نتایج جستجو برای: compressional waves

تعداد نتایج: 114376  

2003
Chang-sheng Zha

The complete set of elastic stiffness coefficients of a single crystal of Mg,SiO, in the modified spine1 (wadsleyite) structure are reported at eight pressures from ambient to 14 Gigapascals (GPa). All moduli vary linearly with pressure within the resolution of the data. Third-order Birch-Mumaghan equation fits to aggregate elastic moduli yield values of 170 (k 2) GPa and 4.3 (k 0.2) for the ad...

Journal: :Ultrasound in medicine & biology 2016
Edwin L Carstensen Kevin J Parker Diane Dalecki Denise C Hocking

Biological effects of megahertz-frequency diagnostic ultrasound are thoroughly monitored by professional societies throughout the world. A corresponding, thorough, quantitative evaluation of the archival literature on the biological effects of low-frequency vibration is needed. Biological effects, of course, are related directly to what those exposures do physically to the tissue-specifically, ...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2002
C Y Ho L Yuan M-C Chu P T Leung W Wei

We studied the effects of ionization in a sonoluminescing (SL) bubble within the hydrodynamic framework. The thermodynamic variables and the degrees of ionization inside the bubble throughout an oscillation cycle are obtained by solving the hydrodynamic equations assuming spherical symmetry. Several models are used to compute the emitted radiation, which are then compared with experimental data...

2012
Piero Chiarelli Bruna Vinci Antonio Lanatà Valeria Gismondi Simone Chiarelli

Employing the poroelastic theory of acoustic waves in gels, the ultrasound (US) propagation in a gel medium filled by poroelastic spherical cells is studied. The equation of fast compressional wave, the phase velocity and the attenuation as a function of the elasticity, porosity and concentration of the cells into the gel matrix are investigated. The outcomes of the theory agree with the prelim...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2015
Kyle J Welch Clayton S G Kilmer Eric I Corwin

We use a bath of chaotic surface waves in water to mechanically and macroscopically mimic the thermal behavior of a short articulated chain with only nearest-neighbor interactions. The chaotic waves provide isotropic and random agitation to which a temperature can be ascribed, allowing the chain to passively explore its degrees of freedom in analogy to thermal motion. We track the chain in real...

Journal: :The Journal of the Acoustical Society of America 2010
Benoit Nennig Emmanuel Perrey-Debain Mabrouk Ben Tahar

A mode matching method for predicting the transmission loss of a cylindrical shaped dissipative silencer partially filled with a poroelastic foam is developed. The model takes into account the solid phase elasticity of the sound-absorbing material, the mounting conditions of the foam, and the presence of a uniform mean flow in the central airway. The novelty of the proposed approach lies in the...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2007
Xinlei Sun Xiaodong Song Sihua Zheng Don V Helmberger

Compressional waves that sample the lowermost mantle west of Central America show a rapid change in travel times of up to 4 s over a sampling distance of 300 km and a change in waveforms. The differential travel times of the PKP waves (which traverse Earth's core) correlate remarkably well with predictions for S-wave tomography. Our modeling suggests a sharp transition in the lowermost mantle f...

2012
Zhenya Zhu

The conversion between seismic and electromagnetic energies was discovered in a fluidfilled porous formation. When seismic waves propagate through a fluid-saturated porous formation, relative motion between the pore fluid and the solid matrix is generated and cation motion in the fluid is formed. The streaming electric current induces electromagnetic waves in the formation. There is an opposite...

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