Mostrando recursos 1 - 20 de 293

  1. Acoustic Channel Frequency Response Estimation Using Sources of Opportunity

    Santos, Ana Bela; Felisberto, P.; Jesus, S. M.
    This work addresses the usage of ship radiated noise to estimate the ocean acoustic water propagation channel response between two vertical line arrays. We derive an expression for the frequency response channel estimate using a normal mode development based on cross-correlation methods, in a similar way as Roux et al. [1]. Its applicability and limitations in simulated and real conditions is discussed. Simulations are conducted using the normal mode model KRAKEN, based on the experimental setup and environmental parameters gathered during the RADAR' 07 sea trial, off the west coast of Portugal, in July of 2007. In this sea trial...

  2. An energy-aware resource design model for constrained networks

    Correia, N.; Schutz, G.; Mazayev, A.; Martins, J.; Barradas, Álvaro
    The Internet of Things is expected to incorporate objects and sensor networks of all kinds, and in particular, constrained sensor networks where energy consumption is a critical issue. In order to increase the lifetime of such networks, intelligent and standard-based solutions should be used. Here, we address this challenge through the use of CoRE interfaces for the resource design. These interfaces allow the server side to compose/organize resources and the client side to discover and determine how to consume such resources, besides allowing decisions to be easily integrated into the operation of the network. An energy-aware resource design model is...

  3. Soil erosion, Serra de Grandola (Portugal)

    Fernandez, Helena; Martins, Fernando; Isidoro, Jorge; Zavala, Lorena; Jordan, Antonio
    Soil erosion has long been the subject of attention for environmental management researchers because it implies the loss of a key natural resource for sustaining life. Several methodologies for soil erosion assessment have been developed; many of these are supported by Geographic Information Systems. This study aims to classify the susceptibility of rainfall-induced erosion at the Serra de Grandola (Portugal), based on the Priority Actions Programme/Regional Activity Centre guidelines for mapping soil erosion on the Mediterranean coast. Results show a low-to-moderate susceptibility to rainfall-induced erosion in the lowlands, becoming moderate to high in the highlands of the Serra de Grandola.

  4. Classification of landforms in Southern Portugal (Ria Formosa Basin)

    Martins, Fernando; Fernandez, Helena; Isidoro, Jorge; Jordan, Antonio; Zavala, Lorena
    A Geographic Information Systems-based tool is used for macro-landform classification following the Hammond procedure, based upon a Digital Terrain Model (DTM) created from ordinary Kriging. Gentle slopes, surface curvature, highlands and lowlands areas are derived from the DTM. Combining this information allows the classification of terrain units (landforms). The procedure is applied to the Ria Formosa basin (Southern Portugal), with five different terrain types classified (plains, tablelands, plains with hills, open hills and hills).

  5. Almadrava: men and sea. Social relationship in a short-term community

    Batista, Nuno Miguel; Gonçalves, Marta
    Introduction: Description of the relationship men/sea, on a specific social and life context, in a fishing community temporarily settled in Faro beach, during the tuna fishing period. It was discovered that such a fishing community existed for long decades in this place, where almost 200 families lived only during tuna’s fishing season. This community only had limited and rudimentary resources, based exclusively on human strength. Nevertheless, they developed their own rituals, beliefs and way of living. Now everything is almost extinct. Objective: Report the specificities of the spatial organization and socio-economic relations of this Armação, encouraging the generational continuity, the awareness of this disappeared heritage, its...

  6. Renewing terraces and drystone walls of Algarvian Barrocal. Cultural and touristic values

    Gonçalves, Marta; Prates, Gonçalo Nuno Delgado; Rosendahl, Stefan
    This paper aims to enhance the functions of terraces and drystone walls as structural elements and distinctive factors of the traditional rural zone known as the barrocal of the Algarve, south of Portugal. In fact, such elements define the character of the landscape that forms the background of a traditional touristic region along the coast. The core of this paper will be the knowledge of construc-tion processes, spatial distribution, and hydrological, ecological, economic and social functions, once it is quite necessary for the Algarve region. Some projects and studies have been developed in the Mediterranean context, but there is not...

  7. Ritual of blessing the tuna fishing nets in Algarve (Portugal), between the 30's and 60's

    Batista, Nuno; Gonçalves, Marta
    This paper describes the religious blessing procedure of tuna fishing nets before being launched into the sea, in Algarve, between the decades 30 and 60, when it abruptly ended. The authors describe how blessing of tuna fishing nets was made, based on interviews with peo-ple involved in this art, using photos provided by those, complemented by documentary analysis and bibliographic research. In the course of the work it was discovered that such religious prac-tice took place in Faro beach, in Algarve, for long decades, involving almost 200 families that lived there temporarily for 4 months per year, each year. The...

