Results 81 to 90 of about 167,710 (319)

Influence of Population III stars on cosmic chemical evolution [PDF]

, 2009
New observations from the Hubble ultra deep field suggest that the star formation rate at z>7 drops off faster than previously thought. Using a newly determined star formation rate for the normal mode of Population II/I stars (PopII/I), including this ...
Aguirre, Alvarez, Aracil, Bagla, Barton, Beers, Beers, Bessell, Bessell, Bouwens, Bromm, Bromm, Bromm, Cayrel, Christlieb, Christlieb, Collet, D. Maurin, Daigne, Daigne, Daigne, Dunkley, E. Rollinde, E. Vangioni, Ekström, F. Daigne, F. H. Vincent, Fan, Faucher-Giguère, Frebel, Frebel, Frebel, Frebel, Frebel, Greif, Greif, Greif, Greiner, Heger, Heger, Henriques, Hopkins, Iye, J. Silk, Jenkins, Johnson, Johnson, Johnson, Johnson, K. A. Olive, Kampakoglou, Karlsson, Kawai, Kirby, Kneib, Komiya, Ledoux, Madau, Maeder, Mori, Nagao, Nomoto, Norris, Oesch, Press, Prochaska, Ryan, Salvadori, Santoro, Schaerer, Schoerck, Sheth, Shigeyama, Smith, Songaila, Spergel, Springel, Stiavelli, Suda, Tanvir, Tominaga, Trenti, Tsujimoto, Tumlinson, Tumlinson, van den Hoek, Venn, Wada, Woosley, Yoshida   +89 more
core   +1 more source

Development and Preliminary In Vivo Study of 3D‐Printed Bioactive Glass Scaffolds with Trabecular Architecture

Advanced Engineering Materials, EarlyView.
This study reports the fabrication of trabecular bioactive glass scaffolds (composition “1d”: 46.1SiO2‐28.7CaO‐8.8MgO‐6.2P2O5‐5.7CaF2‐4.5Na2O wt%) through vat photopolymerization and the relevant results from mechanical testing and in vivo implantation procedures in rabbit femora, showing great promise for bone tissue engineering applications.
Dilshat Tulyaganov, Roberta Gabrieli, Avzal Akbarov, Nigora Nigmatova, Bekhzod Khabilov, Alessandro Schiavi, Martin Schwentenwein, Enrica Verné, Francesco Baino   +8 more
wiley   +1 more source

TITANS: the metal-poor reference stars

, 2021
Tracing the history of chemical evolution of the Milky Way requires the determination of chemical abundances in a large assortment of stars with accurate stellar parameters. Nonetheless, the accuracy achieved in the derived astrophysical parameters is still insufficient, mainly because of the paucity of adequate calibrators, particularly in the metal ...
Giribaldi, Riano, Smiljanic, Rodolfo, da Silva, André, Cornejo Espinoza, Deysi   +3 more
openaire   +1 more source

Is Young's Modulus a Critical Coating Property Determining Fouling‐Release Performance of Marine Coatings?

Advanced Engineering Materials, EarlyView.
The release of foulers from protective marine coatings is determined by several interrelated material properties, including the strength of Young's modulus, the flexibility of chain segments, the surface free energy, and the magnitude of hydrodynamic stress.
Johann C. Schaal, Andreas Brinkmann, Andreas Hartwig   +2 more
wiley   +1 more source

New Lithium Measurements in Metal-Poor Stars [PDF]

, 2012
We provide *lambda*6708 Li 1 measurements in 37 metal-poor stars, most of which are poorly-studied or have no previous measurements, from high-resolution and high-S/N spectroscopy obtained with the McDonald Observatory 2.1m and 2.7m telescopes.
Allen C., Axer M., Boesgaard A. M., Carlsson M., Edvardsson B., Fuhrmann K., Gratton R. G., Gratton R. G., Ishigaki M., Jeremy R. King, Lambert D. L., Marc Schaeuble, Mishenina T. V., Rebolo R., Schuster W. J., Schuster W. J.   +15 more
core   +3 more sources

Trace Nickel Activated Biphasic Core‐CuOii/Shell‐CuOi Secondary Microspheres Enable Room Temperature Parts‐Per‐Trillion‐Level NO2 Detection

