Results 61 to 70 of about 10,825 (251)

Double Helical Plasmonic Antennas

Advanced Functional Materials, EarlyView.
Plasmonic double helical antennas funnel circularly polarized light to the nanoscale, offering strong chiroptical interaction and directional light emission. Extending a single helix design tool, this study combines numerical modeling with experimental validation, revealing large, broadband dissymmetry factors in the visible range.
Aleksei Tsarapkin, Luka Zurak, Krzysztof Maćkosz, Lorenz Löffler, Victor Deinhart, Ivo Utke, Thorsten Feichtner, Katja Höflich   +7 more
wiley   +1 more source

The Chemical Puzzle of Weak G-Band Stars: A Comprehensive Study of HD 54627, HD 105783, HD 198718, and HD 201557

The Astrophysical Journal
Weak G -band stars (WGBs) are a unique class of objects characterized by weak CH molecular lines in the Fraunhofer G band, indicative of a deficiency in ^12 C.
N. Holanda, T. Flaulhabe, F. Quispe-Huaynasi, A. Sonally, C. B. Pereira   +4 more
doaj   +1 more source

Possible discovery of the r-process characteristics in the abundances of metal-rich barium stars

, 2014
We study the abundance distributions of a sample of metal-rich barium stars provided by Pereira et al. (2011) to investigate the s- and r-process nucleosynthesis in the metal-rich environment. We compared the theoretical results predicted by a parametric
Cui, W. Y., Niu, P., Shi, J. R., Wang, W. J., Zhang, B., Zhao, G.   +5 more
core   +1 more source

The chemical evolution of Omega Centauri's progenitor system [PDF]

, 2007
Chemical evolution models are presented for the anomalous globular cluster Omega Centauri. After demonstrating that the chemical features of Omega Cen can not be reproduced in the framework of the closed-box self-enrichment scenario, we discuss a model ...
Antonio Sollima, Bedin, Bekki, Bekki, Bradamante, Brown, Carraro, Chabrier, Chuzhoy, Cohen, Cohen, Cunha, Dinescu, Dinescu, Donatella Romano, Elena Pancino, Fellhauer, Ferraro, Ferraro, Ferraro, Francesca Matteucci, Francesco R. Ferraro, François, François, Freeman, Freeman, Frinchaboy, Gnedin, Gratton, Gratton, Grevesse, Harbeck, Harris, Hilker, Hilker, Hirschi, Hughes, Icke, Ideta, Ikuta, Iwamoto, Kayser, Koch, Kroupa, Lanfranchi, Lanfranchi, Lee, Lee, Lloyd Evans, Maeder, Majewski, Mallia, Mannucci, Marco Limongi, Mateo, Matteucci, Matteucci, Matteucci, McWilliam, Merritt, Meylan, Meynet, Meynet, Meza, Michele Bellazzini, Moehler, Monica Tosi, Nomoto, Norris, Norris, Norris, Norris, Origlia, Pancino, Pancino, Pancino, Piotto, Platais, Recchi, Rey, Richer, Romano, Romano, Salpeter, Scalo, Schmidt, Smith, Smith, Smith, Sollima, Sollima, Sollima, Sollima, Stanford, Suntzeff, Talbot, Tinsley, Tolstoy, Tsuchiya, Tsujimoto, van de Ven, van den Hoek, Vanture, Woolley, Woosley, Wyse, Zinnecker   +106 more
core   +3 more sources

Biomass Native Structure Into Functional Carbon‐Based Catalysts for Fenton‐Like Reactions

Advanced Functional Materials, EarlyView.
This study indicates that eight biomasses with 2D flaky and 1D acicular structures influence surface O types, morphology, defects, N doping, sp2 C, and Co nanoparticles loading in three series of carbon, N‐doped carbon, and cobalt/graphitic carbon. This work identifies how these structural factors impact catalytic pathways, enhancing selective electron
Wenjie Tian, Jingkai Lin, Zhihao Tian, Selusiwe Ncube, Huayang Zhang, Emiliano Cortés, Hongqi Sun, Shaobin Wang   +7 more
wiley   +1 more source

On the origin of the helium-rich population in the peculiar globular cluster Omega Centauri

, 2009
In this contribution we discuss the origin of the extreme helium-rich stars which inhabit the blue main sequence (bMS) of the Galactic globular cluster Omega Centauri. In a scenario where the cluster is the surviving remnant of a dwarf galaxy ingested by
Donatella Romano, E. Pancino, F. Matteucci, Hilker, M. Bellazzini, M. Cignoni, M. Tosi   +6 more
core   +1 more source

Kinematics of planet-host stars and their relation with dynamical streams in the solar neighbourhood [PDF]

, 2006
We present a detailed study on the kinematics of metal-rich stars with and without planets, and their relation with the Hyades, Sirius and Hercules dynamical streams in the solar neighbourhood.
A. Ecuvillon, Asiain, Barbieri, Beirão, Bensby, Bensby, Bissantz, Bodaghee, Chakrabarty, Chen, Chereul, Chereul, De Simone, Dehnen, Dehnen, Dehnen, Dehnen, Ecuvillon, Ecuvillon, Ecuvillon, Ecuvillon, F. Pont, Famaey, Feltzing, Fuhrmann, G. Israelian, Gilli, Gonzalez, Gonzalez, Gonzalez, Gonzalez, Hoogerwerf, Høg, Ida, Israelian, Israelian, Israelian, James, Laughlin, Laws, M. Mayor, Mignard, Mishenina, Mühlbauer, N. C. Santos, Navarro, Pietrinferni, Pinsonneault, Pont, Raboud, Reid, Sadakane, Santos, Santos, Santos, Santos, Santos, Santos, Santos, Santos, Sellwood, Smith, Udry, Vauclair, Wielen   +64 more
core   +2 more sources

Defect Analysis of the β– to γ–Ga2O3 Phase Transition

Advanced Functional Materials, EarlyView.
The role of defects at all the relevant stages of the β$\beta$‐ to γ$\gamma$‐Ga2O3 polymorph transition is investigated using a multi method approach. The positron annihilation spectroscopy based results show that the defect density decreases after the transition, and that changes in defect configuration within the γ phase occur with increasing ...
Umutcan Bektas, Maciej O. Liedke, Huan Liu, Fabian Ganss, Maik Butterling, Nico Klingner, René Hübner, Ilja Makkonen, Andreas Wagner, Gregor Hlawacek   +9 more
wiley   +1 more source

Signatures of rocky planet engulfment in HAT-P-4. Implications for chemical tagging studies

, 2017
Aims. To explore the possible chemical signature of planet formation in the binary system HAT-P-4, by studying abundance vs condensation temperature Tc trends. The star HAT-P-4 hosts a planet detected by transits while its stellar companion does not have
Arancibia, M. Jaque, Flores, M., Jofré, E., Martioli, E., Petrucci, R., Saffe, C.   +5 more
core   +1 more source

Capture of field stars by giant interstellar clouds: the formation of moving stellar groups [PDF]

, 2015
In the solar neighbourhood, there are moving groups of stars with similar ages and others of stars with heterogeneous ages as the field stars. To explain these facts, we have constructed a simple model of three phases. Phase A: a giant interstellar cloud
Olano, Carlos A.
core   +3 more sources