Results 21 to 30 of about 153 (130)
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 +14 more
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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 +6 more
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VGOS Intensives Ishioka-Onsala [PDF]
, 2021 <p>The VLBI Global Observing System (VGOS) is the VLBI contribution to GGOS.&#160;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.&#160;Further VGOS stations are ...
Rüdiger Haas +5 more
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Earth, Planets and Space, 2023 VLBI simulation studies are carried out to investigate the impact of any proposed station or strategy on the geodetic parameters, such as Earth Orientation Parameters (EOP) and Terrestrial Reference Frame (TRF). In general, such studies are performed for
Sujata Dhar +5 more
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The Short-Arc Precise Orbit Determination of GEO Satellites Using VLBI and Transfer Ranging
Remote Sensing, 2022 It is important for a geostationary Earth orbit (GEO) satellite to rapidly recover its orbit after a maneuver with short-arc precise orbit determination (POD).
Kai Nan +5 more
doaj +1 more source
Journal of Marine Science and Engineering, 2023 The Yellow Sea Cold Water Mass (YSCWM) is an important component of the hydrodynamic system and it significantly impacts the primary production of the Yellow Sea.
Jing Yang +7 more
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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 +2 more
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VGOS Intensives Ishioka-Onsala [PDF]
, 2020 <p>The VLBI Global Observing System (VGOS) is the VLBI contribution to GGOS.&#160;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.&#160;Further VGOS stations ...
Rüdiger Haas +6 more
openaire +2 more sources
Estimation of VGOS Station Coordinates [PDF]
, 2020 <p>With the number of available VGOS (VLBI Global Observing System) sessions rising, precise coordinates for the participating stations become more important. While station coordinates can be estimated during the VLBI (Very Long Baseline Interferometry) analysis, the definition of the geodetic datum via Not-Net-Rotation (NNR) and
Markus Mikschi +2 more
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Large Satellite Constellations and Their Potential Impact on VGOS Operations [PDF]
, 2023 Large LEO satellite constellations (or so-called Mega-constellations) will significantly change the view of the sky in some radio frequency bands. For VGOS telescopes it is important to understand the potential impact these constellations will have in their operations, what is the risk of its receivers going into non-linear behaviour and how much ...
F. Di Vruno, V. Tornatore
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