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   Articles with "phase velocity" as a keyword



Sixteen-year variation of horizontal phase velocity and propagation direction of mesospheric and thermospheric waves in airglow images at Shigaraki, Japan†

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recommendations! Published in 2017 at "Journal of Geophysical Research"

DOI: 10.1002/2017ja023919

Abstract: We analyzed the horizontal phase velocity of gravity waves and medium-scale traveling ionospheric disturbances (MSTIDs) by using the three-dimensional fast Fourier transform method developed by Matsuda et al. [2014] for 557.7-nm (altitude: 90–100 km) and 630.0-nm (altitude:… read more here.

Keywords: propagation; phase velocity; horizontal phase; propagation direction ... See more keywords

Modal phase velocity compensation in multilayer differentially fed directional couplers

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recommendations! Published in 2020 at "Microwave and Optical Technology Letters"

DOI: 10.1002/mop.32252

Abstract: In this article, we present for the first time the possibility of the modal phase velocity compensation in differentially fed directional couplers designed in inhomogeneous dielectric media. It is shown that in an appropriate, inhomogeneous… read more here.

Keywords: differentially fed; fed directional; velocity compensation; phase velocity ... See more keywords

Estimation of the Lamb wave phase velocity dispersion curves using only two adjacent signals

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recommendations! Published in 2020 at "Composite Structures"

DOI: 10.1016/j.compstruct.2020.113174

Abstract: Abstract Lamb waves are used in various non-destructive testing (NDT) and structural health monitoring (SHM) applications due to their velocity sensitivity to the properties of the material and their propagation over the entire thickness of… read more here.

Keywords: velocity; velocity dispersion; phase velocity; dispersion ... See more keywords

Short-period surface-wave phase velocities across the conterminous United States

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recommendations! Published in 2017 at "Physics of the Earth and Planetary Interiors"

DOI: 10.1016/j.pepi.2017.07.010

Abstract: Abstract Surface-wave phase-velocity maps for the full footprint of the USArray Transportable Array (TA) across the conterminous United States are developed and tested. Three-component, long-period continuous seismograms recorded on more than 1800 seismometers, most of… read more here.

Keywords: across conterminous; phase; surface wave; conterminous united ... See more keywords

Love wave phase velocity models of the southeastern margin of Tibetan Plateau from a dense seismic array

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recommendations! Published in 2017 at "Tectonophysics"

DOI: 10.1016/j.tecto.2017.05.013

Abstract: Abstract Love wave dispersion maps across the southeastern margin of the Tibetan Plateau are obtained using earthquake data recorded by the temporary ChinArray and permanent China Digital Seismic Array. Fundamental mode Love wave phase velocity… read more here.

Keywords: phase; phase velocity; tibetan plateau; margin tibetan ... See more keywords

Near-zero effective impedance with finite phase velocity for sensing and actuation enhancement by resonator pairing

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recommendations! Published in 2018 at "Nature Communications"

DOI: 10.1038/s41467-018-07697-7

Abstract: In spite of the extensive studies of zero-index metamaterials, the realization of zero impedance with finite phase velocity has not been explored. Here, we show that this extreme case, realized by elaborately-tuned paired resonators, can… read more here.

Keywords: sensing actuation; impedance finite; finite phase; phase velocity ... See more keywords
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The effect of the tortuosity of fluid phases on the phase velocity of Rayleigh wave in unsaturated porothermoelastic media

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recommendations! Published in 2020 at "Journal of Thermal Stresses"

DOI: 10.1080/01495739.2020.1748554

Abstract: Abstract Based on the frame of elastic theory for unsaturated porous medium, considering the influence of the thermal effect, the effects of the tortuosity of fluid phases on the phase velocity of Rayleigh wave in… read more here.

Keywords: tortuosity; velocity rayleigh; rayleigh wave; phase velocity ... See more keywords
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Measurement of phase velocity in the functionally graded concrete systems via improved higher-order shear deformation theory

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recommendations! Published in 2024 at "Mechanics of Advanced Materials and Structures"

DOI: 10.1080/15376494.2024.2370034

Abstract: Abstract The measurement of phase velocity (PV) in concrete systems is critically important for civil engineers as it provides essential insights into the material properties and structural integrity of concrete. PV, which refers to the… read more here.

Keywords: higher order; phase velocity; concrete systems; measurement phase ... See more keywords
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Reversal of laser wake phase velocity generates high-power broadband Cherenkov signal

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recommendations! Published in 2021 at "Plasma Physics and Controlled Fusion"

DOI: 10.1088/1361-6587/abe83c

Abstract: As a femtosecond terawatt laser pulse propagates along a positive density gradient within a stratified plasma column, it drives a low-frequency electromagnetic wake wave, the period of electron fluid oscillations in the wake gradually shrinking.… read more here.

Keywords: power; phase velocity; wake; emission ... See more keywords

Phase velocity shifts of shear surface waves in flexoelectric wave-guide clamped on piezomagnetic base

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recommendations! Published in 2024 at "Physica Scripta"

DOI: 10.1088/1402-4896/ad6bc9

Abstract: Surface acoustic wave devices featuring periodic layers of piezomagnetic and piezoelectric-flexoelectric layers are subject to intense investigation. In miniaturized devices, large strain gradients are possible that produce significant flexoelectric fields in piezoelectric components. In the… read more here.

Keywords: piezomagnetic base; phase velocity; surface; velocity ... See more keywords
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A single Rayleigh mode may exist with multiple values of phase-velocity at one frequency

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recommendations! Published in 2020 at "Geophysical Journal International"

DOI: 10.1093/gji/ggaa123

Abstract: Other than commonly assumed in seismology, the phase velocity of Rayleigh waves is not necessarily a single-valued function of frequency. In fact, a single Rayleigh mode can exist with three different values of phase velocity… read more here.

Keywords: frequency; velocity; phase velocity; single rayleigh ... See more keywords