1,720,969 research outputs found
Osservazioni sulla diversità della fauna ittica costiera in zone soggette a differenti regimi di tutela nell’Area Marina Protetta dell’Isola dell’Asinara
No full textIn order to assess the effects of protection, coastal fish assemblages from 3 zones with different protection levels were investigated by visual census in the Asinara Island MPA (North-western Sardinia). On the whole 45 species of Teleosts from 18 families were observed. Labrids and Sparids were more abundant in both species richness and density. Significant differences in densities of Diplodus sargus and D. vulgaris in the 3 zones, due to both the protection measures and the geographic exposure, were found
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
Suspended culture of Ostrea edulis (Bivalvia, Ostreidae) in the Calich lagoon (North western Sardinia, Italy): preliminary results
No full textDispelling 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
Accrescimento in long-line di Mytilus galloprovincialis Lmk. nello stagno di Calich (Sardegna Nord-occidentale)
No full textThe Mediterranean mussel Mytilus galloprovincialis (Bivalvia, Mytilidae) was long-line cultured in two different areas of the Calich lagoon (NW Sardinia, Italy). Several physical and chemical water parameters, chlorophyll a and sedimentation rate were measured in the two culture stations and in a third considered as a control. Mussel growth rate was similar in the two stations. It was positively affected by the increase of water temperature and chlorophyll a concentration and negatively by oxygen depletion
An alternative suspended culture method for the Mediterranean carpet clam, Tapes decussatus (L.), in the Calich lagoon (North western Sardinia)
No full textTapes decussatus seed was grown in two distinct groups of six suspended modules each placed at two different sites of the Calich lagoon from January to July 2004. Each module was composed of three stacked plastic baskets filled with coarse sand to prevent shell deformities. Statistical analyses showed significant differences in carpet clam survival at the two sites, while no differences in growth were detected
- …
