Results 11 to 20 of about 849 (158)

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.
Arno Rüegg, Grzegorz Kłopotek, Benedikt Soja   +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

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

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

Geodetic data analysis of VGOS experiments

2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS), 2021
Very Long Baseline Interferometry (VLBI) serves as one of the common geodetic methods to define the global reference frames and monitor Earth's orientation variations. The technical upgrade of the VLBI method known as the VLBI Global Observing System (VGOS) includes a critical re-design of the observed frequencies from the dual band mode (S and X band,
Alef, W., Andalsvik, Y., Anderson, J., Bernhart, S., Böhm, J., Boumann, J., Choi, Y., Colomer, F., Engelhardt, G., Flohrer, C., Girdiuk, A., Gonzalez, J., Gruber, J., Haas, R., Hammargren, R., Hohlneicher, M., Jaron, F., Jenie, O., Kareinen, N., LØvhØiden, L., Martinez, E., Marti-Vidal, I., Melnikov, A., Mueskens, A., Neidhardt, A., Nothnagel, A., Petrov, L., Plötz, C., Rottmann, H., Savolainen, T., Schartner, M., Schuh, H., Schueler, T., Small, D., Szomoru, A., Thaller, D., Ullrich, D., Varenius, E., Verkouter, H., De Vicente, P., Wagner, J., Xu, M., Zubko, N.   +42 more
openaire   +2 more sources

VGOS Intensives Ishioka-Onsala [PDF]

, 2020
<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 2020 VGOS has achieved an operational state involving eight international VGOS stations. Further VGOS stations ...
Rüdiger Haas, Eskil Varenius, Grzegorz Klopotek, Periklis-Konstantinos Diamantidis, Saho Matsumoto, Matthias Schartner, Jan Tobias Nilsson   +6 more
openaire   +2 more sources

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

Intracrystalline mesoporosity over Y zeolites. Processing of VGO and resid-VGO mixtures in FCC [PDF]

Catalysis Today, 2017
Abstract Prototypes of FCC catalysts containing 30%wt. Y zeolite with different intracrystalline mesoporosity generated by alkaline desilication, on an inert silica matrix, were tested in cracking a conventional vacuum gasoil (VGO) feedstock, alone and mixed with an atmospheric tower residue (ATR).
García, Juan Rafael, Falco, Marisa Guadalupe, Sedran, Ulises Anselmo   +2 more
openaire   +2 more sources

Imaging VGOS observations and investigating source structure effects [PDF]

Journal of Geophysical Research: Solid Earth, 2020
Abstract The next‐generation, broadband geodetic very long baseline interferometry system, named VGOS, is being developed globally with an aim to achieve 1 mm accuracy for station positions. Currently, the systematic errors in VGOS broadband delays are still about 20 ps.
Xu, Ming H., Savolainen, Tuomas, Zubko, Nataliya, Poutanen, Markku, Lunz, Susanne, Schuh, Harald, Wang, Guang, L.   +7 more
openaire   +4 more sources