Results 11 to 20 of about 154 (132)

A Comparative Study of VTEC Estimates Derived From S/X VLBI and VGOS Observations

Space Weather
The ionosphere, which strongly varies in time and space, is one of the largest error sources for microwave measurements, if not accounted for accurately.
Benedikt Soja
exaly   +3 more sources

Bridging astronomical, astrometric and geodetic scheduling for VGOS

Journal of Geodesy, 2023
AbstractVery Long Baseline Interferometry (VLBI) experiments are organized within the geodetic, astrometric and astronomical communities for different applications, requiring different observation strategies adopted in scheduling. Currently, the next-generation geodetic and astrometric VLBI Global Observing System (VGOS) is being established.
Matthias Schartner, Ming Hui Xu, Benedikt Soja   +2 more
exaly   +6 more sources

On the Integration of VLBI Observations to GENESIS into Global VGOS Operations

Remote Sensing
The upcoming European Space Agency (ESA) satellite mission GENESIS is an Earth-orbiting satellite carrying instruments of all four space geodetic techniques.
David Schunck, Lucia McCallum, Guifré Molera Calvés   +2 more
doaj   +2 more sources

Global trend of food-induced anaphylaxis: Up to date. [PDF]

Pediatr Allergy Immunol
Abstract This review examines the evolving global landscape of food‐induced anaphylaxis (FIA), revealing critical epidemiological shifts that challenge traditional allergen management paradigms. As the leading cause of anaphylaxis worldwide, FIA demonstrates striking geographic, age‐specific, and temporal patterns that reflect broader changes in ...
Leung AS, Estrada-Reyes E, Goto K, Huang CH, Li JM, Nagarajan SA, Ranasinghe T, Sato S, Srisuwatchari W, Zepeda-Ortega B, Tham EH.   +10 more
europepmc   +2 more sources

Unconstrained Estimation of VLBI Global Observing System Station Coordinates [PDF]

Advances in Geosciences, 2021
The International VLBI Service for Geodesy and Astrometry (IVS) is currently setting up a network of smaller and thus faster radio telescopes observing at broader bandwidths for improved determination of geodetic parameters. However, this new VLBI Global
M. Mikschi, J. Böhm, M. Schartner, M. Schartner   +3 more
doaj   +1 more source

The Compatibility of DORIS with VGOS

, 2023
In global geodesy co-location of geodetic space techniques are required for mutual control of the measurements. The ground-based active transmitters of the DORIS system are in conflict to VLBI-observations. The VLBI systems are designed to receive extremely faint cosmic signals down to -110 dBm , whereas the DORIS beacon emits signals at a frequency of
Bautista-Duran, Marta, Ferreira, Joao, Garcia, Susana, Hase, Hayo, Kallunki, Juha, Lindqvist, Michael, Madkour, Waleed, Probst, Willi, Tangen, Leif-Morten, Tornatore, Vincenza, Winkel, Benjamin   +10 more
openaire   +3 more sources

Evaluation of the first three years of Vgos 24 h sessions using a Kalman filter with C5++

Earth, Planets and Space, 2023
We analyzed the first three years of VGOS 24 h sessions, and evaluated the performance in terms of Earth orientation parameters (EOP) and station positions.
Periklis-Konstantinos Diamantidis, Rüdiger Haas   +1 more
doaj   +1 more source

Empirical Models to Characterize the Structural and Physiochemical Properties of Vacuum Gas Oils with Different Saturate Contents

Resources, 2021
Inter-criteria analysis was employed in VGO samples having a saturate content between 0.8 and 93.1 wt.% to define the statistically significant relations between physicochemical properties, empirical structural models and vacuum gas oil compositional ...
Dicho S. Stratiev, Ivelina K. Shishkova, Rosen K. Dinkov, Ivan P. Petrov, Iliyan V. Kolev, Dobromir Yordanov, Sotir Sotirov, Evdokia Sotirova, Vassia Atanassova, Simeon Ribagin, Krassimir Atanassov, Danail D. Stratiev, Svetoslav Nenov, Liliana Todorova-Yankova, Kamen Zlatanov   +14 more
doaj   +1 more source

Ray tracing-based delay model for compensating gravitational deformations of VLBI radio telescopes

Journal of Geodetic Science, 2022
The precision and the reliability of very long baseline interferometry (VLBI) depend on several factors. Apart from fabrication discrepancies or meteorological effects, gravity-induced deformations of the receiving unit of VLBI radio telescopes are ...
Lösler Michael, Eschelbach Cornelia, Greiwe Ansgar, Brechtken Rainer, Plötz Christian, Kronschnabl Gerhard, Neidhardt Alexander   +6 more
doaj   +1 more source

VGOS Intensives Ishioka-Onsala [PDF]

, 2021
<p>The VLBI Global Observing System (VGOS) is the VLBI contribution to GGOS. During the last years, several VGOS stations have been established, the VGOS observation program has started, and by 2021 VGOS has achieved an operational state involving nine international VGOS stations. Further VGOS stations are ...
Rüdiger Haas, Eskil Varenius, Periklis-Konstantinos Diamantidis, Saho Matsumotu, Matthias Schartner, Tobias Nilsson   +5 more
openaire   +2 more sources