Environmental problems and opportunities of the peri-urban interface and their impact upon the poor

The objective of this document is to provide an overview of the problems and opportunities of the peri-urban interface (PUI) with regard to the broad concerns of environmentalsustainability and poverty

Light composite Higgs boson from the normalized Bethe-Salpeter equation

Scalar composite boson masses have been computed in QCD and Technicolor theories with the help of the homogeneous Bethe-Salpeter equation (BSE), resulting in a scalar mass that is twice the dynamically generated fermion or technifermion mass ($m_{dyn}$). We show that in the case of walking (or quasi-conformal) technicolor theories, where the $m_{dyn}$ behavior with the momenta may be quite different from the one predicted by the standard operator product expansion, this result is incomplete and we must consider the effect of the normalization condition of the BSE to determine the scalar masses. We compute the composite Higgs boson mass for several groups with technifermions in the fundamental and higher dimensional representations and comment about the experimental constraints on these theories, which indicate that models based on walking theories with fermions in the fundamental representation may, within the limitations of our approach, have masses quite near the actual direct exclusion limit.Comment: 9 pages, 4 figures, minor corrections, to appear in Physical Review

Parasitóides de moscas-das-frutas no Estado do Amapá, Brasil.

A fruticultura é uma importante atividade econômica para o Brasil. No entanto, há inúmeras pragas que prejudicam a produção de frutas. Dentre essas pragas, destacam-se as moscas-das-frutas ou tefritídeos, que compôem um dos grupos de insetos que mais causam danos à fruticultura mundial. Os parasitóides são os mais efetivos inimigos naturais de moscas-das-frutas, sendo fundamental conhecer as espécies existentes em cada região do país

Populações de plantas e adubação orgânica em solo degradado na cultura do amendoim

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