scholarly journals Relaxation dynamics of an elastic string in random media

2009 ◽  
Vol 80 (4) ◽  
Author(s):  
Jae Dong Noh ◽  
Hyunggyu Park
Keyword(s):  
Random Media ◽  
Relaxation Dynamics ◽  
Elastic String

scholarly journals Non–equilibrium relaxation of an elastic string in random media

2005 ◽  
Vol 131 ◽  
pp. 189-190
Author(s):  
A. B. Kolton ◽  
A. Rosso ◽  
T. Giamarchi
Keyword(s):  
Random Media ◽  
Elastic String ◽  
Non Equilibrium

Critical Beha vior of a Depinning Dislocation

2000 ◽  
Vol 652 ◽  
Author(s):  
Stefano Zapperi ◽  
Michael Zaiser
Keyword(s):  
Stress Field ◽  
Long Range ◽  
Critical Exponents ◽  
Critical Stress ◽  
Threshold Stress ◽  
Random Media ◽  
Analytical Estimate ◽  
Depinning Transition ◽  
Elastic String ◽  
Theoretical Predictions

ABSTRACTThe dynamics of dislocations at yield can be understood within the framew ork of the depinning transition of elastic manifolds in random media. Close to the threshold stress for their long-range motion, the geometry and dynamics of dislocations are characterized by a set of critical exponents. We consider a single flexible dislocation gliding through a random stress field, taking in to account long-range self stresses, and estimate the critical stress where depinning takes place. Simulations of a discretized lattice model confirm the analytical estimate and yield numerical values of the critical exponents which are in agreement with theoretical predictions for an elastic string mo ving on a plane.

Random media with temperature controlled connectivity

1992 ◽  
Vol 2 (5) ◽  
pp. 503-510 ◽  
Author(s):  
F. Carmona ◽  
E. Valot ◽  
L. Servant ◽  
M. Ricci
Keyword(s):  
Random Media ◽  
Temperature Controlled

Relaxation dynamics in confined glasses

2000 ◽  
Vol 10 (PR7) ◽  
pp. Pr7-227-Pr7-232 ◽  
Author(s):  
B. Jérôme ◽  
E. Cecchetto ◽  
N. R. de Souza ◽  
A. L. Demirel
Keyword(s):  
Relaxation Dynamics

Investigation of particulate systems using optical pathlength spectroscopy

2000 ◽  
Vol 627 ◽  
Author(s):  
Gabriel Popescu ◽  
Aristide Dogariu
Keyword(s):  
Path Length ◽  
Random Media ◽  
Michelson Interferometer ◽  
Industrial Process ◽  
Optical Path Length ◽  
Industrial Applications ◽  
Optical Path ◽  
Interference Signal ◽  
Optical Length ◽  
Reference Mirror

ABSTRACTIn many industrial applications involving granular media, knowledge about the structural transformations suffered during the industrial process is desirable. Optical techniques are noninvasive, fast, and versatile tools for monitoring such transformations. We have recently introduced optical path-length spectroscopy as a new technique for random media investigation. The principle of the method is to use a partially coherent source in a Michelson interferometer, where the fields from a reference mirror and the sample are combined to obtain an interference signal. When the system under investigation is a multiple-scattering medium, by tuning the optical length of the reference arm, the optical path-length probability density of light backscattered from the sample is obtained. This distribution carries information about the structural details of the medium. In the present paper, we apply the technique of optical path-length spectroscopy to investigate inhomogeneous distributions of particulate dielectrics such as ceramics and powders. The experiments are performed on suspensions of systems with different solid loads, as well as on powders and suspensions of particles with different sizes. We show that the methodology is highly sensitive to changes in volume concentration and particle size and, therefore, it can be successfully used for real-time monitoring. In addition, the technique is fiber optic-based and has all the advantages associated with the inherent versatility.

Sign in / Sign up

Export Citation Format

Share Document