Results 111 to 120 of about 12,886 (274)

Large Depth‐of‐Field, Large Eyebox, and Wide Field‐of‐View Freeform‐Holographic Augmented Reality Near‐Eye Display

Advanced Science, EarlyView.
This study proposes an augmented reality (AR) near‐eye display system that simultaneously achieves a large depth‐of‐field (DOF) from 0.25 to 10 m, a wide 50° field‐of‐view (FOV), and a 10 mm × 10 mm viewing eyebox, while maintaining high display performance, good optical see‐through viewing capability, and a compact system form factor.
Yongdong Wang, Tong Yang, Xin Lyu, Dewen Cheng, Yongtian Wang   +4 more
wiley   +1 more source

A proper motion study of the globular cluster M55

, 2011
We have derived the absolute proper motion (PM) of the globular cluster M55 using a large set of CCD images collected with the du Pont telescope between 1997 and 2008. We find (PM_RA*cos(DEC), PM_DEC) = (-3.31 +/- 0.10, -9.14 +/- 0.15) mas/yr relative to
Anderson, Bellini, Clement, Dinescu, Dinescu, Harris, I. B. Thompson, Ibata, Ibata, J. Kaluzny, K. Zloczewski, Kaluzny, Kaluzny, Lanzoni, Mateo, Montalto, Olech, Peng, Platais, Platais, Pryor, Pych, Sollima, Stetson, Yadav, Zacharias   +25 more
core   +1 more source

A MegaCam Survey of Outer Halo Satellites. VI: The Spatially Resolved Star Formation History of the Carina Dwarf Spheroidal Galaxy [PDF]

, 2016
We present the spatially resolved star formation history (SFH) of the Carina dwarf spheroidal galaxy, obtained from deep, wide-field g,r imaging and a metallicity distribution from the literature.
Côté, Patrick, de Boer, T. J. L., Djorgovski, S. G., Geha, Marla, Guzmán, Andrés E., Muñoz, Ricardo R., Santana, Felipe A., Simon, Joshua D., Stetson, Peter   +8 more
core   +3 more sources

High‐Speed Design of Multiplexed Meta‐Optics Enabled by Physics‐Driven Self‐Supervised Network

Advanced Science, EarlyView.
A physics‐driven self‐supervised network (PDSS‐Net) is proposed for high‐speed, iteration‐free design of multiplexed meta‐optics. By learning a direct mapping from holographic targets to all meta‐atom structures, PDSS‐Net achieves a 1000× speedup over traditional optimization methods in designing 2K RGB meta‐holograms.
Yuqing He, Sheng Ye, Yue Han, Mingna Xun, Qiang Li, Ruiqi Wang, Qihuang Gong, Yan Li   +7 more
wiley   +1 more source

Low‐Frequency Microwave Absorption Composites

Advanced Science, EarlyView.
The microwave absorption principles and low‐frequency performance factors are briefly introduced. Recent progress is systematically summarized in five different based composites. Then detailed analysis focuses on relationships and mechanisms about micro‐structure and macro‐performance.
Mukun He, Kaiyu Zhang, Hua Qiu, Hua Guo, Xiangcheng Li, Yongqiang Guo, Yali Zhang, Junwei Gu   +7 more
wiley   +1 more source

WIYN Open Cluster Study. XC. Radial-velocity Measurements and Spectroscopic Binary Orbits in the Open Cluster NGC 2506

The Astronomical Journal
NGC 2506 is a rich, intermediate-age (2.0 Gyr), metal-poor ([Fe/H] ∼ −0.2) open cluster. This work presents the results of 12,157 spectroscopic radial-velocity measurements of 2442 stars in the NGC 2506 field obtained over 41 yr, made as part of the WIYN
Evan Linck, Robert D. Mathieu, David W. Latham   +2 more
doaj   +1 more source

Models of Individual Blue Stragglers

, 2014
This chapter describes the current state of models of individual blue stragglers. Stellar collisions, binary mergers (or coalescence), and partial or ongoing mass transfer have all been studied in some detail.
A. Hypki, A. Maeder, A. Procter Sills, A. Sills, A. Sills, A. Sills, A. Sills, A. Sills, A. Sills, B. Tian, C. A. Nelson, C. D. Bailyn, D. Lauterborn, E. Gaburov, E. Glebbeek, E. Glebbeek, E. Glebbeek, E. Glebbeek, E. L. Sandquist, F. D’Antona, J. A. Ouellette, J. C. Lombardi Jr, J. C. Lombardi Jr, J. C. Lombardi Jr, J. G. Hills, J. R. Hurley, K. Belczynski, M. Templeton, N. Ivanova, N. Ivanova, P. J. T. Leonard, P. Lu, P. Santolamazza, R. E. Cohen, R. Kippenhahn, S. Chatterjee, S. D. Kawaler, S. F. Portegies Zwart, S. J. Aarseth, S. Matt, S. Portegies Zwart, W. Benz, X. Chen, X. Chen, X. Chen   +44 more
core   +1 more source

Search for blue straggler stars in open clusters from the VVV survey (preliminary result)

Journal of Physics: Conference Series, 2019
Blue straggler stars (BSS) are a group of stars that are found within some stellar clusters through their color-magnitude diagrams (CMDs). The BSS are located on the upper-part of the CMD’s tum-off (TO) point along the zero-age main sequence (ZAMS) line.
S. Amalina, M. I. Arifyanto
semanticscholar   +1 more source

High‐Density Flexible Neural Implants with Submicron Feedline Resolution

Advanced Electronic Materials, EarlyView.
Optimization of microfabrication methods using optical contact lithography (OCL) and electron beam lithography (EBL) enables the fabrication of 64‐channel, high‐density, parylene‐C‐based intracortical implants with submicron feedlines as narrow as 400 and 50 nm, respectively.
Lina Koschinski, Thomas Grap, Erkan Yilmaz, Marius Kleutgens, Simon Decke, Martin Kasavetov, Marie Jung, Alejandro Carnicer‐Lombarte, George Malliaras, Andreas Offenhäusser, Viviana Rincón Montes   +10 more
wiley   +1 more source

The Power of High-precision Broadband Photometry: Tracing the Milky Way Density Profile with Blue Horizontal Branch Stars in the Dark Energy Survey

The Astrophysical Journal
Blue horizontal branch stars (BHBs), excellent distant tracers for probing the Milky Way’s halo density profile, are distinguished in the ${\left(g-r\right)}_{0}$ versus ( i − z ) _0 color space from another class of stars, blue straggler stars.
Fengqing Yu, Ting S. Li, Joshua S. Speagle, Gustavo E. Medina, Sergey E. Koposov, Joss Bland-Hawthorn, Lara R. Cullinane, Gwendolyn M. Eadie, Denis Erkal, Geraint F. Lewis, Guilherme Limberg, Daniel B. Zucker   +11 more
doaj   +1 more source