Search results for "ANALISI"
showing 10 items of 1536 documents
Detecting tri‐stability of 3D models with complex attractors via meshfree reconstruction of invariant manifolds of saddle points
2018
In mathematical modeling it is often required the analysis of the vector field topology in order to predict the evolution of the variables involved. When a dynamical system is multi-stable the trajectories approach different stable states, depending on the initialmconditions. The aim of this work is the detection of the invariant manifolds of thesaddle points to analyze the boundaries of the basins of attraction. Once that a sufficient number of separatrix points is found a Moving Least Squares meshfree method is involved to reconstruct the separatrix manifolds. Numerical results are presented to assess the method referring to tri-stable models with complex attractors such as limit cycles o…
L’analisi della conversazione istituzionale: applicazioni e prospettive
2015
La Conversation Analysis si occupa del parlato quotidiano, di interazioni comunicative qualsiasi, tra amici o sconosciuti, tra commesso e cliente, insegnante e allievi, terapeuta e paziente. Gli esempi delle applicazioni potrebbero essere infiniti, dato che la conversazione e le sue varianti "istituzionali", come l’intervista o il dibattito, costituiscono la forma di comunicazione più immediata e diffusa. Nell'articolo l’autrice introduce alla Analisi della Conversazione, ne illustra gli aspetti di base, ne mostra le applicazioni alle interazioni comunicative istituzionali e propone una sinergia interdisciplinare a partire da un nucleo sociologico con indicazioni operative e prospettive per…
L'edilizia scolastica: evoluzione di una tipologia attraverso un secolo di storia
2012
L’istituzione scuola è una conquista relativamente recente per la nostra nazione. Fino all’Unità d’Italia infatti l’educazione rimaneva chiusa all’ambito ecclesiastico e privato, assolutamente priva di “luoghi” specifici. Solo alla fine del 1800 si acquisì la consapevolezza dell’importanza del luogo dove insegnare ed imparare ed allora si cominciò a progettare edifici ad hoc. L’evoluzione della progettazione della scuola, in particolare quella elementare, ha visto negli anni un sempre più complesso intreccio tra discipline, normative e soluzioni progettuali, con un percorso particolarmente significativo attraverso lo sviluppo delle tecniche costruttive, dagli edifici in muratura della fine …
L'efficienza delle mercato delle scommesse sportive a quota fissa: un analisi empirica
2016
Il miglioramento delle performance energetiche nella civile abitazione: analisi tecnico-economica di un caso studio
2009
An Advanced Numerical Model in Solving Thin-Wire Integral Equations by Using Semi-Orthogonal Compactly Supported Spline Wavelets
2003
Abstract—In this paper, the semi-orthogonal compactly sup- ported spline wavelets are used as basis functions for the efficient solution of the thin-wire electric field integral equation (EFIE) in frequency domain. The method of moments (MoM) is used via the Galerkin procedure. Conventional MoM directly applied to the EFIE, leads to dense matrix which often becomes computation- ally intractable when large-scale problems are approached. To overcome these difficulties, wavelets can be used as a basis set so obtaining the generation of a sparse matrix; this is due to the local supports and the vanishing moments properties of the wavelets. In the paper, this technique is applied to analyze elec…
An advanced numerical treatment of EM absorption in human tissue
2020
The numerical computation of local electromagnetic absorption at points within the human tissue is proposed by avoiding the mesh generation in the problem domain. Recently, meshless numerical methods have been introduced as an alter- native computational approach to mesh based methods. This is an important feature to generate competitive procedure able to provide final evaluations for large data amounts in real time. In this paper the smoothed particle hydrodynamics method is considered to compute the electromagnetic absorption. First experiments are performed in two dimension at single frequencies by considering incident TM plane wave on 2D cylinder simulating a simplified model of human t…
Improved fast Gauss transform for meshfree electromagnetic transients simulations
2019
Abstract In this paper improved fast summations are introduced to enhance a meshfree solver for the evolution of the electromagnetic fields over time. The original method discretizes the time-domain Maxwell’s curl equations via Smoothed Particle Hydrodynamics requiring many summations on the first derivatives of the kernel function and field vectors at each time step. The improved fast Gauss transform is properly adopted picking up the computational cost and the memory requirement at an acceptable level preserving the accuracy of the computation. Numerical simulations in two-dimensional domains are discussed giving evidence of improvements in the computation compared to the standard formula…
An augmented MFS approach for brain activity reconstruction
2017
Abstract Weak electrical currents in the brain flow as a consequence of acquisition, processing and transmission of information by neurons, giving rise to electric and magnetic fields, which can be modeled by the quasi-stationary approximation of Maxwell’s equations. Electroencephalography (EEG) and magnetoencephalography (MEG) techniques allow for reconstructing the cerebral electrical currents and thus investigating the neuronal activity in the human brain in a non-invasive way. This is a typical electromagnetic inverse problem which can be addressed in two stages. In the first one a physical and geometrical representation of the head is used to find the relation between a given source mo…
A Smoothed Particle Interpolation Scheme for Transient Electromagnetic Simulation
2006
In this paper, the fundamentals of a mesh-free particle numerical method for electromagnetic transient simulation are presented. The smoothed particle interpolation methodology is used by considering the particles as interpolation points in which the electromagnetic field components are computed. The particles can be arbitrarily placed in the problem domain: No regular grid, nor connectivity laws among the particles, have to be initially stated. Thus, the particles can be thickened only in distinct confined areas, where the electromagnetic field rapidly varies or in those regions in which objects of complex shape have to be simulated. Maxwell’s equations with the assigned boundary and initi…