Browsing by Issue Date, starting with "2019-02-2"
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- A decision support approach to provide sustainable solutions to the consumer, by using electrical appliancesPublication . Matias, João Carlos de Oliveira; Santos, Ricardo; Abreu, AntónioThe diversity of energy efficiency appliances existent on the market, with all its different issues, contributes to the existence of several tradeoffs (e.g., energy and water consumption vs.initial investment), which make the consumer’s choices in the market difficult. This becomes even more relevant, by knowing that nowadays a consumer tries to get a solution from the market, with a good compromise between the economic, social and environmental dimensions, and according to its priorities and specific needs, which can be different from other consumers. By adopting a multicriteria approach, combined with an optimization technique, based on evolutionary algorithms (EA), it will be possible to provide a set of sustainable solutions from the market to the consumer, that respects the compromise referred before. In this work, it will be presented an approach to support a decision-agent (DA) (consumer), by performing a set of sustainable choices based on electrical appliances, from the market and suitable to its needs. The method will be applied to a case study, to demonstrate its application. Regarding the obtained solutions, several savings are achieved (electrical and water consumption, CO2 emissions) by taking into account the consumer’s relative importance, regarding each dimension considered.
- Multi-objective optimization of pultruded composite sandwich panels for building floor rehabilitationPublication . Garrido, Mário; Madeira, JFA; Proença, M.; Correia, J. R.Composite sandwich panels are being increasingly considered for civil engineering structural applications, offering high versatility in constituent materials and their geometrical arrangement. This translates to a high number of design variables, in addition to a potentially large number of design requirements and objectives related to the panels' functions. This paper presents an optimization study of a composite sandwich panel system for building floor rehabilitation, using the Direct MultiSearch (DMS) method. Pultruded multicellular panels with a polyurethane (PUR) foam core and carbon- or glass-fibre reinforced polymer (C/GFRPF) faces and ribs/webs are considered. The panel architecture was defined using 3 geometrical variables and 14 material related variables. In addition, 8 competing objective functions were studied, related to aspects such as structural serviceability and resistance, thermal insulation, acoustic performance, cost minimization, and environmental performance. The results are presented in the form of Pareto optimal sets, from which several conclusions are drawn regarding common design-related options. The influence of core material density, of the number of ribs/webs, or of the type of fibre reinforcement and its respective layup on the different objective functions are addressed. Optimal solutions for meeting different design purposes are presented, providing useful insights for structural designers and sandwich panel manufacturers.
- Safe use of electric arc furnace dust as secondary raw material in self compacting mortars productionPublication . Lozano-Lunar, Angelica; Raposeiro Da Silva, Pedro; De Brito, Jorge; Fernandez Rodriguez, Jose Maria; Jimenez, Jose RamonThis research contributes to the development of the Circular Economy concept by managing waste through its use as a construction material. A novel process in which two samples of industrial waste Electric Arc Furnace Dust collected from two different steelwork plants are used as secondary raw material in the production of self-compacting mortars is proposed. At a previous stage, a characterisation of mortar material components was carried out. Then, self-compacting mortars with replacement ratios of 25%, 50% and 100% of siliceous filler with Electric Arc Furnace Dust were designed. The feasibility of Electric Arc Furnace Dust use was analysed by means of the study of mechanical strength, mineralogical, capillary properties and leaching behaviour in monolithic and granular state. The environmental classification of mortars, according to their leaching behaviour, was carried out in accordance with European Directive 2003/33/EC (2003). Electric Arc Furnace Dust incorporation modified the self-compactability and common hydration reactions. Mechanical strength decreased with Electric Arc Furnace Dust incorporation, although the mortar with 25% of replacement with one of the Electric Arc Furnace Dust's showed a negligible loss compared to the self-compacting reference mortar. Water absorption by capillarity increased with Electric Arc Furnace Dust content, consistently with the mortars' mechanical behaviour. The leaching behaviour analysis in a monolithic state revealed that all mortar releases were below the permitted limit. In a granular state, the mortar with the best mechanical behaviour was environmentally safe, leaving all the elements encapsulated by the self-compacting matrix. The results of this study contribute to Electric Arc Furnace Dust management through its valorisation as secondary raw material in the production of self-compacting mortars, addressing an unprecedented line of research.
- Safe use of electric arc furnace dust as secondary raw material in self-compacting mortars productionPublication . Lozano-Lunar, Angélica; Raposeiro Da Silva, Pedro; De Brito, Jorge; Fernandez Rodriguez, Jose Maria; Jimenez, Jose RamonThis research contributes to the development of the Circular Economy concept by managing waste through its use as a construction material. A novel process in which two samples of industrial waste Electric Arc Furnace Dust collected from two different steelwork plants are used as secondary raw material in the production of self-compacting mortars is proposed. At a previous stage, a characterisation of mortar material components was carried out. Then, self-compacting mortars with replacement ratios of 25%, 50% and 100% of siliceous filler with Electric Arc Furnace Dust were designed. The feasibility of Electric Arc Furnace Dust use was analysed by means of the study of mechanical strength, mineralogical, capillary properties and leaching behaviour in monolithic and granular state. The environmental classification of mortars, according to their leaching behaviour, was carried out in accordance with European Directive 2003/33/EC (2003). Electric Arc Furnace Dust incorporation modified the self-compactability and common hydration reactions. Mechanical strength decreased with Electric Arc Furnace Dust incorporation, although the mortar with 25% of replacement with one of the Electric Arc Furnace Dust's showed a negligible loss compared to the self-compacting reference mortar. Water absorption by capillarity increased with Electric Arc Furnace Dust content, consistently with the mortars' mechanical behaviour. The leaching behaviour analysis in a monolithic state revealed that all mortar releases were below the permitted limit. In a granular state, the mortar with the best mechanical behaviour was environmentally safe, leaving all the elements encapsulated by the self-compacting matrix. The results of this study contribute to Electric Arc Furnace Dust management through its valorisation as secondary raw material in the production of self-compacting mortars, addressing an unprecedented line of research.