  8. Atributos de paragens de autocarro acessíveis

    Rosa, Maria Manuela Pires; Landim, Isabel
    O turismo acessível atende ao desenvolvimento de atividades turísticas por todas as pessoas, e considera as necessidades das que têm mobilidade reduzida. Acontece que no ambiente urbano e turístico há um conjunto de barreiras físicas que dificultam a mobilidade dos turistas com trolleys, dos pais com carrinhos de bebé e das pessoas com deficiência. Neste contexto, surgiu o conceito de “design universal” que assegura os direitos de acessibilidade a todos, incluindo as pessoas com necessidades especiais. De acordo com o Conceito Europeu de Acessibilidade "a acessibilidade é a característica de um meio físico ou de um objeto que permite a...

  9. Atributos de paragens de autocarro acessíveis

    Rosa, Maria Manuela Pires; Landim, Isabel
    O turismo acessível atende ao desenvolvimento de atividades turísticas por todas as pessoas, e considera as necessidades das que têm mobilidade reduzida. Acontece que no ambiente urbano e turístico há um conjunto de barreiras físicas que dificultam a mobilidade dos turistas com trolleys, dos pais com carrinhos de bebé e das pessoas com deficiência. Neste contexto, surgiu o conceito de “design universal” que assegura os direitos de acessibilidade a todos, incluindo as pessoas com necessidades especiais. De acordo com o Conceito Europeu de Acessibilidade "a acessibilidade é a característica de um meio físico ou de um objeto que permite a...

  10. Proposta metodológica para avaliação da acessibilidade universal em percursos pedonais: o caso do centro histórico de Faro

    Rosa, Maria Manuela Pires; Landim, Isabel; Loureiro, Nuno de Santos
    Num contexto de turismo acessível é necessária a existência de redes pedonais que detenham um conjunto de atributos de qualidade que garantam usabilidade por todos os cidadãos. Garantir um meio físico acessível é considerado um critério de qualidade, que torna as deslocações pedonais mais agradáveis, não só para idosos e pessoas com deficiência, mas para toda a população residente e turistas. No estudo de caso averigua-se se as características físicas das infraestruturas pedonais, de interesse cultural, localizadas no Centro Histórico de Faro, respeitam as exigências do Regime Jurídico Nacional da Acessibilidade. Formula-se uma metodologia de avaliação da acessibilidade universal das...

  11. Proposta metodológica para avaliação da acessibilidade universal em percursos pedonais: o caso do centro histórico de Faro

    Rosa, Maria Manuela Pires; Landim, Isabel; Loureiro, Nuno de Santos
    Num contexto de turismo acessível é necessária a existência de redes pedonais que detenham um conjunto de atributos de qualidade que garantam usabilidade por todos os cidadãos. Garantir um meio físico acessível é considerado um critério de qualidade, que torna as deslocações pedonais mais agradáveis, não só para idosos e pessoas com deficiência, mas para toda a população residente e turistas. No estudo de caso averigua-se se as características físicas das infraestruturas pedonais, de interesse cultural, localizadas no Centro Histórico de Faro, respeitam as exigências do Regime Jurídico Nacional da Acessibilidade. Formula-se uma metodologia de avaliação da acessibilidade universal das...

  12. Optimization of processing conditions of traditional cured tuna Loins–Muxama

    Esteves, Ezequiel; Aníbal, J.
    Muxama is a traditional highly-valued food product prepared from dry-cured tuna loins in southern Portugal and Spain. The production procedure has seen little change over the last centuries. The muxama’s stability is due to reduced water activity. In addition, the drying method has secondary effects on characteristics of flavor, color, and the nutritional value of the product. Our objectives were to describe the dynamics of important physicochemical parameters such as moisture content, water activity (aW), NaCl concentration (as water–phase salt, ZNaCl), pH and color, during the salting and drying stages of muxama production, and to test the effect(s) of changes...

  13. Cultural accessible tourism in Algarve region, case of study

    Rodrigues, Ana; Rosa, Maria Manuela Pires; Rebelo, Efigénio
    This article analyse the new trends in cultural tourism, namely at the Portuguese Algarve region. Algarve is internationally known as a “Sun & Beach” destination. However, the new trends in Algarve tourism are associated with segments linked to unique and local aspects, such as: the landscape, the gastronomy, the rural and the urban heritage. Actually, the local culture consists an important variable to improve satisfaction and to create experiences for the Algarve visitors. The accessible tourism is a segment referenced in the Algarve tourism strategy. The project “Accessible beaches/beaches for all”, the “Requalification Plan of Vilamoura Downtown Resort” and the...

  14. Cultural accessible tourism in Algarve region, case of study

    Rodrigues, Ana; Rosa, Maria Manuela Pires; Rebelo, Efigénio
    This article analyse the new trends in cultural tourism, namely at the Portuguese Algarve region. Algarve is internationally known as a “Sun & Beach” destination. However, the new trends in Algarve tourism are associated with segments linked to unique and local aspects, such as: the landscape, the gastronomy, the rural and the urban heritage. Actually, the local culture consists an important variable to improve satisfaction and to create experiences for the Algarve visitors. The accessible tourism is a segment referenced in the Algarve tourism strategy. The project “Accessible beaches/beaches for all”, the “Requalification Plan of Vilamoura Downtown Resort” and the...

