Results 251 to 260 of about 201,657 (290)
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Numerical Tools for Semi-Active Optimization of 2D Wave’s Dispersion Into Mechanical System
ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Volume 1, 2010In the context of mid-frequency elastodynamical analysis of periodic structures, the Floquet-Bloch theorem has been recently applied. The latter allows the use of limited-size modeling of a representative cell to characterize waves dispersion properties of the assembled structure.
Manuel Collet +3 more
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Journal of Rheology, 1994
A new rheometrical technique has been developed to determine the mechanical relaxation spectra of viscoelastic materials by measurement of shear wave group and phase velocities in a virtual gap rheometer. The technique’s sensitivity and accuracy in providing relaxation spectra directly from measurements arises from exploitation of marked changes in ...
P. R. Williams, D. J. A. Williams
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A new rheometrical technique has been developed to determine the mechanical relaxation spectra of viscoelastic materials by measurement of shear wave group and phase velocities in a virtual gap rheometer. The technique’s sensitivity and accuracy in providing relaxation spectra directly from measurements arises from exploitation of marked changes in ...
P. R. Williams, D. J. A. Williams
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Journal of Ultrasound in Medicine, 2012
Ultrasound vibrometry can measure the propagation velocity of shear waves in soft tissue noninvasively, and the shear moduli of tissue can be estimated inversely from the velocities at multiple frequencies. It is possible to choose the appropriate model for tissue characterization from mathematical methods and analysis of model behaviors.
Ke, Chen +4 more
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Ultrasound vibrometry can measure the propagation velocity of shear waves in soft tissue noninvasively, and the shear moduli of tissue can be estimated inversely from the velocities at multiple frequencies. It is possible to choose the appropriate model for tissue characterization from mathematical methods and analysis of model behaviors.
Ke, Chen +4 more
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The Dispersion by Hydrogen-Like Atoms in Wave Mechanics
1928In view of the recent experimental determination of the dispersion by atomic hydrogen it seems interesting to apply the theory of dispersion developed by Schrodinger to this case. In this paper we restrict ourselves to an approximation in which terms of the order of relativistic correction are neglected.
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Phase Gradient Mechanism of Self-Focusing and Collapse in Non-Linear Dispersive Travelling Waves
Europhysics Letters (EPL), 1994We present experimental, theoretical and numerical results of a new mechanism of self-focusing and collapse of travelling-wave pulses originating from large non-linear dispersion. We discovered a transition between the mechanism of Bretherton and Spiegel (Bretherton C.S. and Spiegel E. A., Phys. Lett.
E Kaplan, E Kuznetsov, V Steinberg
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Influence of mass density and mechanical properties on the surface acoustic wave velocity dispersion
Microelectronic Engineering, 2006The surface acoustic wave technique is a non-contact, non-destructive opto-acoustic technique used to measure film thickness and material properties, such as elastic properties and density. Simulation of acoustic wave velocity dispersion revealed that the contribution density makes is larger in the first mode, whereas the modulus makes a larger ...
A. Sekiguchi, S.H. Brongersma, K. Maex
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PAMM, 2018
AbstractWe propose a continuum model (the relaxed micromorphic model) to describe band‐gap phenomena in metamaterials.
Marco V. d'Agostino +5 more
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AbstractWe propose a continuum model (the relaxed micromorphic model) to describe band‐gap phenomena in metamaterials.
Marco V. d'Agostino +5 more
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International Journal of Solids and Structures
It is well known from the literature that the phase velocity of waves is directly correlated with the stiffness of the material; however, experimental practice shows that this velocity changes significantly with varying frequencies, despite the fact that the elastic modulus of the material is, by definition, a material constant.
Nicola De Fazio +5 more
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It is well known from the literature that the phase velocity of waves is directly correlated with the stiffness of the material; however, experimental practice shows that this velocity changes significantly with varying frequencies, despite the fact that the elastic modulus of the material is, by definition, a material constant.
Nicola De Fazio +5 more
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Study on Mechanism and Inversion of Zigzag Dispersion Curves in Rayleigh Wave Exploration
Chinese Journal of Geophysics, 2000AbstractThe propagation mechanism of zigzag dispersion curves in the Rayleigh wave exploration is theoretically analyzed. The propagation characteristics and interrelation of the guided waves are studied. It is suggested that the zigzag structure of Rayleigh wave is the result of the many modes generated by the low‐velocity layers or fractures in ...
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