Advanced Engineering Materials, EarlyView.
An idea of designing novel sensors is proposed by creating appropriate Schottky barriers and vacancies between isomorphous Core‐CuOii/ Shell‐CuOi secondary microspheres and enhancing catalytic and spill‐over effects, and electronegativity via spontaneous biphasic separation, self‐assembly, and trace‐Ni‐doping.
Bala Ismail Adamu, Peipei Chen, Shafia Mukhtar Ibrahim, Mukhtar Lawan Adam, Attia Falak, Mokhotjwa Simon Dhlamini, Hanfu Wang, Lingxiang Jiang, Weiguo Chu   +8 more
wiley   +1 more source

Investigating Non-LTE Abundances of Neodymium in Metal-poor FGK Stars

The Astrophysical Journal
The dominant site(s) of the r -process are a subject of current debate. Ejecta from r -process-enrichment events like kilonovae are difficult to directly measure, so we must instead probe abundances in metal-poor stars to constrain r -process models ...
John D. Dixon, Rana Ezzeddine, Yangyang Li, Thibault Merle, Manuel Bautista, Yanjun Guo   +5 more
doaj   +1 more source

What Do Large Language Models Know About Materials?

Advanced Engineering Materials, EarlyView.
If large language models (LLMs) are to be used inside the material discovery and engineering process, they must be benchmarked for the accurateness of intrinsic material knowledge. The current work introduces 1) a reasoning process through the processing–structure–property–performance chain and 2) a tool for benchmarking knowledge of LLMs concerning ...
Adrian Ehrenhofer, Thomas Wallmersperger, Gianaurelio Cuniberti   +2 more
wiley   +1 more source

Understanding the Early Stages of Galaxy Formation Using Very Metal-poor Stars from the Hamburg/ESO Survey

The Astrophysical Journal, 2023
We explore the chemodynamical properties of a sample of very metal-poor (VMP) stars selected from the Hamburg/ESO survey, matched with Gaia EDR3, in the phase space identified by the three integrals of motion ( L _z , E , I _3 ). Disk and halo orbits are
Daniela Carollo, Norbert Christlieb, Patricia B. Tissera, Emanuel Sillero   +3 more
doaj   +1 more source

Nucleosynthesis from massive stars 50 years after B2FH

, 2007
We review some important observed properties of massive stars. Then we discuss how mass loss and rotation affect their evolution and help in giving better fits to observational constraints.
Abbott, Abbott, Asplund, Barkana, Beers, Bessell, Binns, Bodenheimer, Bodenheimer, Bouret, Burbidge, Cameron, Carr, Carretta, Chiappini, Chiappini, Christlieb, Crowther, Crowther, Crowther, Crowther, Crowther, Cusumano, de Jager, Decressin, Dessart, Diehl, Dohm-Palmer, Domiciano de Souza, Domiciano de Souza, Domogatsky, Donati, Donati, Donati, Dufton, Dwarkadas, Eggenberger, Eldridge, Foellmi, Foellmi, Fröhlich, Fullerton, G. Meynet, Gies, González Hernández, González Hernández, Gotz, Grevesse, Hamann, Heap, Heger, Henrichs, Hirschi, Hirschi, Hirschi, Hopkins, Huang, Israelian, Keller, Kudritzki, Lamers, Langer, Leitherer, Lennon, Limongi, Lucatello, Lyubimkov, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Martayan, Massey, Mathis, McErlean, Mendel, Merrill, Meylan, Meynet, Meynet, Meynet, Meynet, Meynet, Meynet, Meynet, Meynet, Mokiem, Morel, Neiner, Neiner, Neiner, Norris, Nugis, Ohishi, Owocki, Owocki, Pelupessy, Penny, Plez, Prantzos, Prantzos, Pérez-Gonzàlez, Reeves, Schaller, Smith, Smith, Spite, Spruit, Talon, Tayler, Townsend, Tuthill, Tuthill, Ud-Doula, Umeda, van der Hucht, van der Hucht, van Loon, Veilleux, Venn, Venn, Venn, Venn, Vink, Vink, Vink, von Zeipel, Vrancken, Wisniewski, Woosley, Woosley, Woosley, Yoon, Zahn   +146 more
core   +1 more source