Encontrados 145 documentos, a visualizar página 1 de 15
A novel modified acrylic bone cement matrix. A step forward on antibiotic deliv...
Matos, A. C.; Gonçalves, L. M.; Rijo, P.; Vaz, M. A.; Almeida, A. A.; Bettencourt, A. F.Currently the safe and responsible use of antibiotics is a world-wide concern as it promotes prevention of the increasing emergence of multiresistant bacterial strains. Considering that there is a noticeable decline of the available antibiotic pipeline able to combat emerging resistance in serious infection a major concern grows around the prosthetic joint infections once the available commercial antibiotic loa...
Bronquiolite numa Unidade de Cuidados Intensivos Neonatais
Melo, M.ª José; Costa, Agostinha; D'Orey, Conceição; Vaz, M.ª Luísa; Guimarães, HercíliaOs autores fazem a revisão dos casos de bronquiolite internados no Serviço de Neonatologia do Hospital de S. João nos anos de 1992 a 1996. Foram analisados os seguintes parâmetros: idade, sexo, idade gestacional, existência de patologia cardíaca ou pulmonar ao nascimento e malformações congénitas, variação sazonal, duração do internamento, identificação de vírus respiratórios nas secreções, alterações radiológi...
Assessing foraging strategies of herbivores in Mediterranean oak woodlands: a r...
Ferraz de Oliveira, M.I.; Lamy, E.; Bugalho, M.N.; Vaz, M; Pinheiro, C; Abreu, M.C.; Capela e Silva, F.; Sales-Baptista, E.Montados are agro-silvo-pastoral ecosystems, typical of the Southwest Iberian Peninsula, of high socio-economic and conservation importance,where grazing is a dominant activity. Montados are characterized by na open tree canopy of Quercus sp. and a diverse undercover of shrubs and grasslands that constitute the plant food resources for grazing animals. Plant food resources of Montados are highly variable, both ...
Análise do comportamento mecânico dos discos intervertebrais da região lombar q...
Mendonça, B.; Ribeiro, J.E.; Vaz, M.; Lopes, H.: Neste trabalho pretende-se caracterizar o campo de deslocamentos e deformações de um disco intervertebral, assim como avaliar a aplicação da técnica de Correlação Digital de Imagem (CDI) neste tipo de material. Para a realização deste trabalho, foi montado um ensaio de compressão de uma coluna vertebral e através do equipamento de CDI foi possível a realização de uma análise global do campo de deslocamentos o...
Análise do comportamento mecânico dos discos intervertebrais da região lombar q...
Mendonça, B.; Ribeiro, J.E.; Vaz, M.; Lopes, H.Neste trabalho pretende-se caracterizar o campo de deslocamentos e deformações de um disco intervertebral, assim como avaliar a aplicação da técnica de Correlação Digital de Imagem (CDI) neste tipo de material. Para a realização deste trabalho, foi montado um ensaio de compressão de uma coluna vertebral e através do equipamento de CDI foi possível a realização de uma análise global do campo de deslocamentos oco...
A selective phase filter based on speckle decorrelation
Lopes, H.; Ribeiro, J.E.; Santos, J.; Vaz, M.A new phase filter technique based on the speckle decorrelation analysis is proposed on this paper to remove the noise from the phase maps. The phase maps are extracted from speckle interferometry static measurements using the four phase shifted intensities, with the constant phase step of π/2. The speckle descorrelation points are then selected based on the average phase step of the reference and deformation s...
A selective phase filter based on speckle decorrelation
Lopes, H.; Ribeiro, J.E.; Santos, J.V. dos; Vaz, M.A.P.A new phase filter technique based on the speckle decorrelation analysis is proposed on this paper to remove the noise from the phase maps. The phase maps are extracted from speckle interferometry static measurements using the four phase shifted intensities, with the constant phase step of π/2. The speckle descorrelation points are then selected based on the average phase step of the reference and deformation s...
Displacement and strain field assessment of PDMS using digital image correlation
Mendonça, B.; Ribeiro, J.E.; Lopes, H.; Martins, P.; Vaz, M.The main goal of this work is the characterization of the hyper-elastic mechanical behaviour of PDMS. The special specimens of PDMS (Sylgard® 184) were tested in a bi-axial tensile machine. The displacement and strain fields were measured using a commercial digital image correlation system (ARAMIS of GOM) during the tensile test. The experimental measurements are compared with numerical simulations, which use t...
Damage identification using real time rotating field analysis
Lopes, H.; Ribeiro, J.E.; Santos, J.V.A. dos; Vaz, M.A.P.; Gomes, J.F.S.This paper proposes a real time damage identification method based on the perturbation analysis of the rotation field, which are measured using shearography technique. A particular case of phase modulation method is applied to the interference pattern in order to improve the spatial resolution of the rotation field. A program was developed in Matlab® platform for digital recording the information capture by CCD...
Displacement and strain field assessment of PDMS using digital image correlation
Mendonça, B.; Ribeiro, J.E.; Lopes, H.; Martins, P.; Vaz, M.; Gomes, S.The main goal of this work is to characterize the hyper-elastic mechanical behaviour of PDMS. For that, were made-up special specimens of PDMS (Sylgard® 184) for test them in bi-axial tensile machine. During the tensile test was used a commercial digital image correlation system (ARAMIS of GOM) to obtain de displacement and strain fields. These measurements are compared with numerical simulations which uses the...
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