Results 31 to 40 of about 345 (143)

Calibration of Electrically Short Antennas Using the l = 2 Spherical Harmonic Expansion Coefficients of the Radio Brightness Distribution on the Sky Between 0.5 and 6.8 MHz

Radio Science, Volume 60, Issue 8, August 2025.
Abstract A space‐borne radio‐frequency antenna is typically located in the vicinity of a conductive spacecraft body that influences its beam. Also, at wavelengths that greatly exceed the sizes of such an antenna and spacecraft, the antenna is expected to have the beam of an equivalent short dipole.
Brent Page, Alain Lecacheux, Marc Pulupa, Stuart D. Bale   +3 more
wiley   +1 more source

Radiation Signatures of Electron Acceleration in the Decelerating Jet of MAXI J1348-630

The Astrophysical Journal
A discrete jet component (blob) ejection and its subsequent deceleration were observed in the 2019/2020 outburst of the low-mass X-ray binary MAXI J1348-630.
Aishwarya Sarath, Markus Böttcher
doaj   +1 more source

Spatial variations in polarized synchrotron emission in the QUIJOTE MFI data using neural networks

Astronomy & Astrophysics
Polarized synchrotron emission from ultra-relativistic electrons spiraling the Galactic magnetic field has recently become one of the most relevant emissions in the interstellar medium because the quality of low-frequency observations has improved.
Casas J. M., Bonavera L., González-Nuevo J., Rubiño-Martín J. A., Génova-Santos R. T., Barreiro R. B., Cueli M. M., Crespo D., Fernández-Fernández R., Cano J. A.   +9 more
doaj   +1 more source

Ist Phenylnitren ein fehlendes Bindeglied in der Bildung polyzyklischer aromatischer Stickstoffheterozyklen?

Angewandte Chemie, Volume 137, Issue 31, July 28, 2025.
Ein neuer Bildungsweg für polyzyklische aromatische Stickstoffheterozyklen (PANH) wurde gefunden. Die Reaktion von Phenylnitren mit dem Propargylradikal führt zu Chinolin und belegt, dass Nitrene geeignete Vorläufer zum Einbau von Stickstoffheteroatomen sind.
Rahel Arns, Rory McClish, Patrick Hemberger, Andras Bodi, Jordy Bouwman, Tina Kasper, Domenik Schleier   +6 more
wiley   +1 more source

Imprints of the Neutral Interstellar Medium on Polarized Synchrotron Emission and Faraday Rotation

The interstellar medium (ISM) is a complex, multiphase medium, where disentangling the distribution of gas and magnetic field structure across different phases remains a considerable challenge. Recently, Faraday tomography enabled by broadband polarized radio observations has emerged as a promising probe of 3D ISM gas and magnetic field structures ...
Lei, Minjie, Clark, S. E., Tahani, Mehrnoosh, Bracco, A., Ma, Yik Ki, Seta, Amit, West, Jennifer, Carretti, E.   +7 more
openaire   +2 more sources

Is Phenylnitrene a Missing Link in the Formation of Polycyclic Aromatic Nitrogen Heterocycles?

Angewandte Chemie International Edition, Volume 64, Issue 31, July 28, 2025.
A new formation pathway for polycyclic aromatic nitrogen heterocycles (PANHs) has been found. The reaction of phenylnitrene and the propargyl radical leads to quinoline, proving that nitrenes are suitable precursors for nitrogen incorporation mechanisms.
Rahel Arns, Rory McClish, Patrick Hemberger, Andras Bodi, Jordy Bouwman, Tina Kasper, Domenik Schleier   +6 more
wiley   +1 more source

Volume measurement of microparticles using SEM photogrammetry and 3‐D reconstruction

Meteoritics &Planetary Science, Volume 60, Issue 5, Page 1227-1235, May 2025.
Abstract In this paper, we introduce a method for volume measurement of microparticles that includes scanning electron microscope photogrammetry with 3‐D model construction. Our results show that our method limits the volume uncertainty to ±10%, which is a significant improvement compared to previous methods (which likely overestimated volume by 100 ...
Y. Zheng, X. Yang, M. Valdes, A. M. Davis, P. R. Heck   +4 more
wiley   +1 more source

Helical Magnetic Field in a Massive Protostellar Jet

The Astrophysical Journal Letters
Highly collimated outflows (jets) are observed across a wide range of astrophysical systems involving the accretion of material onto central objects, from supermassive black holes in active galaxies to proto-brown dwarfs and stellar-mass black holes ...
A. Rodríguez-Kamenetzky, A. Pasetto, C. Carrasco-González, L. F. Rodríguez, J. L. Gómez, G. Anglada, J. M. Torrelles, N. R. C. Gomes, S. Vig, J. Martí   +9 more
doaj   +1 more source

Exploring the Growth Dynamics of Size‐Selected Carbon Atomic Wires with In Situ UV Resonance Raman Spectroscopy

Small, Volume 20, Issue 49, December 5, 2024.
Time‐resolved, in situ UV resonance Raman approach to monitor carbon atomic wires growth via pulsed laser ablation in liquid. This approach tracks solvent‐dependent, size‐selected wires formation, correlating their Raman responses with concentration as a function of ablation time.
Pietro Marabotti, Sonia Peggiani, Simone Melesi, Barbara Rossi, Alessandro Gessini, Andrea Li Bassi, Valeria Russo, Carlo Spartaco Casari   +7 more
wiley   +1 more source

Using Two-frequency Dust Spectral Matching to Separate Galactic Synchrotron and Free–Free Temperature Foregrounds from the Cosmic Microwave Background

The Astrophysical Journal
We introduce a method for removing cosmic microwave background (CMB) and anomalous microwave emission (AME, or spinning dust) intensity signals at high to intermediate Galactic latitudes in temperature sky maps at frequencies roughly between 5 and 40 GHz.
J. L. Weiland, Charles L. Bennett, Graeme E. Addison, Mark Halpern, Gary Hinshaw   +4 more
doaj   +1 more source