1,720,959 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Cariological Studies on Endodontically Treated Teeth
No full textCaries might jeopardize the long-term successful outcome of endodontic therapy. Therefore, it is of an interest for the endodontist to evaluate caries susceptibility of root-filled teeth (RFT). In the present thesis, several studies were conducted to explore this relationship. In the first study, caries risk profile of 200 Saudi adults, using the Cariogram, and the frequency of recurrent caries in RFT were evaluated. All individuals were interviewed about their oral health, dietary habits and use of fluoride. Caries was registered both clinically and radiographically. Salivary and microbiological data were obtained using chair-side tests. The findings from this study did not show any significant difference in caries risk profile, at the individual level, except for the mutans streptococcus count. A significant difference was detected, however, in the proportion of recurrent caries, which was higher in RFT compared to vital teeth. Caries susceptibility of RFT can be attributed to both extrinsic and intrinsic factors. In the second study, caries susceptibility of RFT was compared with contra-lateral non-root-filled teeth (NRFT) plaque-related factors. This study was carried out on a sub-sample (20 patients) with two or more RFT, recruited from the participants in the first study. Each patient was examined regarding cariogenic microflora of proximal plaque, in situ plaque pH-drop after a sucrose rinse (the Stephan curve) and de novo plaque formation. Recurrent caries and the quality of the coronal fillings/crowns of the teeth were also evaluated. The results showed that endodontically treated teeth had an increased susceptibility to caries, ascribed either to alteration in their biological environment, or to inadequacy of the marginal fit of the dental restoration. In the third study, the frequency of recurrent caries in RFT versus NRFT was evaluated, retrospectively. The material consisted of totally of 11,554 teeth in 832 subjects, pooled from a large cross-sectional epidemiological study conducted in Jönköping, Sweden. The findings showed a significant association between endodontically treated teeth and recurrent caries. The fourth study assessed the effects of sodium hypochlorite (NaOCl), ethylenediaminetetraacetic acid (EDTA) and chlorhexidine (CHX) in various strengths and combinations on the demineralization of dentin, considering their use as irrigation solutions. Thirty-five single-rooted teeth were extracted and randomly allocated into seven groups. The teeth were analyzed with micro-computed tomography (micro-CT), before and after the treatment. Volume measurements, to assess the demineralization effect, were carried out with software. The data showed that NaOCl and EDTA irrigation solutions changed the quality of dentin, in a way that it may increase the caries susceptibility. To conclude, the results from this thesis should raise the awareness among dental clinicians regarding the potential increase in caries risk following endodontic treatment, and accordingly, precautionary measures should take place
Variations on the Author
Get PDF“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
Cytotoxicity assessment of components of the Epiphany resin-percha obturating system by indirect and direct contact Millipore filter assays
Get PDFThe Epiphany System was assessed for cytotoxicity, compared to gutta-percha and AH-Plus sealer. Specimen disks (Resilon, gutta-percha), filled glass rings (sealers), or imbibed cellulose disks (primer, thinning resin) were placed over Millipore filters in direct or indirect contact with a HeLa cell monolayer, incubated for 2h and stained with tetrazolium blue. Cytotoxicity was rated by the surrounding unstained zone: none (0mm), mild (≤ 7mm), moderate (7-12mm), or marked (>12mm). Data were analyzed with 1-way ANOVA and post-hoc pairwise t-tests. Unstained zones indicating moderate cytotoxicity were significantly larger (p<0.05) for Epiphany primer than for thinning resin and for freshly mixed AH-Plus than for Epiphany sealer. Set sealers (24, 48h), gutta-percha and Resilon elicited non-cytotoxic responses. In conclusion, cytotoxicity of set Epiphany sealer and Resilon was comparable to that of set AH-Plus and gutta-percha. Cytotoxicity of freshly mixed Epiphany sealer, primer, and thinning resin did not exceed that of freshly mixed AH-Plus.M.Sc
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Get PDFWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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