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 - Capítulos de Livros

Mostrando recursos 1 - 13 de 13

  1. Biomedical applications and 3D rapid prototyping

    Fonseca, E.M.M. (Ed.); Teixeira, M.C.M. (Ed.)
    The main objective of this paper was to assess the cortical bone thickness of human lumbar vertebra, through Computed Tomography (CT) images by using both image processing software and rapid prototyping (RP) experimental methodologies. The study here presented focus sixteen postmenopausal patients from the North of Portugal, with age between 50 and 85 years, collected from May to June 2011. All clinical data were obtained in a Medical Centre of Radiology and Imaging, in Porto. Results regarding cortical bone thickness and biomechanical resistance of human lumbar vertebra are presented. The acquirement of accurate values concerning cortical bone thickness could improve the prediction of fracture risk.

  2. Safety of wooden structures

    Fonseca, E.M.M. (Coord.); Ferreira, D.R.S.M. (Coord.)
    Proceedings IRF2013 4th International Conference on Integrity, Reliability and Failure FunchallPortugal, 23-27 June 2013

  3. Mass transfer models for oxygen-water co-current flow in vertical bubble columns

    Garcia, Valdemar; Sobrinho Teixeira, João
    The present work reports a theoretical and experimental study of mass transfer for oxygen-water co-current flow in vertical bubble columns. The axial dispersion of liquid phase was also studied. Experiments were carried out in a 32 mm internal diameter and 5.35 and 5.37 m height columns. The superficial liquid velocity ranged from 0.3 to 0.8 m/s and volumetric flow rate ratio of gas to liquid ranged from 0.015 to 0.25. Mathematical models were developed to predict concentration of gas dissolved in the liquid as function of different physical and dynamic variables for two-phase cocurrent downflow and upflow. We obtained for the...

  4. Mass transfer models for oxygen-water co-current flow in vertical bubble columns

    Garcia, Valdemar; Sobrinho Teixeira, João
    The present work reports a theoretical and experimental study of mass transfer for oxygen-water co-current flow in vertical bubble columns. The axial dispersion of liquid phase was also studied. Experiments were carried out in a 32 mm internal diameter and 5.35 and 5.37 m height columns. The superficial liquid velocity ranged from 0.3 to 0.8 m/s and volumetric flow rate ratio of gas to liquid ranged from 0.015 to 0.25. Mathematical models were developed to predict concentration of gas dissolved in the liquid as function of different physical and dynamic variables for two-phase cocurrent downflow and upflow. We obtained for the...

  5. A finite element formulation for piping structures based on thin shell displacements theory

    Fonseca, E.M.M.; Melo, F.J.M.Q. de; Madureira, M.L.R.

  6. In vitro blood flow behaviour in microchannels with simple and complex geometries

    Garcia, Valdemar; Dias, Ricardo P.; Lima, R.
    Over the years, various experimental methods have been applied in an effort to understand the blood flow behaviour in microcirculation. The development of optical experimental techniques has contributed to obtain possible explanations on the way the blood flows through microvessels. In recent years, due to advances in computers, optics, and digital image processing techniques, it has become possible to combine a conventional particle image velocimetry (PIV) system with an inverted microscope and consequently improve both spatial and temporal resolution. The present review outlines our most relevant studies on the flow properties of blood at a microscale level by using current...

  7. A Engenharia e a Biomedicina. Cap. XXXIV

    Fonseca, E.M.M.; Piloto, P.A.G.; Campos, J.C. Reis; Secca, Mário F.

  8. A engenharia e a biomedicina - Cap. XXXVI

    Fonseca, E.M.M.; Teixeira, Cristina

  9. Perfomance based design of building structural frames using static non-linear analysis

    Barros, R.C.; Braz-César, M.T.
    In the design of structures under seismic actions several methodologies can be used to describe the structural seismic response. The recent role of performance based design led to the development and use of methods based on non-linear analysis, namely the so-called pushover analysis. This analysis is a particularly realistic methodology to evaluate the seismic performance of a structural system since the time dependence of the structural behaviour, namely through material and/or geometric non-linearity, is included in the methodology. The pushover analysis is a simplified methodology to obtain the structural response to seismic actions through a non-linear static analysis. This analysis evaluates the performance of the structures through control of...

  10. Computer simulation in biomedical applications

    Fonseca, E.M.M. (Ed.); Barbosa, Tiago M. (Ed.)
    The Symposium ‘’Computer Simulation in Biomedical Applications’’ intends to provide a venue for researches, students and different professionals, to learn and to exchange scientific knowledge about the following areas: biomechanical analysis, materials and tissue engineering, structural integrity in biomedical applications, musculoskeletal motion simulations and gait analysis. This Symposium will afford an increase of knowledge in biomedical engineering.

  11. Gas-liquid flow dispersion in a vertical pipe

    Garcia, Valdemar; Sobrinho Teixeira, João
    The main purpose of this work was to analyse the transport f a solute dissolved in a flowing liquid in upward direction at low velocity along a vertical column, in the bottom of which slugs are injected. These experiments were carried out in a column with an internal diameter of 19 mm and height of 344.2 cm. Liquid flowrates of 1.0, 2.5 and 5.5 cm3/s were utilized, and an enlarged variety of gas flowrates were injected; in these conditions the slugs were normally formed at a frequency between 0.78 and 88.1 s-1. The scientific techniques used in this study based on...

  12. Gas-liquid flow dispersion in a vertical pipe

    Garcia, Valdemar; Sobrinho Teixeira, João
    The main purpose of this work was to analyse the transport f a solute dissolved in a flowing liquid in upward direction at low velocity along a vertical column, in the bottom of which slugs are injected. These experiments were carried out in a column with an internal diameter of 19 mm and height of 344.2 cm. Liquid flowrates of 1.0, 2.5 and 5.5 cm3/s were utilized, and an enlarged variety of gas flowrates were injected; in these conditions the slugs were normally formed at a frequency between 0.78 and 88.1 s-1. The scientific techniques used in this study based on...

  13. Numerical validation of the experimental cyclic response of RC frames

    Braz-César, M.T.; Oliveira, Daniel V.; Barros, R.C.
    In this paper is estimated the numerical cyclic response of RC frames with and without masonry infill’s through a simplified nonlinear analysis using a commercial finite element method (FEM) package. The numerical model is based on the experiments carried out in the National Laboratory of Civil Engineering (LNEC) and the numerical and experimental results are compared to assess the accuracy of the simplified analysis for the bare frame and for the infill frame. To take into account the highly nonlinear behaviour of reinforced concrete (RC) frames due to large deformations, a numerical model based on the inelastic hinge method is...

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.