Integração de gráficos vectoriais e informação estruturada em ambientes distribuídos

Dissertação de Mestrado em Ciência de Computadores apresentada à Faculdade de Ciências da Universidade do Port

Durability of CFRP-concrete bond in EBR and NSM systems under natural ageing for a period of three years

This work aims at assessing the durability of the CFRP-concrete bond exposed to different outdoor ageing environments for a period of three years.Carbon Fibre Reinforced Polymer (CFRP) composites have been shown to possess desirable properties for strengthening of reinforced concrete (RC) structures. The application of CFRP composites is mainly through Externally Bonded Reinforcement (EBR) or Near Surface-Mounted (NSM) techniques. The main objective of the present work was to provide insights on durability of bond between concrete and CFRP strips installed according to EBR and NSM techniques under the effects of ageing induced by outdoor conditions for a period of three years. Specimens were placed in four different outdoor environments (E3-E6) with ageing mainly induced by freeze-thaw attacks, carbonation, airborne chlorides, and elevated temperatures. Besides, the study included a reference environment (E1: ≈20 C / 55% RH) and another environment (E2: ≈20 C / water immersion). The bond test results for the specimens collected from the aforementioned outdoor environments showed a low degradation of the CFRP-concrete bond after three years.This work was carried out in scope of the project FRPLongDur POCI-01-0145-FEDER-016900 (FCT PTDC/ECM-EST/1282/2014) and Durable-FRP (PTDC/ECI-EGC/4609/2020) funded by national funds through the Foundation for Science and Technology (FCT) and co-financed by the European Fund of the Regional Development (FEDER) through the Operational Program for Competitiveness and Internationalization (POCI) and the Lisbon Regional Operational Program. This work was partly financed by FCT / MCTES through national funds (PIDDAC) under the R&D Unit Institute for Sustainability and Innovation in Structural Engineering (ISISE), under reference UIDB/04029/2020. This work is financed by national funds through FCT under grant agreement [DFA/BD/08403/2021] attributed to the first author

Durability of bond of EBR CFRP laminates to concrete under real-time field exposure and laboratory accelerated ageing

The durability of bond between carbon fibre-reinforced polymer (CFRP) laminates and concrete with the externally bonded reinforcement (EBR) technique was investigated under real-time field exposure (RTFE) and accelerated ageing. The experimental program, over two years, includes four outdoor environments inducing carbonation, freeze–thaw attack, extreme temperatures, and airborne chlorides from the ocean. A laboratory environment (20 ◦C/55% RH) was used as reference environment. Additionally, a water-immersion environment (20 ◦C) was also considered. Relatively low values of bond degradation were observed, where the maximum pullout force varied between − 4 % and +16 % under RTFE, while on water–immersed specimens, the maximum pullout force decreased by ~8 %.This work was carried out in the scope of the project FRPLongDur POCI-01-0145-FEDER-016900 (FCT PTDC/ECM-EST/1282/2014) and DURABLE-FRP (PTDC/ECI-EGC/4609/2020) funded by national funds through the Foundation for Science and Technology (FCT) and co-financed by the European Fund of the Regional Development (FEDER) through the Operational Program for Competitiveness and Internationalization (POCI) and the Lisbon Regional Operational Program and, was partly financed by FCT/MCTES through national funds (PIDDAC) under the R&D Unit Institute for Sustainability and Innovation in Structural Engineering (ISISE), under reference UIDB/04029/2020, and under the Associate Laboratory Advanced Production and Intelligent Systems ARISE under reference LA/P/0112/2020. The first author wishes also to acknowledge the grant SFRH/BD/131259/2017 provided by Fundação para a Ciência e a Tecnologia (FCT)

Bond durability of concrete-cfrp ebr and nsm systems under natural ageing

The use of Carbon Fibre Reinforced Polymer (CFRP) as reinforcement material for strengthening of existing reinforced concrete (RC) structures has been increasing. These materials can be applied mainly by using two strengthening techniques: (i) the Externally Bonded Reinforcement (EBR) by the application of the CFRP on the concrete surface; and, (ii) the Near Surface Mounted (NSM) by the insertion of the CFRP into the grooves on the concrete cover of the RC element to be strengthened. The durability of structures strengthened with CFRP materials is still an open issue. Accelerated ageing protocols under laboratory conditions have been used for the assessment of the durability; however, very few studies have been performed in outdoor environments (natural ageing). Moreover, the relationship between accelerated ageing and real outdoor ageing is not fully understood. The main objective of this paper is to give new insights on the bond durability between concrete and CFRP strips installed according to both EBR and NSM techniques, after a 2-year exposure to natural outdoor conditions. This study includes a reference environment (~20 C / 55% RH) for comparing proposes and four outdoor environments for ageing induced mainly promoting (i) carbonation, (ii) freeze-thaw attack, (iii) elevated temperatures, and (iv) airborne chlorides from seawater. An additional environmental condition, namely continuous immersion in water at ~20 C was also considered. The performance of the bond concrete-adhesive-CFRP was assessed throughout pull-out tests. When compared with the reference environment, small degradation on the bond performance on specimens exposed to outdoor environments has been observed for both strengthening techniques.- (undefined

Um Portugal de imigrantes: exercício de reflexão sobre a diversidade cultural e as políticas de integração

