Results 91 to 100 of about 72,602 (336)

Evolutionary sequences for horizontal branch stars

The Astrophysical Journal Supplement Series, 1987
A new grid of canonical evolutionary horizontal branch (HB) sequences is presented. Sequences are computed for each combination of the following helium and heavy-element abundances, respectively: Y(main sequence) = 0.20, 0.25, 0.30, and Z = 0.0001, 0.001, and 0.01.
openaire   +1 more source

Rapid Fabrication of Self‐Propelled and Steerable Magnetic Microcatheters for Precision Medicine

Advanced Materials, EarlyView.
A rapid Joule heating fabrication method for the production of self‐propelling, adaptive microcatheters, with tunable stiffness and integrated microfluidic channels is presented. Demonstrated through three microrobotic designs, including a steerable guiding catheter, an untethered wave‐crawling TubeBot, and a distal‐end propelled microcatheter, it was ...
Zhi Chen, Boris Rivkin, David Castellanos‐Robles, Ivan Soldatov, Lukas Beyer, Mariana Medina‐Sánchez   +5 more
wiley   +1 more source

The connection between missing AGB stars and extended horizontal branches

, 2010
Recent surveys confirm early results about a deficiency or even absence of CN-strong stars on the asymptotic giant branch (AGB) of globular clusters (GCs), although with quite large cluster-to-cluster variations.
A. Bragaglia, Bertelli, Brown, Buzzoni, Campbell, Caputo, Carretta, Carretta, Carretta, Castellani, Castellani, D’Cruz, E. Carretta, Frogel, Gratton, Greggio, Harris, Lee, Mallia, Marigo, Moehler, Norris, Paczynski, Pilachowski, Piotto, R. G. Gratton, Reimers, Renzini, Ripepi, Rosenberg, Rosenberg, S. Lucatello, Smith, Sneden, Sweigart, V. D’Orazi, Ventura   +36 more
core   +1 more source

Remorphable Architectures: Reprogramming Global Bistability through Locally Bistable Metamaterials

Advanced Materials, EarlyView.
Local bistable reconfiguration in mechanical metamaterials is leveraged in globally bistable architectures to enable in situ reprogrammable transition pathways through state flip of individual building blocks. The local‐to‐global correspondence of instabilities empowers soft robotic systems with on‐demand morphing traits, as well as aerospace ...
Lei Wu, Shujia Chen, Ali Elias Acha, Damiano Pasini   +3 more
wiley   +1 more source

Microscopic Insights into Magnetic Warping and Time‐Reversal Symmetry Breaking in Topological Surface States of Rare‐Earth‐Doped Bi2Te3

Advanced Materials, EarlyView.
Magnetic doping of the topological insulator Bi2Te3 with erbium adatoms induces out‐of‐plane magnetism and breaks time‐reversal symmetry, opening a Dirac gap and driving a Fermi surface transition from hexagonal to star‐of‐David geometry. Microscopy, spectroscopy, and magnetic dichroism reveal atomically controlled magnetic interactions that tailor the
Beatriz Muñiz Cano, Fabián Calleja, Ji Dai, Massimo Tallarida, Vera Marinova, Alessandro Barla, Marc G. Cuxart, Pierluigi Gargiani, Gonzalo N. Molina, José Angel Silva‐Guillén, Adriana I. Figueroa, Kevin García‐Díez, Sergio O. Valenzuela, Aitor Mugarza, Amadeo L. Vázquez de Parga, Rodolfo Miranda, Francisco Guinea, Manuela Garnica, Miguel A. Valbuena   +18 more
wiley   +1 more source

Transistor‐Level Activation Functions via Two‐Gate Designs: From Analog Sigmoid and Gaussian Control to Real‐Time Hardware Demonstrations

Advanced Materials, EarlyView.
Screen gate‐based transistors are presented, enabling tunable analog sigmoid and Gaussian activations. The SA‐transistor improves MRI classification accuracy, while the GA‐transistor supports precise Gaussian kernel tuning for forecasting. Both functions are implemented in a single device, offering compact, energy‐efficient analog AI processing ...
Junhyung Cho, Youngmin Han, Won Woo Lee, Youngwoo Yoo, Kannan Udaya Mohanan, Chang‐Hyun Kim, Junhwan Choi, Young‐Joon Kim, Wonjun Shin, Hocheon Yoo   +9 more
wiley   +1 more source

The Hβ Index and the Ages of Old Stellar Systems [PDF]

Journal of Astronomy and Space Sciences, 1998
The Hβ and some metal line indices, such as Mg2, Fe52, Fe53 of single-age and single-metallicity populations are computed based on the method of evolutionary population synthesis, with careful consideration of the variation of the horizontal-branch ...
Seok-Jin Yoon, Hyun-Chul Lee, Young-Wook Lee   +2 more
doaj  

The peculiar horizontal branch morphology of the Galactic globular clusters NGC 6388 and NGC 6441: new insights from UV observations [PDF]

, 2007
Context. In this paper we present multiband optical and UV Hubble Space Telescope photometry of the two Galactic globular clusters NGC 6388 and NGC 6441. Aims.
Busso, G., Cassisi, S., Castellani, M., Catelan, M., Djorgovski, S. G., Piotto, G., Recio Blanco, A., Renzini, A., Romaniello, M.   +8 more
core  

Chiral Acoustic Phonon and Conservation of Pseudoangular Momentum in α‐Quartz

Advanced Materials, EarlyView.
Chiral acoustic phonons in α‐quartz are probed via Brillouin light scattering, exploiting the photon's helicity and the crystal's handedness. The interaction obeys a selection rule arising from pseudoangular momentum conservation, enabling direct optical access to phonon chirality in nonsymmorphic crystals.
Changsoo Kim, In‐Kook Hwang, Kyoung‐Woong Moon, Kyongmo An, Kyung‐Jin Lee, Jae‐Hyeon Ko, Byong‐Guk Park, Kwang‐Yong Choi, Chanyong Hwang   +8 more
wiley   +1 more source

Light-Element Abundance Variations at Low Metallicity: the Globular Cluster NGC 5466

, 2010
We present low-resolution (R~850) spectra for 67 asymptotic giant branch (AGB), horizontal branch and red giant branch (RGB) stars in the low-metallicity globular cluster NGC 5466, taken with the VIRUS-P integral-field spectrograph at the 2.7-m Harlan J.
Bond, Briley, Cohen, Demarque, Denissenkov, Dierckx, Dotter, Eggleton, Fusi Pecci, Graeme H. Smith, Gratton, Harbeck, Hinkle, Howard E. Bond, Joshua Adams, Lee, Lee, Martell, Matthew Shetrone, Michael H. Siegel, Piotto, Plez, Rachel Wilkerson, Ramirez, Sarah L. Martell, Siegel, Siegel, Smith   +27 more
core   +1 more source