726 research outputs found
Le incontenibili proliferazioni di Incerti
No full textMostra Achille Incerti, a cura di Elisabetta Fagioli e Egle Prati, Reggio Emilia, Chiostri di S. Domenico, 24 nov. 2007 – 7 gennaio 200
Banks and Capitalists in Florence in the Decades after Unification
No full textThe paper examines some aspects of the Tuscan banking system, emphasising the duality between the private banking system and the issuing banks. It considers both the different methods of managing credit and investments, and the transformation of the banking sector which emerged in the aftermath of unification of Italy and the transfer of the capital to Florence. Marco Cini uses as a case study the Banca Nazionale Toscana, established shortly after unification (1857). He examines, on the one hand, the relationships with the important Tuscan landowners and the Florentine financial system, which came to be associated with forms of speculation, especially in the construction field, when the capital was moved to Florence. On the other hand, he explores the theme of monetary emission and relationships with the issuing banks and the new state power. Simone Fagioli examines the activities of two private banks, Banco Fenzi and Banco Schmitz & Turri, using previously unpublished archive material. During the early years of unification, the management of these banks was still closely intertwined with the local political system. Fagioli analyses both what could be termed their "pure" banking activities and the areas and models of investment in industrial sectors (metallurgy, textiles and mining)
Attenzione ed esperienza estetica nella comunicazione didattica: studi empirici per il superamento dello svantaggio socio-culturale nella scuola secondaria
No full textLa sperimentazione, condotta nella scuola secondaria, ha avuto lo scopo di rilevare l’effetto dell’intervento didattico orientato esteticamente, sui li- velli di attenzione e coinvolgimento emotivo positivo (emozione estetica) degli allievi facenti parte di classi dove hanno operano docenti formati al potenziamento estetico del messaggio didattico, in comparazione con classi parallele in cui non è ancora applicata tale didattica innovativa e che quindi svolgono funzione di controllo. Per la formazione dei docenti delle classi sperimentali impegnati per l’anno scolastico 2018-2019 in 4 classi della scuola secondaria di primo e secondo grado, è stata messa a punto una piattaforma online per rendere disponibili video artistici e visite museali virtuali, come integrazione e supporto dei contenuti curricolari. Sono stati somministrati alle classi sperimentali e di controllo, i seguenti strumenti: a) Questionario sull’attenzione in classe (derivato da Mazzocchi, Molin, Poli, 2000); b) Que- stionario sull’esperienza estetica (di Wanzer et al., 2018; adattato in Italia da Mastandrea, Fagioli, Biasi, 2019). Ai docenti è stato somministrato il Que- stionario di metacognizione e attenzione «QMAI» (di Mazzocchi et al., 2000) ed è stato richiesto un “Resoconto sull’Organizzazione delle Lezioni”. L’ar- ricchimento estetico del messaggio didattico operato dai docenti nelle classi sperimentali ha favorito significativamente i processi attentivi ed il coinvol- gimento emotivo positivo dei discenti, aspetti che risultano in letteratur
Correlati neurali delle risposte emozionali evocate dall’apprezzamento estetico e modulazione sul benessere psicofisico
No full textStudi recenti hanno dimostrato che la fruizione di immagini d’arte è in grado di promuovere il benessere psicofisico, inteso in termini di riduzione dello stress e della sintomatologia ansiosa (Mastandrea, Fagioli, & Biasi, 2019). In quest’ottica, l’arte-terapia è stata frequentemente utilizzata quale strumento terapeutico per il trattamento dei disturbi psichiatrici e delle problematiche psicologiche tipiche dell’invecchiamento e delle malattie neurodegenerative, con importanti ricadute sia in ambito clinico che educativo. Ad oggi, tuttavia, le modalità mediante le quali le immagini d’arte regolano i nostri stati emozionali producendo benessere sono ancora poco conosciute. In questo studio abbiamo indagato i meccanismi neurofisiologici che mediano la relazione tra apprezzamento estetico e attivazione di stati emozionali interni, con l’obiettivo ultimo di sviluppare programmi comportamentali ed educativi per la promozione del benessere psicofisico dell’individuo. una serie di recenti modelli teorici ha sostenuto l’ipotesi che l’apprezzamento estetico abbia le sue determinanti in una combinazione complessa e strutturata di stati emozionali biologicamente determinati che rimanda piuttosto a stati affettivi di “ammirazione”, “interesse” o “stupore”. In questo senso, l’emozione estetica può essere considerata una caratterizzazione particolare di una risposta emozionale che può essere definita artespecifica. In questo studio abbiamo esaminato i correlati neurali e comportamentali dell’emozione estetica valutando un’eventuale dissociazione dalle risposte emozionali non-estetiche, per definire con maggiore precisione le determinanti della risposta emozionale arte-specifica e i suoi effetti sul benessere psicofisico
Multiple patterns formation for an aggregation/diffusion predator-prey system
