Wave hierarchies in viscoelasticity

Wave hierarchies in viscoelasticity

Wave splitting in linear viscoelasticity

The problem of transient propagation in a homogeneous linear viscoelastic solid is investigated by means of the wave splitting technique. Two mechanical viscoelastic models are considered in particular, corresponding respectively to a single Maxwell element and to the series of a Maxwell element plus a Kelvin element. Analytical solutions for the split field are evaluated in terms of the wave p...

Diffusing-wave-spectroscopy measurements of viscoelasticity of complex fluids

We present a new use of dynamic light scattering that permits the determination of the viscoelastic behavior of a complex fluid. By describing the motion of a scattering particle in a viscoelastic medium in terms of a generalized Langevin equation with a memory function, we relate the time evolution of its mean-square displacement to the frequency-dependent storage and loss moduli of the medium...

Politeness Orientation in Social Hierarchies in Urdu

The present research is aimed at investigating how the politeness of the speakers of Urdu is influenced by their relative social status in society. The researcher took politeness theory of Brown and Levinson (1978, 1987) as a model. To observe politeness of Urdu speakers, speech act of apology with different strategies was selected. A Discourse Completion Task (DCT) was used as an instrument to...

The relation between arterial viscoelasticity and wave propagation in the canine femoral artery in vivo.

The influence of arterial dimensions and viscoelasticity on pulse wave propagation has been expressed in many theoretical models of blood flow in arteries, but few experimental tests of these theories in vivo have been reported. The measurements required for such tests include not only the arterial viscoelasticity, diameter, and wall thickness, but also the true propagation coefficients and imp...