Mostrando recursos 1 - 20 de 128

  1. Incêndio da Catraia (Tavira). Livro-guia da viagem de estudo. I Seminário da rede incêndios-solo

    Pedras, Celestina; Silva, Elisa; Martins, Fernando; Fernandez, Helena; Lourenço, Luciano; Lança, Rui
    A visita técnica às áreas ardidas no incêndio da Catraia, como ficou conhecido, está integrada no último dia do programa do I SEMINÁRIO DA REDE INCÊNDIOS- -SOLO e I SIMPÓSIO IBERO-AFRO-AMERICANO DE RISCOS, subordinado ao tema “Riscos, Incêndios Florestais e Território”. Esta visita será acompanhada por técnicos da Câmara Municipal de São Brás que irão apresentar os aspetos mais relevantes relativos ao processo de ignição e propagação do incêndio que deflagrou entre 18 e 21 de Julho de 2012, assim como os principais efeitos na área afetada.

  2. URBSIS: avaliação da vulnerabilidade e gestão do risco sísmico à escala urbana

    Costa, Aníbal; Costa, Alexandre A.; Oliveira, Carlos Sousa; Varum, Humberto; Estêvão, João Manuel Carvalho; Vicente, Romeu; Maio, Rui; Ferreira, Tiago Miguel
    A qualidade de vida nos núcleos urbanos constitui uma meta dinâmica, fortemente influenciada pelos processos sociais e económicos, pela evolução das suas exigências e expectativas e pela evolução do próprio tecido urbano, do parque edificado e das infraestruturas. Nos núcleos urbanos antigos, são peças fundamentais deste desafio a garantia do conforto e de salubridade, num equilíbrio que se quer, sustentado e sustentável, com a preservação das memórias e da cultura local. Para além da inadequada resistência à ação sísmica, a grande maioria deste edificado encontra-se em avançado estado de degradação, situação que, aliada a outros fenómenos de índole social, tem...

  3. A computer vision based web application for tracking soccer players

    Rodrigues, J. M. F.; Cardoso, Pedro J. S.; Vilas, Tiago; Silva, Bruno; Rodrigues, Pedro; Belguinha, António; Gomes, Carlos
    Soccer is a sport where everyone that is involved with it make all the efforts aiming for excellence. Not only the players need to show their skills on the pitch but also the coach, and the remaining staff, need to have their own tools so that they can perform at higher levels. Footdata is a project to build a new web application product for soccer (football), which integrates two fundamental components of this sport's world: the social and the professional. While the former is an enhanced social platform for soccer professionals and fans, the later can be considered as a...

  4. Muxma and Estupeta: traditional food products obtained from tuna loins in South Portugal and Spain

    Aníbal, J.; Esteves, E.
    Tuna is a generic name for fi sh from the Scombridae family, which includes about 50 species, mostly from the Thunnus genus. Tuna is a very important commercial resource widely but sparsely distributed throughout the oceans of the world that generally occurs in tropical and temperate waters between about 45° north and south of the equator (FAO 2010 ). Because of high muscular activity, some tuna species display warm-blooded adaptations and can raise their body temperatures above surrounding water temperatures (Randall et al. 2002 ). This enables them to survive in cooler ocean environments and to inhabit a wider geographic range of latitudes than other kinds of fi...

  5. The importance of food processing on Vitamin C: present and future trends

    Cruz, R. M. S.; Vieira, M. M. C.; Silva, C. L. M.
    Consumer demand for safer and nutritious food products has led to development and research of new processing technologies. Throughout the centuries, vitamin C has played an important role in human nutrition due to its antioxidant effect and stimulation of the immunological system. Nevertheless, since the human organism does not produce its own vitamin C, it must be sourced from a regular diet or taken as a vitamin supplement. Besides its natural availability it is possible to find vitamin C in many different forms. The development of new food products formulations including vitamin C and new processing operations in order to...

  6. The effect of ultrasound in food processing

    Cruz, R. M. S.; Vieira, M. M. C.; Silva, C. L. M.
    The development of innovative and more efficient processing operations aiming at less severe heat treatment and higher quality food products are common in food preservation research. These emerging technologies may have an extraordinary significance on the product's final quality, and consequently may bring out new opportunities that fulfill the market requirements. Ultrasound is considered to be an emerging and promising non-thermal food processing technology. In this chapter a review of its applications and effects in food processing will be presented. Despite its original function, in degassing or homogenization of solutions, its use is widely reported in hurdle technologies and combined...

