Results 1 to 10 of about 170,278 (316)

Sparse Approximation of Currents for Statistics on Curves and Surfaces [PDF]

, 2008
Computing, processing, visualizing statistics on shapes like curves or surfaces is a real challenge with many applications ranging from medical image analysis to computational geometry. Modelling such geometrical primitives with currents avoids feature-based approach as well as point-correspondence method.
Durrleman, Stanley, Pennec, Xavier, Trouvé, Alain, Ayache, Nicholas   +3 more
openaire   +4 more sources

Estimating Ocean Vector Winds and Currents Using a Ka-Band Pencil-Beam Doppler Scatterometer

Remote Sensing, 2018
Ocean surface currents and winds are tightly coupled essential climate variables, and, given their short time scales, observing them at the same time and resolution is of great interest.
Ernesto Rodríguez, Alexander Wineteer, Dragana Perkovic-Martin, Tamás Gál, Bryan W. Stiles, Noppasin Niamsuwan, Raquel Rodriguez Monje   +6 more
doaj   +1 more source

Stability and energy of low current surface discharges on wet surfaces

IEEE Transactions on Dielectrics and Electrical Insulation, 2012
Low current discharges are of concern in the context of predicting the lifetime of outdoor polymeric insulators. The nature of ac surface discharges changes markedly between peak currents of 0.5 mA and 10 mA: the electrical characteristics typically changing from unstable to stable behavior when the peak current increases above 1 mA.
Zhang, X., Rowland, S.; id_orcid 0000-0003-0811-1509   +1 more
openaire   +2 more sources

Synthesis of Surface H-Polarized Currents on an Unclosed Cylindrical Surface

Bulletin of the South Ural State University. Series "Mathematical Modelling, Programming and Computer Software", 2019
The article describes the inverse problem of diffraction of electromagnetic waves, finding surface H-polarized currents on an unclosed cylindrical surface according to a given radiation pattern. The work is based on modelling an operator equation with a small parameter.
Eminov, S.I., Petrova, S.Yu.
openaire   +2 more sources

Error Quantification of Gaussian Process Regression for Extracting Eulerian Velocity Fields from Ocean Drifters

Journal of Marine Science and Engineering
Drifter observations can provide high-resolution surface velocity data (Lagrangian data), commonly used to reconstruct Eulerian velocity fields. Gaussian Process Regression (GPR), a machine learning method based on Gaussian probability distributions, has
Junfei Xia, Mohamed Iskandarani, Rafael C. Gonçalves, Tamay Özgökmen   +3 more
doaj   +1 more source

Validating HF Radar Current Accuracy via Lagrangian Measurements and Radar-to-Radar Comparisons in Highly Variable Surface Currents

Remote Sensing
The validation of HF radar systems remains an area with significant scope for advancement, particularly in terms of linking data quality with system operational parameters, fully utilizing the potential of redundant data (e.g., overlapping radial ...
Bartolomeo Doronzo, Michele Bendoni, Stefano Taddei, Angelo Boccacci, Carlo Brandini   +4 more
doaj   +1 more source

The Winds and Currents Mission Concept

Frontiers in Marine Science, 2019
The Winds and Currents Mission (WaCM) is a proposed approach to meet the need identified by the NRC Decadal Survey for the simultaneous measurements of ocean vector winds and currents. WaCM features a Ka-band pencil-beam Doppler scatterometer able to map
Ernesto Rodríguez, Mark Bourassa, Dudley Chelton, J. Thomas Farrar, David Long, Dragana Perkovic-Martin, Roger Samelson   +6 more
doaj   +1 more source

Deep Learning Improves Global Satellite Observations of Ocean Eddy Dynamics

Geophysical Research Letters
Ocean eddies affect large‐scale circulation and induce a kinetic energy cascade through their non‐linear interactions. However, since global observations of eddy dynamics come from satellite altimetry maps that smooth eddies and distort their geometry ...
Scott A. Martin, Georgy E. Manucharyan, Patrice Klein   +2 more
doaj   +1 more source

Intercomparison of Surface Currents Obtained Using SCHISM and the HF Radar Data in Galveston Bay and Sabine Lake, Texas

Journal of Marine Science and Engineering
This study provides a comprehensive analysis and intercomparison of surface currents, for Galveston Bay and Sabine Lake, Texas, obtained from High-Frequency (HF) radars and SCHISM model.
Cletus O. Ogbodo, Rosa M. Fitzgerald, Christopher Fuller, Jungwoo Lee, Roberto Perea, Javier Polanco-Gonzalez   +5 more
doaj   +1 more source

Comparison of Surface Current Measurement Between Compact and Square-Array Ocean Radar

Journal of Marine Science and Engineering
High-frequency (HF) ocean radars have become essential tools for monitoring surface currents, offering real-time, wide-area coverage with cost-effectiveness.
Yu-Hsuan Huang, Chia-Yan Cheng
doaj   +1 more source