1,721,024 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
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
Urinary 1-hydroxypyrene in full term pregnant women and ther newborn babies as biological exposure index to polycyclic aromatic hydrocarbons [L’1-idrossipirene nelle urine di gravide a termine e nei loro neonati come indice di esposizione ad idrocarburi aromatici policiclici]
No full text'Trans-placental' exposure to polycyclic aromatic hydrocarbons (PAHs) in newborn babies of mothers smoking during pregnancy was investigated and compared with that in newborn babies of non smoking mothers. PAHs intake was evaluated by measuring urinary levels of 1-hydroxypyrene, a pyrene metabolite and a biological index of exposure. 42 mothers-babies couples (31 smoking and 11 non smoking mothers) were examined. Urinary concentrations of 1-hydroxypyrene in 42 controls, 18 non smoking and 24 smoking women, were determined at the same time. Mean values of 1-hydroxypyrene in non smoking women in labour and their babies were 0.15 (SD 0.11) and 0.15 (SD 0.10) μg/g creatinine respectively. In controls the mean was 0.15 (SD 0.09) μg/g creat. Mean values of 0.23 (SD 0.17) and 0.20 (SD 0.15) μg/g creatinine were determined in smoking mothers and their newborn babies, whereas in smoking controls 1-hydroxypyrene was 0.42 (SD 0.45) μg/g creatinine. The highest levels of 1-hydroxypyrene were detected in smokers (both controls and women in labour). Babies of smoking mothers also showed a higher mean value of 1-hydroxypyrene than babies of non smokers. However the only statistically significant difference found was between smoking and non smoking controls
Nasal cancer in leather workers: an occupational disease
No full textNasal cancer has a number of causative agents; exposures to most of the established nasal carcinogens occur in the workplace. An increased risk of nasal cancer has been ascertained in shoe-making and shoe-repairing, but the results for leather goods manufacture and leather tanning don't provide adequate evidence of carcinogenicity. Findings from two epidemiological studies carried out in Italy (a case/control study and a case/series report) add further information on this issue. The case/control study was performed in the provinces of Siena (Tuscany), Verona and Vicenza (Venetia) including 96 cases and 378 controls. A significant increased risk (Odds Ratio: 6.8; 90% C.I. = 1.9-25) of sinonasal cancer was found for the employ in the whole leather industry; Odds Ratio of 8.3 (C.I. = 1.9-36) and 5.0 (C.I. = 0.92-28) were associated with shoe-making and leather tanning. The case/series report is based on 110 patients accepted in some Italian hospitals during last three years (1990-1993): 26 cases had worked in the leather industry; adenocarcinoma is the most frequent type observed. Chromium salts and natural tannins are indicated as possible aetiological agents
Considerazioni sui casi diagnosticati come mesoteliomi in ambiente ospedaliero nel periodo 1979-80
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