  7. Power transformers' fault diagnostics by Park’s Vector Approach

    Cardoso, A. J. Marques; Oliveira, L. M. R.
    The electricity market was, for a long time, dominated by national or regional monopolies. During the last decades, this picture has changed drastically, particularly in Europe and in the United States. The trend toward free competition and privatization with the related demands on return on investments results in a cost consciousness among utilities. In this context, monitoring and on-site diagnostics are seen as a possible way of optimizing existing assets. The main driving forces are to reduce maintenance costs, to prevent forced outages with the related consequential costs, and to work existing equipment harder and longer [1]. Transformers constitute the largest single component of the transmission...

  8. Power transformers differential protection using the p-q power theory

    Oliveira, L. M. R.; Cardoso, A. J. Marques
    This paper describes the application of the p-q power theory to the differential protection of power transformers. The information provided by the harmonic content of the differential active and reactive power components is used to detect winding insulation failures and to distinguish them from magnetizing inrush current transients. A variety of test cases is presented in the paper, demonstrating the effectiveness of the protection strategy.

  9. Biological models for active vision: towards a unified architecture

    Terzic, Kasim; Lobato, D.; Saleiro, Mário; Martins, Jaime A.; Farrajota, Miguel; Rodrigues, J. M. F.; du Buf, J. M. H.
    Building a general-purpose, real-time active vision system completely based on biological models is a great challenge. We apply a number of biologically plausible algorithms which address different aspects of vision, such as edge and keypoint detection, feature extraction,optical flow and disparity, shape detection, object recognition and scene modelling into a complete system. We present some of the experiments from our ongoing work, where our system leverages a combination of algorithms to solve complex tasks.

  10. Da laranja ao licor

    Galego, Ludovina
    Venha conhecer o processo de fermentação que possibilita a produção de vinhos, aguardentes e licores de laranja. Em modalidade de oficina de ciência aprenda a cristalizar a casca da laranja, a confecionar saladas e sumos de laranja, compotas e gelatinas com cascas da laranja. Oradoras: Prof. Ludovina Rodrigues Galego (ISE) e Eng.ª Conceição Silva (Quinta do Freixo - Benafim) .

  11. Aguardentes de medronho

    Galego, Ludovina
    A aguardente de medronho, muitas vezes designada apenas por medronho, é um destilado que continua a ser produzida, essencialmente de forma artesanal. A sua produção, tudo indica, ter iniciado em Monchique, no século X, pelos Árabes. A qualidade deste destilado passou por fases polémicas, principalmente pela escassez de mão-de-obra. Depois de um período de investigação laboratorial e de trabalho com produtores locais, envolvendo várias Instituições da região, a qualidade da aguardente de medronho foi paulatinamente melhorando. O controlo de qualidade das aguardentes é feito, essencialmente, recorrendo a técnicas cromatografias e espetrofotométricas. Técnicas que permitem diferenciar não só a qualidade, como...

  12. Garum: recovering of the production process of an ancestral condiment

    Vieira, M. M. C.
    The objective of the present work was to study the shelf life of a recipe of a fish sauce Garum originated in the roman empire.

  13. Turbo equalization with cancellation of nonlinear distortion effects for CP-Assisted and Zero-Padded MC-CDMA signals

    Dinis, Rui; Silva, Paulo; Araújo, Teresa
    We consider MC-CDMA schemes, with reduced envelope fluctuations. Both CP-assisted (cyclic prefix) and ZP (zero-padded) MC-CDMA schemes are addressed. We develop turbo FDE (frequency-domain equalization) schemes, combined with cancelation of nonlinear distortion effects. The proposed turbo receivers allow significant performance improvements at low and moderate SNR, even when the transmitted signals have reduced envelope fluctuations.

