Results 11 to 20 of about 3,315 (186)

First Very Long Baseline Interferometry Detections at 870 μm [PDF]

open access: yesThe Astronomical Journal
The first very long baseline interferometry (VLBI) detections at 870 μ m wavelength (345 GHz frequency) are reported, achieving the highest diffraction-limited angular resolution yet obtained from the surface of the Earth and the highest-frequency ...
Alexander W. Raymond   +278 more
doaj   +11 more sources

Probing the solar corona with very long baseline interferometry. [PDF]

open access: yesNat Commun, 2014
AbstractUnderstanding and monitoring the solar corona and solar wind is important for many applications like telecommunications or geomagnetic studies. Coronal electron density models have been derived by various techniques over the last 45 years, principally by analysing the effect of the corona on spacecraft tracking.
Soja B, Heinkelmann R, Schuh H.
europepmc   +6 more sources

Very Long Baseline Interferometry with the SKA [PDF]

open access: yesProceedings of Advancing Astrophysics with the Square Kilometre Array — PoS(AASKA14), 2015
Adding VLBI capability to the SKA arrays will greatly broaden the science of the SKA, and is feasible within the current specifications. SKA-VLBI can be initially implemented by providing phased-array outputs for SKA1-MID and SKA1-SUR and using these extremely sensitive stations with other radio telescopes, and in SKA2 by realising a distributed ...
Paragi, Zsolt,   +81 more
openaire   +13 more sources

PHOTON MASS AND VERY LONG BASELINE INTERFEROMETRY [PDF]

open access: yesInternational Journal of Modern Physics D, 2010
A relation between the photon mass, its frequency, ν, and the deflection parameter, γ, determined by experimentalists (that characterizes the contribution of space curvature to gravitational deflection) is found. This amazing result allows us to conclude that the knowledge of the parameters ν and γ is all we need to set up gravitational bounds on the ...
Accioly, Antonio Jose   +2 more
openaire   +4 more sources

Lorentz symmetry and very long baseline interferometry [PDF]

open access: yesPhysical Review D, 2016
Lorentz symmetry violations can be described by an effective field theory framework that contains both General Relativity and the Standard Model of particle physics called the Standard-Model extension (SME). Recently, post-fit analysis of Gravity Probe B and binary pulsars lead to an upper limit at the $10^{-4}$ level on the time-time coefficient $\bar
Poncin-Lafitte, C. Le   +2 more
openaire   +4 more sources

Very Long Baseline Interferometry [PDF]

open access: yesHighlights of Astronomy, 1989
The technique of very long baseline interferometry (VLBI) has undergone two decades of steady growth and refinement since its inception in 1967. In the beginning, only crude measurements of visibility on single baselines were possible. Now 18-station arrays have been used to produce images with dynamic ranges exceeding 2000:1; relative motions of ...
openaire   +2 more sources

Key Science Goals for the Next-Generation Event Horizon Telescope

open access: yesGalaxies, 2023
The Event Horizon Telescope (EHT) has led to the first images of a supermassive black hole, revealing the central compact objects in the elliptical galaxy M87 and the Milky Way.
Michael D. Johnson   +44 more
doaj   +1 more source

Evaluation of VLBI Observations with Sensitivity and Robustness Analyses

open access: yesMathematics, 2020
Very Long Baseline Interferometry (VLBI) plays an indispensable role in the realization of global terrestrial and celestial reference frames and in the determination of the full set of the Earth Orientation Parameters (EOP).
Pakize Küreç Nehbit   +8 more
doaj   +1 more source

Modeling Atmospheric Phase Corruptions in High-frequency Very-long-baseline Interferometry Using Gaussian Processes

open access: yesThe Astronomical Journal
Using very-long-baseline interferometry (VLBI) observations at (sub)millimeter wavelengths, the Event Horizon Telescope (EHT) currently achieves the finest angular resolution of any astronomical facility, necessary for imaging the horizon-scale structure
Uri Rolls   +5 more
doaj   +1 more source

Identification of a Shiga toxin A‐derived peptide internalized into Gb3 receptor‐bearing cells via interaction with the Shiga toxin B subunit

open access: yesFEBS Letters, EarlyView.
The process of internalization of the Shiga toxin A subunit via formation of a complex with the Shiga toxin B subunit, which specifically binds to the Gb3 receptor. The peptide is designed to act as a carrier of drugs into cancer cells. Here, we explored the potential of peptides derived from the catalytic A subunit of Shiga toxin (STxA) to be drug ...
Giulia Opassi   +6 more
wiley   +1 more source

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