  15. Ambiente construído e mobilidade em cidades de média dimensão

    Vale, David Sousa; Alves, Rui; Bento, Ricardo Jorge e Silva; Rosa, Maria Manuela Pires; Pereira, Mauro F.
    A relação entre as características do ambiente construído e a mobilidade dos habitantes tem sido amplamente estudada. No entanto, a maioria desta investigação tem-se debruçado sobre contextos metropolitanos, e pouco se sabe sobre esta relação nas cidades de média dimensão, as quais possuem características de mobilidade muito próprias. Por um lado, a sua dimensão reduzida permite que grande parte das deslocações possa ser realizada a pé, mas por outro, o reduzido nível de tráfego e a fraca oferta de transportes públicos promovem as deslocações em veículo individual. Este artigo foca-se na relação entre características do ambiente construído e a mobilidade...

  16. Ambiente construído e mobilidade em cidades de média dimensão

    Vale, David Sousa; Alves, Rui; Bento, Ricardo Jorge e Silva; Rosa, Maria Manuela Pires; Pereira, Mauro F.
    A relação entre as características do ambiente construído e a mobilidade dos habitantes tem sido amplamente estudada. No entanto, a maioria desta investigação tem-se debruçado sobre contextos metropolitanos, e pouco se sabe sobre esta relação nas cidades de média dimensão, as quais possuem características de mobilidade muito próprias. Por um lado, a sua dimensão reduzida permite que grande parte das deslocações possa ser realizada a pé, mas por outro, o reduzido nível de tráfego e a fraca oferta de transportes públicos promovem as deslocações em veículo individual. Este artigo foca-se na relação entre características do ambiente construído e a mobilidade...

  17. Numerical comparative analysis of second order effects of recycled aggregate concrete columns

    Estêvão, João Manuel Carvalho; Barreto, Vítor
    The use of recycled aggregate concrete (from construction and demolition wastes) in buildings has the advantage of being more environmentally-friendly. However, this type of concrete has lower mechanical performance, namely in terms of modulus of elasticity. This lower value has influence on columns second order effects. For this reason, a numerical sensitivity analysis was carried out to study the influence of second order effects on safety of recycled aggregate concrete columns. Two different Eurocode 2 methods were used for this comparison: a method based on nominal curvature and a method based on nominal stiffness. The results were obtained for different...

  18. Numerical comparative analysis of second order effects of recycled aggregate concrete columns

    Estêvão, João Manuel Carvalho; Barreto, Vítor
    The use of recycled aggregate concrete (from construction and demolition wastes) in buildings has the advantage of being more environmentally-friendly. However, this type of concrete has lower mechanical performance, namely in terms of modulus of elasticity. This lower value has influence on columns second order effects. For this reason, a numerical sensitivity analysis was carried out to study the influence of second order effects on safety of recycled aggregate concrete columns. Two different Eurocode 2 methods were used for this comparison: a method based on nominal curvature and a method based on nominal stiffness. The results were obtained for different...

  19. Mathematical modeling of gallic acid release from chitosan films with grape seed extract and carvacrol

    Rubilar, Javiera F.; Cruz, R. M. S.; Zuñiga, Rommy N.; Khmelinskii, Igor; Vieira, M. M. C.
    Controlled release of antimicrobial and antioxidant compounds from packaging films is of utmost importance for extending the shelf-life of perishable foods. This study focused on the mathematical modeling of gallic acid release into an aqueous medium from three chitosan films, formulated with grape seed extract (GSE) and carvacrol. We quantified the release by HPLC technique during 30days at three temperatures (5, 25 and 45°C). The diffusion coefficients, varying with temperature according to an Arrhenius-type relationship, and the respective activation energies for Film-1 and Film-2 were, respectively [Formula: see text] m2s-1 and [Formula: see text] m2s-1, Ea1=58kJmol-1 and Ea2=60kJmol-1 as obtained...

  20. Modeling the kinetics of peroxidase inactivation, colour and texture changes of Portuguese cabbage (Brassica oleracea L. var. costata DC) during UV-C light and heat blanching

    Cruz, R. M. S.; Godinho, Ana; Aslan, Dilek; Koçab, Necip; Vieira, M. M. C.
    The e ects of heat blanching and UV-C light followed by heat on Portuguese cabbage peroxidase (POD), colour and texture were studied in the temperature range of 80-95 °C. POD inactivation, lightness (L) and yellowness (b) colour changes were described by a rst-order reaction model. The greenness (a) colour and texture ( rmness) changes followed a two fraction kinetic model behaviour. The temperature e ect was well described by the Arrhenius law. At lower temperatures the combined treatment showed higher POD inactivation. Colour and texture parameters did not show signi cant di erences between treatments. Long processing times turned the leaves slightly darker, decreased greenness, yellowness...

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