Stress Wave attenuation in SiC3D/Al Composite

Stress wave attenuation in shock-damaged rock

The velocity and attenuation of ultrasonic stress waves in gabbroic rock samples (San Marcos, California) subjected to shock loading in the 2 GPa range were studied. From P wave velocity measurements we determined the damage parameter Dp and crack density e of the samples and related these to the attenuation coefficient (quality factor) under dynamic strains of 2 x 10 -? and at a frequency of 2...

Seismic Wave Attenuation in Carbonates

On effective attenuation in multiscale composite media

Experiments show that waves propagating through the earth’s crust experience frequency-dependent attenuation. Three regimes have been identified with specific attenuation properties: the low-, mid-, and high-frequency regimes with attenuation in general increasing with frequency. This paper shows how the observed behavior can be explained via theory for waves in random media. It considers multi...

Attenuation of Swimming-induced Oxidative Stress by Composite Herbal Supplement on Antioxidative Parameters in Male Rat

The present study has been designed to find out the antioxidant potency of composite methanolic extract on swimming-induced oxidative damage on packed erythrocytes in Wistar strain male albino rat. Extract was administered at the dose of 40 mg/100 g body weight/day/rat orally by gavage for 15 days period to experimentation followed by cotreatment of the aforesaid extract at the same dose for 28...

Fractional Wave Equations with Attenuation.

Fractional wave equations with attenuation have been proposed by Caputo [5], Szabo [27], Chen and Holm [7], and Kelly et al. [11]. These equations capture the power-law attenuation with frequency observed in many experimental settings when sound waves travel through inhomogeneous media. In particular, these models are useful for medical ultrasound. This paper develops stochastic solutions and w...