Trichogramma como alternativa de controle de Heliothis virescens.

bitstream/item/66255/1/31489.pd

Efeitos das Condições de Contorno de Neumann na Eletrodinâmica Escalar

Nós consideramos os efeitos das condições de contorno de Neumann homogêneas na eletrodinâmica escalar com auto-interação. Nós encontramos que se o comprimento da dimensão finita é pequeno o bastante o campo escalar desenvolve massa, ainda que a quebra de simetria espontânea não seja induzida. Como um resultado o campo vetorial não desenvolve masa. Como um subproduto nós também obtemos a energia de Casimir. Nós mostramos também que os resultados (a massa do campo escalar e a densidade de energia do vácuo) são invariante de gauge

Ultrasound-assisted extraction of olive oil: A preliminary economic analysis

The objective of this work was to perform a preliminary economic analysis of the ultrasound-assisted extraction process of olive oil and compare it with the manufacturing costs of the conventional extraction process. The DWSIM software was used for economic modeling considering data found in the literature; the five cost parameters were considered. The results showed a cost of USD 126.50/kg of olive oil in the proposed process. Although expensive, about 54,350 bottles more of oil could be produced due to the higher yield that can be obtained. In parallel, about USD 11,350,000.00 could be earned in one year of operation. In this sense, more research must be done to demonstrate the economic viability of this type of industry, to improve the operations and the costs of manufacturing until the process becomes profitable

Characteristic Energy of the Coulomb Interactions and the Pileup of States

Tunneling data on $\mathrm{La_{1.28}Sr_{1.72}Mn_2O_7}$ crystals confirm Coulomb interaction effects through the $\sqrt{\mathrm{E}}$ dependence of the density of states. Importantly, the data and analysis at high energy, E, show a pileup of states: most of the states removed from near the Fermi level are found between ~40 and 130 meV, from which we infer the possibility of universal behavior. The agreement of our tunneling data with recent photoemission results further confirms our analysis.Comment: 4 pages, 4 figures, submitted to PR

Tratamento de sementes de arroz.

bitstream/item/79570/1/comunicado-272.pd

A Counterexample to Claimed COBE Constraints on Compact Toroidal Universe Models

It has been suggested that if the Universe satisfies a flat, multiply connected, perturbed Friedmann-Lema^itre model, then cosmic microwave background data from the COBE satellite implies that the minimum size of the injectivity diameter (shortest closed spatial geodesic) must be larger than about two fifths of the horizon diameter. To show that this claim is misleading, a simple $T^2 \times R$ universe model of injectivity diameter a quarter of this size, i.e. a tenth of the horizon diameter, is shown to be consistent with COBE four year observational maps of the cosmic microwave background. This is done using the identified circles principle.Comment: 11 pages, 3 figures, accepted for Classical & Quantum Gravit

Ocorrência de Campylobacter jejuni em crianças com diarréia e normais em São Paulo, Brasil

Campylobacter jejuni was looked for in the feaces of 262 children, beeing 189 with acute diarrhoea, 31 with chronic diarrhoea and 42 controls. The organism was isolated from 14 (7.4%), 2 (6.5%) and 6 (14.3%) of the children, and each group, respectively.Campylobacter jejuni foi pesquisado nas fezes de 262 crianças, sendo 189 com diarréia aguda, 31 com diarréia crônica e 42 sem sintomatologia gastrintestinal. A bactéria foi encontrada em 14 (7,4%), 2 (6,5%) e 6 (14,3%) das crianças, em cada um dos grupos, respectivamente

Soft diffraction within the QCD color dipole picture

In this work we consider the QCD parton saturation models to describe soft interactions at the high energy limit. The total and elastic cross sections as well as the elastic slope parameter are obtained for proton-proton and pion-proton collisions and compared to recent experimental results. The analyses are done within the color dipole formalism taking into account saturation models which have been tested against DIS data. The main point is that the match between soft and hard interaction occurs in the saturation region which can be described by high density QCD approaches. Discussion is performed on the main theoretical uncertainties associated with calculations.Comment: 12 pages, 6 figures. Final version to be published in Physical Review