1,720,997 research outputs 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
Provenance study on coins minted at Velia (Italy): Pb isotope and Archaeometallurgy
No full textLead concentration and isotopes of 20 Athena/Tripod bronze coins from Velia, a Greek colony in Italy, have been
analyzed by ICP-MS and TIMS at the Laboratori Nazionali del Gran Sasso (INFN).
The coins, dated to the 1st century BC, are part of a broader project promoted by the University of Salerno that won the 2019 Art Bonus Competition.
Determining Lead isotopic ratio of these coin samples (to assign/identify a reliable metal provenance) and inves- tigating the geochemistry of the mining districts, to understand the role played by low-value coins at Velia are the main targets of this research. Lead concentrations range from fractions to tens of percentages. Lead and other trace elements data suggest that the raw materials used for the coins came from different mines. Lead isotopic ratios span from 0.836 to 0.837 and from 2.076 to 2.082 for 207Pb/206Pb and 208Pb/206Pb, respectively. The lead iso- tope results were compared with lead isotope data published of ore deposits from Mediterranean areas (Spain, Italy, Greece, and Cyprus) to fingerprint the sources of the Velia bronze coins. Almost half of the coins fall into the clusters of Spain and Tuscany, whereas only a few samples are compatible with Sifnos in Greece (four coins) and Bosa Area in Sardinia and/or Troulli mine in Cyprus (two coins).
At last, six coins cannot be associated with any known source; this suggests the possibility of extensive metal recy- cling. Regarding the Spanish provenance, Velia coins overlap the cluster of South-East Spain, corresponding to the Cartagena-Mazarron mine. This information, integrated with archaeological and historical ones, helps to reconstruct the trade routes and socio-economic relationship of the city of Velia
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
Natural killer cell activity in patients with gynecologic malignancies: correlation with histologic grading and stage of disease
No full textBasal natural killer (NK) cell activity in peripheral blood lymphocytes (PBLs) of 29 patients with gynecologic malignancy and 10 healthy controls was performed using K 562 cell line. A significant decrease of NK cell activity was observed in patients with gynecologic malignancy (p = 0.003). The NK cell activity of patients with poorly differentiated tumor or with stage IV of disease was significantly reduced with respect to patients at any other lower grade or earlier stage. We conclude that in patients with gynecologic malignancies there is a decrease of basal NK cell activity of PBLs, which is more significant in cases of distant tumor dissemination or poorly differentiated tumor (p less than 0.001)
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
L'emissione Atena/Tripode della zecca di Velia. Analisi archeometriche
No full textThe provenance study of Athena/ Tripod bronze coins from the Greek city of Velia was carried out by investigating the Lead isotope ratios at the Laboratori Nazionali del Gran Sasso-INFN. Lead isotope results were compared with those published from different mines of the Mediterranean areas to fingerprint the sources of these coins. Most of the coins have
obtained a certain provenance overlapping the clusters of Spain (S-E and N-E area), Italy (Tuscany and Sardinia), Greece (Sifnos) and Cyprus (one coin). Twenty- three coins show uncertain provenance indicating the possibility of metal recycling. This information, integrated with archaeological ones, helps to reconstruct the trade routes and socio-economic relationship of Velia
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