نتایج جستجو برای: compressional waves

تعداد نتایج: 114376  

2016
Mike Hettich Karl Jacob Oliver Ristow Martin Schubert Axel Bruchhausen Vitalyi Gusev Thomas Dekorsy

We investigate the viscoelastic properties of confined molecular nano-layers by time resolved optical pump-probe measurements. Access to the elastic properties is provided by the damping time of acoustic eigenmodes of thin metal films deposited on the molecular nano-layers which show a strong dependence on the molecular layer thickness and on the acoustic eigen-mode frequencies. An analytical m...

2003
G. Paesold A. O. Benz

In the course of the energization of electrons to energies of some tens of keV during the impulsive phase of a solar flare, the velocity distribution function of the electrons is predicted to become anisotropic with T e ‖ > T e ⊥ (Here, ‖ and ⊥ denote directions with respect to the background magnetic field). Such a configuration can become unstable to the so-called Electron Firehose instabilit...

Journal: :Physical review letters 2007
Chanjoong Kim Yaqian Liu Angelika Kühnle Stephan Hess Sonja Viereck Thomas Danner L Mahadevan David A Weitz

Colloidal suspensions are susceptible to gravitationally induced phase separation. This can be mitigated by the formation of a particle network caused by depletion attraction. The effectiveness of this network in supporting the buoyant weight of the suspension can be characterized by its compressional modulus. We measure the compressional modulus for emulsion networks induced by depletion attra...

2015
Yuting Duan Paul Sava

For elastic reverse-time migration, one constructs elastic source and receiver wavefields using a source function and multi-component data, and then applies an imaging condition to the reconstructed wavefields. A widely used imaging condition is crosscorrelation of individual wave modes separated in both wavefields, e.g., compressional (P) waves and shear (S) waves. One difficulty in elastic mi...

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