1,721,022 research outputs found
Tecniche di rilievo e modellazione tridimensionale in diversi contesti archeologici subacquei
Full text linkUnderwater investigation a marble Cargo wreck at Capo Bianco near Isola Capo Rizzuto, Crotone, Italy
No full text
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
The Hook-Shaped Masthead in Late Antiquity and the Early Middle Ages
No full textL'iconografia navale tra l'epoca tardo-romana e almeno il 12 secolo d.C. mostra un particolare tipo di calcese "a uncino" che componeva la testa d'albero delle imbarcazioni. Lo si trova non solo nelle imbarcazioni armate con vela latina, ma anche in quelle armate con vela quadra. Due recenti rinvenimenti archeologici permettono di ipotizzare che non si trattasse di un calcese funzionale a portare la drizza più avanti, per facilitare la manovra dell'antenna durante le virate, come ipotizzato da alcuni studiosi, ma per proteggere la testa d'albero e per sostituire facilmente questo importante elemento dell'attrezzatura in caso di usura o di rottura. Il calcese "a uncino" è spesso enfatizzato nell'iconografia, fatto che suggerisce un suo valore simbolico che dovrà essere indagato.Iconography from the Late Roman period to at least the 12th century AD shows the use of a hook-shaped masthead on sailing vessels. Hook-shaped mastheads are shown not only on lateen-rigged but also on square-rigged vessels. Recent discoveries in archaeological contexts allow us to suggest that the shape was not necessary to keep the halyard as far forward of the mast as possible, to facilitate the movement of the yard while tacking, as supposed by some scholars. Rather, it facilitated the replacement of the masthead and protected the top of the mast. The oversizing of this element in iconography might suggest a symbolic meaning that should be investigated
Archaeological and archaeometric investigation of the Roman marble cargos of Porto Cervo (Arzachena, Sassari, Italy) and Secche della Meloria (Livorno, Italy)
No full textMinero-petrographic and geochemical analyses, carried out on thirty-four
samples of marble blocks and elements belonging to shipwrecked cargos
at Porto Cervo (22 samples) and Secche della Meloria (12 samples),
have indicated that the marble originated from the Apuan Alps (Italy),
which implies that the ships may have come from the Roman city of
Luna. Ceramic finds enabled dating one shipwreck to the
end of the 2nd/beginning of the 3rd century AD and the other to
the 1st -2nd century AD. The destination of the Porto Cervo cargo could
have been Africa or Sicily, while a site on the way to Portus has here
been hypothesized as a possible destination for the smaller Secche della
Meloria ship
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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