Attenuation and dispersion characteristic of Rayleigh waves in a compressed viscoelastic strip: a comparative study

2020 ◽  
Vol 26 (3) ◽  
pp. 1333-1340
Author(s):  
Manoj Kumar Singh ◽  
Parvez Alam
Keyword(s):  
Comparative Study ◽  
Rayleigh Waves ◽  
Dispersion Characteristic ◽  
Viscoelastic Strip ◽  
Attenuation And Dispersion

Laser-ultrasound detection systems: a comparative study with Rayleigh waves

2000 ◽  
Vol 11 (8) ◽  
pp. 1208-1219 ◽  
Author(s):  
A S Murfin ◽  
R A J Soden ◽  
D Hatrick ◽  
R J Dewhurst
Keyword(s):  
Comparative Study ◽  
Rayleigh Waves ◽  
Laser Ultrasound ◽  
Detection Systems

scholarly journals Surface Roughness Effects on Self-Interacting and Mutually Interacting Rayleigh Waves

Sensors ◽  
2021 ◽  
Vol 21 (16) ◽  
pp. 5495
Author(s):  
Chaitanya Bakre ◽  
Cliff J. Lissenden
Keyword(s):  
Surface Roughness ◽  
Rayleigh Waves ◽  
Second Harmonic ◽  
Material Nonlinearity ◽  
Nonlinearity Parameter ◽  
Roughness Effects ◽  
Sinusoidal Waveform ◽  
Quantitative Understanding ◽  
Relative Nonlinearity ◽  
Attenuation And Dispersion

Rayleigh waves are very useful for ultrasonic nondestructive evaluation of structural and mechanical components. Nonlinear Rayleigh waves have unique sensitivity to the early stages of material degradation because material nonlinearity causes distortion of the waveforms. The self-interaction of a sinusoidal waveform causes second harmonic generation, while the mutual interaction of waves creates disturbances at the sum and difference frequencies that can potentially be detected with minimal interaction with the nonlinearities in the sensing system. While the effect of surface roughness on attenuation and dispersion is well documented, its effects on the nonlinear aspects of Rayleigh wave propagation have not been investigated. Therefore, Rayleigh waves are sent along aluminum surfaces having small, but different, surface roughness values. The relative nonlinearity parameter increased significantly with surface roughness (average asperity heights 0.027–3.992 μm and Rayleigh wavelengths 0.29–1.9 mm). The relative nonlinearity parameter should be decreased by the presence of attenuation, but here it actually increased with roughness (which increases the attenuation). Thus, an attenuation-based correction was unsuccessful. Since the distortion from material nonlinearity and surface roughness occur over the same surface, it is necessary to make material nonlinearity measurements over surfaces having the same roughness or in the future develop a quantitative understanding of the roughness effect on wave distortion.

Author response for "Laminar distribution of cortical projection neurons to the pulvinar: A comparative study in cats and mice"

2020 ◽  
Author(s):  
Bruno Oliveira Ferreira de Souza ◽  
Éve‐Marie Frigon ◽  
Robert Tremblay‐Laliberté ◽  
Christian Casanova ◽  
Denis Boire
Keyword(s):  
Comparative Study ◽  
Author Response ◽  
Projection Neurons ◽  
Cortical Projection ◽  
Laminar Distribution

Structural and functional properties of Escherichia coli-derived nucleoplasmin A comparative study of recombinant and natural proteins

2001 ◽  
Vol 268 (6) ◽  
pp. 1739-1748
Author(s):  
Aitor Hierro ◽  
Jesus M. Arizmendi ◽  
Javier De Las Rivas ◽  
M. Angeles Urbaneja ◽  
Adelina Prado ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Comparative Study ◽  
Functional Properties ◽  
Structural And Functional Properties
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