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On the physics of some known diffusion anomalies in metallic and carbonaceous systemsNechaev, Yury S. January 2009 (has links)
No description available.
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382 |
Molecular dynamics simulation of atomic structure in the vicinity of point defects in FCC and BCC metalsRashetnikava, Alena, Germanov,, Alexander, Valikova, Irina, Nazarov, Andrei January 2009 (has links)
No description available.
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383 |
Simulation of pressure- and temperature dependence of impurity diffusion in BCC metalsValikova, Irina, Nazarov, Andrei January 2009 (has links)
No description available.
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384 |
Use of time resolved X-Ray radiography to measure interdiffusion in liquid metalsZhang, Bo, Griesche, Axel, Meyer, Andreas January 2009 (has links)
No description available.
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385 |
Diffusion in glassy systemsChaudhuri, Pinaki, Berthier, Ludovic, Sastry, Srikanth, Kob, Walter January 2009 (has links)
The transport properties of glass-forming systems have many features that are not found in normal liquids. Among them is a very strong sensitivity of the relaxation times upon a change in temperature and the presence of so-called dynamical heterogeneities.
In this review we discuss these unusual properties and present the results of a simple lattice gas model that helps to understand the origin of these heterogeneities from the microscopic level. Furthermore we discuss a simple analytical model, the continuous time random walk, and show that it allows to describe some aspects of the relaxation dynamics of glass-forming systems on a semi-quantitative level.
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386 |
Mechanical stability: a construction principle for cellsWolff, Lars, Kroy, Klaus January 2009 (has links)
The glassy wormlike chain model is a highly successful phenomenological model recently introduced to describe anomalously slow subdiffusive dynamics in biopolymer networks and living cells. Here we extend this model by proposing a generic scheme how to include nonlinear plastic effects by introducing the possibility of force-dependent opening and closing of internal bonds. Further, we discuss physiological implications of this bond kinetics. Stability arguments lead us to the postulation of a “physiological sheet” in the parameter space. This sheet defines the set of parameters characterizing cells which are flexible enough to perform biological tasks while still being able to bear external perturbations characteristic of their surroundings and their internally generated prestress without damage. At the end of this contribution, we speculate about the connection between prestress and cell stiffness and about the mechanism by which the cell adapts to its mechanical environment.
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387 |
A simple mathematical proof of boltzmann's equal a priori probability hypothesisEvans, Denis J., Searles, Debra J., Williams, Stephen R. January 2009 (has links)
Using the Fluctuation Theorem (FT), we give a first-principles derivation of Boltzmann’s postulate of equal a priori probability
in phase space for the microcanonical ensemble. Using a corollary of the Fluctuation Theorem, namely the Second Law Inequality, we show that if the initial distribution differs from the uniform distribution over the energy hypersurface, then under very wide and commonly satisfied conditions, the initial distribution will relax to that uniform distribution. This result is somewhat analogous to the Boltzmann H-theorem but unlike that theorem, applies to dense fluids as well as dilute gases and also permits a nonmonotonic relaxation to equilibrium. We also prove that in ergodic systems the uniform (microcanonical) distribution is the only stationary, dissipationless distribution for the constant energy ensemble.
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388 |
Diffusion-localization and liquid-glass transitions of a colloidal fluid in porous confinementCoslovich, Daniele, Schwanzer, Dieter, Kahl, Gerhard January 2009 (has links)
No description available.
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389 |
Cluster-resolved dynamic scaling theory and universal corrections for transport on percolating systemsFranosch, Thomas, Höfling, Felix January 2009 (has links)
For a continuum percolation model, it has been shown recentlythat the crossover from pure subdiffusion to normal diffusion extends over five decades in time [1, 2]; in addition, the asymptotic behavior is slowly approached and the large corrections cannot simply be ignored. Thus, it is of general interest to develop a systematic description of universal corrections to scaling in percolating systems.
For percolating systems, we propose a universal exponent relation connecting the leading corrections to scaling of the cluster size distribution with the dynamic corrections to the asymptotic transport behavior at criticality. Our derivation is based on a cluster-resolved scaling theory unifying the scaling of both the cluster size distribution and the dynamics of a random walker.
We corroborate our theoretical approach by extensive simulations for a site percolating square lattice and numerically determine both the static and dynamic correction exponents [3].
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390 |
Propagation of solid-liquid interfaces in disordered linear poresKondrashova, Daria, Khokhlov, Alexey, Valiullin, Rustem, Kärger, Jörg January 2009 (has links)
No description available.
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