Browsing by Author "Moleiro, Filipa"
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- Fatal acute necrohaemorrhagic pancreatitis with massive intraperitoneal and retroperitoneal bleeding: a rare cause of exsanguinationPublication . Querido, Sara; Carvalho, Inês; Moleiro, Filipa; Póvoa, Pedro"An otherwise healthy 37-year-old man was admitted to hospital with uncontrollable vomiting and abdominal pain. Lithiasic acute pancreatitis was diagnosed on the basis of clinical symptoms along with raised serum amylase levels and compatible findings in ultrasonography and CT scan. Two Ranson criteria (lactate dehydrogenase over 350 U/L and aspartate aminotransferase over 250 U/L) were present at admission. The patient was transferred to an intensive care unit (ICU); intravenous crystalloids were prescribed and analgaesics were administered for pain relief. Unexpectedly, 10 h after ICU admission, he presented a cardiac arrest with a non-defibrillate rhythm and died after 40 min of advanced life support. An autopsy was performed and revealed acute necrohaemorrhagic pancreatitis with massive intraperitoneal and retroperitoneal haemorrhage. This case report summarises the epidemiology, pathophysiology and risk factors for fatal bleeding acute pancreatitis."
- Layerwise mixed least-squares finite element models for free vibration analysis of multilayered piezoelectric composite platesPublication . Mesquita, Teresa; Moleiro, Filipa; Araujo, A. L.; Soares, C. M.Mota; Soares, C. A. MotaThis work provides an assessment of a finite element model based on layerwise mixed formulation using least squares applied to plate sandwich structures with skins made of piezoelectric layers and the core with composite angle play laminate layers. The extension to free vibration analysis is developed. The model assumes a layerwise variable description of displacements, transverse stresses and in-plane strains, taken as independent variables. The layerwise mixed formulation enables the fulfilment of the so-called C0z, yielding, for free vibration analysis a symmetric quadratic eigenvalue problem. The present model has nine degrees of freedom(dof ) per node in the core and in the upper and lower piezoelectric skins thirteen (nine to mechanical and four electrical) per node. The numerical examples show that the model predictive capabilities are in excellent agreement with three-dimensional exact solutions and also with available alternative models, from very thick to very thin sandwich piezoelectric plates.
- Optimization of fibers orientation in a composite specimenPublication . Monte, Sara M. C.; Infante, Vírginia; Moleiro, Filipa; Madeira, J. F. A.The main purpose of this study was to optimize the fibers orientation in a composite specimen with the objective to minimize the displacement. This composite specimen can be used in aerospace or mechanical structures. The objective function was performed with static analysis by altering the fibers orientation in a finite element solid model, computed using the ANSYS program. A recent method for global optimization GLODS (Global and local optimization using direct search) was used for the optimization process. In the sequence, specimens were manufactured and experimental tested, in o order to validate the numerical results obtained.