نتایج جستجو برای: relaxation process
تعداد نتایج: 1380088 فیلتر نتایج به سال:
Abstract The non-equilibrium process of transfer the momentum polymer media with an evolving nonequilibrium relaxation microstructure is considered. For basic conditions deformation, regularities for structural and dynamic components stress tensor conjugate forces are obtained analyzed, which consistent experiment.
Binary water mixtures usually display a water relaxation (process II) which can be studied by broadband dielectric spectroscopy (BDS) at subzero temperatures. In a large collection of binary water mixtures, a slight increase of the relaxation strength is observed for low water concentration, whereas a faster increase is seen above a critical concentration. The assumption behind this result is t...
Background and Aim : Insomnia is one of the most prevalent disorders of pregnancy that can results in many problems before, during and after delivery. Insomnia management should be attempted to provide comfort during pregnancy. The aim of study was to determine the effect of relaxation on insomnia during third trimester among pregnant women. Material and Method : This was a randomized field...
Introduction : Chronic insomnia is a common complaint of hemodialysis patients. The present study has conducted to determine the effect of progressive muscle relaxation on insomnia severity of patients undergoing hemodialysis in hospitals affiliated with Shaheed Beheshti University of Medical Sciences in year 2010. Method : This study is a before and after quasi-experimental study. using pu...
In this paper the properties of waveform relaxation are studied when applied to the dynamical system generated by an autonomous ordinary differential equation. In particular, the effect of the waveform relaxation on the invariant sets of the flow is analysed. Windowed waveform relaxation is studied, whereby the iterative technique is applied on successive time intervals of length T and a fixed,...
Although it has been experimentally shown that the addition of short-fibers slows the stress relaxation process in composites, the underlying phenomenon is complex and not well understood. Previous studies have proposed that fibers slow the relaxation process by either hindering the movement of nearby polymeric chains or by creating additional covalent bonds at the fiber-matrix interface that m...
A relaxation process, with the associated phenomenology of sound attenuation and sound velocity dispersion, is found in a simulated harmonic Lennard-Jones glass. We propose to identify this process with the so-called microscopic (or, instantaneous) relaxation process observed in real glasses and supercooled liquids. A model based on the memory function approach accounts for the observation and ...
Molecular dynamics simulations of a melt of freely rotating chains of 1,4-polybutadiene (FRC-PBD) have been performed over a wide range of temperature. Removal of the dihedral barriers in FRC-PBD allows for complete resolution of the Johari-Goldstein beta process from the primary alpha process in the simulation time window. We find that relaxation in the beta regime occurs as the result of larg...
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