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Long-Term Monitoring of Dolphin Biosonar Activity in Deep Pelagic Waters of the Mediterranean Sea
No full textDolphins emit short ultrasonic pulses (clicks) to acquire information about the surrounding environment, prey and habitat features. We investigated Delphinidae activity over multiple temporal scales through the detection of their echolocation clicks, using long-term Passive Acoustic Monitoring (PAM). The Istituto Nazionale di Fisica Nucleare operates multidisciplinary seafloor observatories in a deep area of the Central Mediterranean Sea. The Ocean noise Detection Experiment collected data offshore the Gulf of Catania from January 2005 to November 2006, allowing the study of temporal patterns of dolphin activity in this deep pelagic zone for the first time. Nearly 5,500 five-minute recordings acquired over two years were examined using spectrogram analysis and through development and testing of an automatic detection algorithm. Echolocation activity of dolphins was mostly confined to nighttime and crepuscular hours, in contrast with communicative signals (whistles). Seasonal variation, with a peak number of clicks in August, was also evident, but no effect of lunar cycle was observed. Temporal trends in echolocation corresponded to environmental and trophic variability known in the deep pelagic waters of the Ionian Sea. Long-term PAM and the continued development of automatic analysis techniques are essential to advancing the study of pelagic marine mammal distribution and behaviour patterns. © The Author(s) 2017
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
La storia (im)possibile. Ancora su Histoire(s) du cinéma
No full textL'articolo analizza il monumentale lavoro di Jean-Luc Godard's Histoire(s) du cinéma alla luce della teoria della storia di Walter Benjamin. Divisa in "4 x 2 capitoli" e composta lungo un periodo di oltre vent'anni (1978-1998), la serie di Godard rappresenta il tentativo di elaborare e praticare una forma alternativa di storiografia basata sulla citazione audiovisiva e sul montaggio. Lo statuto peculiare che l'immagine viene ad assumere in tale progetto consente di situare l'impresa di Godard nella tradizione filosofica del pensiero antistoricista, da Nietzsche a Benjamin, da Charles Péguy ad André Malraux
I congegni segreti della meraviglia
No full textIl contributo si concentra sulla specificità del linguaggio scenotecnico barocco dalle origini cinquecentesche fino alla fine del XVIII secolo prendendo in esame la trattatistica teatrale del periodo
Mostrare, illudere, significare: esperienze della luce in scena
No full textIl contributo si focalizza sull'esperienza della luce in scena muovendo dalle origini rinascimentali della commedia con la scena prospettica illuminata nella sala delle feste nelle dimore signorili passando per la specializzazione illuminotecnica sviluppata nelle sale teatrali barocche per giungere a prefigurare i nuovi impianti teatrali ottocenteschi dotati prima di illuminazione a gas poi di illuminazione elettrica. L'evoluzione della luce in scena attraverso i secoli trasforma l'elemento luminoso da strumento decorativo o meramente funzionale a vero e proprio codice espressivo
Variations on the Author
Get PDF“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
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