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The potential of ultrasonic techniques for the separation and concentration of particles within a fluid has been investigated in some detail in recent years. Devices for effecting such separation typically consist of a piezoceramic transducer driving into a matching layer, fluid layer and reflector
A nuclear magnetic resonance imaging (MRI) method is described that allows noninvasive, quantitative mapping of medical ultrasound (US) fields in tissue. Application of a resonant magnetic field gradient operating at the US frequency permits detection of nanometer motions associated with ultrasound,
Thermodynamical properties of ultrathin films were analysed using Green's function method. Mean-square of the molecular displacements, mean-square of the velocities and the phonon contribution to the specific heat of the thin films were calculated. A comparison with crystal bulk has shown that therm
Compressional seismic P!waves\ propagating in poroelastic\ ~uid saturated\ laminated sediments are strongly a}ected by the medium heterogeneity[ Here\ simple analytical expressions for the P!wave phase velocity and attenuation coe.cient are derived[ Both are functions of frequency and statistical me