Results 71 to 80 of about 12,959,304 (254)

Forced Measurement of Astronomical Sources at Low Signal-to-noise

The Astronomical Journal
We propose a modified moment matching algorithm to avoid catastrophic failures for sources with a low signal to noise ratio. The proposed modifications include a method to eliminate nonphysical negative pixel values and a forced single iteration with an ...
A. Dutta, J. R. Peterson, G. Sembroski
doaj   +1 more source

Chiral Phonon–Driven Ultrafast Spin Currents in a Non‐Magnetic Ferroelectric

Advanced Materials, EarlyView.
Broadband terahertz emission spectroscopy shows signatures of ultrafast spin‐current generation in non‐magnetic ferroelectric β$\beta$’‐In2Se3${\rm In}_2{\rm Se}_3$. Reversal of the emitted field upon sample inversion and substitution of Pt with W indicates spin‐Hall‐mediated charge conversion, while polarization‐resolved measurements reveal ...
Thomas B. Gill, Ahmet Yagmur, Matthew Rogers, Luke Benson, Nathan Fox, Ben Muggleton, Zabeada Aslam, Conor McCluskey, Phoenix Robinson, Oscar Cespedes, Bryan Hickey, Timothy Moorsom, Marty Gregg, Edmund H. Linfield, Sukhdeep Dhillon, Satoshi Sasaki, Joshua R. Freeman   +16 more
wiley   +1 more source

VST processing facility: first astronomical applications [PDF]

VST–Tube is a new software package designed to process optical astronomical images. It is an automated pipeline to go from the raw exposures to fully calibrated co-added images, and to extract catalogs with aperture and PSF photometry.
Capaccioli, Massimo
core   +2 more sources

CSST Slitless Spectra: Target Detection and Classification with Yolo

The Astronomical Journal
Addressing the spatial uncertainty and spectral blending challenges in China Space Station Telescope slitless spectroscopy, we present a deep learning-driven, end-to-end framework based on the You Only Look Once (YOLO) models.
Yingying Zhou, Chao Liu, Hao Tian, Xin Zhang, Nan Li   +4 more
doaj   +1 more source

Wafer‐Scale Direct Growth of Ultraclean Monolayer Amorphous Carbon on c‐Sapphire by Remote Catalytic Dehydrogenation

Advanced Materials, EarlyView.
Remote catalytic dehydrogenation enables the direct growth of monolayer amorphous carbon on a 2‐inch sapphire wafer by thermal CVD. Spatial separation of the catalyst from the growth substrate eliminates metallic residue and post‐growth processing, yielding a wafer‐scale uniform film with a random polygonal sp2‐hybridized carbon network that exhibits ...
Muhammad Sabbtain Abbas, Imhwan Kim, Seokje Lee, Yasir Hassan, Jihwan Kim, Eunsu Lee, Han Ik Kim, Yoonkang Kim, Gyu‐Chul Yi   +8 more
wiley   +1 more source

A Formalism for Calibrating the Instrumental Polarization of Radio Interferometric Arrays at Meter Wavelengths Using Unpolarized Sky: A Demonstration Using MWA Observations

The Astrophysical Journal Supplement Series
Calibration of instrumental polarization is critical for measuring polarized radio emissions from astrophysical sources to extract the magnetic field information in astrophysical, heliospheric, and terrestrial plasmas.
Devojyoti Kansabanik, Angelos Vourlidas, Soham Dey, Surajit Mondal, Divya Oberoi   +4 more
doaj   +1 more source

AI application to artificial satellite identification in CHEOPS data

Astronomy & Astrophysics
Context. The rapid proliferation of artificial satellites poses a growing challenge to astronomical observations, calling for robust methods to flag and mitigate their impact on scientific data quality.
García-Martín Pablo, Gonçalves Luís, Hellmich Stephan, Billot Nicolas, Merín Bruno   +4 more
doaj   +1 more source

Astronomical data compression experiment

Astronomical compression experiment. Lossless and lossy compression is performed on 16-bit astronomical data.
Maireles-Gonzalez, Oscar
core   +1 more source

Historical astronomical data : urgent need for preservation, digitization enabling scientific exploration [PDF]

, 2019
Over the past decades and even centuries, the astronomical community has accumulated a significant heritage of recorded observations of a great many astronomical objects.
Webb, David, Longcope, Dana, Clette, Frédéric, Osborn, Wayne, Mursula, Kalevi, Muñoz-Jaramillo, Andres, Hill, Frank, Gibson, Sarah, Bogart, Rick, Griffin, Elizabeth, Burkepile, Joan, Kafka, Stella, Pillet, Valentín M., Bartlett, Jennifer, Stetson, Peter, Usoskin, Ilya, Hesser, James, Pevtsov, Alexei A., Grindlay, Jonathan   +18 more
core   +1 more source

Photocatalytic Water Splitting on the Lunar Surface: Prospects for In Situ Resource Utilization

Advanced Materials Interfaces, EarlyView.
Water has been found in craters on the moon nearby locations which are illuminated >80% of the time. Photocatalysis uses energy from sunlight to drive chemical reactions such as water splitting to produce oxygen and hydrogen. It is a scalable technology that requires lighter equipment and utilizes resources available on the moon. ABSTRACT The discovery
Ranjani Kalyan, Thomas D. Small, Gregory F. Metha, Mahmoud Adel Hamza, Thomas J. O'Dea, Yideng Shen, Cameron J. Shearer   +6 more
wiley   +1 more source