A method for measurement of the nonlinearity parameter B / A of liquids by means of a spherical finite-amplitude photoacoustic pulse is described. The photoacoustic pulse is generated by the laser-induced breakdown mechanism. The relation between B / A and the decrement of rise time of wavefront of the acoustic pulse during its propagation is given. The nonlinearity parameter of water is obtain...

21 Waves in Cold Plasmas: Two-Fluid Formalism 1 21.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 21.2 Dielectric Tensor, Wave Equation, and General Dispersion Relation . . . . . 3 21.3 Two-Fluid Formalism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 21.4 Wave Modes in an Unmagnetized Plasma . . . . . . . . . . . . . . . . . . . . 7 2...

Ultrasonic wave propagation in water-saturated bovine cancellous (spongy) bone has been experimentally studied in vitro by a pulse transmission technique. In earlier investigation, fast and slow longitudinal waves have been clearly observed when the acoustic wave propagates in the direction of the trabeculm orientation. In the present study, the propagation speeds of the fast and the slow waves...

We investigate theoretically using the finite difference time domain method acoustic wave propagation along waveguides in three-dimensional phononic crystals constituted of lead spherical inclusions on a face-centered cubic lattice embedded in an epoxy matrix. The transmission spectra of the perfect phononic crystal for transverse and longitudinal acoustic waves are shown to depend strongly on ...

Linear acoustic wave-splitting is an often used tool in describing sound-wave propagation through earth's subsurface. Earth's subsurface is in general anisotropic due to the presence of water-filled porous rocks. Due to the complexity and the implicitness of the wave-splitting solutions in anisotropic media, wave-splitting in seismic experiments is often modeled as isotropic. With the present p...

Surface acoustic wave (SAW) excitation of an acoustic field in a trapezoidal glass microfluidic channel for particle manipulation in continuous flow has been demonstrated. A unidirectional interdigital transducer (IDT) on a Y-cut Z-propagation lithium niobate (LiNbO3) substrate was used to excite a surface acoustic wave at approximately 35 MHz. An SU8 layer was used for adhesive bonding of the ...

The aim of the paper is a theoretical analysis of acoustic waves propagation through a bubble layer. The mathematical model of the pressure propagation in bubbly liquid layer is constructed by the linear non-dissipative wave and the Rayleigh-Plesset equations. The acoustic pressure field inside the layer, the reflected and transmitted waves, and suitable power spectral density are studied. Nume...