374 research outputs found
Chi è in/sicuro sul lavoro? Il difficile intreccio tra lavori temporanei e cultura della sicurezza
No full textL’articolo mira a comprendere in qual modo il lavoro temporaneo porti a riconfigurare i processi di costruzione dell’in/sicurezza nei luoghi di lavoro. A questo scopo il contributo si sofferma su alcune delle interviste svolte nell’ambito di una ricerca inerente le relazioni tra condizioni di sicurezza e lavoro temporaneo nei settori della cura e della ristorazione. Viene in primo luogo messo in evidenza il fatto che ad impedire l’apprendimento di modi di lavorare sicuri sia l’intrecciarsi della temporaneità contrattuale con altri elementi di vulnerabilità, quali ad esempio lo scarso livello di esperienza o la condizione di migrante. In secondo luogo, l’articolo mostra come quest’insieme di elementi porti i soggetti che lavorano con contratti a termine a dover apprendere come muoversi all’interno di ambienti in/ sicuri, facendosi dunque carico dei costi della sicurezza, o addirittura a dover trascurare del tutto la propria salute lavorativa, delineando, quindi, delle vere e proprie "carriere vulnerabili"
Continuous and discontinuous phase transitions in the evolution of a polygenic trait under stabilizing selective pressure
No full textThe presence of phenomena analogous to phase transition in Statistical Mechanics has been suggested in the evolution of a polygenic trait under stabilizing selection, mutation and genetic drift. By using numerical simulations of a model system, we analyze the evolution of a population of N diploid hermaphrodites in random mating regime. The population evolves under the effect of drift, selective pressure in form of viability on an additive polygenic trait, and mutation. The analysis allows to determine a phase diagram in the plane of mutation rate and strength of selection. The involved pattern of phase transitions is characterized by a line of critical points for weak selective pressure (smaller than a threshold), whereas discontinuous phase transitions, characterized by metastable hysteresis, are observed for strong selective pressure. A finite-size scaling analysis suggests the analogy between our system and the mean-field Ising model for selective pressure approaching the threshold from weaker values. In this framework, the mutation rate, which allows the system to explore the accessible microscopic states, is the parameter controlling the transition from large heterozygosity (disordered phase) to small heterozygosity (ordered one)
Harmonic and interharmonic measurements through a compressed sampling approach
No full textThe paper deals with the distributed monitoring of harmonic and interharmonic pollution in electrical power delivery systems. In order to measure the disturbances and to identify the sources in a wide grid, a distributed measurement system with hundreds of measurement nodes has to be adopted. With the aim of obtaining the reduction of realization costs, the authors propose an innovative distributed architecture, based on cost-effective nodes, that takes advantage from the compressive sampling strategy. Differently from traditional approach, the network nodes will be only mandated to acquire and to digitize the line voltage directly in a compressed form, whereas a central measurement unit will receive data from all nodes deployed in the grid and will perform the successive signal reconstruction, making possible the use of low-performance hardware to realize them. The assessment of the compliance of the proposed measurement technique with the current power quality standards turns out to be mandatory, thus verifying the absence of artifacts introduced by the adopted compressed sampling approach. © 2015 Elsevier Ltd. All rights reserved
Random mutants of a Pleurotus ostreatus laccase as new biocatalysts for industrial effluents bioremediation
No full textAims: To select better performing laccase variants among the 2300 randomly mutated variants of Pleurotus ostreatus POXA1b laccase to develop improved laccase-based biocatalysts. Methods and Results: Screening of collections of 2300 randomly mutated variants of POXA1b was performed by assaying activity towards the phenolic substrate 2,6-dimethoxyphenol. Two new variants endowed with higher enzyme activity than the wild-type laccase were characterized, and their ability to decolourize industrial dyes with complex trisazo-, polyazo- and stilbene-type structures, in the absence of mediators, was demonstrated. One of the mutants (2L4A) was also proved to be highly stable at both acidic and alkaline pH values (displaying a half-life of around 1 month at the pH levels of both 5 and 10). Conclusions: In comparison with the wild-type laccase, the new selected 2L4A mutant shows a significant increase in stability at acidic pH, whilst storing its high stability at alkaline pH. This variant also represents a more versatile enzyme with respect to both the variety of xenobiotics degraded and the operative conditions. Significance and Impact of the Study: This work represents the first example of improvement of a basidiomycete laccase for industrial effluents bioremediation by directed evolution