- Management of innovation ecosystems based on six sigma business scorecardPublication . Calado, João Manuel Ferreira; Requeijo, José Gomes; Abreu, António; Dias, AnaIn the present context, companies to be competitive must develop high-performance innovation capabilities that enable them to respond quickly to market needs. However, the lack of tools and methodologies to assess the performance of innovation projects in an integrated way remains an obstacle. The paper begins by discussing the principles of Six Sigma and the Balanced Scorecard for performance evaluation. Next, the advantages of the Six Sigma Business Scorecard are discussed as a tool to support the evaluation of performance in innovation projects. Finally, the advantages of their application in the context of a collaborative ecosystem are discussed. It is illustrated that the BSC ensures that top management pays attention at any time to the specific elements of the Six Sigma implementation that are not working as planned, providing a link between strategy and quality initiatives assuring customers satisfaction in innovation projects.
- Expansão do terminal de contentores sul do porto de Leixões e instalação de guindastes em pórticos móveis : RTG-E's telecomandosPublication . Said, Francisco Amílcar Barros; Almeida, José Luís Rosa deO desenvolvimento do transporte marítimo e o aumento da movimentação mundial de contentores, conduziram, para o ambiente do Terminal de Contentores Sul do Porto de Leixões, os desafios logísticos da organização operacional. Para superar esse desafio foi necessário aproximar o conceito logístico da atividade de movimentação dos contentores no terminal. A avaliação e otimização operacional são aspetos fundamentais no sucesso de qualquer negócio. Nos diversos cenários de complexidade em que as empresas de transporte atuam, a redução de custos operacionais pode concretizar-se numa importante vantagem competitiva, reduzindo o tempo e o espaço. Nesse sentido, o presente trabalho tem como objetivo a identificação do estado da arte atual e apresenta o Projeto das Instalações Elétricas necessário para os sistemas a adotar na instalação de guindaste em pórtico móvel – Rubber Tyred Gantry - RTG-E telecomandado. Com este trabalho, pretendo contribuir demonstrando opções e recursos necessários para a execução do trabalho de aumento da capacidade produtiva do terminal.
- Pseudoscalar decays to gauge bosons at the LHC and at a future 100 TeV colliderPublication . Arhrib, Abdesslam; Benbrik, Rachid; El Falaki, Jaouad; Sampaio, Marco; Santos, RuiWe discuss the search for a CP-odd scalar decaying into gauge bosons in the frameworks of a CP-conserving two-Higgs doublet model (2HDM) and of a 2HDM extended with a vectorlike quark (VLQ) at the Large Hadron Collider and at a future 100 TeV collider. The rate of decay of a pseudoscalar to Z bosons could be important to ascertain the CP nature of the scalars in the model. In the 2HDM A -> ZZ will be extremely hard to detect even at a future 100 TeV pp collider while in the 2HDM+ VLQ this decay can be probed even during the present LHC run. We further discuss all decays of the pseudoscalar into gauge bosons at the LHC and at a future 100 TeV collider in the alignment limit where the lightest scalar is the 125 GeV Higgs with SM-like couplings to the fermions and gauge bosons.
- Os métodos indiretos de tributação: do regime jurídico à eventual responsabilização pela prática de infrações tributáriasPublication . Marinheiro, Ricardo Nuno; Domingos, Francisco NicolauA presente dissertação visa perceber quais os pressupostos que fazem a Administração fiscal recorrer a métodos excecionais de tributação previstos nas normas tributárias, mais concretamente, a tributação por métodos indiretos. É um regime de tributação subsidiária que está na maioria dos casos relacionado com práticas evasivas e fraudulentas dos contribuintes e que justificam a aplicação deste regime de tributação alternativo. Por isso, procura-se igualmente responder à questão se em processo penal será legítimo recorrer à prova por presunções, para incriminação do contribuinte que viu a sua matéria coletável ser corrigida por estes métodos. Acompanha-se o estudo com a visão da doutrina e decisões dos tribunais relevantes sobre cada tema em análise. É dada ainda uma visão comparada da aplicação destes métodos presuntivos em outro sistema fiscal de tradição jurídica romana de forma a perceber quais as principais diferenças e semelhanças com o regime português. Por fim são apresentadas as conclusões, reflexões e opiniões do autor sobre os temas analisados.