Results 71 to 80 of about 2,072 (163)

A Modular Approach for the Design of Quadruple Ridged Flared Horn Antenna Feeds

IEEE Access
This paper presents the methodology followed for the design of a quad-ridged flared horn (QRFH) feed for the VLBI Global Observing System (VGOS) antennas.
Oscar Garcia-Perez, Felix Tercero, Alejandro Baldominos, Gabriel Gomez-Molina, Alberto Garcia-Merino, David Regajo-Rodriguez, Rocio Sanchez-Montero   +6 more
doaj   +1 more source

Viewpoint Optimization for 3D Graph Drawings

Computer Graphics Forum, Volume 44, Issue 3, June 2025.
Abstract Graph drawings using a node‐link metaphor and straight edges are widely used to represent and understand relational data. While such drawings are typically created in 2D, 3D representations have also gained popularity. When exploring 3D drawings, finding viewpoints that help understanding the graph's structure is crucial.
S. van Wageningen, T. Mchedlidze, A. Telea   +2 more
wiley   +1 more source

Sca2Gri: Scalable Gridified Scatterplots

Computer Graphics Forum, Volume 44, Issue 3, June 2025.
Abstract Scatterplots are widely used in exploratory data analysis. Representing data points as glyphs is often crucial for in‐depth investigation, but this can lead to significant overlap and visual clutter. Recent post‐processing techniques address this issue, but their computational and/or visual scalability is generally limited to thousands of ...
S. Frey
wiley   +1 more source

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

Prototype System for Unmanned Reference Point Determination at the Sub‐Millimeter Level

Earth and Space Science
The determination of reference points for telescopes is crucial for obtaining the local‐tie vector for a multi‐technology co‐located station. Traditional methods suffer from labor‐intensive fieldwork, long execution cycles, and systematic errors due to ...
Zhibin Zhang, Zhikang Wang, Xiaohui Ma, Zhengxiong Sun, Dezhen Xu, Chengli Huang, Guangli Wang, Zhaoxiang Qi   +7 more
doaj   +1 more source

The Establishment of Pointing Model for the Shanghai VGOS Radio Telescope

Journal of Physics, Conference Series, 2019
Using a pointing model is a common practice among radio telescopes devoted to astronomy to correct for mechanical misalignments. Pointing accuracy is one of the most important indicators for the performance of radio telescopes, especially radio ...
Zheng-Xiong Sun, Jin-Qing Wang, Guang-Li Wang   +2 more
semanticscholar   +1 more source

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

Optimizing Dye Wastewater Purification: Ultrasonic and Flotation With Ozonation Synergy

Engineering Reports, Volume 7, Issue 1, January 2025.
The article presents the results of experimental studies of the efficiency of purification of model and real wastewater from dyeing and finishing industries using pneumatic flotation using an ozone‐air mixture instead of air and a combination of ultrasonic treatment and ozonation. ABSTRACT The article presents the results of experimental studies of the
Valentin Romanovski, Marina Pilipenko, Alexandr Dubina, Vitaly Likhavitski, Sergey Volodko, Dmitry Moskovskikh, Elena Romanovskaia   +6 more
wiley   +1 more source

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