1,720,964 research outputs found
NUOVE NORME PER LA MITIGAZIONE E LO STUDIO DELL’IMPATTO DEGLI AIRGUN SUI MAMMIFERI MARINI
Full text linkLo studio dell'impatto dei survey sismici in mare sui mammiferi marini è ancora frammentario e incompleto, mancando
un’osservazione degli effetti a lungo termine sulle popolazioni. Nel 2015 l’Italia ha introdotto l’obbligo di condurre survey di studio
acustico e visivo sui mammiferi marini presenti nell'area di prospezione almeno per 60 giorni antecedenti la stessa, e per altrettanti
60 giorni successivi alla stessa. I dati raccolti contribuiranno a colmare il gap conoscitivo e a perfezionare i protocolli
operativi finalizzati alla protezione dei mammiferi marini
IL REGISTRO NAZIONALE DELLE SORGENTI DI RUMORE IMPULSIVO NELLA IMPLEMENTAZIONE DELLA MARINE STRATEGY
Full text linkLa Direttiva Europea sulla Strategia Marina (MSFD 2008/56/EC) riconosce il rumore come elemento negativo per la qualità
dell'ambiente marino e identifica due principali categorie, il rumore impulsivo (localizzato e limitato nel tempo) e il rumore continuo
a bassa frequenza (soprattutto dovuto al traffico navale). La Direttiva richiede l’istituzione di un registro nazionale delle sorgenti
impulsive e l’Università di Pavia, con CNR e CONISMA, è stata incaricata di implementare e gestire tale registro con una
struttura aperta a futuri sviluppi di ricerca e di condivisione internazionale
Modelli di previsione della propagazione sonora in ambiente marino per il monitoraggio del rumore subacqueo e del suo impatto sui cetacei.
Full text linkOcean Noise Map é una tecnologia innovativa che é stata utilizzata per ottenere stime di rumore marino generato da traffico navale nel Santuario Pelagos su un periodo test di 3 giorni (20-22 gennaio 2017). 136 mappe sono state prodotte con una cadenza di 30 minuti per la banda di un terzo d’ottava centrata a 21 Hz, al fine di mostrare l’insonificazione generata dalle navi e valutare il possibile mascheramento dello spazio di comunicazione delle balonettere comuni (Balaenoptera physalus)
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
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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