No full textWe investigate existence of stationary solutions to an aggrega-tion/diffusion system of PDEs, modelling a two species predator-prey interac-tion. In the model this interaction is described by non-local potentials that are mutually proportional by a negative constant −α, with α > 0. Each species is also subject to non-local self-attraction forces together with quadratic diffusion effects. The competition between the aforementioned mechanisms produce a rich asymptotic behavior, namely the formation of steady states that are com-posed of multiple bumps, i.e. sums of Barenblatt-type profiles. The existence of such stationary states, under some conditions on the positions of the bumps and the proportionality constant α, is showed for small diffusion, by using the functional version of the Implicit Function Theorem. We complement our results with some numerical simulations, that suggest a large variety in the possible strategies the two species use in order to interact each other
Nonlinear diffusion equations with degenerate fast-decay mobility by coordinate transformation
No full textWe prove an existence and uniqueness result for solutions to nonlinear diffusion equations with degenerate mobility posed on a bounded interval for a certain density u. In case of fast-decay mobilities, namely mobilities functions under an Osgood integrability condition, a suitable coordinate transformation is introduced and a new nonlinear diffusion equation with linear mobility is obtained. We observe that the coordinate transformation induces a mass-preserving scaling on the density and the nonlinearity, described by the original nonlinear mobility, is included in the diffusive process. We show that the rescaled density ρ is the unique weak solution to the nonlinear diffusion equation with linear mobility. Moreover, the results obtained for the density ρ allow us to motivate the aforementioned change of variable and to state the results in terms of the original density u without prescribing any boundary conditions
On gradient flow and entropy solutions for nonlocal transport equations with nonlinear mobility
No full textWe prove the well-posedness of entropy solutions for a wide class of nonlocal transport equations with nonlinear mobility in one spatial dimension. The solution is obtained as the limit of approximations constructed via a deterministic system of interacting particles that exhibits a gradient flow structure. At the same time, we expose a rigorous gradient flow structure for this class of equations in terms of an Energy-Dissipation balance, which we obtain via the asymptotic convergence of functionals.</p
Measure solutions for nonlocal interaction PDEs with two species
No full textThis paper presents a systematic existence and uniqueness theory of weak measure solutions for systems of non-local interaction PDEs with two species, which are the PDE counterpart of systems of deterministic interacting particles with two species. The main motivations behind those models arise in cell biology, pedestrian movements, and opinion formation. In case of symmetrizable systems (i.e. with cross-interaction potentials one multiple of the other), we provide a complete existence and uniqueness theory within (a suitable generalization of) the Wasserstein gradient flow theory in Ambrosio et al (2008 Gradient Flows in Metric Spaces and in the Space of Probability Measures (Lectures in Mathematics ETH Zürich) 2nd edn (Basel: Birkhäuser)) and Carrillo et al (2011 Duke Math. J. 156 229-71), which allows the consideration of interaction potentials with a discontinuous gradient at the origin. In the general case of non-symmetrizable systems, we provide an existence result for measure solutions which uses a semi-implicit version of the Jordan-Kinderlehrer- Otto (JKO) scheme (Jordan et al 1998 SIAM J. Math. Anal. 29 1-17), which holds in a reasonable non-smooth setting for the interaction potentials. Uniqueness in the non-symmetrizable case is proven for C2 potentials using a variant of the method of characteristic
Hippocampal multimodal structural changes and subclinical depression in healthy individuals
No full textSeveral neuroimaging studies report reduced hippocampal volume in depressed patients. However, it is still unclear if hippocampal changes in healthy individuals can be considered a risk factor for progression to clinical depression. Here, we investigated subclinical depression and its hippocampal correlates in a non-clinical sample of healthy individuals, with particular regard to gender differences
Nonlinear degenerate cross-diffusion systems with nonlocal interaction
No full textWe investigate a class of systems of partial differential equations with nonlinear cross-diffusion and nonlocal interactions, which are of interest in several contexts in social sciences, finance, biology, and real world applications. Assuming a uniform âcoercivenessâ assumption on the diffusion part, which allows to consider a large class of systems with degenerate cross-diffusion (i.e. of porous medium type) and relaxes sets of assumptions previously considered in the literature, we prove global-in-time existence of weak solutions by means of a semi-implicit version of the JordanâKinderlehrerâOtto scheme. Our approach allows to consider nonlocal interaction terms not necessarily yielding a formal gradient flow structure
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