A Compressed Sampling-Based Method Compliant with IEC 61000-4-30 for Harmonic and Interharmonic Measurements
No full textThe paper deals with the problem of measuring harmonic and interharmonic pollution in electrical power delivery systems. The attention is specifically focused on the possibility of exploiting the compressed sampling in order to implement cost-effective nodes for distributed acquisition of the voltage signals. Differently from the traditional distributed measurement systems, the proposed
approach should allow a dramatic cost reduction of the monitoring network. According to the compressed sampling protocol, the operations of distributed nodes will, in fact, be limited to random digitization and transmission of few samples for each voltage line; no high performance architectures should, thus, be necessary, with a consequent money saving. Assessing the compliance of the achieved measurements with the current standards turns out to be mandatory, thus verifying the absence of artifacts introduced by the adopted compressed sampling approach.
Results obtained in numerical and experimental tests
have highlight the promising performance of the proposed approach, thus suggesting its implementation in an actual measurement instrument
Tracking the sociomaterial traces of affect at the crossroads of affect and practice theories
No full textPurpose Affect is relevant for organization studies mainly for its potential to reveal the intensities and forces of everyday organizational experiences that may pass unnoticed or pass in silence because they have been discarded from the orthodoxy of doing research “as usual.” The paper is constructed around two questions: what does affect “do” in a situated practice, and what does the study of affect contribute to practice-based studies. This paper aims to discuss these issues. Design/methodology/approach The authors chose a situated practice – interviewing – focusing on the dynamic character of the intra-actions among its heterogeneous elements. What happens to us, as persons and researchers, when we put ourselves inside the practices we study? The authors tracked the sociomaterial traces left by affect in the transcript of the interviews, in the sounds of the voices, in the body of the interviewers, and in the collective memories, separating and mixing them like in a mixing console. Findings The reconstruction, in a non-representational text, of two episodes related to a work accident makes visible and communicable how affect circulates within a situated practice, and how it stiches all the practice elements together. The two episodes point to different aspects of the agency of affect: the first performs the resonance of boundaryless bodies, and the second performs the transformative power of affect in changing a situation. Originality/value The turn to affect and the turn to practice have in a common interest in the body, and together they contribute to re-opening the discussion on embodiment, embodied knowledge, and epistemic practices. Moreover, we suggest an inventive methodology for studying and writing affect in organization studies
"Si tout sujet est portrait” : figurations du moi dans Le Monde désert de Jouve et La Mort difficile de Crevel
No full textThe analysis of two novels from the 1920s selected as emblematic cases – Le Monde désert by Jouve and La Mort difficile by Crevel – leads the author to point out the connections between the figuration of the subject in literature and the portrait in painting. Indeed, the survival of the portrait itself as a pictorial genre can be seen as a sign of its involvement in the enquiry of identity and subjectivity. This article describes the three main axes that organise subjectivity as a portrait: the fluctuation between stasis and movement, the relational dimension and the fictional one. The portrait becomes the ideal model of a subject conceived as the result of a creative process. Hence, painting is not to be considered a mere narrative theme but a key to the interpretation of the novels and a metaphor of the construction of the subject
«Una strania fenice». Marco Santagata: gli studi, le opere
No full textIl libro raccoglie contributi sulla figura e le opere di Marco Santagata, italianista e scrittore. Ne sono autori Annalisa Andreoni, Gian Mario Anselmi, Gabriele Baldassari, Roberto Barbolini, Pietro G. Beltrami, Claudia Berra, Alberto Bertoni, Laura Bosio, Cristiana Brunelli, Alberto Casadei, Roberta Cella, Michele Feo, Francesco Ferretti, Gianfranco Fioravanti, Serena Fornasiero, Christian Genetelli, Klaus W. Hempfer, Giuseppe Indizio, Vincenzo Manca, Grazia Melli, Cristina Montagnani, Matteo Palumbo, Laura Paolino, Diego Quaglioni, Amedeo Quondam, Gerhard Regn, Laura Regnicoli, Francisco Rico, Raffaele Ruggiero, Gino Ruozzi, Salvatore Settis, Silvana Tamiozzo, Chiara Tognarelli, Paola Vecchi Galli, Tiziano Zanato. Chiude il volume la Bibliografia degli scritti di Marco Santagata.
