1,720,988 research outputs found
Unusual massive beaching of Dalophis imberbis (Delaroche, 1809) (anguilliformes, ophichtidae) from the Central Tyrrhenian Sea
No full textAn unusual massive beaching of about two hundred specimens of the ophichthid eel Dalophis imberbis in the Central Mediterranean Sea was documented with in situ photographs and direct observations of beached specimens. No records of massive beaching of this species are reported in literature and only isolated specimens of D. imberbis were sporadically found beached. This event might be directly related to a severe wintry storm that affected the Latium coast from 2 to 5 March 2017. Some specimens were collected and measured and following laboratory analysis showed that had empty stomachs and no mature reproductive structures despite their large size (Mean TL mm > 400). In this way, further studies are required to determine the causes of this very uncommon event
Ophelia roscoffensis Augener, 1910: a new polychaete record in Italian waters
Full text linkOphelia roscoffensis Augener, 1910 is an opheliid worm identifiable by the number of anterior abranchiate chaetigers and the number of the gill pairs. Although it was already reported in the Mediterranean Sea, it has never been found in the Italian waters. This study represents the first record of Ophelia roscoffensis in the Italian waters. A total of 18 specimens were collected along the coast of Civitavecchia (Tyrrhenian Sea) in a Posidonia oceanica (L.) Delile bed at a depth of 7 m
How algae influence sessile marine organisms. The tube worms case of study
No full textTube worms and phytobenthic assemblages in three infralittoral and shallow circalittoral Mediterranean benthic communities developed between 5 and 35 m depth at Punta del Lazzaretto (Giglio Island, Central Thyrrenian sea) were investigated. Despite being three algae-dominated habitats, these displayed different covering both in terms of algal layers and algal morphologies, reflecting different structural
organizations. Twenty-eight serpulid taxa have been reported, increasing both diversity and density values from most photophilic to most sciaphilous habitats. Multivariate analyses showed how algal thalli
and tube worm assemblages were strongly correlated; substrata are influenced both physically and biologically, providing different conditions for tube worm settlement
First record of the invasive and cryptogenic species Jassa slatteryi Conlan, 1990 (Crustacea: Amphipoda) in Italian coastal waters
No full textJassa slatteryi is a cosmopolitan amphipod reported as cryptogenic or invasive species throughout the world. Although it had been signaled in the Mediterranean Sea, it was never found on the Italian coasts. This study represents the first record of J. slatteryi in Italy. A total of 87 specimens were collected on artificial hard substrates in the Port of Civitavecchia (Rome). The presence of this species in the Mediterranean Sea was probably underestimated due to the similar morphological features and ecological requirements of different species of Jassa spp
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
Investimenti nell'energia rinnovabile senza consumo di suolo. Un'analisi della fattibilità finanziaria dell'istallazione di micro-turbine eoliche sui tetti della città di Bari
No full textIn questa ricerca è stata analizzata la convenienza finanziaria nell'installazione delle micro-turbine eoliche sui tetti della città di Bari (Italia). Le elaborazioni effettuate hanno consentito di definire mappe di "ventosità" in termini di velocità media del vento e di produzione annuale di energia, e mappe valutative, in termini di profitto totale per gli investitori e di valori di locazione dei tetti piani di edifici esistenti. Le mappe generate costituiscono un riferimento primario per gli operatori interessati a sfruttare le possibilità offerte dalle normative energetiche per l'installazione di turbine a vento sul tetto e identificare le aree caratterizzate da rendimenti superiori. Inoltre, il modello ottenuto fornisce agli investitori e ai proprietari dei tetti piani, i valori economici delle aree in cui l'installazione di turbine a vento sul tetto è maggiormente conveniente
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