Results 41 to 50 of about 1,740 (183)

The mass spectrum of interstellar clouds [PDF]

International Astronomical Union Colloquium, 1989
AbstractThe abundance of 21-cm absorption lines seen in surveys at high latitudes can be translated into a line of sight abundance of clouds vs. column density using an empirical relationship between temperature and optical depth. As VLA surveys of 21-cm absorption at low latitudes are now becoming available, it is possible to study the variation of ...
John M. Dickey, Robert W. Garwood
openaire   +1 more source

Cluster Models for Next‐Generation, Machine‐Learning‐Based Energy Functions for Molecular Simulations

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, Meenu Upadhyay, Eric D. Boittier, Kham Lek Chaton, Valerii Andreichev, Mike Devereux, Raidel Martin Barrios, Shimoni Patel, Sena Aydin, Kai Töpfer, Markus Meuwly   +10 more
wiley   +1 more source

Complex K: Supernova Origin of Anomalous-velocity H i Structure

The Astrophysical Journal
We address one of the lingering mysteries of high-velocity clouds: If the anomalous negative velocities are the result of the approaching gas from old supernovae, then where are the receding counterparts of the expanding shells?
G. L. Verschuur, J. T. Schmelz, A. Escorza, A. Jorissen   +3 more
doaj   +1 more source

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, R. C. Ogliore, P. J. Wozniakiewicz   +2 more
wiley   +1 more source

Revisiting CN− Formation Mechanisms in Electron Collisions with Benzonitrile

ChemPhysChem, Volume 27, Issue 1, January 2026.
This study explores negative ion formation via electron attachment, revealing CN− formation at 3.0 and 7–10 eV. Dissociation pathways are analyzed using G4(MP2) and CASPT2 calculations, highlighting the coupling between the π4* and σ* resonances critical for interstellar chemistry. Radiation‐induced processes in the aromatic cyano compound benzonitrile
Rodrigo Rodrigues, Mónica Mendes, Daniel Bou‐Debes, João Ameixa, Ali Kamali, Oddur Ingólfsson, Samuel Eden, Lucas M. Cornetta, Filipe Ferreira da Silva   +8 more
wiley   +1 more source

Mapping Galactic Dust Emission and Extinction with H I, H II, and H2

The Astrophysical Journal
Neutral hydrogen (H i ) emission closely traces the dust column density at high Galactic latitudes and is thus a powerful tool for predicting dust extinction. However, the relation between H i column density N _HI and high-latitude dust emission observed
Yun-Ting Cheng, Brandon S. Hensley, Tzu-Ching Chang, Olivier Doré   +3 more
doaj   +1 more source

Interstellar Migration, the Population ‘Problem’ and the Climate Emergency

Critical Quarterly, EarlyView.
Anna Hartnell
wiley   +1 more source

Exploring the Effects of Reduced Gravitational Field Impacts on Convective Heat Transfer: A Comprehensive Review

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, Muhammad Ashraf, A. M. Rashad, Ali J. Chamkha   +3 more
wiley   +1 more source

Entropy Export and Chemical Reactions in Plasmas

Plasma Processes and Polymers, Volume 23, Issue 1, January 2026.
In a non‐equilibrium plasma, energy is transferred to molecules by electron‐impact (1), collisions among excited molecules (2), and Joule heating (3). The entropy balance for this open system relates the energy available per molecule to changes in entropy, which determines plasma‐based gas conversion. ABSTRACT Is plasma truly a “fourth state of matter”?
Dirk Hegemann, Ramses Snoeckx
wiley   +1 more source

Tracing the Layers of Photodissociated Gas in the Trifid Nebula

The Astrophysical Journal
Photodissociated gas bears the signature of the dynamical evolution of the ambient interstellar medium impacted by the mechanical and radiative feedback from an expanding H ii region.
Bhaswati Mookerjea, Göran Sandell
doaj   +1 more source