Results 91 to 100 of about 67,060 (301)

Non‐innocent solvents in meteorite extractions: Evidence for artifact formation

Meteoritics &Planetary Science, EarlyView.
Abstract Solvent extraction is a cornerstone of meteoritic organic and inorganic chemistry, yet the assumption that common solvents act as chemically inert media is becoming increasingly untenable. This study reports that low‐molecular‐weight alcohols, particularly methanol and ethanol, are “non‐innocent” solvents when used to extract soluble sulfur ...
N. Randazzo, R. W. Hilts, R. M. Whittal, B. Reiz, V. Olan‐Rubio, C. D. K. Herd, I. H. Krouse   +6 more
wiley   +1 more source

Photochemical N‐dealkylation of Tertiary Amines Coupled With Photocharging of Poly(Heptazine Imides)

Angewandte Chemie, Volume 138, Issue 11, 9 March 2026.
Protonated poly(heptazine imide) (H‐PHI) functions as an energy reservoir, thereby facilitating the endothermic dealkylation of triethylamine through a proton‐coupled two‐electron transfer (PC2ET) process. The extent of photocharging is quantitatively described by a molecular‐level descriptor, Ne:Nhept, providing a direct correlation between stored ...
Jingru Zhuang, Quanhao Zhang, Chong Wang, Tao Yao, Cheuk Lok Cheng, Pavlo O. Dral, Oleksandr Savateev   +6 more
wiley   +2 more sources

The 2023 Flight of the Faint Intergalactic-medium Redshifted Emission Balloon

The Astrophysical Journal Supplement Series
The second iteration of the Faint Intergalactic-medium Redshifted Emission Balloon (FIREBall-2) is a UV multiobject spectrograph designed to detect emission from the circumgalactic and circumquasar medium at low redshifts ( z < 1).
Drew M. Miles, Vincent Picouet, Zeren Lin, Ignacio Cevallos-Aleman, David Schiminovich, Nicolas Bray, Charles-Antoine Chevrier, Greyson Davis, Erika Hamden, Keri Hoadley, D. Christopher Martin, Bruno Milliard, Johan Montel, David Valls-Gabaud, Simran Agarwal, Philippe Balard, Patrick Blanchard, Harrison Bradley, Haeun Chung, Marty Crabill, Fernando Cruz Aguirre, Xihan Deng, Fabien Harmand, Catherine Hourtolle, Olivia Jones, Nazende I. Kerkeser, Aafaque R. Khan, Gillian Kyne, Jessica S. Li, Nicole Melso, Shouleh Nikzad, Julie Richard, Meghna Sitaram, Jared Termini, Jean-Noel Valdivia, Didier Vibert, Matthew Werneken   +36 more
doaj   +1 more source

The IAU recommended photometric system for ultraviolet astronomy [PDF]

, 2023
Ana I. Gómez de Castro, N. Brosch, D. Bettoni, Leire Beitia-Antero, Paul A. Scowen, D. Valls‐Gabaud, Mikhail Sachkov   +6 more
openalex   +1 more source

O/Fe in metal-poor main sequence and subgiant stars

, 2002
A study of the O/Fe ratio in metal-poor main sequence and subgiant stars is presented using the [OI] 6300A line, the OI 7774A triplet, and a selection of weak FeII lines observed on high-resolution spectra acquired with the VLT UVES spectrograph. The [OI]
Asplund, M., Lambert, D. L., Nissen, P. E., Primas, F.   +3 more
core   +1 more source

Massive photinos and ultraviolet astronomy

Physics Letters B, 1982
Abstract The ionisation of hydrogen and helium in the intergalactic medium and of silicon and carbon in galactic halos, including our own, have already tentatively been attributed to photons emitted by decaying neutrinos created in the hot big bang. This hypothesis would require a neutrino mass ∼ 100 eV and a radiative lifetime ∼ 10 27 s.
openaire   +1 more source

International Ultraviolet Explorer (IUE) Post Launch Report 2 [PDF]

The International Ultraviolet Explorer (IUE), an Explorer class ultraviolet astronomy mission, is an international cooperative program between the United States, the United Kingdom (UK), and the European Space Agency (ESA) which provides for a single ...

core   +1 more source

Universal Time Influence on Stormtime Magnetosphere Ionosphere Coupling

AGU Advances, Volume 7, Issue 2, April 2026.
Abstract The offset between Earth's magnetic and rotational axes introduces a diurnal dependence in the high‐latitude EUV exposure of the northern hemisphere (NH) and southern hemisphere (SH). This variation raises the question: Does the Universal Time (UT) of geomagnetic storm onset impact its geospace consequences?
Kalpesh Ghag, William Lotko, Kevin Pham, Dong Lin, Viacheslav Merkin, Anil Raghav, Michael Wiltberger   +6 more
wiley   +1 more source

Radio Pulse Power Distribution of Lightning in Jupiter's 2021–2022 Stealth Superstorms

AGU Advances, Volume 7, Issue 2, April 2026.
Abstract Surveys and observations of lightning on Jupiter prior to the NASA Juno mission used night‐side imaging approaches, and a common conclusion was that the optical energy was similar to the highest energy terrestrial lightning flashes, or superbolts.
Michael H. Wong, Ivana Kolmašová, Fabiano A. Oyafuso, Masafumi Imai, Shinji Mizumoto, Steven M. Levin, Ramanakumar G. Sankar, Amy A. Simon, Shawn Brueshaber, Glenn S. Orton, Sushil K. Atreya, Cheng Li, Scott J. Bolton   +12 more
wiley   +1 more source

Lyman Continuum Leakers in the AstroSat Ultraviolet Deep Field: Extreme-ultraviolet Emitters at the Cosmic Noon

The Astrophysical Journal Letters
We report the direct detection of Lyman continuum (LyC) emission from nine galaxies and one active galactic nucleus at z ∼ 1.1–1.6 in the GOODS-North field using deep observations from the Ultraviolet Imaging Telescope (UVIT) on board AstroSat.
Suraj Dhiwar, Kanak Saha, Soumil Maulick, Brent M. Smith, Chayan Mondal, Harry I. Teplitz, Marc Rafelski, Rogier A. Windhorst   +7 more
doaj   +1 more source