Results 71 to 80 of about 418,709 (225)

A Rigorous Solution to the Superluminal Issue in the Diffusion Equation

The Astrophysical Journal
Superluminal propagation is an intrinsic problem in the diffusion equation and has not been effectively addressed for a long time. In this work, a rigorous solution to this issue is obtained under the assumption that particles undergo a random flight ...
Xing-Jian Lv, Xiao-Jun Bi, Kun Fang, Peng-Fei Yin, Meng-Jie Zhao   +4 more
doaj   +1 more source

Ultra‐Weak Photon Emission as a By‐Product of Mitochondrial Oxidative Metabolism: Mechanisms, Limits, and Implications

Nanophotonics, Volume 15, Issue 20, 27 October 2026.
Mitochondrial oxidative metabolism generates ROS. Downstream chemiexcitation triplet carbonyls, singlet oxygen; produces ultra‐weak photon emission (UPE). Energetic bounds restrict well‐coupled respiration to extremely weak, red/NIR‐biased emission. Stronger visible UPE indicates elevated oxidative flux, linking measured photon counts to redox state ...
Samuel Crowther, Alice Attenborough, Frank Vollmer   +2 more
wiley   +1 more source

TeV GAMMA RAYS: OBSERVATIONS VERSUS EXPECTATIONS & THEORY

Acta Polytechnica, 2013
The scope of this paper is to discuss two important questions relevant for TeV γ-ray astronomy; the pursuit to reveal the origin of cosmic rays in our galaxy, and the opacity of the universe in γ-rays.
Frank Krennrich
doaj   +1 more source

Cosmogenic 10Be as a Tracer for Recent Heliospheric Encounters With Interstellar Cold Clouds and Nearby Supernovae

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract Recent works suggest there are periods when the Sun encountered massive interstellar cold clouds which compressed the heliosphere to within Earth's orbit, exposing Earth to interstellar galactic cosmic rays and energetic particles of heliospheric origin.
Anna Nica, Merav Opher, Jesse A. Miller, Jennifer L. Middleton, Joe Giacalone   +4 more
wiley   +1 more source

Cosmic X-Ray Sources-Galactic and Extragalactic.

The Astronomical Journal, 1966
Instruments carried aboard an Aerobee rocket in April 1965 provided evidence for x-ray emission from the directions of the radio galaxies Cygnus A and M-87 and from the galactic supernova remnant Cassiopeia A. A survey of the Cygnus region revealed a marked decrease in the flux of x-rays from Cygnus XR-1, which was identified in June 1964 as the second
E T, Byram, T A, Chubb, H, Friedman
openaire   +3 more sources

Spectrum and mass composition of cosmic rays in the energy range 1015–1018 eV derived from the Yakutsk array data

EPJ Web of Conferences, 2013
A spectrum of cosmic rays within energy range 1015 − 3 × 1017 eV was derived from the data of the small Cherenkov setup, which is a part of the Yakutsk complex EAS array. In this, work a new series of observation is covered.
Sabourov A., Knurenko S.P.
doaj   +1 more source

Trp53 Deficiency Increases the Frequency of Hprt Mutant T Lymphocytes Following High‐LET Iron Particle Irradiation of Mice

Environmental and Molecular Mutagenesis, Volume 67, Issue 8-9, October-November 2026.
ABSTRACT Charged particles like iron‐56 ions impose health risks in long‐term manned space exploration. This study was designed to define the impact of Trp53 status upon the manifestation of mutations in the hypoxanthine‐guanine phosphoribosyltransferase (Hprt) gene in splenic T‐cells following exposure of Trp53 wild‐type, hemizygous, and nullizygous ...
Vernon E. Walker, Dale M. Walker, Vasily N. Dobrovolsky, Louise Lutze‐Mann   +3 more
wiley   +1 more source

ACTIVE GALACTIC NUCLEI: SOURCES FOR ULTRA HIGH ENERGY COSMIC RAYS [PDF]

, 2009
Ultra high energy cosmic ray events presently show a spectrum, which we interpret here as galactic cosmic rays due to a starburst, in the radio galaxy Cen A which is pushed up in energy by the shock of a relativistic jet.
Meli, Athina, LÁ, Gergely, T, Stanev, MELI, A., P. L. BIERMANN, Becker, Julia J.K., IC, Mariş, JK, Becker, V. DE SOUZA, Souza, Vitor de, A. MELI, Biermann, Peter P.L., T. STANEV, CARAMETE, L., A, Meli, BECKER, J. K., L. GERGELY, Stanev, Todor, I. C. MARIŞ, GERGELY, L., L, Caramete, V, de Souza, STANEV, T., Gergely, László Árpád L., De Souza, Vitor, Caramete, Laurent¸iu Ioan L., J. K. BECKER, Maris, Ioana Codrina, Souza, V. de, MARIS, I. C., L. CARAMETE, PL, Biermann, BIERMANN, P. L.   +32 more
core   +1 more source

DRIFT EFFECTS ON THE GALACTIC COSMIC RAY MODULATION

The Astrophysical Journal, 2014
Cosmic ray (CR) modulation is driven by both solar activity and drift effects in the heliosphere, although their role is only qualitatively understood as it is difficult to connect the CR variations to their sources. In order to address this problem, the Empirical Mode Decomposition technique has been applied to the CR intensity, recorded by three ...
Monica Laurenza, Marisa Storini, Alberto Vecchio, Alberto Vecchio, Vincenzo Carbone   +4 more
openaire   +2 more sources

Can diffuse X-rays be important in driving photoionisation in molecular clouds?

Astronomy & Astrophysics
Context. The ionisation balance in molecular clouds is regulated by several ionising sources, including cosmic rays, X-rays, and ultraviolet radiation. Their relative importance depends on the local physical conditions and on the shielding column density.
Makarenko E. I., Ivlev A. V., Bialy S., Zheng X., Gaches B. A. L., Caselli P., Padovani M., Yeung M. C. H.   +7 more
doaj   +1 more source