Results 71 to 80 of about 1,033,272 (329)

Molecular reorientation in hydrogen-bonding liquids: through algebraic $\sim t^{-3/2}$ relaxation toward exponential decay

open access: yes, 2006
We present a model for the description of orientational relaxation in hydrogen-bonding liquids. The model contains two relaxation parameters which regulate the intensity and efficiency of dissipation, as well as the memory function which is responsible ...
Gelin, M. F., Kosov, D. S.
core   +1 more source

Relaxation processes and entropic traps in the Backgammon model [PDF]

open access: yes, 1996
We examine the density-density correlation function in a model recently proposed to study the effect of entropy barriers in glassy dynamics. We find that the relaxation proceeds in two steps with a fast beta process followed by alpha relaxation.
Angell C A   +12 more
core   +2 more sources

Evolutionary dynamics of the chloroplast genome in Daphne (Thymelaeaceae): comparative analysis with related genera and insights into phylogenetics

open access: yesFEBS Open Bio, EarlyView.
Comparative analysis of chloroplast genomes from 14 genera of Thymelaeaceae revealed variation in gene content, ranging from 128 to 142 genes, primarily influenced by IR expansion/contraction events and pseudogenization of ndhF, ndhI, and ndhG. Two large inversions were detected within the large single‐copy region, including a synapomorphic inversion ...
Abdullah   +8 more
wiley   +1 more source

Stabilization of a linear Timoshenko system with infinite history and applications to the Timoshenko-heat systems

open access: yesElectronic Journal of Differential Equations, 2012
In this article, we, first, consider a vibrating system of Timoshenko type in a one-dimensional bounded domain with an infinite history acting in the equation of the rotation angle.
Aissa Guesmia   +2 more
doaj  

Analytical representations for relaxation functions of glasses [PDF]

open access: yesJournal of Non-Crystalline Solids, 2002
Analytical representations in the time and frequency domains are derived for the most frequently used phenomenological fit functions for non-Debye relaxation processes. In the time domain the relaxation functions corresponding to the complex frequency dependent Cole-Cole, Cole-Davidson and Havriliak-Negami susceptibilities are also represented in terms
Rudolf Hilfer, Rudolf Hilfer
openaire   +4 more sources

Single polymer dynamics in elongational flow and the confluent Heun equation

open access: yes, 2006
We investigate the non-equilibrium dynamics of an isolated polymer in a stationary elongational flow. We compute the relaxation time to the steady-state configuration as a function of the Weissenberg number.
Bird R B   +18 more
core   +2 more sources

Hands‐on protocol for preparing water‐soluble fractions from agri‐food samples for NMR‐based metabolomics analysis

open access: yesFEBS Open Bio, EarlyView.
This research protocol outlines a workflow for nuclear magnetic resonance (NMR)‐based metabolomics in the agri‐food sector. Using two case studies—strawberry leaves (solid matrix) and wine (liquid matrix)—it details the procedures for sample preparation, data acquisition, and processing.
Andrea Fernández‐Veloso   +4 more
wiley   +1 more source

Arbitrary decay for a von Karman system with memory

open access: yesBoundary Value Problems, 2023
In this paper we study the von Karman plate model with long range memory. By using the assumptions on the relaxation function due to Tatar (J. Math. Phys. 52:013502, 2011), we show an arbitrary rate of decay, which is not necessarily of an exponential or
Jum-Ran Kang
doaj   +1 more source

On the relaxation of nonconvex superficial integral functionals

open access: yesJournal de Mathématiques Pures et Appliquées, 2000
We present a new approach to the variational relaxation of functionals $F:D(\mathbb{R}^N;\mathbb{R}^m)\to[0,\infty[$ of the type:$$F(v):=\int_{\mathbb{R}^N}W(\nabla v(x))d\mu(x),$$where $W:\mathbb{R}^{mN}\to[0,\infty[$ is a continuous function with growth conditions of order $p\geq 1$ but not necessarily convex. We essentially study the case when $\mu$
openaire   +4 more sources

Stretched exponential relaxation in the Coulomb glass

open access: yes, 2001
The relaxation of the specific heat and the entropy to their equilibrium values is investigated numerically for the three-dimensional Coulomb glass at very low temperatures. The long time relaxation follows a stretched exponential function, $f(t)=f_0\exp[
Díaz-Sánchez, A., Pérez-Garrido, A.
core   +1 more source

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