22,356 research outputs found
Explosive condensation in a mass transport model
We study a far-from-equilibrium system of interacting particles, hopping
between sites of a 1d lattice with a rate which increases with the number of
particles at interacting sites. We find that clusters of particles, which
initially spontaneously form in the system, begin to move at increasing speed
as they gain particles. Ultimately, they produce a moving condensate which
comprises a finite fraction of the mass in the system. We show that, in
contrast with previously studied models of condensation, the relaxation time to
steady state decreases as an inverse power of ln L with system size L and that
condensation is instantenous for L-->infinity.Comment: 5 pages, 5 figures, minor changes, references adde
An example of the links between thrust tectonics and sedimentation: the paleogene barreme basin, SE France
Mémoire HS n° 13 - Géologie Alpine : Le détritisme dans le Sud-Est de la France - Colloque Association des Géologues du Sud-est - Grenoble 11-12 décembre 1986Without abstrac
Welding of precipitation-hardening stainless steels
Welding of precipitation hardening stainless steel
The effect of neuronal conditional knock-out of peroxisome proliferator-activated receptors in the MPTP mouse model of Parkinson's disease
This study was supported by Parkinsonâs Disease Foundation (IRGP 09-11 (P.T.)), the Royal Society (2006/R1 (P.T.)), the Wellcome Trust (WT080782MF (P.T.)), the Biotechnology and Biological Sciences Research Council (P.T. and H.L.M.), the National Institutes of Health (DK057978) (R.M.E.), and by grants from the Leona M. and Harry B. Helmsley Charitable Trust (R.M.E.), the Glenn Foundation for Medical Research (R.M.E.), and the Ellison Medical Foundation (R.M.E.). R.M.E. is an investigator at the Howard Hughes Medical Institute and March of Dimes Chair in Molecular and Developmental Biology at the Salk Institute. The authors would like to thank Lynne J. Hocking, University of Aberdeen, for her assistance with the statistics. We are grateful to the staff of the Medical Research Facility for their help with the animal care and the microscopy core facility at the University of Aberdeen for the use of microscopy equipment.Peer reviewedPublisher PD
The effects of polydispersity and metastability on crystal growth kinetics
We investigate the effect of metastable gas-liquid (G-L) separation on
crystal growth in a system of either monodisperse or slightly size-polydisperse
square well particles, using a simulation setup that allows us to focus on the
growth of a single crystal. Our system parameters are such that, inside the
metastable G-L binodal, a macroscopic layer of the gas phase "coats" the
crystal as it grows, consistent with experiment and theoretical free energy
considerations. Crucially, the effect of this metastable G-L separation on the
crystal growth rate depends qualitatively on whether the system is
polydisperse. We measure reduced polydispersity and qualitatively different
local size ordering in the crystal relative to the fluid, proposing that the
required fractionation is dynamically facilitated by the gas layer. Our results
show that polydispersity and metastability, both ubiquitous in soft matter,
must be considered in tandem if their dynamical effects are to be understood.Comment: Published in Soft Matter. DOI: 10.1039/C3SM27627
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