  14. Frequency- domain multiuser detection for highly overloaded DS-CDMA systems

    Silva, Paulo; Dinis, Rui
    A DS-CDMA (Direct Sequence-Coded Division Multiple Access) system has maximum spectral efficiency if the system is fully loaded (i.e., the number of users is equal to the spreading factor) and we employ signals with bandwidth equal to the chip rate. However, due to implementation constraints we need to employ signals with higher bandwidth, decreasing the system’s spectral efficiency. In this paper we consider prefixassisted DS-CDMA systems with bandwidth that can be significantly above the chip rate. To allow high spectral efficiency we consider highly overloaded systems where the number of users can be twice the spreading factor or even more. To cope with the strong interference levels we present an iterative...

  15. Local object gist: meaningful shapes and spatial layout at a very early stage of visual processing

    Martins, J. C.; Rodrigues, J. M. F.; du Buf, J. M. H.
    In his introduction, Pinna (2010) quoted one of Wertheimer’s observations: “I stand at the window and see a house, trees, sky. Theoretically I might say there were 327 brightnesses and nuances of color. Do I have ‘327’? No. I have sky, house, and trees.” This seems quite remarkable, for Max Wertheimer, together with Kurt Koffka and Wolfgang Koehler, was a pioneer of Gestalt Theory: perceptual organisation was tackled considering grouping rules of line and edge elements in relation to figure-ground segregation, i.e., a meaningful object (the figure) as perceived against a complex background (the ground). At the lowest level –...

  16. Multi-scale cortical keypoints for realtime hand tracking and gesture recognition

    Farrajota, Miguel; Saleiro, Mário; Tersic, K.; Rodrigues, J. M. F.; du Buf, J. M. H.
    Human-robot interaction is an interdisciplinary research area which aims at integrating human factors, cognitive psychology and robot technology. The ultimate goal is the development of social robots. These robots are expected to work in human environments, and to understand behavior of persons through gestures and body movements. In this paper we present a biological and realtime framework for detecting and tracking hands. This framework is based on keypoints extracted from cortical V1 end-stopped cells. Detected keypoints and the cells’ responses are used to classify the junction type. By combining annotated keypoints in a hierarchical, multi-scale tree structure, moving and deformable hands can be segregated, their movements can be obtained, and they can...

  17. Aplicação de realidade aumentada para o ensino de sólidos geométricos

    Leitão, R.; Brito, Ana; Rodrigues, J. M. F.
    Soluções de realidade virtual e aumentada têm vindo a ser utilizadas no segmento de ensino explorando diferentes modalidades de interação de forma a proporcionar ao aluno acesso efetivo de informação em situações de experiências imersivas em tempo real. Na internet podemos encontrar variadíssimas aplicações educacionais, que nos ajudam a todos, desde as crianças em idade escolar até a profissionais de todas as áreas, proporcionando o estudo mais interativo, divertido e mais envolvente. Neste artigo, onde assumimos que o contexto de ensino é propício para a experimentação de novos modelos de ensino/aprendizagem, apresentamos uma aplicação educacional na área da geometria com o objetivo de potencializar a transferência de conhecimento, salientando as características dimensionais dos sólidos.

  18. Disparity energy model with keypoint disparity validation

    Farrajota, Miguel; Martins, J. C.; Rodrigues, J. M. F.; du Buf, J. M. H.
    A biological disparity energy model can estimate local depth information by using a population of V1 complex cells. Instead of applying an analytical model which explicitly involves cell parameters like spatial frequency, orientation, binocular phase and position difference, we developed a model which only involves the cells’ responses, such that disparity can be extracted from a population code, using only a set of previously trained cells with random-dot stereograms of uniform disparity. Despite good results in smooth regions, the model needs complementary processing, notably at depth transitions. We therefore introduce a new model to extract disparity at keypoints such as edge junctions, line endings and points with large curvature. Responses...

  19. Cortical 3D face and object recognition using 2D projections

    Rodrigues, J. M. F.; Lam, Roberto Célio Lau; du Buf, J. M. H.
    Empirical studies concerning face recognition suggest that faces may be stored in memory by a few canonical representations. In cortical area V1 exist double-opponent colour blobs, also simple, complex and end-stopped cells which provide input for a multiscale line/edge representation, keypoints for dynamic feature routine, and saliency maps for Focus-of-Attention.

  20. Image morphology: from perception to rendering

    Rodrigues, J. M. F.; du Buf, J. M. H.
    Complete image ontology can be obtained by formalising a top-down meta-language wich must address all possibilities, from global message and composition to objects and local surface properties.

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