Ultrasonic Velocity and Attenuation in Polystyrene Solid

Ultrasonic Attenuation in Solid Helium

A great deal of information about the motion of dislocations in solid helium has been obtained from ultrasonic and interna1 friction measurements. A brief review is given and representative data for 3 ~ e are presented, showing dislocation resonance and damping as well as pinning effects.

Measurement of Ultrasonic Velocity and Attenuation at Elevated Temperatures

Ultrasonic non-destructive testing is a sensitive tool not only for defect detection and evaluation in plant components and structures, but also to characterise microstructural features and for evaluation of mechanical properties. Even though, it provides high sensitivity and reliability for such measurements and very versatile to use at ambient temperatures, the technique fails when it is exte...

INVESTIGATIONS OF THE RELATIONS BEmEN RESIDUAL STRAINS, FABRIC, FRACTURE AND ULTRASONIC ATTENUATION AND VELOCITY IN ROCKS

ULTRASONIC ATTENUATION AND SOUND VELOCITY ANOMALIES BELOW 5 K IN LaAl2

Anelastic anomalies in LaA12 and (La+O.23at%Gd)Al2 below 10K have been studied by MHz attenuation and sound velocity in the normaland superconducting state. Three anelastic processes involving different lattice defects have been identified. Two of them are shown to exhibit a strong dependence on the concentration of unpaired electrons. For one process this is due to changes in theelectronic com...

Magnetoelastic Effects in Nickel Single Crystals Studied by Ultrasonic Attenuation and Velocity

Sound attenuation and velocity in nickel single crystals have been studied as function of frequency (10 to 250 MHz), temperature, strength and direction of external magnetic field along , (110> and , for the three pure wave modes propagating along . The observed effects are found to be specific for each combination of sound mode and field direction, and especially interesting for...