8,204 research outputs found
Jamming in a lattice model of stochastically interacting agents with a field of view
We study the collective dynamics of a lattice model of stochastically
interacting agents with a weighted field of vision. We assume that agents
preferentially interact with neighbours, depending on their relative location,
through velocity alignments and the additional constraint of exclusion. Unlike
in previous models of flocking, here the stochasticity arises intrinsically
from the interactions between agents, and its strength is dependent on the
local density of agents. We find that this system yields a first-order jamming
transition as a consequence of these interactions, even at a very low density.
Furthermore, the critical jamming density is found to strongly depend on the
nature of the field of view.Comment: 5 pages, 3 figures + 3 pages supplementary materia
Manpower information
A description of the NAL nominal roll database (listing basic
information about NAL employees) created using the Ingres relational database software. Using this database it is possible to provide a wide variety of reports about NAL staff, respond to a wide assortment of queries and undertake
elementary statistical analysis to tabulate (and pictorially depict) the average age of NAL scientists, the future retirement pattern of NAL employees etc
Exact Persistence Exponent for One-dimensional Potts Models with Parallel Dynamics
We obtain \theta_p(q) = 2\theta_s(q) for one-dimensional q-state
ferromagnetic Potts models evolving under parallel dynamics at zero temperature
from an initially disordered state, where \theta_p(q) is the persistence
exponent for parallel dynamics and \theta_s(q) = -{1/8}+
\frac{2}{\pi^2}[cos^{-1}{(2-q)/q\sqrt{2}}]^2 [PRL, {\bf 75}, 751, (1995)], the
persistence exponent under serial dynamics. This result is a consequence of an
exact, albeit non-trivial, mapping of the evolution of configurations of Potts
spins under parallel dynamics to the dynamics of two decoupled reaction
diffusion systems.Comment: 13 pages Latex file, 5 postscript figure
Management of Fresh water Fisheries
The book under review 'Management of Fresh Water Fisheries' by Jacques Arrignon
is a very valuable compendium of knowledge on fresh water fisheries presented in three parts, such as ecological fundamentals, fish breeding and management of aquatic media. The contents of the book are a collection appropriate and authentic record of information
which heavily deal with many fundamentals, topics, methodology, breeding and culture practices, management of medium which are relevant, applicable and replicable
to many universal situations
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