Results 81 to 90 of about 758 (152)

A Comparative Survey of Adaptive Codec Solutions for VoIP over Multirate WLANs: A Capacity versus Quality Performance Trade-Off

EURASIP Journal on Wireless Communications and Networking, 2011
In multi-rate WLANs, users can suffer transmission rate changes due to the link adaptation mechanism. This results in a variable capacity channel, which is very hostile for VoIP and can cause serious quality of service (QoS) degradation in all active ...
Sfairopoulou A, Bellalta B, Macian C, Oliver M   +3 more
doaj  

Gravitational deformation of ring-focus antennas for VGOS: first investigations at the Onsala twin telescopes project [PDF]

, 2019
The receiving properties of radio telescopes used in geodetic and astrometric very long baseline interferometry (VLBI) depend on the surface quality and stability of the main reflector.
Lösler, Michael,, Eschelbach, Cornelia,, Greiwe, Ansgar,, Haas, R\ufcdiger, L\uf6sler, Michael, Haas, Rüdiger,, Eschelbach, Cornelia, Greiwe, Ansgar   +7 more
core   +1 more source

Probing a southern hemisphere VLBI Intensive baseline configuration for UT1 determination. [PDF]

Earth Planets Space, 2022
Böhm S, Böhm J, Gruber J, Kern L, McCallum J, McCallum L, McCarthy T, Quick J, Schartner M.   +8 more
europepmc   +1 more source

VLBI measurement of the vector baseline between geodetic antennas at Kokee Park Geophysical Observatory, Hawaii. [PDF]

J Geod, 2021
Niell AE, Barrett JP, Cappallo RJ, Corey BE, Elosegui P, Mondal D, Rajagopalan G, Ruszczyk CA, Titus MA.   +8 more
europepmc   +1 more source

Celestial reference frame 2023 from VGOS sessions

<h2>Context and methodology</h2><ul><li>Celestial reference frame estimated from Very Long Baseline Interferometry VGOS-OPS and VGOS-R&D sessions.</li></ul><h3>Technical details</h3><ul><li> ...
Krasna, Hana
core   +1 more source

An Experiment to Observe GNSS Signals with the Australian VGOS Array

Publications of the Astronomical Society of the Pacific
Abstract This paper introduces a new instrument enabling a novel combination of Earth measuring techniques: direct observations with the radio astronomical instruments to satellites of the global navigation satellite systems (GNSS). Inter-technique biases are a major error source in the terrestrial reference frame.
Lucia McCallum, David Schunck, Jamie McCallum, Tiege McCarthy   +3 more
openaire   +2 more sources

Short-baseline interferometry local-tie experiments at the Onsala Space Observatory. [PDF]

J Geod, 2021
Varenius E, Haas R, Nilsson T.
europepmc   +1 more source

Strategic Estimation of Kinetic Parameters in VGO Cracking

Computers, Materials & Continua, 2019
Fluid catalytic cracking (FCC) unit plays most important role in the economy of a modern refinery that it is use for value addition to the refinery products. Because of the importance of FCC unit in refining, considerable effort has been done by scientists till now on the modelling of this unit for better understanding and improved productivity.
Praveen Ch., Shishir Sinha
openaire   +1 more source

Optimal VLBI baseline geometry for UT1-UTC Intensive observations. [PDF]

J Geod, 2021
Schartner M, Kern L, Nothnagel A, Böhm J, Soja B.   +4 more
europepmc   +1 more source

Status of the Spectrum Management for VGOS

The VLBI Global Observing System (VGOS) utilizes broadband feeds at their radio telescopes in order to observe cosmic radiation in the frequency range of 2-14 GHz. These observations are increasingly in danger by unwanted electromagnetic emissions from telecommunications.
openaire   +2 more sources