641 research outputs found
Coupled modelling of plant uptake, soil water balance and soil solute transport for estimating the fate of cadmium and lead in amended agrosystems
Economic evaluation of three systems of alimentation used in finishing lambs
Eighteen castrated male lambs of the Texel breed were randomly diestribut3ed among the following treatments: T1 = confinement; T2 = pasture with supplementation; T3 = pasture without supplementation. At 144 days of age the lambs were slaughtered after a 12hr fast. Live weight at slaughter and warm carcass weight were lower (P≤0.05) for T3 lambs compared with those confined or supplemented at pasture, which resulted in lower gross income. Profitability in relation to liveweight was higher (P≤0.05) for the lambs on pasture without supplementation relative to T1, whereas the profitability in relation to carcass weight numerically was higher for both T1 and T2 than for T3. The availability of herbage dry matter at the end of the experiment was 326% higher for the supplementation treatment than without supplementation (T2 vs. T3). (Portuguese
Superfluid fraction in an interacting spatially modulated Bose-Einstein condensate
At zero temperature, a Galilean-invariant Bose fluid is expected to be fully
superfluid. Here we investigate theoretically and experimentally the quenching
of the superfluid density of a dilute Bose-Einstein condensate due to the
breaking of translational (and thus Galilean) invariance by an external 1D
periodic potential. Both Leggett's bound fixed by the knowledge of the total
density and the anisotropy of the sound velocity provide a consistent
determination of the superfluid fraction. The use of a large-period lattice
emphasizes the important role of two-body interactions on superfluidity
Peri-urban Farn ing Systems and Food Processing in the Congo
Abstract AGRICONGO (Institut de recherche et d'appui pour le développement agricole en Zones tropicales) developed a project entitled new farming systems (NSF). This project is intended to implement peri-urban agriculture for city dwellers who want to go into small farm businesses. Because the Congo is importing a large part of its food, the project's first goal was to identify products for development. A basic project assumption was that the best way to reduce these imports was to modernize traditional foods. There was also a need to develop appropriate technologies in agronomy and food science. Work was done to design both a 1.5 ha NFS farm and an integrated food processing facility. Farming techniques were tested at the research station level and the study included socioeconomic issues and farmer-level implementation of product marketing and commercialization. This report presents preliminary findings from 20 pilot NFS farms that were tested near Brazzaville. Food processing lines and their management are also described. Processed products made available to urban markets through the project were chikwangue (cassava bread) and cassava-based mixed flour for infant food
Insight from PREFACE & AWA on Tropical Atlantic Tuna ecology and effects on western African fisheries economies
International audienc
Quantum character varieties and braided module categories
We compute quantum character varieties of arbitrary closed surfaces with
boundaries and marked points. These are categorical invariants of a surface , determined by the choice of a braided tensor category
, and computed via factorization homology.
We identify the algebraic data governing marked points and boundary
components with the notion of a {\em braided module category} for ,
and we describe braided module categories with a generator in terms of certain
explicit algebra homomorphisms called {\em quantum moment maps}. We then show
that the quantum character variety of a decorated surface is obtained from that
of the corresponding punctured surface as a quantum Hamiltonian reduction.
Characters of braided -modules are objects of the torus category
. We initiate a theory of character sheaves for quantum
groups by identifying the torus integral of
with the category of equivariant quantum
-modules. When , we relate the mirabolic version of this
category to the representations of the spherical double affine Hecke algebra
(DAHA) .Comment: 33 pages, 5 figures. Final version, to appear in Sel. Math. New Se
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