1,258 research outputs found
Shape and size in medicine, biotechnology, materials science and social sciences
No full textThis special issue gathers together papers presented during the workshop Shape and Size in Medicine, Biotechnology, Materials Science and Social Sciences, Milano, Italy, 16-17 February 201
Big data e privacy by design. Anonimizzazione, pseudonimizzazione, sicurezza. Con Contenuto digitale per download e accesso on line
No full textPainter Filippo Naldi (II)
No full textSlikar Filippo Naldi bio je prema vlastitom iskazu podrijetlom iz Firence. U službi mletačke vojske živio je i djelovao u Dalmaciji sredinom 18. stoljeća. Spominje se u Opuzenu gdje je bio upravitelj luke. Naldi je na širem dalmatinskom prostoru izradio velik broj slika vjerskoga sadržaja te nekoliko portreta. Ovom prigodom pripisuje mu se sedam slika u crkvama Dalmatinske zagore i u Poljicima (Zavojane kraj Vrgorca, Dobranje kraj Imotskoga, Kostanje u Poljicima, Čaporice kraj Trilja i Franjevački samostan u Sinju). Autor analizira odlike
Naldijeva slikarstva i njegovo značenje u dalmatinskoj umjetnosti i društvu 18. stoljeća.According to his own testimony, the painter Filippo Naldi was of Florentine origin. He lived and worked in Dalmatia in the mid-eighteenth century while serving in the Venetian army. He was mentioned in records as a port manager at Opuzen. In the wider Dalmatian area, Naldi painted a large number of religious works and several portraits. This paper attributes to him seven paintings in churches situated in the Dalmatian hinterland and the region of Poljica (at Zavojane near Vrgorac, Dobranje near Imotski, Kostanje at Poljica, Čaporice near Trilj and in the Franciscan monastery at Sinj). The author analyzes the characteristics of Naldi’s painting and his significance in eighteenth-century Dalmatian art and society
Il Benessere Bambino: riscrittura e continuazione
No full textIl capitolo ripercorre l’anima del volume Benessere Bambino del 2010, evocando in forma antologica alcuni passaggi fondamentali che evidenziano i significati del Benessere Bambino in relazione all’ambito familiare, a quello istituzionale e al contesto socio-culturale. Per ciascuno di questi ambiti, saranno richiamati sia gli aspetti che possono incentivare il Benessere Bambino, sia quei fattori che possono invece costituire fonte di disagio e di potenziale abuso e/o maltrattamento
A chemo-mechanical model for the single myofibril in striated muscle contraction
No full textBased on the framework of sliding-filament theory and on the cross-bridges dynamics, a mathematical model for the simulation of the force response and length change of individual myofibril is presented. The myofibril is modeled as a group of segments placed in series, each segment represents a half-sarcomere with active and elastic properties. A multiple-state cross-bridge formalism relates the half Sarcomere force to the chemical kinetics of ATP hydrolysis. The corresponding system of nonlinear nonlocal partial differential equations of the model is analyzed. A numerical approach is introduced and some numerical tests are performed. The proposed in-silico model enables the study of biologically relevant process in the muscle contraction process, also in the case of muscular diseases, with reasonable computational effort
Mathematics and physics applications in sociodynamics simulation: the case of opinion formation and diffusion
No full textIn this chapter, we briefly review some opinion dynamics models starting from the classical Schelling model and other agent-based modelling examples. We consider both discrete and continuous models and we briefly describe different approaches: discrete dynamical systems and agent-based models, partial differential equations based models, kinetic framework. We also synthesized some comparisons between different methods with the main references in order to further analysis and remarks
Possiamo sentire la forma di un grafo? Un grafo può farci sentire la forma dei dati? I parte = Can we feel the shape of a graph? Can a graph make us feel the shape of data? Part I
No full textSistemi composti da elementi discreti che presentano interazioni binarie appaiono in vari ambiti scientifici e tecnologici. La struttura matematica naturale per studiare e rappresentare tali sistemi è quella di grafo in cui gli elementi sono detti vertici (nodi) mentre le interazioni lati (o archi). Di interesse sono anche i modelli che rappresentano processi dinamici su un grafo e in cui si associa ad ogni lato e/o vertice equazioni o operatori differenziali. In tal caso, per capire il comportamento dell'intero sistema è importante comprendere sia la dinamica dei singoli elementi sia la struttura sottostante. In questo articolo (diviso in due parti) considereremo due problemi particolari: il primo consiste nella ricostruzione della topologia di un grafo (sia nel caso statico sia nel caso dinamico); il secondo riguarda la possibilità di estrarre informazioni su un insieme di dati partendo dalle proprietà di un grafo che li rappresenti.Systems composed of discrete elements that present binary interactions appear in various scientific and technological areas. The natural mathematical structure for studying,and representing,these systems is that of a graph in which the elements are called vertices (nodes) while the interactions/edges/arcs. We are also interested in models that represent dynamic processes on a graph and in which differential equations or operators are associated with each edge and/or vertex. To understand the behavior of the whole system,it is important to understand both the dynamics of the individual elements and the underlying structure. In this article (divided into two parts) we will consider two particular problems: the first one consists in the reconstruction of the topology of a graph (both in the static and in the dynamic case); the second concerns the possibility of extracting information on a data set starting from the properties of a graph that represents them
A journey through multiscale, some episodes from approximation and modelling
No full textThe present notes contains both a survey of and some novelties about mathematical problems which emerged in multiscale based approach in approximation of evolutionary partial differential equations. Specifically, we present a relaxed systems approximation for nonlinear diffusion problems, which can tackle also the cases of degenerate and strongly degenerate diffusion equations. Relaxation schemes take advantage of the replacement of the original partial differential equation with a semi-linear hyperbolic system of equations, with a stiff source term, tuned by a relaxation parameter ε. When ε→0+, the system relaxes onto the original PDE: in this way, a consistent discretization of the relaxation system for vanishing ε yields a consistent discretization of the original PDE. The advantage of this procedure is that numerical schemes obtained in this fashion do not require to solve implicit nonlinear problems and possess the robustness of upwind discretizations. We also review a unified framework, including BGK-based diffusive relaxation methods and new relaxed numerical schemes. A stability analysis for the new methods is sketched and high order extensions are provided. Finally some numerical tests in one and two dimensions are shown with preliminary results for nonlocal problems and multiscale hyperbolic systems
A new numerical method to determine isothermal g-functions of borehole heat exchanger fields
No full textAn iterative numerical method to determine g-functions of borehole fields with the boundary condition of uniform temperature and time-constant surface-averaged heat flux is proposed. The method employs boundary conditions of uniform time-dependent temperature that converge to time-constant surface-averaged heat flux. Two simulations are sufficient for technical purposes, while additional simulations yield very precise g-functions with the desired boundary condition. The method is applied to analyze the overestimation of the g-function yielded by the condition of uniform and constant heat flux and the effects of the buried depth and of the spacing between boreholes on the g-function, for a 3 × 2 borehole field
New dimension in Biology: two examples of 3D phenomenological models
No full textAlthough computational and experimental models for cell migration and dynamics on two-dimensional (2D) substrata have described how various molecular and cellular properties and biochemical processes are integrated to accomplish cell functions, biologists are increasingly turning to threedimensional cell cultures, where they are discovering biological activities
that more closely mirror what happens in living organisms.
In fact, the in situ environment of a cell in living organism has a threedimensional
architecture. This “new dimension” may represent a challenge
in mathematical and computational modelling in order to better understand
physiological and biochemical processes. We report here two examples regarding
phenomenological description of early stages of vascular network
assembly and, respectively, of olfactory system in embryogenesis
- …
