Results 51 to 60 of about 37,813 (241)

Supernova Remnants [PDF]

Highlights of Astronomy, 1974
AbstractThe present structure and recent changes in Cas A are discussed. On the deepest available exposures the optical remnant of this supernova is seen to consist of an almost complete shell. The southern part of this shell is outlined by knots that have developed during the last decade.
openaire   +2 more sources

PERIODIC AND SPORADIC VARIATIONS IN THE SPECTRAL FLUX DENSITY OF THE CAS A SUPERNOVA REMNANT [PDF]

Radio Physics and Radio Astronomy, 2020
Purpose: Based on the long-term study data in all radio spectrum ranges, the nature of deviations of spectral flux density of the Cas A supernova remnant from the tendency of its secular decrease is considered.
A. A. Gorbunov, M. I. Ryabov, A. L. Sukharev, V. V. Bezrukovs   +3 more
doaj   +1 more source

Optimized ACE2‐Fc fusion proteins with picomolar neutralization activity against highly evolved SARS‐CoV‐2 variants

Protein Science, Volume 35, Issue 2, February 2026.
Abstract The rapid evolution of severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) has compromised the efficacy of many authorized monoclonal antibody products. This highlights the need for alternative strategies, especially for vulnerable populations such as immunocompromised individuals.
Ferran Abancó, Ferran Tarrés‐Freixas, Rosalba Lepore, Elisa Molina‐Molina, Eloi Franco, Rytis Boreika, Edwards Pradenas, Dàlia Raïch‐Regué, Itziar Erkizia, Bonaventura Clotet, Alfonso Valencia, Júlia Vergara‐Alert, Joaquim Segalés, Jorge Carrillo, Nuria Izquierdo‐Useros, Julià Blanco, Benjamin Trinité   +16 more
wiley   +1 more source

Expansion Properties of the Young Supernova Type Iax Remnant Pa 30 Revealed

The Astrophysical Journal Letters
The recently discovered Pa 30 nebula, the putative type Iax supernova remnant associated with the historical supernova of 1181 AD, shows puzzling characteristics that make it unique among known supernova remnants.
Tim Cunningham, Ilaria Caiazzo, Nikolaus Z. Prusinski, James Fuller, John C. Raymond, S. R. Kulkarni, James D. Neill, Paul Duffell, Chris Martin, Odette Toloza, David Charbonneau, Scott J. Kenyon, Zeren Lin, Mateusz Matuszewski, Rosalie McGurk, Abigail Polin, Philippe Z. Yao   +16 more
doaj   +1 more source

Pulsar wind nebulae in supernova remnants [PDF]

, 2000
A spherically symmetric model is presented for the interaction of a pulsar wind with the associated supernova remnant. This results in a pulsar wind nebula whose evolution is coupled to the evolution of the surrounding supernova remnant.
Achterberg, A., Gallant, Y. A., Tóth, G., van der Swaluw, E.   +3 more
core   +2 more sources

Formation of Uranium Pinacolate from the Reductive Coupling of Acetone

Zeitschrift für anorganische und allgemeine Chemie, Volume 652, Issue 1, January 6, 2026.
Uranium(III) cyclopentadienyl complexes are shown to react with acetone in a pinacol coupling, forming uranium pinacolate complexes. Single crystals obtained from the reaction are the first direct structural proof of the previously proposed metallapinacolate intermediate. 1,2‐Diols are elemental building blocks in organic synthesis.
León Hillers, Lisa Vondung
wiley   +1 more source

Stabilizing Anion–Anion Aggregates via Dihydrogen Bonds in Non‐Classical Inorganic Molecules

Aggregate, Volume 7, Issue 1, January 2026.
Despite Coulomb's law, the anionic [o‐FESAN]− cluster forms stable anti‐electrostatic aggregates via short dihydrogen bonds. Experimental (nuclear magnetic resonance, dynamic light scattering, and X‐ray diffraction) and theoretical (density functional theory) studies reveal that C–H···H–B interactions overcome long‐range repulsion, enabling cluster ...
Adnana Zaulet, Miquel Nuez‐Martinez, Pipsa Hirva, Reijo Sillanpää, Francesc Teixidor, Clara Viñas   +5 more
wiley   +1 more source

Supernova Dust Evolution Probed by Deep-sea 60Fe Time History

The Astrophysical Journal, 2023
There is a wealth of data on live, undecayed ^60 Fe ( t _1/2 = 2.6 Myr) in deep-sea deposits, the lunar regolith, cosmic rays, and Antarctic snow, which is interpreted as originating from the recent explosions of at least two near-Earth supernovae.
Adrienne F. Ertel, Brian J. Fry, Brian D. Fields, John Ellis   +3 more
doaj   +1 more source

Multiband Emission from Pulsar Wind Nebulae: A Possible Injection Spectrum [PDF]

, 2010
A recent research shows that particles with a spectrum of a relativistic Maxwellian plus a high-energy tail can be accelerated by relativistic collisionless shocks.
Fang, J., Zhang, L.
core   +1 more source

Logarithmic and Strong Coupling Models in Weyl‐Type f(Q,T)$f(Q,T)$ Gravity

Annalen der Physik, Volume 538, Issue 1, January 2026.
This work explores Weyl‐type f(Q,T) gravity using recent observational datasets — CC, Pantheon+, Union 3.0, and DESI DR2. Through MCMC analysis of logarithmic and strong coupling models, the study reveals a transition from deceleration to acceleration, quintessence‐to‐phantom dynamics, and late‐time consistency with LCDM, offering a geometry‐driven ...
Rahul Bhagat, S. K. Tripathy, B. Mishra
wiley   +1 more source