Results 21 to 30 of about 1,711 (227)

Anomalous diffusion of cosmic rays: A geometric approach

AIP Advances, 2021
In this work, we analyze the process leading to the occurrence of anomalous transport phenomena associated with galactic cosmic rays propagating through the interstellar space.
Salvatore Buonocore, Mihir Sen
doaj   +1 more source

Metallicity Dependence of Molecular Cloud Hierarchical Structure at Early Evolutionary Stages

The Astrophysical Journal, 2023
The formation of molecular clouds out of H i gas is the first step toward star formation. Its metallicity dependence plays a key role in determining star formation throughout cosmic history.
Masato I. N. Kobayashi, Kazunari Iwasaki, Kengo Tomida, Tsuyoshi Inoue, Kazuyuki Omukai, Kazuki Tokuda   +5 more
doaj   +1 more source

Refractive interstellar scintillation in pulsar dynamic spectra [PDF]

Monthly Notices of the Royal Astronomical Society, 1994
The evolution of the dynamic spectra of eight pulsars over 16 months is reported. Observations were made at Jodrell Bank at 408 MHz from 1984 September to 1986 January. The changing form of the spectra is interpreted as refractive modulation of diffractive interstellar scintillation.
Y. Gupta, B. J. Rickett, A. G. Lyne
openaire   +1 more source

AIMNet2‐NSE: A Transferable Reactive Neural Network Potential for Open‐Shell Chemistry

Angewandte Chemie, Volume 138, Issue 5, 28 January 2026.
AIMNet2‐NSE enables accurate modeling of open‐shell radical chemistry through neural spin‐charge equilibration (NSE). This machine learning interatomic potential predicts radical reaction energies, barriers, and spin‐crossing events with near‐DFT accuracy while offering five orders of magnitude computational speedup, making high‐throughput exploration ...
Bhupalee Kalita, Roman Zubatyuk, Dylan M. Anstine, Maike Bergeler, Volker Settels, Conrad Stork, Sebastian Spicher, Olexandr Isayev   +7 more
wiley   +2 more sources

Galactic civilizations: Population dynamics and interstellar diffusion [PDF]

Icarus, 1981
The interstellar diffusion of galactic civilizations is reexamined by potential theory; both numerical and analytical solutions are derived for the nonlinear partial differential equations which specify a range of relevant models, drawn from blast wave physics, soil science, and, especially, population biology.
William I. Newman, Carl Sagan
openaire   +1 more source

New solar modulation modeling of the galactic proton flux measured by the AMS02 and PAMELA experiments [PDF]

EPJ Web of Conferences, 2019
A thorough understanding of solar effects on the galactic cosmic rays is relevant both to infer the local interstellar spectrum characteristics and to investigate the dynamics of charged particles in the heliosphere.
Fiandrini E., Bertucci B., Tomassetti N., Khiali B.   +3 more
doaj   +1 more source

Magnetic Fields in Giant Filaments Probed by the Velocity Gradient Technique: Regular Magnetic Field Interrupted by Magnetization Gaps

The Astrophysical Journal
We study the magnetic field structures in six giant filaments associated with the spiral arms of the Milky Way by applying the velocity gradient technique (VGT) to the ^13 CO spectroscopic data from the GRS, FUGIN, and SEDIGSM surveys.
Mengke Zhao, Guang-Xing Li, Jianjun Zhou, Xindi Tang, Jarken Esimbek, Yuxin He, Dalei Li, Weiguang Ji, Zhengxue Chang, Kadirya Tursun   +9 more
doaj   +1 more source

Ultrafast Vibrational Relaxation Dynamics in XUV-Excited Polycyclic Aromatic Hydrocarbon Molecules

Physical Review X, 2021
Unraveling ultrafast molecular processes initiated by energetic radiation provides direct information on the chemical evolution under extreme conditions.
A. Boyer, M. Hervé, V. Despré, P. Castellanos Nash, V. Loriot, A. Marciniak, A. G. G. M. Tielens, A. I. Kuleff, F. Lépine   +8 more
doaj   +1 more source

Energy Landscapes in Chemical Reactions and Transport

ChemPhysChem, Volume 26, Issue 6, March 15, 2025.
Kinetics/dynamics of chemical reactivity and transport of chemical species in a solid are both determined by the energy landscape in which they take place. Discussing common grounds but also distinct differences may help in advancing the understanding in both fields.
Karl‐Michael Weitzel
wiley   +1 more source

Gradient Technique Theory: Tracing Magnetic Field and Obtaining Magnetic Field Strength

The Astrophysical Journal
The gradient technique is a promising tool with theoretical foundations based on the fundamental properties of MHD turbulence and turbulent reconnection.
Alex Lazarian, Ka Ho Yuen, Dmitri Pogosyan   +2 more
doaj   +1 more source