Results 41 to 50 of about 1,017 (163)

RADIO VARIABILITY OF THE QUASAR 3C 273 ON THE CENTIMETRIC WAVES -WAVELET-ANALYSIS

open access: yesOdessa Astronomical Publications, 2012
3C 273- has been intensively investigated for many years, since opening of quasars in 1963. Since 1965 on radio telescope RT-26 of Michigan University on frequencies 14.5, 8 and 4.8 GHz long monitoring of this radio source have been carried out.
M. I. Ryabov   +3 more
doaj   +1 more source

Modeling Interactions and Dynamic Saturation Processes in Karst Media

open access: yesWater Resources Research, Volume 62, Issue 2, February 2026.
Abstract The simulation of karst aquifers is highly challenging due to complex conduit‐matrix interactions. This study utilizes KarstFOAM, a high‐fidelity, physics‐based numerical model, to address these challenges. KarstFOAM integrates (a) a unified single‐domain Forchheimer–Darcy–Brinkman–Stokes (FDBS) formulation that transitions naturally across ...
Fuyun Huang   +5 more
wiley   +1 more source

VARIABILITY OF THE EXTRAGALACTIC RADIO SOURCES 3C120, CTA102, DA55 AND OJ287 ON CENTIMETER WAVES AND ITS CONNECTIONS WITH THE DATA OF VLBI OBSERVATIONS

open access: yesOdessa Astronomical Publications, 2012
By data of the long-term monitoring (30- 40 years) fluxes of extragalactic radio sources 3C120, CTA102, DA55 and OJ287 received on the RT-26, University of Michigan present results of data processing with use the wavelet analysis.
M. Ryabov   +3 more
doaj   +1 more source

Die höchsten Oxidationsstufen der Seltenerdelemente und die Probleme mit den Praseodym(+5)‐Verbindungen

open access: yesAngewandte Chemie, Volume 138, Issue 1, 2 January 2026.
Alle Seltenerdelemente bilden bekanntlich tri‐ und auch di‐valente Verbindungen. Wenige tetra‐valente Verbindungen sind auch bekannt; kürzlich wurden die ersten Moleküle und Kristalle mit Praseodym(+5) synthetisiert. Der hier definierte atomare Ionisations‐Quotient IQ legt nahe, dass Ln(+4)‐Verbindungen mit geeigneten Liganden für fast alle 4f‐Elemente
Lian‐Wei Ye   +2 more
wiley   +1 more source

Інформаційні мережеві технології в науці і освіті

open access: yesSistemnì Doslìdženâ ta Informacìjnì Tehnologìï, 2019
Наведено фактори впливу інформаційних технологій на розвиток інформаційного суспільства. Розглянуто напрями застосування інформаційних мережевих технологій у науці та освіті, проблеми розвитку національної науково-освітньої мережі URAN та системи ...
M. Z. Zgurovsky   +2 more
doaj  

VARIATIONS OF IONOSPHERIC SCINTILLATION INDEX FOR THE SHORT-TIME INTERVALS OBSERVED ON THE POWER COSMIC RADIO SOURCES AT THE DECAMETER WAVELENGTHS

open access: yesRadio Physics and Radio Astronomy, 2017
Purpose: Variations of ionospheric scintillation index of the power cosmic radio sources (3С144, 3С274, 3С405, and 3С461) observed for the year-to-day time intervals with the radio telescope at the decameter wavelengths are analyzed.
O. A. Lytvynenko, S. K. Panishko
doaj   +1 more source

Active Fluid Gurney Flaps, Controllable Lift Enhancement Toward Wind Turbine Power Production Regulation

open access: yesWind Energy, Volume 29, Issue 1, January 2026.
ABSTRACT Meeting the rising demand for renewable energy requires innovative solutions to enhance wind power extraction, particularly given demographic and geographic constraints on wind farm deployment. Active high‐lift devices, such as the Active Fluid Gurney Flap (AFGF), offer a promising approach that can dynamically modify aerodynamic performance ...
Mario Lucas, Jorge Saavedra
wiley   +1 more source

Deploiment of the national research and educational network “URAN” in the frame of the state program “information and connunication technology in education and science” for 2006-2010.

open access: yesÌнформаційні технології в освіті, 2009
It is shown results of connection of universities and scientific institutions to URAN network including optic fibers deployment in Ukrainian cities and URAN-GEANT 10 Gbps. It is discussed also means of providing of uninterruptable service to metropolitan
V.G. Galagan   +4 more
doaj  

A STUDY OF IONOSPHERIC REFRACTION OF RADIO WAVES FROM OBSERVATIONS OF COSMIC RADIO SOURCES USING THE RADIO TELESCOPE URAN-4

open access: yesOdessa Astronomical Publications, 2017
The questions of the ionosphere refraction account at radiosources observation on the radiotelescope URAN-4 at 20-25 MHz are considered. The experimental data are received which will be coordinated to results of ionosphere refraction modeling.
V. V. Galanin   +2 more
doaj   +1 more source

Support Structure Modelling in Actuator Line Method Large Eddy Simulations of Wind Turbine Wakes

open access: yesWind Energy, Volume 29, Issue 1, January 2026.
ABSTRACT While advancements in the prediction of wind turbine loads and wakes within the actuator line method large eddy simulation (ALM‐LES) framework have been an active research topic in recent years, the modelling of the tower and nacelle has received comparatively less attention.
Markella Zormpa   +2 more
wiley   +1 more source

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