Durabilidade natural de madeiras amazônicas em contato com o solo.

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Carotid Artery Dissection

A dissecção da artéria carótida interna é uma causa de AVC isquémico, particularmente em doentes jovens, sem aparentes factores de risco cérebro-vasculares. Métodos: Os autores descrevem o quadro clínico e achados imagiológicos (TAC, RMN e angiografia de subtracção digital) de cinco doentes internados consecutivamente na Unidade Cérebro-Vascular do Hospital de S. José, num período de dois meses, com o diagnóstico de oclusão da artéria carótida interna por provável dissecção. Discussão: O conjunto de casos clínicos apresentados salienta a heterogeneidade de formas de apresentação desta patologia, quer do ponto de vista clínico, quer imagiológico

Saving phase: Injectivity and stability for phase retrieval

Recent advances in convex optimization have led to new strides in the phase retrieval problem over finite-dimensional vector spaces. However, certain fundamental questions remain: What sorts of measurement vectors uniquely determine every signal up to a global phase factor, and how many are needed to do so? Furthermore, which measurement ensembles lend stability? This paper presents several results that address each of these questions. We begin by characterizing injectivity, and we identify that the complement property is indeed a necessary condition in the complex case. We then pose a conjecture that 4M-4 generic measurement vectors are both necessary and sufficient for injectivity in M dimensions, and we prove this conjecture in the special cases where M=2,3. Next, we shift our attention to stability, both in the worst and average cases. Here, we characterize worst-case stability in the real case by introducing a numerical version of the complement property. This new property bears some resemblance to the restricted isometry property of compressed sensing and can be used to derive a sharp lower Lipschitz bound on the intensity measurement mapping. Localized frames are shown to lack this property (suggesting instability), whereas Gaussian random measurements are shown to satisfy this property with high probability. We conclude by presenting results that use a stochastic noise model in both the real and complex cases, and we leverage Cramer-Rao lower bounds to identify stability with stronger versions of the injectivity characterizations.Comment: 22 page

Solar Reector Design

The design of solar panels is investigated. Different aspects of this problem are presented. A formula averaging the solar energy received on a given location is derived rst. The energy received by the collecting solar panel is then calculated using a specially designed algorithm. The geometry of the device collecting the energy may then be optimised using different algorithms. The results show that for a given depth, devices of smaller width are more energy efficient than those of wider dimensions. This leads to a more economically efficient design

Ocorrência e grau de severidade de dano das principais pragas da aceroleira.

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Pragas associadas à aceroleira.

A incidencia de algumas pragas de maior ou menor interesse economica tem sido observada com frequencia em areas irrigadas, destacando-se os pulgoes como a de maior severidade. Esss insetos atacam geralmente a extremidade tenra dos ramos, causando murchamento e morte, o que forca a emitir brotacoes laterais.bitstream/item/33820/1/Ct-038.pd

Levantamento e identificação das principais pragas do sapotizeiro.

Este trabalho objetiva preliminarmente, levantar, identificar e conhecer o grau de severidade de dano, bem como a epoca de ocorrencia das principais pragas e insetos beneficos associados ao sapotizeiro e, a partir dai, tracar estrategias ...bitstream/CNPAT-2010/5384/1/Pa-073.pd

What we learned in kindergarten: five tips for collaboration in oncology

As you read the five tenets presented here, think about these simple truths of leading and influencing others, managing failure, thinking strategically, and resolving conflicts. Ap - ply them to the world in which we all now live and play. Far too often work (the place) is viewed simply as where work (the action) occurs. What we are saying is that, although institutional targets (such as reducing wait times to see new patients) are all laudable goals, there has to be more, and play has to become an essential component of work. What can we uncover, rediscover, and create to make the time spent with one another the best possible experience for everyone involved? Even more importantly, what must we do to ensure that what we create and share has the possibil - ity and potential to make our lives and the world a better place? Play isn’t something we do as a part of life—it is life.info:eu-repo/semantics/publishedVersio

Avaliação de práticas de manejo da cultura do cajueiro comum.

Apesar de se reconhecer que e possivel obter significativos aumentos de producao na cultura, com a aplicacao de fertilizantes, esta e uma pratica muito pouco utilizada pelos produtores. O reduzido numero de resultados experimentais, os custos dos fertilizantes e o elevado numero de plantas improdutivas sao os principais fatores que concorrem para a nao adocao do uso de fertilizantes na cultura.bitstream/CNPAT-2010/1841/1/Pa-008.pd