Fabiana Auricchio

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We develop new quadrature rules for Isogeometric Analysis based on the solution of a local nonlinear problem. A simple and robust algorithm is developed to determine the rules which are exact for important B-Spline spaces of uniform and geometrically stretched knot spacings. We consider both periodic and open knot vector configurations and illustrate the(More)
We initiate the study of collocation methods for NURBS-based isogeometric analysis. The idea is to connect the superior accuracy and smoothness of NURBS basis functions with the low computational cost of collocation. We develop a one-dimensional theoretical analysis, and perform numerical tests in one, two and three dimensions. The numerical results(More)
We extend the development of collocation methods within the framework of Isogeometric Analysis (IGA) to multi-patch NURBS configurations, various boundary and patch interface conditions, and explicit dynamic analysis. The methods developed are higher-order accurate, stable with no hourglass modes, and efficient in that they require a minimum number of(More)
BACKGROUND Henoch-Schönlein purpura (HSP) is the most common vasculitis in childhood; nevertheless, its etiology and pathogenesis remain unknown despite the fact that a variety of factors, mainly infectious agents, drugs and vaccines have been suggested as triggers for the disease. The aim of this study was to estimate the association of HSP with drug and(More)
Short-term and long-term clinical follow-up data clearly indicate the superiority of stenting techniques within the family of mechanical treatments for percutaneous coronary revascularizations. However, restenosis phenomena are in general still present, representing the major drawback for this innovative non-invasive approach. Experimental evidence(More)
This paper presents a new isolation device concept using shape memory alloy elements, to evaluate the possibility of its application and to investigate the effectiveness in reaching the structural design goals compared with traditional isolation devices. Shape memory alloys (SMAs) are characterized by unique mechanical properties due to solid-solid(More)
The great success of stents in treating cardiovascular disease is actually undermined by their long-term fatigue failure. The high variability of stent failure incidence suggests that it is due to several correlated aspects, such as loading conditions, material properties, component design, surgical procedure, and patient functional anatomy. Numerical and(More)
Isogeometric Analysis (IGA) has recently emerged as a cost-effective alternative to classic isoparametric Finite Element Analysis. In this work a novel computational framework is proposed in order to get IGA-suitable geometries to simulate different vascular minimally-invasive procedures. The preliminary results show the capability of the framework to(More)
We present different innovative formulations for shear deformable beams and plates exploiting the high inter-element continuity provided by NURBS basis functions. We develop isogeometric collocation methods in standard and mixed formulations as well as Galerkin methods using an alternative set of discrete variables. All methods are free of shear locking,(More)
Carotid artery stenting (CAS) is emerged as a safe and cost-effective treatment of carotid artery (CA) stenosis [1]. However the long-term efficacy of CAS is under clinical evaluation and, in particular, the role of in-stent restenosis (ISR) is not clear. More data and dedicated studies are necessary to elucidate the mechanisms of ISR and their relation(More)