Results 21 to 30 of about 4,973 (237)
PURIFY: a new algorithmic framework for next-generation radio-interferometric imaging [PDF]
, 2014 In recent works, compressed sensing (CS) and convex opti- mization techniques have been applied to radio-interferometric imaging showing the potential to outperform state-of-the-art imaging algorithms in the field. We review our latest con- tributions [1,
Wiaux, Yves; id_orcid +8 more
core +1 more source
Residual Entropy as a Diagnostic and Stopping Metric for CLEAN
The Astronomical Journal, 2023 We propose the use of entropy, measured from the spatial and flux distribution of pixels in the residual image, as a potential diagnostic and stopping metric for the CLEAN algorithm.
D. C. Homan, J. S. Roth, A. B. Pushkarev
doaj +1 more source
ANALYSIS OF DUAL-FREQUENCY INTERFEROMETRY APPLICABILITY FOR TARGET ELEVATION ANGLE MEASUREMENT USING TWO-COORDINATE RADARS [PDF]
Radio Physics and Radio Astronomy, 2023 Subject and Purpose. The study deals with the dual-frequency radio interferometry technique, which is based on the employment of two fairly close frequencies with the aim to remove ambiguity of the radar target elevation estimation using 2D-radar and ...
V. G. Galushko +2 more
doaj +1 more source
On the RFI Detection in Differential Interferometric Synthetic Aperture Radar [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information SciencesSynthetic Aperture Radar (SAR) can image the ground with a wide area and high resolution at all times and in all weather and has become an important means of remote sensing.
Y. Liu, M. Tao, J. Li, T. Li, J. Chen
doaj +1 more source
Galaxies, 2021 NenuFAR, the New Extension in Nancay Upgrading LOFAR, is currently in its early science phase. It is in this context that the Cosmic Filaments and Magnetism Pilot Survey is observing sources with the array as it is still under construction—with 57 (56 ...
Etienne Bonnassieux +11 more
doaj +1 more source
VHF Radio Interferometry of Lightning [PDF]
International Astronomical Union Colloquium, 1991 AbstractLightning discharges radiate strongly at radio frequencies, and studies of the radiation provide valuable information on lightning breakdown processes. Interferometric techniques can be used to locate the numerous radiation events as a function of time during a discharge and to generate images of the developing lightning channels inside a storm,
P.R. Krehbiel +4 more
openaire +1 more source
Inherent and Local Magnetic Field Structures in Jets from Active Galactic Nuclei
Galaxies, 2021 In theoretical models for the electromagnetic launching of astrophysical jets, a helical magnetic (B)-field component is generated through the winding up of an initial longitudinal field component by the rotation of the cental black hole and accretion ...
Denise C. Gabuzda
doaj +1 more source
Secondary Site Ligand for Integrin αVβ3 Enables Targeted mRNA Delivery
Angewandte Chemie, EarlyView.Non‐orthosteric, low‐affinity ligands for integrin αVβ3, identified by fragment screening, achieve superselective nanoparticle targeting (ακ ≈ 3) of αVβ3‐overexpressing endothelial cells. Unlike traditional arginine–glycine–aspartate decorated particles, these fragment‐functionalized LNPs discriminate cells by receptor density and deliver mRNA to ...
Sebastian Bayer +7 more
wiley +2 more sources
Testing of the transionospheric radiochannel using data from the global GPS network
Annals of Geophysics, 2003 Using the international ground-based network of two-frequency receivers of the GPS navigation system provides a means of carrying out a global, continuous and fully-computerized monitoring of phase fluctuations of signals from satellite-borne ...
V. A. Karachenschev, E. L. Afraimovich
doaj +1 more source
Characterizing Pulsars Detected in the Rapid ASKAP Continuum Survey
The Astrophysical Journal, 2023 We present the detection of 661 known pulsars observed with the Australian SKA Pathfinder (ASKAP) telescope at 888 MHz as part of the Rapid ASKAP Continuum Survey (RACS).
Akash Anumarlapudi +18 more
doaj +1 more source