1,720,999 research outputs found
Weyl fermions in a non-abelian gauge background and trace anomalies
Full text linkWe study the trace and chiral anomalies of Weyl fermions in a non-abelian gauge background in four dimensions. Using a Pauli-Villars regularization we identify the trace anomaly, proving that it can be cast in a gauge invariant form, even in the presence of the non-abelian chiral anomaly, that we rederive to check the consistency of our methods. In particular, we find that the trace anomaly does not contain any parity-odd topological contribution, whose presence has been debated in the recent literature
Axial gravity and anomalies of fermions
Full text linkWe consider a Dirac fermion in a metric-axial-tensor (MAT) background. By regulating it with Pauli-Villars fields we analyze and compute its full anomaly structure. Appropriate limits of the MAT background allows to recover the anomalies of Dirac and Weyl fermions in the usual curved spacetime, obtaining in particular the trace anomaly of a chiral fermion, which has been the object of recent analyses
On the trace anomaly of a Weyl fermion in a gauge background
Full text linkAbstract We study the trace anomaly of a Weyl fermion in an abelian gauge background. Although the presence of the chiral anomaly implies a breakdown of gauge invariance, we find that the trace anomaly can be cast in a gauge invariant form. In particular, we find that it does not contain any odd-parity contribution proportional to the Chern–Pontryagin density, which would be allowed by the consistency conditions. We perform our calculations using Pauli–Villars regularization and heat kernel methods. The issue is analogous to the one recently discussed in the literature about the trace anomaly of a Weyl fermion in curved backgrounds
Workplace physical aggressions in italy and emilia romagna region
No full textBackground: Workplace physical aggressions determine severe consequences for people and organizations. Previous studies reported their spread in organizations and described factors related to their occurrence (e.g. aggressor within/ outside the organization, type of activity, etc.). However, such data are not available in the Italian work contexts, limiting the possibility of intervention. Objectives: This study aims to provide a description of workplace physical aggressions in the Italian context and the Emilia-Romagna region, considering the main variables described in the literature. Methods: We used data available from the "Flussi informativi" database, containing national data provided by INAIL (National Institute for Insurance against Accidents at Work), which concern all injuries, occupational illness and insured companies’ information, from 2000 to 2018. Information about aggressions in the workplace in Italy and Emilia-Romagna are derived from a subset of these data, coded according to ESAW (European Statistics for Accidents at Work) requirements. The number of events per year per 100,000 estimated insured employees by INAIL is considered as an indicator. Results: In the period 2014-2018, 23,084 injures from aggression were registered in Italy (an average of 28.7 events per 100,000 employees) and 2,308 in Emilia Romagna (30.2). Aggressions by people outside the organization accounted for 85.14 % in Italy and 87.87 % in Emilia-Romagna region. “Health and social services”, “Offices and other activities” and “Transportation” were the sectors that showed the highest numbers of events and rates. Furthermore, we reported detailed results about the variation of the events between professions, the site and nature of the lesion and gravity of events. Discussion: The study provides a description of workplace physical aggressions in the Italian context and we discuss the implication of these results for primary, secondary and tertiary prevention strategies of intervention
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
I Management Standards per la gestione dei rischi psicosociali e prima validazione italiana dell'Indicator Tool
No full textIl metodo Management Standards, dell’ente inglese HSE, è tra quelli utilizzabili per l’attività di gestione dei rischi psicosociali, prevista dal D.Lgs. 81/08. Esso si fonda su due aspetti: la definizione di Standard per i fattori psicosociali; il questionario Indicator Tool (IT), che valuta la prestazione di un’organizzazione rispetto agli standard di riferimento.
L’obiettivo di questo studio è di presentare brevemente il metodo e proporre una prima versione italiana dell’IT, valutandone le caratteristiche psicometriche e la struttura fattoriale.
Il questionario a 35 item è stato somministrato a 1298 lavoratori di 45 aziende.
I risultati avvalorano la struttura fattoriale della versione inglese e mostrano buoni indici di affidabilità delle scale, anche se si evidenziano alcuni punti di criticità, che vengono discussi
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