1,721,014 research outputs found
A new sphenodontian (Reptilia, Lepidosauria) from the Lower Cretaceous of Southern Italy and the phylogenetic affinities of the Pietraroia Plattenkalk rhynchocephalians
No full textThe Pietraroia Plattenkalk (Albian, Lower Cretaceous) of Southern Italy is known for well-preserved fossil vertebrates, including the rhynchocephalian lepidosaur Derasmosaurus pietraroiae. A previously described Pietraroian rhynchocephalian differs from Derasmosaurus in vertebral, pelvic and foot morphology. A third Pietraroian rhynchocephalian is described for the first time. The new specimen is smaller and more gracile than the other Pietraroian rhynchocephalians, shows a broad unpaired parietal with a small foramen, and robust dorsal neural spines. Comparison with the ontogenetic series of Sphenodon suggests that small body size and relatively broad parietal in the new rhynchocephalian indicate immaturity, although the complete obliteration of the interparietal suture and the relatively small size of the parietal foramen may support an ontogenetically mature condition for that specimen. The morphology of the dorsal vertebrae excludes referral to Derasmosaurus. Phylogenetic analyses placed the second specimen among the basal branch of Opisthodontia, and the third specimen and Derasmosaurus among Sphenodontinae. The phylogenetic reconstruction supports the interpretation of the Pietraroian rhynchocephalians as late-surviving members of Jurassic lineages
Non conventional analytical indices to evaluate the quality of the covering oil during the shelf-life of preserved vegetables
No full textSamples of preserved dried tomatoes were prepared in the laboratory utilising extra virgin olive oil as covering medium. Analytical indices represented by the percentages of the classes of oxidation, polymerisation and hydrolysis of triglycerides, were considered. The results indicated that the overall oxidation, as the sum of oxidized triglycerides plus triglyceride oligopolymers, increased during the first months and then stabilized enabling the product to be consumed at the end of the storage time. The trans isomers of unsaturated fatty acids did not change after heat treatment and during the storage period and may be used to ascertain the genuineness of the covering oil
"Non-Conventional Analytical indices to Evaluate the Quality of the Covering Oil during the Shelf-Life of Preserved Vegetables” PRIMO CONVEGNO NAZIONALE “SHELF-LIFE DEGLI ALIMENTI CONFEZIONATI”
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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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