Search results for "Analisi numerica"
showing 10 items of 111 documents
Analisi teorico-sperimentale del comportamento ciclico di sezioni di estremità di travi prefabbricate reticolari miste
2009
Si indaga sul comportamento sismico di travi prefabbricate reticolari miste, non autoportanti in prima fase, nelle quali il traliccio prefabbricato è costituito da un piatto inferiore di acciaio tipo S355, ed un corrente superiore realizzato con barre di acciaio da cemento armato di tipo B450C, collegate da un anima costituita da barre sagomate a V rovescia inclinate. Vengono mostrati i risultati di una prova a flessione su tre punti su un campione rappresentativo di una coppia di travi convergenti a un nodo, collegate ad un pilastro in c.a. con connessione gettata in opera. La prova è stata condotta con più cicli di carico a momento positivo, di cui uno di grande ampiezza e uno successivo …
Some Numerical Remarks on a Meshless Approximation Method
2016
In this paper we consider sources of enhancement for the Smoothed Particle Hydrodynamics method in approximating a function and its derivatives. It is well known that the standard formulation is usually poor when scattered data distribution is considered or when the approximation near the boundary occurs. In this paper studies on the accuracy are provided and assessed with gridded and scattered data distribution in the problem domain. The improvements of the method are addressed and supporting numerical experiments are included.
An Improved Solver for the M/EEG Forward Problem
2014
Noninvasive investigation of the brain activity via electroencephalography (EEG) and magnetoencephalography (MEG) involves a typical inverse problem whose solution process requires an accurate and fast forward solver. We propose the Method of Fundamental Solutions (MFS) as a truly meshfree alternative to the Boundary Element Method (BEM) for solving the M/EEG forward problem. The solution of the forward problem is obtained, via the Method of Particular Solutions (MPS), by numerically solving a set of coupled boundary value problems for the 3D Laplace equation. Numerical accuracy and computational load are investigated for spherical geometries and comparisons with a state-of-the-art BEM solv…
UN SOLUTORE MESHFREE PER M/EEG
2014
IL METODO DELLE SOLUZIONI FONDAMENTALI PER LA SOLUZIONE DEL PROBLEMA DIRETTO M/EEG
2015
The research already started on the mesh-free solution of the M / EEG direct problem has led to the development of a solver based on the method of fundamental solutions (MFS, method of fundamental solutions) able to manage the physical-geometric complexity of realistic models of the head more efficiently than traditional.
UN SOLUTORE MESHFREE PER EEG/MEG
2013
STIMA DEL POTENZIALE ELETTRICO IN tDCS CON APPROCCIO MESHLESS INNOVATIVO
2015
Transcranial DC stimulation (transcranial Direct Current Stimulation, tDCS) is a non-invasive technique aimed at modifying neuronal activity for the purpose therapeutic and / or for the improvement of mental performance. A continuous current of entity modest (below the threshold of perception) is injected into the brain via electrodes placed on the scalp surface to produce changes in long-term cortical activity. Despite the increasing use of this and other similar techniques, and the relevant ones applications - for example in the field of neuropsychological rehabilitation - their impact on neuronal activity is not yet fully known, mainly due to the difficulty of predict the spatial distrib…
Studi sull’accuratezza numerica di un solutore meshfree per l’approssimazione di campi
2016
L’attività di ricerca è stata finalizzata allo studio di metodologie numeriche avanzate senza reticolazioni per l’approssimazione di funzioni e sue derivate. In particolare si sono condotti studi sull’accuratezza e convergenza del metodo Smoothed Particle Hydrodynamics riferendosi a campionamenti regolari e non