188,018 research outputs found
Biological pattern formation with cellular neural networks
No full textThe ability of the conventional, simple Cellular Neural Network (CNN) model to form spatial and spatio-temporal patterns has been recently highlighted [1, 2]. This paper continues this investigation, by studying new properties of pattern formation, and their application to modeling of biological pattern forming systems
Lo stress lavoro-correlato presso l’Università degli Studi di Pavia: valutazione oggettiva e soggettiva
No full textIndagine Sperimentale sulla Duttilità dei Setti di Controvento in Scala Reale Sottoposti a Carichi Ciclici
No full textIl lavoro affronta lo studio della duttilità dei setti di controvento antisismici in calcestruzzo armato. Il comportamento dei setti nel campo di spostamenti oltre il limite elastico pone ancora dei problemi, in particolare dovuti all’incertezza relativa alla loro duttilità. Recenti lavori sperimentali hanno infatti messo in evidenza il rischio di una crisi per taglio alla base dei setti che può penalizzare fortemente la loro capacità di spostamento. Nel presente lavoro sono riportati i risultati più significativi di una prova sperimentale, a scala reale, su un setto di controvento dimensionato per un edificio di cinque piani, sottoposto a carichi orizzontali ciclici. Nel lavoro sperimentale il problema della limitata duttilità flessionale dovuta al taglio è stato risolto adottando armature di grosso diametro uniformemente distribuite lungo l’intera sezione. Il setto di indagine ha raggiunto una duttilità in termini di spostamento superiore a sei, con un drift massimo del 2,5%, senza decadimento di resistenza e senza significativi fenomeni di scorrimento nella zona critica di base. La prova ha permesso di valutare l’estensione della regione a comportamento plastico e di dare indicazioni sulla lunghezza della cerniera plastica equivalente. Accanto ai risultati sperimentali sono riportate alcune semplici formulazioni analitiche che, avvalorate dal confronto con i dati sperimentali, possono costituire un primo riferimento per la valutazione delle caratteristiche necessarie per le verifiche sismiche, quali la capacità di spostamento, la duttilità e la resistenza ultima del setto rispetto a quella di inizio di snervamento
An approach to information propagation in 1-D cellular neural networks - Part II: Global propagation
No full textThis second of two papers [1] studies how and when a global propagation of information, introduced as initial condition, is possible through a one-dimensional (1-D) Cellular Neural Network (CNN) with connections between nearest neighbors only. We will focus on circular arrays, which have the most regular structure, we will show that periodic solutions exist, and we will compute one of them analytically. We will also study their stability. © 1998 IEEE
Mindfulness and psychosomatic well-being among firefighters: a mediational model
No full textAs a consequence of the exposure to potentially traumatic events, firefighters are at high risk to develop traumatic stress reactions (Wagner et al., 2010) and psychosomatic effects, such as emotional strain and feelings of hyper-arousal (Beaton & Murphy, 1993). But, as demonstrated by the Job Demands-Resources model (JD-R; Bakker et al., 2003; Demerouti et al., 2001), every occupation has both job demands and job resources, that reduce job demands and the related costs. In this view, in addition to job demands and their associated negative effects, firefighters have also psychological resources at their disposal. An example is represented by mindfulness, that is the ability to pay attention to and to be aware of the current experience (Brown & Ryan, 2003; Kabat-Zinn, 1990). It has been widely demonstrated that mindfulness may influence levels of physic-physical well-being (Kabat-Zinn, 1990; Shapiro et al., 1998).
This study aims to test a new process underlying the negative relationship between mindfulness and psychosomatic malaise. In particular, we proposed that intrusion predicts symptoms of general dysphoria in response to mindfulness.
The sample consisted of 255 Italian firefighters (both professional and volunteer). Self-report measures were used to assess mindfulness (MAAS; Brown & Ryan, 2003), psychosomatic symptoms (GHQ-12; Goldberg & Williams, 1988) and post-traumatic manifestations (STSS-It; Setti & Argentero, 2012).
Data were analyzed using structural equation modelling. Mindfulness did not directly influence general dysphoria whereas mediation analyses revealed its meaningful indirect effect via intrusion (standardized indirect effect = -.041**). According to our results, mindfulness leads to reduced symptoms of general dysphoria through low levels of intrusive thoughts.
From a theoretical perspective, to our knowledge this is one of the first studies focused on the protective role of mindfulness against the risk of developing psychosomatic malaise via post-traumatic manifestations. From a practical point of view, our results suggest the importance to implement interventions based on the reduction of post-traumatic symptoms, on the one hand, and on the enhancement of mindfulness, on the other hand. Through these strategies, people could learn to regulate distressing thoughts and feelings that occur in response to stressful events
ORAL CONTRIBUTION - “The photovoltaic Condominium: a concrete opportunity for Local Administrations for reaching the Kyoto Protocol Objetctives through an economically sustainable management of photovoltaic plants” - PRESENTING AUTHOR
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