Results 31 to 40 of about 211,747 (260)

A Passive Radar System for Monitoring of Coastal Areas Ship Traffic Using Satellite Illumination Signals

Известия высших учебных заведений России: Радиоэлектроника, 2020
Introduction. Increasing requirements for improving of information systems for ensuring navigation safety in coastal areas of marine waters determine the search of new engineering and scientific solutions.
Nguyen Van Quan
doaj   +1 more source

Local finite-time Lyapunov exponent, local sampling and probabilistic source and destination regions [PDF]

Nonlinear Processes in Geophysics, 2015
The finite-time Lyapunov exponent (FTLE) is a powerful Lagrangian concept widely used for describing large-scale flow patterns and transport phenomena. However, field experiments usually have modest scales.
A. E. BozorgMagham, S. D. Ross, D. G. Schmale III   +2 more
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Lagrangian Based Methods for Coherent Structure Detection [PDF]

, 2015
There has been a proliferation in the development of Lagrangian analytical methods for detecting coherent structures in fluid flow transport, yielding a variety of qualitatively different approaches. We present a review of four approaches and demonstrate
Ma T., Michael R. Allshouse, Tang W., Thomas Peacock, Ulam S.   +4 more
core   +1 more source

Design and Performance Prediction of a Dual-Band Coupled-Fed Dipole Array Antenna for PCL Systems in the VHF Band

Applied Sciences, 2020
This article proposes the design of a dual-band coupled-fed dipole antenna for passive coherent location (PCL) systems in the very high frequency (VHF) band.
Sungsik Wang, Hongsuk Shim, Hosung Choo
doaj   +1 more source

Three-dimensional structure of a low-Reynolds-number turbulent boundary layer [PDF]

, 2004
A low-Reynolds-number zero-pressure-gradient incompressible turbulent boundary layer was investigated using a volumetric imaging technique. The Reynolds number based on momentum thickness was 700.
Delo, C., Kelso, R., Smits, A.
core   +2 more sources

Detection, Localization and Classification of Multiple Mechanized Ocean Vessels over Continental-Shelf Scale Regions with Passive Ocean Acoustic Waveguide Remote Sensing

Remote Sensing, 2018
Multiple mechanized ocean vessels, including both surface ships and submerged vehicles, can be simultaneously monitored over instantaneous continental-shelf scale regions >10,000 km 2 via passive ocean acoustic waveguide remote sensing.
Chenyang Zhu, Heriberto Garcia, Anna Kaplan, Matthew Schinault, Nils Olav Handegard, Olav Rune Godø, Wei Huang, Purnima Ratilal   +7 more
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Visualization of electrographic flow fields of increasing complexity and detection of simulated sources during spontaneously persistent AF in an animal model

Frontiers in Cardiovascular Medicine, 2023
BackgroundMapping algorithms have thus far been unable to localize triggers that serve as drivers of AF, but electrographic flow (EGF) mapping provides an innovative method of estimating and visualizing in vivo, near real-time cardiac wavefront ...
Melissa H. Kong, Steven Castellano, Peter Ruppersberg, Ken S. Lizama, Boaz Avitall   +4 more
doaj   +1 more source

Extraction of coherent structures in a rotating turbulent flow experiment

, 2004
The discrete wavelet packet transform (DWPT) and discrete wavelet transform (DWT) are used to extract and study the dynamics of coherent structures in a turbulent rotating fluid.
Eran Sharon, Harry L. Swinney, I. Daubechies, J. Pedlosky, Jori E. Ruppert-Felsot, L. N. Trefethen, M. Raffel, M. V. Wickerhauser, Olivier Praud, P. Holmes, T. Acharya, W. H. Press   +11 more
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Quantum metamaterial without local control [PDF]

, 2013
A quantum metamaterial can be implemented as a quantum coherent 1D array of qubits placed in a transmission line. The properties of quantum metamaterials are determined by the local quantum state of the system.
Nori, Franco, Satanin, A. M., Savel'ev, S., Shvetsov, A., Zagoskin, A. M.   +4 more
core   +2 more sources

MEG responses to the perception of global structure within glass patterns. [PDF]

PLoS ONE, 2010
The perception of global form requires integration of local visual cues across space and is the foundation for object recognition. Here we used magnetoencephalography (MEG) to study the location and time course of neuronal activity associated with the ...
Jennifer B Swettenham, Stephen J Anderson, Ngoc J Thai   +2 more
doaj   +1 more source