Percorrer por autor "Gaspar, Miguel Belbut"
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- Computer-aided optimization in additive manufacturing: Processing parameters and 3D scaffold reconstructionPublication . Alves, Nuno; Gaspar, Miguel Belbut; Pascoal-Faria, PaulaScaffolds are implantable bio-absorbable systems capable of regenerating osteoporotic bone or other native tissues. Additive Manufacturing processes are used to produce scaffolds with customized external shape and predefined internal morphology, allowing some control over pore size and distribution. Despite significant advances in Additive Manufacturing processes, the experimental optimization of processing parameters is time-consuming and expensive usually generating biomaterials waste. Moreover, the manufacturing of such polymeric or hybrid scaffolds requires time-consuming human supervision procedures. Subsequently, measurements of the scaffold’s architecture such as filament diameter, distance between two consecutive filaments, pore geometry and size, and total porosity are usually performed using computer tomography or microscopy, which also requires significant human and physical resources. This research work intends to overcome some aforementioned limitations through the development of a novel approach based on in-situ computer-aided optimization of the extrusion-based processing parameters.
- A procedure for computing the symmetric difference of regions defined by polygonal curvesPublication . Gaspar, Miguel Belbut; Martins-Ferreira, NelsonGiven any two regions A, B in the plane, defined by polygonal (simple, closed and oriented) curves, associated with their respective boundaries, we describe a procedure to compute the symmetric difference A ⊕ B. The output is also presented in the form of polygonal curves, where in particular the curves describing the union A ∪ B, the intersection A ∩ B, the difference A \ B, and the complement of the difference B \ A, are also obtained. This is related with the two equivalent formulas to compute the symmetric difference, namely A ⊕ B = (A ∪ B) \ (A ∩ B) = (A \ B) ∪ (B \ A).
- Rosin Based Composites for Additive ManufacturingPublication . Sousa, Dora; Biscaia, Sara; Viana, Tânia; Gaspar, Miguel Belbut; Mahendra, Vidhura; Mohan, Saeed D.; Mateus, Artur; Mitchell, GeoffreyRosins are the non-volatile exudates of pine resins with hydrophobic characteristics that are widely used as a precursor for many industrial applications. In this paper we discuss the nature, process and its applications as a matrix for a composite material for additive manufacturing. The composite material has been tailored to chemical and mechanical properties with respect to their applications.
- Sobre o cálculo dos ângulos de sopé e de convergência para veículos automóveisPublication . Martins-Ferreira, N.; Gaspar, Miguel Belbut; Mateus, Artur