Encontrados 31 documentos, a visualizar página 1 de 4
Effect of drying on the phenolic composition and antioxidant activity of leaves...
Gonçalves, Fernando; Barbosa, Rui; Barracosa, Paulo; Guiné, RaquelIn Portugal, the flowers of Cynara cardunculus L. are traditionally used for the production of cheese “Serra da Estrela”, because they are responsible for the phenomenon of the coagulation of milk. The leaves may be used in diet as teas, soups, stews or salads. The phenolic compounds, such as phenolic acids and flavonoids, have been associated to their potential health benefits.The objective of this work was to...
Biomass fly ashes as low-cost chemical agents for Pb removal from synthetic and...
Barbosa, Rui; Lapa, N.; Lopes, M. Helena; Gunther, Annika; Dias, Diogo; Mendes, BenildeThe main aim of this work was to study the removal efficiency of Pb from synthetic and industrial wastewaters by using biomass fly ashes. The biomass fly ashes were produced in a biomass boiler of a pulp and paper industry. Three concentrations of Pb2+ were tested in the synthetic wastewater (1, 10 and 1000 mg Pb/L). Moreover, two different wastewaters were collected in an industrial wastewater treatment plant ...
Compensação harmónica em inversores fotovoltaicos ligados à rede eléctrica
Barbosa, Rui Diogo RibeiroEstágio realizado na EFACEC, e orientado pelo Eng. Nuno Costa ; Tese de mestrado integrado. Engenharia Electrotécnica e de Computadores (Automação). Universidade do Porto. Faculdade de Engenharia. 2011
Study on the valorization routes of ashes from thermoelectric power plants work...
Barbosa, Rui Pedro FernandesThesis submitted to obtain the Doctoral degree in Energy and Bioenergy ; The main objective of this thesis was to study new valorization routes of ashes produced in combustion and co-combustion processes. Three main valorization pathways were analyzed: (i)production of cement mortars, (ii) production of concretes, and (iii) use as chemical agents to remove contaminants from wastewaters. Firstly, the ashes prod...
Biomimetic sensor based on hemin/carbon nanotubes/chitosan modified microelectr...
Santos, Ricardo M.; Rodrigues, Marcelo S.; Laranjinha, João; Barbosa, Rui M.A novel biomimetic microsensor for measuring nitric oxide (NO) in the brain in vivo was developed. The sensor consists of hemin and functionalized multi-wall carbon nanotubes covalently attached to chitosan via the carbodiimide crosslinker EDC followed by chitosan electrodeposition on the surface of carbon fiber microelectrodes. Cyclic voltammetry supported direct electron transfer from the FeIII/FeII couple of...
Estruturas de madeira lamelada colada reforçada com sistemas compósitos de FRP ...
Barbosa, Rui Manuel TeixeiraTese de mestrado integrado. Engenharia Civil (especialização em Materiais e Processos de Construção). Faculdade de Engenharia. Universidade do Porto. 2008
Sistema de detecção de falhas em rectificadores de tracção
Barbosa, Rui Manuel CoutoEstágio realizado na EFACEC e orientado pelo Eng.º Vítor Ferreira ; Tese de mestrado integrado. Engenharia Electrotécnica e de Computadores. Faculdade de Engenharia. Universidade do Porto. 2008
Guia multimédia portátil para museus
Barbosa, Rui Diogo MoreiraO presente trabalho descreve o estudo realizado sobre um sistema portátil de apoio a uma visita museológica, procurando compreender as características mais vantajosas e o modo de implementação mais favorável a tal sistema. Simultaneamente, é feita uma abordagem à percepção e ao grau de aceitação do público a um sistema deste género, no contexto da visita a um museu. De forma a responder a estas questões, foi de...
Innovative reactor prototype for Hydrogen production in a stationary applicatio...
Barbosa, Rui; Ferreira, V.; Silva, D.; Condes, J.; Ramos, S.; Amaral, V.; Pinto, A. M. F. R.; Figueiredo, A.; Rangel, C. M.Hydrogen storage has proved to be the greatest obstacle preventing hydrogen from replacing fossil fuels. Hence, a safe, efficient and economical method of storing hydrogen must be available to turn viable a hydrogen economy based on renewable resources [1]. Hydrogen can be stored in chemical hydrides such as sodium borohydride (NaBH4), with large theoretical H2 content of 10,9 wt%. With the aid of catalysts, an...
Agents in the market place an exploratory study on using intelligent agents to ...
Barbosa, Rui PedroTese de doutoramento em Informática ; This dissertation documents our exploratory research aimed at investigating the utilization of intelligent agents in the development of automated financial trading strategies. In order to demonstrate this potential use for agent technology, we propose a hybrid cognitive architecture meant for the creation of autonomous agents capable of trading different types of financial...
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