Results 71 to 80 of about 876,327 (353)

THE STUDY OF EXTRAGALACTIC SOURCES 3C 446 AND 3C 345 WITH USING THE SINGULAR SPECTRUM AND WAVELET ANALYSIS

Odessa Astronomical Publications, 2016
We investigated the data of monitoring of flux density of extragalactic sources 3С446 and 3C345, which was held on 26-meter radio telescope of University of Michigan at frequencies 14.5, 8 and 4.8 GHz.
G. I. Donskykh, M. I. Ryabov, A. L. Sukharev, M. F. Aller   +3 more
doaj   +1 more source

Frequency Interpolation of LOFAR Embedded Element Patterns Using Spherical Wave Expansion

International Journal of Antennas and Propagation, 2021
This paper describes the use of spherical wave expansion (SWE) to model the embedded element patterns of the LOFAR low-band array. The goal is to reduce the amount of data needed to store the embedded element patterns.
M. J. Arts, D. S. Prinsloo, M. J. Bentum, A. B. Smolders   +3 more
doaj   +1 more source

Realization of Complex‐Shaped Magnetic Nanotubes with 3D Printing and Electrodeposition

Advanced Functional Materials, EarlyView.
Complex‐shaped magnetic nanotubes were fabricated by coating three‐dimensional nanoscaffolds fabricated with focused electron beam induced deposition with a magnetic coating via electrodeposition. X‐ray magnetic microscopy and simulations revealed an azimuthal magnetic configuration within the nanotubes and pinning of domain walls at curved vertices ...
Claudia Fernández‐González, Pamela Morales‐Fernández, Luke Alexander Turnbull, Claas Abert, Dieter Suess, Michael Foerster, Miguel Á. Niño, Pawel Nita, Anna Mandziak, Simone Finizio, Nuria Bagués, Eva Pereiro, Amalio Fernández‐Pacheco, Lucas Pérez, Sandra Ruiz‐Gómez, Claire Donnelly   +15 more
wiley   +1 more source

A Comparative Analysis of Plasmonic and Dielectric Metasurface Sensing Platforms Powered by Bound States in the Continuum

Advanced Functional Materials, EarlyView.
This work reveals a fundamental trade‐off between plasmonic and dielectric metasurfaces for molecular sensing. A clear performance crossover is identified: dielectric metasurfaces excel in air, while plasmonic metasurfaces dominate in lossy solvents. These results establish design rules for infrared metasurface sensors and enable optimized performance ...
Tao Jiang, Angana Bhattacharya, Martin Barkey, Andreas Aigner, Lina Rohrer, Thomas Weber, Juan Wang, Stefan A. Maier, Andreas Tittl   +8 more
wiley   +1 more source

Unveiling the power of multimodal large language models for radio astronomical image understanding and question answering

Machine Learning: Science and Technology
Although multimodal large language models (MLLMs) have shown remarkable achievements across various scientific domains, their applications in radio astronomy remain largely unexplored.
Fuyong Zhao, Yuyang Li, Zhenyu Liu, Panfeng Chen, Cunshi Wang, Jifeng Liu, Hui Li, Yanhao Wang   +7 more
doaj   +1 more source

DECAMETER PULSARS AND TRANSIENTS SURVEY OF THE NORTHERN SKY. STATUS, FIRST RESULTS, MULTIPARAMETRIC PIPELINE FOR CANDIDATE SELECTION

Odessa Astronomical Publications, 2016
We present the results of processing first 20% of Northern sky pulsars and transients survey using UTR-2 radio telescope. Data processing is done by an automatic pipeline that detects and outputs a large number of transient candidates (usually dispersed ...
V. V. Zakharenko, I. P. Kravtsov, I. Y. Vasylieva, S. S. Mykhailova, O. M. Ulyanov, A. I. Shevtsova, A. O. Skoryk, P. Zarka, O. O. Konovalenko   +8 more
doaj   +1 more source

MASER: A Science Ready Toolbox for Low Frequency Radio Astronomy

Data Science Journal, 2020
MASER (Measurements, Analysis, and Simulation of Emission in the Radio range) is a comprehensive infrastructure dedicated to time-dependent low frequency radio astronomy (up to about 50 MHz). The main radio sources observed in this spectral range are the
Baptiste Cecconi, Alan Loh, Pierre Le Sidaner, Renaud Savalle, Xavier Bonnin, Quynh Nhu Nguyen, Sonny Lion, Albert Shih, Stéphane Aicardi, Philippe Zarka, Corentin Louis, Andrée Coffre, Laurent Lamy, Laurent Denis, Jean-Mathias Grießmeier, Jeremy Faden, Chris Piker, Nicolas André, Vincent Génot, Stéphane Erard, Joseph N. Mafi, Todd A. King, Jim Sky, Markus Demleitner   +23 more
doaj   +1 more source

Analysis of KVN 21m Radio Antenna Optics using Ray-Tracing Method [PDF]

Journal of Astronomy and Space Sciences, 2009
In this work, we calculate drop in antenna gain, aperture phase distribution, and antenna pointing shift of KVN(Korean VLBI Network) 21m shaped Cassegrain antenna due to misalignments of antenna optics using ray-tracing method.
Jae-Han Bae, Do-Young Byun
doaj   +1 more source

Self‐Trapped Hole Migration and Defect‐Mediated Thermal Quenching of Luminescence in α‐ and β‐Ga2O3

Advanced Functional Materials, EarlyView.
Temperature‐dependent photoluminescence and first‐principles calculations reveal self‐trapped hole migration as the microscopic origin of thermal quenching in α‐ and β‐Ga2O3. The low migration barrier in α‐Ga2O3 enables defect trapping and enhances blue luminescence, while the higher barrier in β‐Ga2O3 preserves ultraviolet emission at elevated ...
Nima Hajizadeh, Ymir K. Frodason, Clemens Petersen, Benjamin M. Janzen, Luca Sung‐Min Choi, Nils Bernhardt, Felix Nippert, Zbigniew Galazka, Joel B. Varley, Holger von Wenckstern, Lasse Vines, Markus R. Wagner   +11 more
wiley   +1 more source

An Analysis of Embedding Impedance for Q-Band Waveguide Gunn Oscillator With Resonance Post [PDF]

Journal of Astronomy and Space Sciences, 2001
The oscillation frequency tuning range of waveguide Gunn oscillator and its stability depend sensitively on the dimensions of the resonator. Therefore the embedding impedances with the various dimensions of the resonator for Q-band (33~50 GHz) Gunn ...
Hyungjoo Kim, Seogtae Han, Taiseong Kim, Kwangdong Kim, Changhoon Lee, Moonhee Chung, Yonggi Kim   +6 more
doaj