8,273 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
Realistic Chemotherapeutic policies for Tuberculosis in India
A series of controlled studies carried out at the Tuberculosis Chemotherapy Centre have revealed that ambulatory chemotherapy for tuberculosis based on a well-organized clinic service for a
year, is virtually as effective as sanatorium treatment for the same
period, not only in the immediate therapeutic response in terms of
overall radiographic improvement, cavity closure and sputum conversion
(Tuberculosis Chemotherapy Centre, Madras, 1959) but also
in the likelihood of relapse in a subsequent 4-year period of follow-up
(Dawson et al, 1966). Further, principally owing to the rapid sputum
conversion of patients receiving effective chemotherapy there was no
increased risk of contracting the disease to close family contacts of
the patients treated at home, the main risk to them being before
treatment had begun (Andrews et al, 1960; Kamat et al, 1966).
These studies also clearly showed that the traditionally held virtues
of sanatorium treatment namely, prolonged bed-rest, good diet, good
airy accommodation, nursing and isolation were remarkably unimportant
provided adequate chemotherapy was administered. There
have been 5 other controlled trials based on random allocation .
reported in the world medical literature which compared either sanatorium
treatment with clinic treatment (Tyrell, 1956 ; Bell, 1960) or
rest with ambulation (Kay, 1957 ; Tuberculosis Society of Scotland,
1960; Wier et al, 1957 ; Wynn-Williams and Shaw, 1960) and not one
demonstrated any advantage either of sanatorium treatment over
clinic treatment or of rest over ambulation. Because of these
findings and because of the gross shortage of hospital beds for tuberculosis,
ambulatory chemotherapy for the major or the entire period
of treatment has become the accepted practice in the tuberculosis
control programmes in India as well as in many other developing
countries of the world
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
Deep Sea and Oceanic Resources
Although the marine living resources are renewable, their
unbridled exploitation causes irreparable loss to the habitat
and the sustainable production of biota. Ever increasing
population and demand for cheap fish protein together with
the availability of a 8041 km long coast and more than 1,80,000
km2 shallow coastal area have attracted not only the
traditional communities but also small-scale entrepreneurs into
fishing. The last fifty years' growth of Indian marine fisheries
is commendable, which has transformed a subsistence-oriented traditional fmheries into a market oriented commercial fisheries with the support of technical advancements in harvest and post harvest areas and also gained considerable strength and capabilities in landing, storage and processing infrastructure. The growing demand for prime value species of marine resources in domestic and export market has encouraged the commercial exploitation and production of target species
through mechaniaation and motorisation
The deep scattering layer (DSL) of Indian EEZ
The deep scattering layer is a trophic network that carry
numerous food chains, some of which end up in species of high
economic value, such as oceanic squids, tunas, other scombroids,
pelagic sharks etc. These diurnally and vertically moving
bioacoustic layers are assemblages of mostly negatively phototropic
zooplankton and micronekton. The paper examines their
characteristics, sampling methods, ecosystem, bio composition and
future lines of research and management priorities and reviews all
works done in India on the DSL. The major database for this study
is drawn from the results of the initial surveys and samplings of
FORV Sagar Sampada in the Indian EEZ since 1985
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