1,604 research outputs found
Large Deviations in Single File Diffusion
We apply macroscopic fluctuation theory to study the diffusion of a tracer in
a one-dimensional interacting particle system with excluded mutual passage,
known as single-file diffusion. In the case of Brownian point particles with
hard-core repulsion, we derive the cumulant generating function of the tracer
position and its large deviation function. In the general case of arbitrary
inter-particle interactions, we express the variance of the tracer position in
terms of the collective transport properties, viz. the diffusion coefficient
and the mobility. Our analysis applies both for fluctuating (annealed) and
fixed (quenched) initial configurations.Comment: Revised version with few corrections. Accepted for publication in
Phys. Rev. Let
Melting of an Ising Quadrant
We consider an Ising ferromagnet endowed with zero-temperature spin-flip
dynamics and examine the evolution of the Ising quadrant, namely the spin
configuration when the minority phase initially occupies a quadrant while the
majority phase occupies three remaining quadrants. The two phases are then
always separated by a single interface which generically recedes into the
minority phase in a self-similar diffusive manner. The area of the invaded
region grows (on average) linearly with time and exhibits non-trivial
fluctuations. We map the interface separating the two phases onto the
one-dimensional symmetric simple exclusion process and utilize this isomorphism
to compute basic cumulants of the area. First, we determine the variance via an
exact microscopic analysis (the Bethe ansatz). Then we turn to a continuum
treatment by recasting the underlying exclusion process into the framework of
the macroscopic fluctuation theory. This provides a systematic way of analyzing
the statistics of the invaded area and allows us to determine the asymptotic
behaviors of the first four cumulants of the area.Comment: 28 pages, 3 figures, submitted to J. Phys.
Dynamical properties of single-file diffusion
We study the statistics of a tagged particle in single-file diffusion, a
one-dimensional interacting infinite-particle system in which the order of
particles never changes. We compute the two-time correlation function for the
displacement of the tagged particle for an arbitrary single-file system. We
also discuss single-file analogs of the arcsine law and the law of the iterated
logarithm characterizing the behavior of Brownian motion. Using a macroscopic
fluctuation theory we devise a formalism giving the cumulant generating
functional. In principle, this functional contains the full statistics of the
tagged particle trajectory---the full single-time statistics, all multiple-time
correlation functions, etc. are merely special cases.Comment: 20 pages, 1 figur
Isolation, characterization and mapping of temperature-sensitive mutants of mycobacteriophage I3
Eighteen temperature-sensitive mutants of mycobacteriophage I3 have been isolated and partially characterized. All the mutants were defective in vegetative replication. Based on temperature shift experiments with the temperature sensitive mutants, the thermosensitive phase of the phage development period has been characterized for each mutant. The genes have been mapped by recombination analysis. The early, continuous and middle genes seem to cluster on the genetic ma
Solution-Processable Graphene Oxide as an Efficient Hole Injection Layer for High Luminance Organic Light-Emitting Diodes
The application of solution-processable graphene oxide (GO) as hole injection
layer in organic light-emitting diodes (OLEDs) is demonstrated. High luminance
of over 53,000 cd m-2 is obtained at only 10 V. The results will unlock a route
of applying GO in flexible OLEDs and other electrode applications.Comment: 14 pages, 3 figures, 1 tabl
Water Loss Under Hot Ambient Temperatures
Male 4 rates were ambient temperature (40 degree,42 degree, and 44 degree calcius) for different durations of time upto a maximum of 3 hours. It was observed that there was a rapid loss in body weight accompanied by considerable increase in body temperature of the animals during the first hour of exposure. Thereafter the rate of body weight loss and increase in body temperature were slow till the end of observation period. Intolerance to heat appears to be more correlated with critical body temperature rather than the extent of dehydration
Influence of formamide on the thermal stability of DNA
The utility of formamide in the denaturation and renaturation of DNA has been examined. The melting temperature of duplex DNA is lowered by 0.6°C per per cent formamide. The depression of melting temperature is independent of the GC content. Formamide also increases the width of the thermal transition. Upto 30%, it does not affect the rate of DNA reassociation
Mangrove vegetation
Mangrove vegetation includes plants ranging from
herbs, shrubs to tall trees. In favourable conditions
the mangrove trees can form dense forests in intertidal
habitats. However; only a few species form a massive
canopy.
The main characteristic features of these special
type of plants are the tidal amplitude, defined by the
species, and their ability to tolerate high salinity and
stress. The majority of the plant groups have
adaptations like prop and stilt roots for fixing support
and the pneumatophores otherwise called the
breathing roots for exchanging gases and the
viviparous germination. In addition to these, the
plants have leathery, dark, ever green leaves with
deeply embeded stomata and aquous tissues
An Efficient Power Control Technique for High-Frequency Resonant Inverter in Induction Heating System
An efficacious and reliable power control technique has been developed which can be used to regulate the output power of a high-frequency full bridge series resonant inverter (HF-FBSRI) in an induction heating (IH) system. In this paper, a modified buck-boost converter is presented to control the DC link/bus voltage which maintains the IH system under resonant mode and optimizes the performance of the IH system. Controlled DC link/bus voltage has been applied to this HF- FBSRI to control the average output power in the IH system. Using this aimed control technique, a wide range of output powers has been controlled and consistent performance of the IH system has been achieved. ZVS switching technique has been used to reduce the switching losses. Varying average power has been obtained at different duty cycles ranging from 0.2 to 0.8 with variable DC link voltage and it has been corroborated using PSIM environment for an IH system rated at 5500W
- …