Apesar da pluriculturalidade que caracteriza algumas regiões de Portugal, existe um desconhecimento e por vezes resistência, em particular das comunidades mais tradicionais e das gerações mais antigas, na aceitação dos imigrantes que escolhem o nosso País como destino de acolhimento. Conhecer as comunidades imigrantes pode ajudar a perceber e a minimizar as dificuldades do convívio pluricultural. Este será, na atualidade, um dos papéis que o animador sociocultural será chamado a desempenhar. Para isso, é necessário que reconheça os recursos legais, metodológicos e teóricos que tem ao seu dispor, sendo estas as premissas que norteiam o presente exercício. Esta análise nasceu de uma proposta de trabalho da Unidade Curricular de Multiculturalidade e Cidadania, mas rapidamente se revelou um importante contributo para o conhecimento da diversidade cultural no nosso país. Após uma contextualização teórica relativa aos principais fluxos migratórios em Portugal, é apresentada a análise dos dados relativos à composição das origens dos imigrantes em Portugal na atualidade e a sua distribuição pelo território português. Este é o ponto de partidapara a reflexão que se lhe seguiu, que visa, por um lado, identificar algumas das problemáticas que resultam dos contextos de diversidade cultural e, por outro, conhecer as propostas do Estado para promover a integração do “outro”. Estes pilares sustentaram a abordagem final relativa ao papel da Animação Sociocultural (ASC) e do animador neste contexto.Abstract Portugal has been a pluricultural country since early times. Notwithstanding, Portuguese society is mostly unaware of this fact and is not always open to cultural diversity. Social and cultural workers may have an important role managing inter cultural conflicts. In order to do so, these professionals need to acknowledge the importance of theoretical social principles and scientific research to effectively intervene in multicultural contexts. These arguments support the present exercise, developed during Multiculturalism and Citizenship classes (lectured at Escola Superior de Educação de Lisboa – Instituto Politécnico de Lisboa, 2012- 2013). We present a brief analysis regarding migration patterns to Portugal followed by a data analysis concerning their geographical origin and distribution in Portuguese territory. An overview on the problems regarding cultural diversity and foreigner acceptance is also presented. Finally, we debate on the role played by the social and cultural worker in today‟s globalized and diverse societyRésumé La pluriculturalité qui caractérise certaines régions du Portugal n‟est pas reconnue par tous les citoyens et est, parfois, associée à une certaine résistance quant à l‟acceptation des immigrants qui choisissent notre pays comme destination d‟accueil. L‟animateur socioculturel peut avoir un rôle prépondérant dans la gestion de la diversité culturelle. C‟est pourquoi, il est important qu‟il soit conscient, tout d‟abord, du besoin d‟investir dans la formation et la recherche théoriquement fondée portant sur la réalité qui l‟entoure et où il pourra être amené à travailler et ensuite, qu‟il connaisse les caractéristiques de la société moderne et globale dans laquelle il vit. Ce sont les deux prémisses qui orientent le présent exercice qui est issu d‟une proposition de travail de l‟Unité Curriculaire de Multiculturalité et Citoyenneté mais qui rapidement, s‟est révélé un apport considérable pour la connaissance de la diversité culturelle. Après une contextualisation théorique relative aux principaux flux migratoires au Portugal, sont présentées et analysées des données relatives à la composition des origines des immigrants au Portugal actuellement et leur distribution sur le territoire portugais. C‟est le point de départ pour la réflexion qui s‟en est suivie. La réflexion prétend d‟une part, identifier certaines des problématiques qui proviennent des contextes de diversité culturelle et d‟autre part, connaître les propositions de l‟Etat pour promouvoir l‟intégration de « l‟autre » qui peut être, plus ou moins, en marge de la société portugaise. Ces piliers soutiennent l‟abordage final relatif au rôle de l‟animateur socioculturel dans ces contextes pluriculturels

Seminário de conclusão do projeto FRPLongDur

The FRPLongDur research project (reference no. POCI-01-0145-FEDER-016900) was financed by national funds through FCT and co-financed by the European Regional Development Fund (FEDER) through the Competitiveness and Internationalization Operational Program (POCI), and Lisbon Regional Operational Program. This project had as participating institutions at the University of Minho and the National Civil Engineering Laboratory. It also had the participation of Empa - Swiss Federal Laboratories for Materials Science and Technology. FRPLongDur aimed at contributing to the knowledge on the long-term behavior and durability of reinforced concrete elements strengthened with CFRP (Carbon Fiber Reinforced Polymers) laminates according to the EBR (Externally Bonded Reinforcement) and NSM (Near Surface Mounted) reinforcement techniques, under the effect of aging in real environments. The work involved: (i) an extended experimental program, with the creation of five experimental stations distributed throughout Portugal country, involving different environments (Elvas, Guimarães, Lisbon, Serra da Estrela and Viana do Castelo), where test specimens at three scales (material, connection and structure) were installed to evaluate its performance during the time; (ii) the development of numerical simulations, based on the results obtained in the monitoring carried out; and, (iii) making recommendations for the project. On the last 30th of October 2020, the seminar to conclude the FRPLongDur project took place in a Webinar mode, in which the main results were presented. The present eBook summarizes the presentations carried out

How to break access control in a controlled manner

The Electronic Medical Record (EMR) integrates heterogeneous information within a Healthcare Institution stressing the need for security and access control. The Biostatistics and Medical Informatics Department from Porto Faculty of Medicine has recently implemented a Virtual EMR (VEMR) in order to integrate patient information and clinical reports within a university hospital. With more than 500 medical doctors using the system on a daily basis, an access control policy and model were implemented. However, the healthcare environment has unanticipated situations (i.e. emergency situations) where access to information is essential. Most traditional policies do not allow for overriding. A policy that allows for Break-The-Glass (BTG) was implemented in order to override access control whilst providing for non-repudiation mechanisms for its usage. The policy was easily integrated within the model confirming its modularity and the fact that user intervention in defining security procedures is crucial to its successful implementation and use