Marco Santagata (Zocca, 28 aprile 1947 ‒ Pisa, 9 novembre 2020) è stato studioso di letteratura italiana e romanziere. A lungo docente all’Università di Pisa, è autore di studi fondamentali su Petrarca – culminati nel commento al Canzoniere (1996, 20042) –, su Dante, Boccaccio, la poesia del Quattrocento e Boiardo, e sulla tradizione lirica fino a Leopardi, Pascoli e d’Annunzio. A ciò ha affiancato una felice produzione narrativa: tra i suoi romanzi Il copista (2000), Il maestro dei santi pallidi (2002, Premio Campiello 2003), L'amore in sé (2006, Premio Stresa), Come donna innamorata (2015, finalista al Premio Strega). La sua poliedrica natura di intellettuale impegnato e curioso del mondo lo ha portato anche ad occuparsi attivamente di politica culturale e universitaria e di divulgazione.The book collects contributions on the figure and works of Marco Santagata, scholar of Italian literature and novelist. The authors are Annalisa Andreoni, Gian Mario Anselmi, Gabriele Baldassari, Roberto Barbolini, Pietro G. Beltrami, Claudia Berra, Alberto Bertoni, Laura Bosio, Cristiana Brunelli, Alberto Casadei, Roberta Cella, Michele Feo, Francesco Ferretti, Gianfranco Fioravanti, Serena Fornasiero, Christian Genetelli, Klaus W. Hempfer, Giuseppe Indizio, Vincenzo Manca, Grazia Melli, Cristina Montagnani, Matteo Palumbo, Laura Paolino, Diego Quaglioni, Amedeo Quondam, Gerhard Regn, Laura Regnicoli, Francisco Rico, Raffaele Ruggiero, Gino Ruozzi, Salvatore Settis, Silvana Tamiozzo, Chiara Tognarelli, Paola Vecchi Galli, Tiziano Zanato. The volume closes with the Bibliography of Marco Santagata's writings.
Marco Santagata (Zocca (Modena), 28 April 1947 ‒ Pisa, 9 November 2020) was a scholar of Italian literature and novelist. Long a professor at the University of Pisa, he is the author of fundamental studies on Petrarch - culminating in the commentary on the "Canzoniere" (1996, 20042) -, on Dante, Boccaccio, fifteenth-century poetry and Boiardo, and on the lyric tradition up to Leopardi, Pascoli and d'Annunzio. Alongside this he has a successful narrative production: among his novels "Il copista" (2000), "Il maestro dei santi pallidi" (2002, Campiello Prize 2003), "L'amore in sé" (2006, Stresa Prize), "Come donna innamorata" (2015, finalist for the Strega Prize). His multifaceted nature as a engaged intellectual has also led him to actively deal with cultural and university politics and dissemination
CORRIGENDUM to The mechanisms of acute interstitial nephritis in the era of immune checkpoint inhibitors in melanoma
No full textIn this article, the authors’ first names and surnames were incorrectly listed in the wrong order. The correct author list is: Marco Tucci, Anna Passarelli, Annalisa Todisco, Francesco Mannavola, Luigia Stefania Stucci, Stella D’Oronzo, Michele Rossini, Marco Taurisano, Loreto Gesualdo and Franco Silvestris
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