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Evaluation Of The Performance Of Three Spacers
Abreu, Sofia; Silva, Luis F; Teixeira, Senhorinha; Marques, Helena C; Ramalhete, Nuno; Antunes, HenedinaIntroduction: Several aspects are known to influence the drug distribution within the low respiratory tract, with particular emphasis on those related to the inhalation device. The aim of this work was to assess the performance of three spacers in the drug release, and also the quantity of active agent deposited inside these devices. Materials and Methods: In order to evaluate the behaviour of particles in susp...
Automatic presser-foot force control for industrial sewing machines
Carvalho, Helder; Silva, Luís F.; Rocha, A. M.; Monteiro, João L.To develop and test control methods for real-time automatic presser-foot force control in industrial sewing machines. In this work, a closed-loop controller that controls presser-foot maximum vertical displacement is presented and compared to existing solutions that adjust force depending on sewing speed. Automatic force control can reduce problems such as stitch irregularity, stitch distortions and material da...
Efficiency of different techniques in flexural strengthening of RC beams under ...
Sena-Cruz, José; Barros, Joaquim A. O.; Coelho, Mário R. F.; Silva, Luís F. F. T.In the context of flexural strengthening of concrete structures, fiber reinforced polymers (FRP) have been used mostly by two main techniques: Externally Bonded Reinforcement (EBR) and Near-Surface Mounted (NSM). Both strengthening techniques are applied on the cover concrete, which is normally the weakest region of the element to be strengthened. Consequently, the most common problem is the premature failure o...
Avaliação do desempenho de três câmaras de expansão
Abreu, Sofia; Silva, Luís F.; Teixeira, S. F. C. F.; Marques, Helena da Costa; Ramalhete, Nuno; Antunes, HenedinaAgradecimentos às empresas GlaxoSmithKline (Portugal) e Astrazeneca (Suécia), pela cedência das câmaras de expansão Volumatic ® e NebuChamber®, respectivamente. ; Introdução: Existem vários factores que afectam a distribuição do fármaco nas vias áreas inferiores, onde podemos destacar os factores associados ao próprio dispositivo de inalação. Este trabalho tem como objectivo avaliar o desempenho da libertação ...
Modeling of the condyle elements within a biomechanical knee model
Ribeiro, Ana Barros; Rasmussen, John; Flores, Paulo; Silva, Luís F.The development of a computational multibody knee model able to capture some of the fundamental properties of the human knee articulation is presented. This desideratum is reached by including the kinetics of the real knee articulation. The research question is whether an accurate modeling of the condyle contact in the knee will lead to reproduction of the complex combination of flexion/extension, abduction/add...
Estudo, conceção e construção de um sistema pneumático de aplicação de carga cí...
Seabra, Eurico; Guedes, A.; Barbosa, J.; Silva, Luís F.The joining process carried out in the solid state, named Pressuring Diffusion Welding (PDW), is a modified version of Diffusion Welding (DW). In PDW, the load applied to the samples to be joined varies in a sine wave pattern during the whole process instead of being kept constant as in DW. The PDW process produces high strength joints, due to the fact that the load wave pattern enhances rupture of the oxide sc...
Efficiency of different FRP-based flexural strengthening techniques in beams su...
Sena-Cruz, José; Barros, Joaquim A. O.; Coelho, Mário R. F.; Silva, Luís F. F. T.Flexural strengthening of reinforced concrete (RC) structures with fiber reinforced polymers (FRP) has been used mostly by two main techniques: Externally Bonded Reinforcement (EBR) and Near-Surface Mounted (NSM). In both strengthening techniques the FRP systems are applied on the cover concrete, which is normally the weakest region of the element to be strengthened. Consequently, the most common problem is the...
Experimental and numerical study of distinct techniques to strengthen beams fai...
Sena-Cruz, José; Barros, Joaquim A. O.; Coelho, Mário R. F.; Silva, Luís F. F. T.With the purpose of study three distinct techniques to strengthen beams failing in bending under monotonic loading, an experimental program was carried out. Three techniques are analyzed: Externally Bonded Reinforcement (EBR), Near-Surface Mounted (NSM) and Mechanically Fastened and Externally Bonded Reinforcement (MF-EBR). Unidirectional CFRP laminates were used for the case of the EBR and NSM techniques, wher...
A formal approach for aerospace systems control considering SFC specification a...
Borges, Paulo; Machado, José Mendes; Seabra, Eurico; Silva, Luís F.The C programming language is one of the most used in critical embedded real-time controllers applied at aerospace systems. Despite its potential, it is a very general language, with many maintenance problems and with a little or without graphical structure. The absence of formal verification techniques - even if it is possible to find some works associated to C programming language formal verification - is a f...
Design and development of a feeding aid device to assist people with deficiency
Seabra, Eurico; Silva, Luís F.; Machado, José MendesThe present work intends to design new devices of aid to the feeding for individuals with deficiency. Like this, along this paper they are referred the most relevant pathologies, which affect the autonomy of the patient’s feeding, as well as some existent devices in the market. Based on the characteristics of these devices, this research was performed with the main objective of finding the most appropriate actu...
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