Results 41 to 50 of about 52,830 (299)

Osservazioni astronomiche con veicoli spaziali

Annals of Geophysics, 1963
A survey is given on the most important astronomical<br />and astrophysical problema, and expecially the solar ones, which need an<br />essential contribution from observations made by artiflcial satellites.
M. CIMINO
doaj   +1 more source

Polarization Criterion in Targeted SETI Observation

The Astronomical Journal, 2023
In this paper, we propose a novel method for distinguishing extraterrestrial intelligence (ETI) signals from radio frequency interference (RFI) by leveraging polarization features.
Jian-Kang Li, Yu Chen, Bo-Lun Huang, Zhen-Zhao Tao, Xiao-Hang Luan, Xiao-Hui Sun, Tong-Jie Zhang, Vishal Gajjar   +7 more
doaj   +1 more source

Performance of the Imaging Fourier Transform Spectrometer with Photoconductive Detector Arrays: An Application for the AKARI Far-Infrared Instrument

, 2008
We have developed an imaging Fourier transform spectrometer (FTS) for space-based far-infrared astronomical observations. The FTS employs a newly developed photoconductive detector arrays with a capacitive trans-impedance amplifier, which makes the FTS a
DOI, Yasuo, KANEDA, Hidehiro, KAWADA, Mitsunobu, MATSUO, Hiroshi, MATSUURA, Shuji, MURAKAMI, Noriko, NAKAGAWA, Takao, OKADA, Yoko, OOTSUBO, Takafumi, SHIBAI, Hiroshi, SHIRAHATA, Mai, TAKAHASHI, Hidenori, YASUDA, Akiko, 中川, 貴雄, 土井, 靖生, 大坪, 貴文, 安田, 晃子, 岡田, 陽子, 川田, 光伸, 村上, 紀子, 松尾, 宏, 松浦, 周二, 白旗, 麻衣, 芝井, 広, 金田, 英宏, 高橋, 英則   +25 more
core   +1 more source

On-sky speckle nulling demonstration at small angular separation with SCExAO [PDF]

, 2014
This paper presents the first on-sky demonstration of speckle nulling, which was achieved at the Subaru Telescope in the context of the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) Project.
Clergeon, Christophe, Currie, Thayne, Guyon, Olivier, Jovanovic, Nemanja, Kudo, Tomoyuki, Martinache, Frantz, McElwain, Michael, Singh, Garima, Tamura, Motohide, Thalmann, Christian   +9 more
core   +5 more sources

Evidence for Itinerant Ferromagnetic Flat Bands Producing Large Transverse Responses

Advanced Materials, EarlyView.
Itinerant ferromagnetic flat bands are demonstrated in GdCo5 with a high Curie temperature of 940K, a stacked honeycomb–kagome lattice, through angle‐resolved photoemission spectroscopy and magneto‐thermoelectric measurements. These topological flat bands generate large Berry curvaturte, producing gigantic anomalous Nernst effect with record‐high ...
Susumu Minami, Yangming Wang, Seigo Souma, Hiroto Nakamura, Akito Sakai, Takumi Osumi, Hang Su, Hikaru Watanabe, Shun'ichiro Kurosawa, Rikuto Oiwa, Daisuke Nishio‐Hamane, Kosuke Nakayama, Takuya Nomoto, Ryotaro Arita, Takafumi Sato, Satoru Nakatsuji   +15 more
wiley   +1 more source

Characterization of an Optical Transfer Function–based Phasing Technique for India’s Large Segmented Mirror Telescope

The Astronomical Journal
The upcoming 10 m class large Indian telescope is proposed to be built using segmented mirror technology. To achieve diffraction-limited image quality with a segmented mirror telescope, it is important to phase mirror segments with very high precision ...
Radhika Dharmadhikari, Padmakar Parihar
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Astrophotonic Spectrographs

Applied Sciences, 2019
Astrophotonics is the application of photonic technologies to channel, manipulate, and disperse light from one or more telescopes to achieve scientific objectives in astronomy in an efficient and cost-effective way.
Pradip Gatkine, Sylvain Veilleux, Mario Dagenais   +2 more
doaj   +1 more source

Twin High-Resolution, High-Speed Imagers for the Gemini Telescopes: Instrument Description and Science Verification Results

Frontiers in Astronomy and Space Sciences, 2021
Two new imaging instruments, ‘Alopeke and Zorro, were designed, built, and commissioned at the Gemini-North and Gemini-South telescopes in 2018 and 2019, respectively. Here we describe them and present the results from over a year of operation.
Nicholas J. Scott, Steve B. Howell, Crystal L. Gnilka, Andrew W. Stephens, Ricardo Salinas, Rachel A. Matson, Elise Furlan, Elliott P. Horch, Mark E. Everett, David R. Ciardi, Dave Mills, Emmett A. Quigley   +11 more
doaj   +1 more source

Miniature exoplanet radial velocity array I: design, commissioning, and early photometric results [PDF]

, 2015
The MINiature Exoplanet Radial Velocity Array (MINERVA) is a US-based observational facility dedicated to the discovery and characterization of exoplanets around a nearby sample of bright stars.
Barnes, Stuart I., Beatty, Thomas G., Blake, Cullen H., Bottom, Michael, Criswell, Stephen, de Vera, Jon, Eastman, Jason, Falco, Emilio, Gardner, Paul, Gibson, Steven R., Hedrick, Richard, Herzig, Erich, Hjelstrom, Annie, Ivarsen, Kevin, Johnson, John A., Lin, Brian, McCrady, Nate, Muirhead, Philip S., Myles, Justin, Nava, Chantanelle, Plavchan, Peter, Riddle, Reed, Robinson, Connor, Sliski, David H., Swift, Jonathan J., Szentgyorgyi, Andrew, Wittenmyer, Robert A., Wright, Jason T., Zhao, Ming   +28 more
core   +6 more sources

Self‐Powered Flexible Triboelectric‐Gated Ion‐Gel Transistor for Neuromorphic Tactile Sensing and Human Activity Recognition

Advanced Materials, EarlyView.
A fully flexible ion‐gel‐gated graphene‐channel transistor driven by a triboelectric nanogenerator enables self‐powered tactile sensing and synaptic learning. Mimicking spike‐rate‐dependent plasticity, the device exhibits frequency‐selective potentiation and depression, supporting rate‐coded neuromorphic computation even under flex.
Hanseong Cho, Seoyeon Park, Youngmin Lee, Sejoon Lee   +3 more
wiley   +1 more source