André-Nicolas Chené, Nicole Karnath, Ryan M. Lau, Anthony F. J. Moffat, Gerd Weigelt   +10 more
doaj   +1 more source

Catalogue of Bright IDS Stars with Extensive Cross-Identifications

Open Astronomy, 2014
A new catalogue of bright binary stars is presented. The catalogue1 includes bright IDS systems and bright spectroscopic binaries. Besides IDS data (coordinates, relative positions, magnitudes and spectral classification), the catalogue contains ...
Lipaeva N. A., Sementsov V. N., Malkov O. Yu.   +2 more
doaj   +1 more source

Spectroscopic Binaries Among λ Bootis-type Stars [PDF]

Proceedings of the International Astronomical Union, 2011
AbstractThe small group of λ Bootis stars comprises late B to early F-type stars, with moderate to extreme (up to a factor 100) surface under-abundances of most Fe-peak elements and solar abundances of lighter elements (C, N, O, and S). The main mechanisms responsible for this phenomenon are atmospheric diffusion, meridional mixing, and accretion of ...
Olga Pintado, Ulrike Heiter, Ilian Iliev, Inga Kamp, Luciano Fraga, Ernst Paunzen, Ernst Paunzen   +6 more
openaire   +2 more sources

A Novel Approach to Produce Metal–Metal Composites by Leveraging Immiscibility: Laser Powder Bed Fusion of Nanosilver‐Dispersed Titanium

Advanced Engineering Materials, EarlyView.
Incorporating nanosized silver into titanium for antimicrobial materials exploits the metastable miscibility gap between silver and titanium. Silver nanoparticles are synthesized via pulsed laser ablation in liquid. Silver addition refines the microstructure, increases hardness by 30%, and reduces Staphylococcus capitis microbial adhesion by 70%, with ...
Hamed Shokri, Silja‐Katharina Rittinghaus, Janett Schmelzer, Jessica Bertrand, Bilal Gökce   +4 more
wiley   +1 more source

Impact of Iron Contamination on Liquid Properties and Microstructural Evolution in AlSi20

Advanced Engineering Materials, EarlyView.
Recycled aluminum is much more energy conservative and sustainable than primary aluminum. However, the iron contamination in secondary aluminum is vastly responsible for the degradation of the material properties. Herein, it is aimed to evaluate the influence of iron contamination in hypereutectic Al–Si alloy through thermodynamic as well as ...
Layla Shams Tisha, Anastasiya Toenjes, Nils Ellendt   +2 more
wiley   +1 more source

The analysis of SuperWASP photometric data for the overcontact binary QW Gem [PDF]

Serbian Astronomical Journal, 2013
The paper presents an analysis of photometric observations of the eclipsing binary QW Gem. The orbital and physical parameters of the system are derived using the modeling code by G. Djurašević.
Cséki A.
doaj   +1 more source

Radial velocity-acceleration curve analysis of the spectroscopic binary stars by the nonlinear regression [PDF]

Astrophys. Space Sci.311:435, 2007, 2005
We will introduce a new method to derive the orbital elements of the spectroscopic binary stars. Fitting the adopted radial velocity curves on the measured experimental data, the corresponding radial acceleration data are obtained. The orbital parameters are estimated by the nonlinear least squares of the radial velocity-acceleration curves.
arxiv   +1 more source

Impact of Surface Roughness on the Yield Drop of Hot‐Rolled AZX311 Mg Alloy

Advanced Engineering Materials, EarlyView.
Rough‐surfaced AZX311 Mg alloy samples have significantly lower yield strength than polished ones due to stress concentrators forming at V‐notch irregularities. Surface profilometry confirms higher Ra values for rough samples. Highest hardness values were observed near scratched surfaces, indicating strain localization effects near the rough surface ...
Hafiz Muhammad Rehan Tariq, Hyun‐Hak Kang, Umer Masood Chaudry, Muhammad Kashif Khan, Tea‐Sung Jun   +4 more
wiley   +1 more source

TYC 3340-2437-1: A Quadruple System with a Massive Star

The Astrophysical Journal
Hierarchical massive quadruple systems are ideal laboratories for examining the theories of star formation, dynamical evolution, and stellar evolution.
Jiao Li, Chao Liu, Changqing Luo, Bo Zhang, Jiang-Dan Li, Jia-Dong Li, Zhan-Wen Han, Xue-Fei Chen, Xiao-Bin Zhang, Lu-Qian Wang, Min Fang, Li-Feng Xing, Xi-Liang Zhang, Chichuan Jin   +13 more
doaj   +1 more source