1,039 research outputs found
Instanton approach to the Langevin motion of a particle in a random potential
We develop an instanton approach to the non-equilibrium dynamics in
one-dimensional random environments. The long time behavior is controlled by
rare fluctuations of the disorder potential and, accordingly, by the tail of
the distribution function for the time a particle needs to propagate along the
system (the delay time). The proposed method allows us to find the tail of the
delay time distribution function and delay time moments, providing thus an
exact description of the long-time dynamics. We analyze arbitrary environments
covering different types of glassy dynamics: dynamics in a short-range random
field, creep, and Sinai's motion.Comment: 4 pages, 1 figur
Replica symmetry breaking in long-range glass models without quenched disorder
We discuss mean field theory of glasses without quenched disorder focusing on
the justification of the replica approach to thermodynamics. We emphasize the
assumptions implicit in this method and discuss how they can be verified. The
formalism is applied to the long range Ising model with orthogonal coupling
matrix. We find the one step replica-symmetry breaking solution and show that
it is stable in the intermediate temperature range that includes the glass
state but excludes very low temperatures. At very low temperatures this
solution becomes unstable and this approach fails.Comment: 6 pages, 2 figure
Hall effect in quasi one-dimensional organic conductors
We study the Hall effect in a system of weakly coupled Luttinger Liquid
chains, using a Memory function approach to compute the Hall constant in the
presence of umklapp scattering along the chains. In this approximation, the
Hall constant decomposes into two terms: a high-frequency term and a Memory
function term. For the case of zero umklapp scattering, where the Memory
function vanishes, the Hall constant is simply the band value, in agreement
with former results in a similar model with no dissipation along the chains.
With umklapp scattering along the chains, we find a power-law temperature
dependance of the Hall constant. We discuss the applications to quasi 1D
organic conductors at high temperatures.Comment: Proceedings of the ISCOM conference "Sixth International Symposium on
Crystalline Organic Metals, Superconductors, and Ferromagnets", Key West,
Florida, USA (Sept. 2005), to be plublished in the Journal of Low Temperature
Physic
Structural glass on a lattice in the limit of infinite dimensions
We construct a mean field theory for the lattice model of a structural glass
and solve it using the replica method and one step replica symmetry breaking
ansatz; this theory becomes exact in the limit of infinite dimensions.
Analyzing stability of this solution we conclude that the metastable states
remain uncorrelated in a finite temperature range below the transition, but
become correlated at sufficiently low temperature. We find dynamic and
thermodynamic transition temperatures as functions of the density and construct
a full thermodynamic description of a typical physical process in which the
system gets trapped in one metastable state when cooled below vitrification
temperature. We find that for such physical process the entropy and pressure at
the glass transition are continuous across the transition while their
temperature derivatives have jumps.Comment: 4 pages, 2 figure
Humoral Immune Response to Selected Subgingival Plaque Microorganisms in Insulin–Dependent Diabetic Children
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141979/1/jper0199.pd
Hall Effect in a Quasi-One-Dimensional System
We consider the Hall effect in a system of weakly coupled one-dimensional
chains with Luttinger interaction within each chain. We construct a
perturbation theory in the inter-chain hopping term and find that there is a
power law dependence of the Hall conductivity on the magnetic field with an
exponent depending on the interaction constant. We show that this perturbation
theory becomes valid if the magnetic field is sufficiently large.Comment: 20 page
Effect of Lyophilized Autologous Plasma on Periodontal Healing of Replanted Teeth
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/142100/1/jper0568.pd
Humoral Immunity to Stress Proteins and Periodontal Disease
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141026/1/jper1185.pd
Thermal transport in granular metals
We study the electron thermal transport in granular metals at large tunnel
conductance between the grains, and not too low a temperature , where is the mean energy level spacing for a single grain.
Taking into account the electron-electron interaction effects we calculate the
thermal conductivity and show that the Wiedemann-Franz law is violated for
granular metals. We find that interaction effects suppress the thermal
conductivity less than the electrical conductivity.Comment: Replaced with published versio
Effect of Citric Acid and Various Concentrations of Fibronectin on Healing Following Periodontal Flap Surgery in Dogs
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/142283/1/jper0667.pd
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