Results 71 to 80 of about 758 (152)

A Machine Learning‐Based Model Infers the Sea Surface Velocity of Surface Water and Ocean Topography (SWOT)

Geophysical Research Letters, Volume 52, Issue 9, 16 May 2025.
Abstract High‐resolution sea surface velocity (SSV) is crucial for advancing our understanding of ocean sub‐mesoscale processes, energy cascades, etc. The recently launched Surface Water and Ocean Topography (SWOT) satellite measures sea surface height with a sub‐mesoscale resolved resolution.
Shuyi Zhou, Jihai Dong, Hong Li, Guangjun Xu, Fanghua Xu   +4 more
wiley   +1 more source

The Current and Future Performance of VGOS [PDF]

, 2023
In this work we investigate the performance\ua0of the 24-hour VGOS sessions observed in 2019–2021.\ua0We look at the station positions and the Earth Orientation\ua0parameters (EOP), and we compare them with\ua0the results from the legacy S/X VLBI ...
Haas, R\ufcdiger, Nilsson, Tobias, Varenius, Eskil   +2 more
core  

Molecularly Defined Lubricant Hydrocarbons from Olefin Metathesis

ChemCatChem, Volume 17, Issue 6, March 17, 2025.
Hydrocarbon‐based lubricants are typically complex mixtures of branched molecules that are challenging to characterize and to relate to macroscopic properties. In this study, we report the synthesis and characterization of molecularly defined lubricants via olefin metathesis and hydrogenation.
Zachariah J. Berkson, Snædís Björgvinsdóttir, Alexander B. Barnes, Roland Riek, Roman Schowner, Michael R. Buchmeiser, Stephen Gibson, Gregory A. Price, Glenn J. Sunley, Christophe Copéret   +9 more
wiley   +1 more source

Rethinking operational VGOS observations

The VLBI Global Observing System (VGOS) was created to meet the ambitious requirements set by the Global Geodetic Observing System (GGOS). Its primary objective is achieving millimeter-level precision while maintaining continuous 24/7 observations. Currently, both aims remain unfulfilled.
Matthias Schartner, Bill Petrachenko, Patrick Charlot, Minghui Xu, Arnaud Collioud, Hana Krasna, Soja Benedikt   +6 more
openaire   +2 more sources

VGOS Wideband Reception and Emerging Competitor Occupations of the VLBI Spectrum [PDF]

, 2019
The VGOS wideband receivers cover a spectrum from 2 to 14 GHz. In this range, many frequencies are allocated to other services. VGOS provides up to four 1 GHz wide sub-bands, which can be tuned to frequencies where detrimental radio frequency ...
Winkel, Benjamin, Vincenza Tornatore, Hase, Hayo, BOLLI, Pietro, Benjamin Winkel, Pietro Bolli, Tornatore, Vincenza, Hayo Hase   +7 more
core  

Processing of resid–VGO mixtures in FCC: Laboratory approach

Applied Catalysis A: General, 2009
Fil: Devard, Alejandra Veronica. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Santa Fe. Instituto de Investigaciones en Catalisis y Petroquimica "Ing. Jose Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones en Catalisis y Petroquimica "Ing.
Devard, Alejandra Veronica, de la Puente, Gabriela, Passamonti, Francisco Javier, Sedran, Ulises Anselmo   +3 more
openaire   +2 more sources

Probing atmospheric turbulence with VLBI residuals: when theory meets observations

Earth, Planets and Space
Geodetic very long baseline interferometry (VLBI) is affected by stochastic fluctuations in atmospheric water vapor, which degrade delay measurements and limit the precision of derived geodetic parameters.
Gaël Kermarrec, Matthias Schartner
doaj   +1 more source

Optimal distribution of VLBI transmitters in the Galileo space segment for frame ties. [PDF]

Earth Planets Space, 2023
Wolf H, Böhm J.
europepmc   +1 more source

The Australian mixed-mode observing program. [PDF]

J Geod, 2022
McCallum L, Chin Chuan L, Krásná H, McCallum J, Böhm J, McCarthy T, Gruber J, Schartner M, Quick J, Rogers A.   +9 more
europepmc   +1 more source

Cross-polarization Gain Calibration of VGOS Antennas

Antennas of the VLBI Global Observing System (VGOS) observe dual linear polarization. Calibration of the complex gain differences between the two polarizers of each antenna is neccesary in order to form Stokes I and to maximize the signal-to-noise ratio ...
Modiri, Sadegh, Schartner, Matthias, Gonzalez Garcia, Javier, Ezequiel Albentosa, Bernhart, Simone, Böhm, Johannes; orcid:, Nothnagel, Axel Gerhard, Pérez‐Díez, Victor, Xu, Minghui, Marti-Vidal, Ivan, Savolainen, Tuomas, Varenius, Eskil; orcid:, Soja, Benedikt; orcid:, Cheung, Chi (Teddy); orcid:0000-0002-4377-0174, Jaron, Frederic Felix Daniel; orcid:   +14 more
core   +2 more sources