Results 81 to 90 of about 3,496,469 (217)

Photochemical effects of Mars‐like UV irradiation on carboxylic acids in carbonaceous chondrites and expectations for abiotic background organics on Mars

Meteoritics &Planetary Science, Volume 61, Issue 10, Page 2445-2465, October 2026.
Abstract In the search for life on Mars, understanding the origin of preserved organics is critical. Expected sources include exogenous delivery, endogenous synthesis, and potentially life. Environmental processing by ultraviolet (UV) irradiation can alter these organics, obscuring hallmarks of their origin. To deconvolve these effects, we conducted an
D. K. Buckner, J. C. Aponte, A. C. Schuerger, D. I. Foustoukos, F. Seguin, M. B. Wilhelm, G. Cooper, A. J. Williams   +7 more
wiley   +1 more source

The First Magnetic Fields

, 2011
We review current ideas on the origin of galactic and extragalactic magnetic fields. We begin by summarizing observations of magnetic fields at cosmological redshifts and on cosmological scales.
Rudolf A. Treumann, Schleicher, Dominik R. G., Subramanian, Kandaswamy, Lawrence M. Widrow, Dominik R. G. Schleicher, Widrow, Lawrence M., Kandaswamy Subramanian, Christos G. Tsagas, Ryu, Dongsu, Tsagas, Christos G., Dongsu Ryu, Treumann, Rudolf A., Treumann, R. ~A., Ryu, D., Tsagas, C. ~G., Subramanian, K., Widrow, L. ~M., Schleicher, Dominik Reinhold Georg   +17 more
core   +1 more source

Effects of simulated cosmological magnetic fields on the galaxy population [PDF]

, 2015
We investigate the effects of varying the intensity of the primordial magnetic seed field on the global properties of the galaxy population in ideal magnetohydrodynamic cosmological simulations performed with the moving-mesh code arepo.
Marinacci F, Marinacci, Federico, Vogelsberger M, Vogelsberger, Mark   +3 more
core   +1 more source

Towards Exascale Simulations of the ICM Dynamo with WENO-Wombat

Galaxies, 2018
In galaxy clusters, modern radio interferometers observe non-thermal radio sources with unprecedented spatial and spectral resolution. For the first time, the new data allows to infer the structure of the intra-cluster magnetic fields on small scales via
Julius Donnert, Hanbyul Jang, Peter Mendygral, Gianfranco Brunetti, Dongsu Ryu, Thomas Jones   +5 more
doaj   +1 more source

Magnetic Fields in Irregular Galaxies [PDF]

, 2008
Magnetic fields are an important component of the interstellar medium, especially in low-mass galaxies like irregulars where the magnetic pressure may be significant. However, few irregular galaxies have observed magnetic field structures. Using the VLA, the GBT, and the ATCA, we have observed several irregular galaxies in the radio continuum to ...
Kepley, Amanda A., Muehle, Stefanie, Wilcots, Eric M., Everett, John, Zweibel, Ellen, Robishaw, Timothy, Heiles, Carl   +6 more
openaire   +2 more sources

Cosmic Radiation Dose‐Rates for Civil Aviation in the Middle East: Vertical Structure, Solar Modulation, and Comparison With Models

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 17, 16 September 2026.
Abstract High‐altitude balloon measurements were conducted over southern Israel (30°35′N, 34°45′E; 850 m a.s.l., geomagnetic rigidity cutoff 10.3 GV) to characterize the vertical profiles of atmospheric ionization and radiation up to ∼35 km. Six balloon launches between October 2014 and August 2016 recorded the variability of atmospheric ionization ...
Roy Yaniv, Yoav Yair, Colin Price
wiley   +1 more source

Simulations Exploring Magnetic Fields in Spiral Galaxies

Magnetism affects all scales in astrophysics because regular matter in the Universe is mostly ionized and couples to magnetic fields. Galaxy evolution entails many unanswered questions surrounding magnetic fields, including how they affect the flow and
Robinson, Hector
core   +2 more sources

Bronchoscopy Robot with Enhanced Flexibility and Stability via Multi‐Segment Variable Stiffness Catheter

Advanced Intelligent Systems, Volume 8, Issue 9, September 2026.
This work presents a magnetic bronchoscopy robot with a novel multi‐segment variable stiffness catheter. This catheter can not only move flexibly in the narrow bronchi but also harden according to the need to provide support. Combined with remote wireless magnetic field drive, it provides a more precise and effective solution for biopsy of deep lung ...
Shucong Yin, Bin Huang, Shiyuan Dong, Junhao Wang, Liangshen Zhao, Yang Yang, Bingkun Bao, Hongen Liao, Fang Chen, Tianqi Huang, Boyu Zhang   +10 more
wiley   +1 more source

Star Formation and Magnetic Field Amplification due to Galactic Spirals

The Astrophysical Journal
We use global MHD galaxy simulations to investigate the effects of spiral arms on the evolution of magnetic fields and star formation within a self-regulated interstellar medium.
Hector Robinson, James Wadsley, J. A. Sellwood, Ralph E. Pudritz   +3 more
doaj   +1 more source

Magnetic-Field Vector Maps of Nearby Spiral Galaxies

Galaxies, 2019
We present a method for determining the directions of magnetic-field vectors in a spiral galaxy using two synchrotron polarization maps, an optical image, and a velocity field.
Hiroyuki Nakanishi, Kohei Kurahara, Kenta Anraku   +2 more
doaj   +1 more source