Results 281 to 290 of about 9,836,724 (331)
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Circularly Polarized Spin‐Selectivity Absorbing Coding Phase Gradient Metasurface for RCS Reduction
Advanced Theory and Simulations, 2020A novel spin‐selectivity absorbing coding phase gradient metasurface (SACPGM) is proposed and demonstrated. The coding element consists of spin‐selectivity absorbing unit cells, which exhibit different absorption characteristics for left‐handed ...
Maochang Feng +13 more
semanticscholar +1 more source
Stripmap phase gradient autofocus
Oceans 2003. Celebrating the Past ... Teaming Toward the Future (IEEE Cat. No.03CH37492), 2003Current sonar autofocus techniques for blur removal originate in the radar community but have not provided a complete solution for Synthetic Aperture Sonar (SAS) imagery. The wide-beam, wide-band nature of SAS imagery makes implementation of Synthetic Aperture Radar (SAR) autofocus techniques difficult.
H.J. Callow, M.P. Hayes, P.T. Gough
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Low-RCS Beam-Steering Antenna Based on Reconfigurable Phase Gradient Metasurface
IEEE Antennas and Wireless Propagation Letters, 2019A beam-steering antenna with low radar cross section (RCS) based on a reconfigurable phase gradient metasurface (PGM) is proposed in this letter. The PGM loaded with p-i-n diodes is designed as a tunable radome to steer the beam, improve the gain, and ...
Jun Yu, Wen Jiang, S. Gong
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Vapor-Phase Plotting of Organosilane Chemical Gradients
Langmuir, 2018Vapor-phase plotting of organosilane-based self-assembled monolayer (SAM) gradients is demonstrated for the first time. Patterned SAMs are formed by delivering gas-phase organotrichlorosilane precursors to a reactive silica surface using a heated glass capillary.
Judith Bautista-Gomez +4 more
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Manipulation of seismic Rayleigh waves using a phase-gradient rubber metasurface
, 2020In this paper, a new method is proposed to manipulate seismic Rayleigh waves using phase-gradient metasurfaces.
Yanbin He, Tianning Chen, Xinpei Song
semanticscholar +1 more source
Fresnel diffraction due to phase gradient singularity
Optics Letters, 2018In this Letter, a singularity in the phase gradient is introduced as a new origin of the diffraction from phase objects. The continuity in the amplitude and phase of the wave and the singularity in the phase gradient are assumed to describe this phenomenon.
Ehsan A. Akhlaghi +2 more
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1989
The y gradient is applied in the direction perpendicular to the coronal plane. Now it would seem that we could be able to use frequency in this direction just as we did for the x axis. However, if we did that, then we would not be able to uniquely specify whether a given frequency belonged to the x or the y axis, and the computer would get confused and
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The y gradient is applied in the direction perpendicular to the coronal plane. Now it would seem that we could be able to use frequency in this direction just as we did for the x axis. However, if we did that, then we would not be able to uniquely specify whether a given frequency belonged to the x or the y axis, and the computer would get confused and
openaire +1 more source
Peak compression in reversed-phase gradient elution
Journal of Chromatography A, 2006Previous reports suggest that peak widths in linear gradient elution are consistently larger than predicted by theory; however, if gradient compression is ignored, experiment and theory are in reasonable agreement. This suggests that gradient compression might represent an incorrect or poorly understood concept.
Uwe D, Neue +2 more
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Gradient theory of phase transitions in composite media
Proceedings of the Royal Society of Edinburgh: Section A Mathematics, 2003We study the behaviour of non-convex functionals singularly perturbed by a possibly oscillating inhomogeneous gradient term, in the spirit of the gradient theory of phase transitions. We show that a limit problem giving a sharp interface, as the perturbation vanishes, always exists, but may be inhomogeneous or anisotropic. We specialize this study when
ANSINI, NADIA +2 more
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Improved reversed-phase gradient retention modeling
Journal of Chromatography A, 2010An empirical nonlinear equation is used to describe the relationship between chromatographic retention and solvent composition in both isocratic and gradient chromatography. The integration of the gradient equation can be solved with our equation, allowing a simple transition between isocratic and gradient conditions.
Uwe Dieter, Neue, Hans-Joachim, Kuss
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