Results 31 to 40 of about 2,211 (159)

A Low-Insertion Loss Cryogenic Edge-Mode Isolator With 18 GHz Bandwidth

IEEE Journal of Microwaves, 2023
Cryogenic isolators play an important role in low-noise receiver systems widely employed in millimeter and submillimeter telescopes. To enable a significantly wider Intermediate Frequency (IF) bandwidth, there is strong demand for a wideband, low-loss ...
Lingzhen Zeng, Cheuk-Yu Edward Tong, Scott N. Paine   +2 more
doaj   +1 more source

Giant Magnetic Coercivity Driven by Spin‐Bag Ferromagnetism in Epitaxial Sr3YCo4O10+δ Films with Engineered 2D Oxygen Vacancy Ordering

Advanced Functional Materials, EarlyView.
A giant magnetic coercivity and a vertical shift of hysteresis loops are demonstrated in Sr3YCo4O10+δ epitaxial films. The hard magnetic behavior originates from ferromagnetic spin bags stabilized within a long‐range ordered oxygen‐vacancy structure.
Yanbin Chen, Roger Guzman, Xiaomin Jia, Jialu Wu, Xing Xu, Li Sun, Jinbo Pan, Shixuan Du, Myung‐Hwan Whangbo, Wu Zhou, Jing Ma, Ce‐wen Nan, Chonglin Chen   +12 more
wiley   +1 more source

Electromagnetic Analysis and Experimental Validation of the LOFAR Radiation Patterns

International Journal of Antennas and Propagation, 2019
Low-frequency (
Paola Di Ninni, Pietro Bolli, Fabio Paonessa, Giuseppe Pupillo, Giuseppe Virone, Stefan J. Wijnholds   +5 more
doaj   +1 more source

Towards the possibility to combine LOFAR and GNSS measurements to sense ionospheric irregularities

Journal of Space Weather and Space Climate, 2023
Inhomogeneities within the ionospheric plasma density affect trans-ionospheric radio signals, causing radio wave scintillation in the amplitude and phase of the signals.
Flisek Paweł, Forte Biagio, Fallows Richard, Kotulak Kacper, Krankowski Andrzej, Bisi Mario, Mevius Maaijke, Froń Adam, Tiburzi Caterina, Soida Marian, Śmierciak Bartosz, Grzesiak Marcin, Matyjasiak Barbara, Pożoga Mariusz, Dąbrowski Bartosz, Mann Gottfried, Vocks Christian, Zucca Pietro, Błaszkiewicz Leszek   +18 more
doaj   +1 more source

Development of the radio astronomical method of cosmic particle detection for extremely high-energy cosmic ray physics and neutrino astronomy

EPJ Web of Conferences, 2017
The proposal to use ground based radio telescopes for detection of Askaryan radio pulses from particle cascades arising when extremely high-energy (EHE > 1020 eV) cosmic rays (including neutrinos) interact with the lunar regolith of multi gigaton mass ...
Zheleznykh Igor, Dagkesamanskii Rustam, Dedenko Leonid, Dedenko Grigorii   +3 more
doaj   +2 more sources

Sky Radio Quiet Zones for Mitigating RFI From Large-Scale NGSO Satellites to Ground Radio Astronomy System

IEEE Access, 2023
Emerging large-scale non-geostationary orbit (NGSO) satellite communication (SatCom) systems with more than thousands of satellites raise a serious concern of radio frequency interference (RFI) to the ground-based radio astronomy system (RAS).
Hlaing Minn, Zhixuan Fan
doaj   +1 more source

Low Frequency Radio Astronomy from Earth Orbit [PDF]

International Astronomical Union Colloquium, 1990
AbstractLow frequency radio astronomy for the purpose of this discussion is defined as frequencies ≲100 MHz. Since the technology is fairly simple at these frequencies and even Jansky’s original observations were made at 20.5 MHz, there have been many years of research at these wavelengths.
Kurt W. Weiler, Namir E. Kassim
openaire   +1 more source

Design a radio receiver for solar activity observation in VLF band

Al-Khawarizmi Engineering Journal, 2023
Solar activity monitoring is important in our life because of its direct or indirect influence on our life, not only on ionospheric communications. To study solar activity, researchers need measuring and monitoring instruments, these instruments are ...
Ahmed Al Banna
doaj   +1 more source

Spiking neural networks for radio frequency interference detection in radio astronomy

Communications Physics
Automated systems capable of real-time operation with minimal energy consumption are increasingly important in modern radio telescopes. Spiking Neural Networks (SNNs) promise efficient and dynamic spatio-temporal data processing.
Nicholas J. Pritchard, Andreas Wicenec, Mohammed Bennamoun, Richard Dodson   +3 more
doaj   +1 more source

Low-Frequency Square Kilometer Array Pattern Optimization via Convex Programming

Applied Sciences
A well-known and powerful convex optimization strategy is exploited to enhance the electromagnetic performance of the Square Kilometer Array Low-Frequency radio telescope.
Giada Maria Battaglia, Giuseppe Caruso, Pietro Bolli, Maria Grazia Labate, Roberta Palmeri, Andrea Francesco Morabito   +5 more
doaj   +1 more source