1,334 research outputs found
Universal Properties in Low Dimensional Fermionic Systems and Bosonization
We analyze the universal transport behavior in 1D and 2D fermionic systems by
following the unified framework provided by bosonization. The role played by
the adiabatic transition between interacting and noninteracting regions is
emphasized.Comment: 2 pages, RevTex, contribution for the Proceedings of the XVIII Autumn
School `Topology of Strongly Correlated Systems', Lisbon, Portugal, October,
200
Relationship between fish size and otolith length for 63 species of fishes from the Eastern North Pacific Ocean
Otoliths commonly are used to determine the taxon, age, and size of fishes. This information is useful for population management, predator-prey studies, and archaeological research. The relationship between the length of a fish and the length of its otoliths remains unknown for many species of marine fishes in the Pacific Ocean. Therefore, the relationships between fish length and fish weight, and between otolith length and fish length, were developed for 63 species of fishes caught in the eastern North Pacific Ocean. We also summarized similar relationships for 46 eastern North Pacific fish species reported in the literature. The relationship between fish length and otolith length was linear, and most of the variability was explained by a simple least-squares regression (r 2 > 0.700 for 45 of 63 species). The relationship between otolith length and fish length was not significantly different between left and right otoliths for all but one fish species. Images of otoliths from 77 taxa are included to assist in the identification of species. (PDF file contains 38 pages.
The Third United Nations Conference on the Law of the Sea: the 1975 Geneva Session
The second substantive session of the Third United Nations Conference on the Law of the Sea was held at Geneva from March 26 to May 10, 1975. It was decided at the outset that this would be a negotiating session. There was no general debate. Few formal meetings were held. Even informal working groups of the whole tended to rely on smaller groups the work of which was necessarily removed from public view. Progress, in many respects substantial progress, was made toward producing generally acceptable texts in this way. However, the Conference did not complete the negotiation of a new Law of the Sea Convention or approved texts.</jats:p
Improving the use of research evidence in guideline development: introduction
In 2005 the World Health Organisation (WHO) asked its Advisory Committee on Health Research (ACHR) for advice on ways in which WHO can improve the use of research evidence in the development of recommendations, including guidelines and policies. The ACHR established the Subcommittee on the Use of Research Evidence (SURE) to collect background documentation and consult widely among WHO staff, international experts and end users of WHO recommendations to inform its advice to WHO. We have prepared a series of reviews of methods that are used in the development of guidelines as part of this background documentation. We describe here the background and methods of these reviews, which are being published in Health Research Policy and Systems together with this introduction
Attractive Casimir effect in an infrared modified gluon bag model
In this work, we are motivated by previous attempts to derive the vacuum
contribution to the bag energy in terms of familiar Casimir energy calculations
for spherical geometries. A simple infrared modified model is introduced which
allows studying the effects of the analytic structure as well as the geometry
in a clear manner. In this context, we show that if a class of infrared
vanishing effective gluon propagators is considered, then the renormalized
vacuum energy for a spherical bag is attractive, as required by the bag model
to adjust hadron spectroscopy.Comment: 7 pages. 1 figure. Accepted for publication in Physical Review D.
Revised version with improved analysis and presentation, references adde
The infrared Yang-Mills wave functional due to percolating center vortices
Inspired by the center-vortex dominance in the infrared sector of
Yang-Mills theory observed on the lattice, we propose a vacuum wave functional
localized on an ensemble of correlated center vortices endowed with stiffness
and magnetic monopoles that change the orientation of the vortex flux. In the
electric-field representation, this wave functional becomes an effective
partition function for N complex scalar fields. The inclusion of both oriented
and non-oriented vortices as well as so-called N-vortex matchings leads to an
effective potential that has only a center symmetry left. In the center-vortex
condensed phase, this symmetry is spontaneously broken. In this case, the
Wilson loop average can be approximated by a solitonic saddle-point localized
around the minimal surface. The asymptotic string tension thus obtained
displays Casimir scaling
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