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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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The International Journal of Cardiovascular Imaging, 2017
Some patients with unstable angina and critical stenosis of the left anterior descending coronary artery (LAD) present with Wellens syndrome (WS), i.e., inverted or biphasic T-waves in the anterior precordial leads. We assessed clinical, angiographic, electro- and echocardiographic characteristic of patients with WS.
Ivan, Stankovic +8 more
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Some patients with unstable angina and critical stenosis of the left anterior descending coronary artery (LAD) present with Wellens syndrome (WS), i.e., inverted or biphasic T-waves in the anterior precordial leads. We assessed clinical, angiographic, electro- and echocardiographic characteristic of patients with WS.
Ivan, Stankovic +8 more
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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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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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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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Journal of Geophysical Research: Oceans, 1988
A direct investigation focussed on the vicinity of the interface of bubble populations generated by different breaking wave fields in a wind‐water simulation facility is presented. Bubble size spectrum over a diameter range 60 μ ≤ d < 3000 μ, obtained from a laser‐based single‐particle technique is given for different depths in the vicinity of the ...
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A direct investigation focussed on the vicinity of the interface of bubble populations generated by different breaking wave fields in a wind‐water simulation facility is presented. Bubble size spectrum over a diameter range 60 μ ≤ d < 3000 μ, obtained from a laser‐based single‐particle technique is given for different depths in the vicinity of the ...
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Attenuation and Dispersion of Elastic Waves in Porous Rocks: Mechanisms and models
2022Boris Gurevich, José M. Carcione
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