1,720,961 research outputs found
Approcci aziendali alla sicurezza ed effetti sulle percezioni dei lavoratori: uno studio empirico
No full textEmployer’s approach to safety management can significantly affect both employees’ perceptions and behaviors. Approaches of 17 employers were analyzed and compared with employees’ safety perceptions. Results indicate a tight relationship between the two aspects: particularly, high safety commitment is associated with better safety climate. Practical implications are discussed in the conclusions
Effects of irrigation on growth and yield components of hazelnut (Corylus avellana L.) in Central Italy
No full textLong term evaluation of hazelnut response to irrigation is important in areas with limited water availability. Drought conditions are becoming common in the regions of Central Italy, such as Latium, which is the second area of hazelnut production in Italy. The trial examined from 2005 to 2007 the response of adult plants of cultivars Tonda Gentile Romana, Tonda di Giffoni and Nocchione to different levels of irrigation in the experimental orchard established in 1992 at the Experimental farm of University of Tuscia. Three volumes of irrigation corresponding to the restitution of 50, 75, 100 % ETc calculated from class A evaporation were applied by means of drip irrigation and compared with the un-irrigated control. Vegetative growth (trunk cross-sectional area and crown volume) and yield components were positively affected by irrigation. The highest plant yield was obtained at the 75 % ETc for all cultivars and years. Nut and kernel weight and size were slightly greater in irrigated than in control plants. The percentage of empty and defected nuts was higher in condition of limited water availability. The oil content in the kernel of TGR and Nocchione was slightly higher in 75 % and 100 % ETc than in the other treatments. In conclusion, water supply of 75 % ETc could be valid irrigation levels for hazelnut cvs. Tonda Gentile Romana, Tonda di Giffoni and Nocchione in areas characterized by insufficient rainfalls during the year
Caratterizzazione e valutazione del germoplasma del pero dell’Alto Molise
No full textLa lunga tradizione della coltura delle pomacee nel Molise ha stimolato un’attività di recupero, valutazione e conservazione del germoplasma del pero in provincia di Isernia. Sono state reperite ventisette varietà antiche, che sono state introdotte in collezione presso l’Università della Tuscia (Viterbo). Osservazioni pluriennali sulle caratteristiche pomologiche, qualitative e fenologiche hanno evidenziato un’ampia variabilità di epoche di maturazione di raccolta (da giugno, per Raiole, a novembre, per Pera di Natale), di forma (da maliforme-appiattita ad allungata) e di usi (in aceto, sovramature, cotte, essiccate). Alcune varietà possono rivestire un buon interesse come frutticole ornamentali, per il colore e l'abbondanza della fruttificazione (Rosciole) o per la particolare forma del frutto (Zuccherina, Lattazzero, Tonda piatta)
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Validazione italiana di una scala breve per la misura del Clima di sicurezza lavorativa
No full textL’interesse per il clima di sicurezza che caratterizza le organizzazioni è notevolmente aumentato nell’ultimo decennio e la valutazione del clima è rilevante per le organizzazioni lavorative. Le scale di misura sono solitamente multi-dimensionali e con elevato numero di domande, rendendo le misurazioni complesse e costose per le organizzazioni stesse. Hahn e Murphy hanno sviluppato una misura sintetica a sei item del clima, facilmente ed economicamente utilizzabile nei contesti di lavoro.
L’obiettivo dello studio è di validare la versione italiana dello strumento valutando la struttura fattoriale, la validità interna (coefficiente α di Cronbach), di criterio (correlazione positiva con variabili collegate al clima) e discriminante (correlazioni deboli o assenti con variabili indipendenti dal clima).
La versione italiana è stata predisposta attraverso una procedura di back translation e utilizzata in 342 lavoratori di 17 organizzazioni operanti in diversi settori produttivi. In linea con Hahn e Murphy il questionario ha compreso la misurazione di variabili demografiche (età, genere, anzianità lavorativa e ore lavorate, utilizzate per valutare la validità discriminate), di problemi legati al sonno (validità discriminate) e di condizioni ambientali, prestazione sicura e presenza di procedure di sicurezza (per la valutazione della validità di criterio).
L’analisi fattoriale confermativa mostra eccellenti coefficienti di adattamento e la scala evidenzia una buona validità interna. L’analisi delle correlazioni conferma fortemente la validità di criterio e quella discriminante.
I risultati ottenuti confermano la validità della scala breve di clima che può essere utilizzata anche nel contesto italiano
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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