Encontrados 7 documentos, a visualizar página 1 de 1
Energy harvesting performance of piezoelectric electrospun polymer fibers and p...
Nunes-Pereira, João; Sencadas, Vitor; Correia, Vitor; Rocha, José Gerardo; Lanceros-Mendez, SenentxuThe energy harvesting efficiency of electrospun poly(vinylidene fluoride), its copolymer vinylidene fluoride-trifluoroethylene and composites of the later with piezoelectric BaTiOon interdigitated electrodes has been investigated. Further, a study of the influence of the electrospinning processing parameters on the size and distribution of the composites fibers has been performed. It is found that the best e...
Piezoresistive sensors for force mapping of hip-prostheses
Correia, Vitor; Sencadas, Vitor; Martins, Marcos S.; Ribeiro, Clarisse; Alpuim, Pedro; Rocha, José G.; Iñigo, Morales; Atieza, CarlosThe success of artificial prosthetic replacements depends on the fixation of the artificial prosthetic component after being implanted in the thighbone. The materials for fixation are subject to mechanical stresses, which originate permanent deformations, incipient cracks and even fatigue fractures. This work shows the possibility of monitoring the mechanical stress over time in prosthesis. In this way, highly ...
Development of piezoresistive sensors for biomedical applications
Correia, Vítor Manuel GomesTese de doutoramento em Engenharia Electrónica Industrial e de Computadores ; In the last decades there has been an increase in sensing systems applied in a variety of situations with a large variety of sensor ranges. This represents a growing area with high potential. One of the areas of sensor development that require a great deal of attention is the area of sensor for biomedical applications and biosensor...
Optimization of piezoelectric ultrasound emitter transducers for underwater com...
Martins, Marcos da Silva; Correia, Vítor; Cabral, José; Lanceros-Méndez, S.; Rocha, J. G.Ultrasound transducers are typically based on piezoelectric materials, due to their good response at high frequencies. Depending on the application, ceramics, polymers and composite materials can be used. In this work, an optimization study of ultrasound transducers for underwater communications is addressed, focusing on a piston type emitter transducer operating in thickness mode (d33). The piston is constitut...
Utilização de agregado trióxido mineral (MTA) em Odontopediatria
Correia, Vítor Gabriel SerpaMestrado Integrado em Medicina Dentária ; Master Degree in Dental Medicine
Prospecção de filões aplito-pegmatíticos mineralizados em espodumena com recurs...
Correia, Vítor Manuel dos SantosObra em 3 volumes ; Tese de mestrado. Tecnologia e Gestão de Recursos Minerais. Faculdade de Engenharia. Universidade do Porto. 1997
Piezoresistive silicon thin film sensor array for biomedical applications
Alpuim, P.; Correia, Vítor; Marins, Emílio Sérgio; Rocha, J. G.; Trindade, Isabel; Lanceros-Méndez, S.N-type hydrogenated nanocrystalline silicon thin film piezoresistors, with gauge factor −28, were deposited on rugged and flexible polyimide foils by Hot-wire chemical vapor deposition using a tantalum filament heated to 1750 °C. The piezoresistive response under cyclic quasi-static and dynamical (up to 100 Hz) load conditions is reported. Test structures, consisting of microresistors having lateral dimensions ...
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