7,906 research outputs found
Equations of structural relaxation
In the mode coupling theory of the liquid to glass transition the long time
structural relaxation follows from equations solely determined by equilibrium
structural parameters. The present extension of these structural relaxation
equations to arbitrarily short times on the one hand allows calculations
unaffected by model assumptions about the microscopic dynamics and on the other
hand supplies new starting points for analytical studies. As a first
application, power-law like structural relaxation at a glass-transition
singularity is explicitly proven for a special schematic MCT model.Comment: 11 pages, 3 figures; talk given at the Seventh international Workshop
on disordered Systems, Molveno, Italy, March 199
Localization, anomalous diffusion and slow relaxations: a random distance matrix approach
We study the spectral properties of a class of random matrices where the
matrix elements depend exponentially on the distance between uniformly and
randomly distributed points. This model arises naturally in various physical
contexts, such as the diffusion of particles, slow relaxations in glasses, and
scalar phonon localization. Using a combination of a renormalization group
procedure and a direct moment calculation, we find the eigenvalue distribution
density (i.e., the spectrum) and the localization properties of the eigenmodes,
for arbitrary dimension. Finally, we discuss the physical implications of the
results
The field inside a random distribution of parallel dipoles
We determine the probability distribution for the field inside a random
uniform distribution of electric or magnetic dipoles.
For parallel dipoles, simulations and an analytical derivation show that
although the average contribution from any spherical shell around the probe
position vanishes, the Levy stable distribution of the field is symmetric
around a non-vanishing field amplitude.
In addition we show how omission of contributions from a small volume around
the probe leads to a field distribution with a vanishing mean, which, in the
limit of vanishing excluded volume, converges to the shifted distribution.Comment: RevTeX, 4 pages, 3 figures. Submitted to Phys. Rev. Let
Collaborative Management of the Glen Canyon Dam: The Elevation of Social Engineering Over Law
Constitutional and Congressional Requirements Directing Public Lands Decisionmaking
15 pages.
Contains references
First Honorary Medal of the Signal Transduction Society (STS) and 'CELL COMMUNICATION AND SIGNALING' awarded to Professor Anthony J. (Tony) Pawson
Constitutional and Congressional Requirements Directing Public Lands Decisionmaking
15 pages.
Contains references
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