Recursos de colección

Biblioteca Digital do IPB (53.442 recursos)

A Biblioteca Digital do IPB, tem por objectivo divulgar e permitir o livre acesso à produção científica produzida pela comunidade académica, promovendo a integração, partilha e a visibilidade da informação científica e garantindo a preservação da memória intelectual do Instituto Politécnico de Bragança.

DMA - Posters em Encontros Científicos Internacionais

Mostrando recursos 1 - 8 de 8

  1. Thermal analysis of wood-steel hybrid construction

    Fonseca, E.M.M.; Ramos, H.M.E.; Silva, H.J.G.; Ferreira, Débora
    Main goal of this work is to present a numerical model to study the thermal necrosis due a dental drilling process, with and without water irrigation. Also an experimental methodology is used to measure the thermal occurrence in a pig mandible. Motivation, the assessment of bone damage, using the temperature criterion (above 55ºC.

  2. Measuring displacement field detection of unbounded regions in a single lap Joint with moiré

    Ribeiro, J.E.; Vaz, M.A.P.; Lopes, H.; Monteiro, J.; Piloto, P.A.G.
    The goal of this work is the development of an experimental technique to measure the displacement field and to perform detection of unbonded regions [1] in a single lap joint [2, 3]. The proposed experimental technique is based on the use of Moiré Interferometry. It is a field technique that allows in-plane displacement measurements without contact and with high resolution [4, 5]. Grating replication techniques were developed to record high quality diffraction gratings onto the specimen’s surfaces [6]. It was also, developed an optical assembly of laser interferometry used to generate the master grating (virtual) [7]. A tension load was...

  3. Mechanical behaviour of dental composite filling materials using digital holography

    Monteiro, J.M.; Lopes, H.; Vaz, M.A.P.; Campos, J.C. Reis
    One of the most common clinical problems in dentistry is tooth decay. Among the dental filling materials used to repair tooth structure that has been destroyed by decay are dental amalgam and composite materials based on acrylics. Dental amalgam has been used by dentists for the past 150 years as a dental restorative material due to its low cost, ease of application, strength, durability, and bacteriostatic effects. However its safety as a filling material has been questioned due to the presence of mercury. Amalgam possesses greater longevity when compared to other direct restorative materials, such as, composite [1]. However, this difference...

  4. Strain fields adjacent to bone-implant interfaces : strain field analysis using digital image techniques

    Nabais, C.; Monteiro, J.; Lopes, H.; Vaz, M.A.P.; Guedes, R.M.
    When using conventional surface strain measurement techniques, the measurement of the deformation within concellous bone is frequently hampered by the material’s highly porous structure and poor mechanical properties. Although detailed strain maps derived from actual experimental data have the potential to resolve many questions concerning the mechanics of the concellous bone, the traditional method of producing maps through the measurements with optical technique has been applied infrequently to the study of this materials.

  5. Dynamic sedimentation measurements of physiological fluids in biomedical devices

    Garcia, Valdemar; Correia, Teresa Montenegro; Dias, Ricardo P.; Lima, R.
    Currently, biomedical microdevices are becoming one of the most promising tools for the diagnostic and treatment of several diseases, such as diabetes, malaria and cancer. Hence, it is increasingly important to investigate the rheological behaviour of physiological fluids in microchannels in order to make use on the physics of microfluidics to either develop new lab-on-chip devices and to optimize the design of existent biomicrofluidics chips. The main objective of this study is to investigate the flow behaviour of two different physiological fluids frequently used in biomedical microdevices. The working fluids used in this study were physiological saline (PS) and dextran 40...

  6. Measuring displacement field and detection of unbonded regions in a single lap joint with Moiré intereferometry

    Ribeiro, J.E.; Vaz, M.A.P.; Lopes, H.; Monteiro, J.; Piloto, P.A.G.
    Adhesives are increasingly being used to replace traditional fastening methods in industrial applications such as welding, bolts and rivets. In cars and other transport applications, weight reduction is a key factor in new developments, hence the use of lightweight adhesives is rapidly expanding. Adhesives are used to bond many different material types including ceramics, metals, glass, plastics and composites. The key advantages of adhesives include the distribution of loads across the entire joint area, excellent fatigue properties, attenuation of mechanical vibrations and noise, sealant functions, reduction in galvanic corrosion between dissimilar metals, and a faster more cost-effective assembly method. The goal of this work is the development of an...

  7. Strain field analysis of cancellous bone under compression by image correlation

    Lopes, H.; Nabais, C.; Guedes, R.M.; Morais, J.L.; Simões, J.A.
    Experimental mechanical analysis of cancellous bone has been performed to capture the global strain field of specimens under compression. One major objective is to assess the test procedure and obtain the cancellous bone mechanical properties. Now a day, several techniques are available for the experimental measurement of the field displacement. Among them, the Cross-Correlation is one of most simple’s techniques and can be applied to several studies cases. Based on the correlation of random speckle pattern between two images, the spatial displacement fields can be accessed. A simple digital camera or video recorder can be used without special light to capture the surface intensity...

  8. Structural monitoring of the Monastery of Jerónimos

    Oliveira, Daniel V.; Ramos, Luis F.; Lourenço, Paulo B.; Roque, João C. Almendra
    The paper details two monitoring systems implemented in the main nave of Santa Maria of Belém Church of the Monastery of Jerónimos, in Lisbon. The monitoring systems were installed to better understand the static and dynamic behavior of the structure, aiming at the damage detection and the improvement of seismic resistance of the monument. Preliminary investigations, numerical non-linear analyses and the first dynamic modal identification analyses are described in the paper. Also the preliminary works for the monitoring systems are presented, including the points selected for observation, discussion of the sensors technical characteristics, as well as preliminary inspection and diagnosis. The first results of the dynamic...

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