Results 31 to 40 of about 470 (131)
Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.Abstract Xenon (Xe) is a heavy noble gas with intriguing chemical properties, such as having several stable isotopes and the ability to form compounds under extreme conditions. Despite the predictions based on cosmochemical models that suggest xenon should be relatively abundant in planetary reservoirs, empirical data indicate a significant depletion ...
Avinash Kumar Both +2 more
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Detection of C3in Diffuse Interstellar Clouds [PDF]
The Astrophysical Journal, 2001 The smallest polyatomic carbon chain, C$_{3}$, has been identified in interstellar clouds (A$_{v}\sim$1 mag) towards $ζ$ Ophiuchi, 20 Aquilae, and $ζ$ Persei by detection of the origin band in its $A^{1}Π_{u}-X^{1}Σ^{+}_{g}$ electronic transition, near 4052Å.
Maier, J. P. +3 more
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Astronomische Nachrichten, Volume 347, Issue 3, March 2026.ABSTRACT Planetary nebulae represent a late evolutionary phase of low‐ to intermediate‐mass stars. In this article, we present the serendipitous discovery of a previously unknown, faint potential Galactic planetary nebula (PN) in the constellation Camelopardalis, identified during a survey‐inspection, aiming at the detection of dwarf companions of the ...
W. E. Celnik +12 more
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Diffuse interstellar bands and cloud density [PDF]
Monthly Notices of the Royal Astronomical Society, 1988 Il est demontre que les forces des caracteristiques d'absorption a λλ4430 et 5780 sont independantes des quantites en relation a la densite des nuages interstellaires. Il est demontre que des resultats anterieurs qui suggeraient de telles relations sont errones suite a l'omission de valeurs non nulles a E(B-V)=0 dans les analyses de ...
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Confined Chemistry in Space: Zeolite‐Supported Fe13 Nanoclusters Modulate CS Reactivity
Small Structures, Volume 7, Issue 3, March 2026.The study explores how an Fe13 cluster confined in chabazite reshapes the reaction of CS and H2 under astrochemical conditions. Confinement promotes C–S bond cleavage over hydrogenation, directing chemistry toward CH4 and H2S formation. Additional CS enables CS2 and C2 species. Microkinetic analysis identifies protoplanetary environments where zeolites
Gerard Pareras, Albert Rimola
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Small Structures, Volume 7, Issue 2, February 2026.This work describes how to conceive validated mixed machine learned/empirical energy functions based on finite‐sized molecular clusters for condensed phase simulations. Energy functions for pure and heterogeneous systems are one of the backbones for molecular simulation of condensed phase systems.
JingChun Wang +10 more
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A search for interstellar NaH in diffuse clouds
The Astrophysical Journal, 1977 The paper reports on a search for the (8, 0) R(0) line of the A-X transition of NaH at 3990.88 A toward Zeta Oph and Sigma Sco, which was performed using a spectroscopic photoelectric imaging Fabry-Perot interferometer at the coude focus of a 2.2-m telescope.
T. P., Jr. Snow, W. H. Smith
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Models of the o Per diffuse interstellar cloud [PDF]
Monthly Notices of the Royal Astronomical Society, 1993 We develop a model of the diffuse interstellar cloud along the line of sight to o Per. The model comprises a region of gas in equilibrium, under the action of the background radiation field, a C-type shock and post-shock gas. With the exception of CH, the observed column densities of a range of atomic and molecular species, including CH + and H 2 (J=
E. L. Heck +4 more
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Sampling the volcanic plumes at Io: Impact speeds and shock conditions
Meteoritics &Planetary Science, Volume 61, Issue 2, Page 241-271, February 2026.Abstract The desire to sample material from the interior of Io, by flying through its volcanic plumes, requires consideration of the flyby speed and the types of sample collection techniques that can be utilized. Low speed collection (1–2.5 km s−1) would require an orbit around Io itself, which is unlikely due to the accumulated radiation dose that ...
M. J. Burchell +2 more
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Heat Transfer, Volume 55, Issue 1, Page 764-774, January 2026.ABSTRACT This review explores the impact of gravitational instability on convective heat transfer, integrating existing research results and theoretical models. Gravitational instability is vital in promoting or hindering convective actions in different systems, such as atmospheric events, ocean currents, and industrial processes.
Hossam A. Nabwey +3 more
wiley +1 more source