Results 11 to 20 of about 153 (130)

Observing UT1-UTC with VGOS [PDF]

Earth, Planets and Space, 2020
Abstract We present rst results of UT1-UTC determinations using the VLBI Global Observing System (VGOS). During December 2019 through February 2020 a series of 1 hour long observing sessions were performed using the VGOS stations at Ishioka in Japan and the Onsala twin telescopes in Sweden.
Rüdiger Haas, Eskil Varenius, Saho Matsumoto, Matthias Schartner   +3 more
openaire   +3 more sources

A Tri-Band Cooled Receiver for Geodetic VLBI. [PDF]

Sensors (Basel), 2021
This paper shows a simultaneous tri-band (S: 2.2–2.7 GHz, X: 7.5–9 GHz and Ka: 28–33 GHz) low-noise cryogenic receiver for geodetic Very Long Baseline Interferometry (geo-VLBI) which has been developed at Yebes Observatory laboratories in Spain.
López-Pérez JA, Tercero-Martínez F, Serna-Puente JM, Vaquero-Jiménez B, Patino-Esteban M, García-Carreño P, González-García J, García-Pérez Ó, Beltrán-Martínez FJ, Albo-Castaño C, Gallego-Puyol JD, López-Fernández I, Díez-González C, Malo-Gómez I, Barbas-Calvo L, de Vicente-Abad P, López-Fernández JA.   +16 more
europepmc   +2 more sources

Inhibition of Cronobacter sakazakii in an infant simulator of the human intestinal microbial ecosystem using a potential synbiotic. [PDF]

Front Microbiol, 2022
Powdered infant formula (PIF) can be contaminated with Cronobacter sakazakii, which can cause severe illnesses in infants. Synbiotics, a combination of probiotics and prebiotics, could act as an alternative control measure for C.
Ke A, Parreira VR, Farber JM, Goodridge L.   +3 more
europepmc   +2 more sources

Optimal antenna locations of the VLBI Global Observing System for the estimation of Earth orientation parameters. [PDF]

Earth Planets Space, 2020
To support monitoring subtle effects in the Earth system such as a mean sea level rise of 3 mm/year, a next-generation VLBI system, the VLBI Global Observing System (VGOS), has been developed and a new VGOS station network is being built.
Schartner M, Böhm J, Nothnagel A.
europepmc   +2 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. The onboard transmitter for Very Long Baseline Interferometry (VLBI) will allow the observation of the satellite with VLBI radio telescopes.
David Schunck, Lucia McCallum, Guifré Molera Calvés   +2 more
openaire   +3 more sources

Qualitative Analysis of Nitrogen and Sulfur Compounds in Vacuum Gas Oils via Matrix-Assisted Laser Desorption Ionization Time of Flight Mass Spectrometry. [PDF]

Molecules
Analysis of the heavy fractions in crude oil has been important in petroleum industries. It is well known that heavy fractions such as vacuum gas oils (VGOs) include heteroatoms, of which sulfur and nitrogen are often characterized in many cases.
Ueda M, Lee J, Yi H, Lee GH, Kim YJ, Kim GH, Oh K, Yoon SH, Nakabayashi K, Park JI.   +9 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

Initial Results Obtained with the First TWIN VLBI Radio Telescope at the Geodetic Observatory Wettzell. [PDF]

Sensors (Basel), 2015
Geodetic Very Long Baseline Interferometry (VLBI) uses radio telescopes as sensor networks to determine Earth orientation parameters and baseline vectors between the telescopes.
Schüler T, Kronschnabl G, Plötz C, Neidhardt A, Bertarini A, Bernhart S, la Porta L, Halsig S, Nothnagel A.   +8 more
europepmc   +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