Acoustic waves in a slightly compressible fluid saturating porous periodic structure are studied using two complementary approaches: 1) the homogenization (PH) method provides effective model equations for general dynamic problem imposed bounded medium, 2) harmonic acoustic an infinite medium Floquet-Bloch (FB) wave decomposition. In contrast with usual simplifications, advection phenomenon of ...

Surface acoustic wave (SAW) velocity spectroscopy has been long considered to be one of the leading candidates for nondestructive characterization of surface-treated metals because of its ability to probe the material properties at different penetration depths depending on the inspection frequency. We developed a high-precision laser-ultrasonic technique to study the feasibility of SAW dispersi...

Acoustic phonons have recently been posited as playing an integral role in explaining the half-quantized thermal Hall effect $\alpha$-RuCl$_3$. Therefore, we present much needed inelastic x-ray scattering measurements of its acoustic phonon dispersion, along with calculations using frozen-phonon method. We also discuss a temperature study which conclusively shows first-order structural transiti...

The theoretical sensitivity of Love wave and layer-guided shear horizontal acoustic plate mode ~SH-APM! sensors for viscoelastic guiding layers and general loading by viscoelastic materials is developed. A dispersion equation previously derived for a system of three rigidly coupled elastic mass layers is modified so that the second and third layers can be viscoelastic. The inclusion of viscoela...