1,721,203 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
Il proseguimento delle migrazioni interne negli anni della crisi: una dinamica solo occupazionale?
No full textIl saggio analizza le migrazioni interne della popolazione italiana negli anni delle recente crisi economica interrogandosi sulle sue tendenze e sulla sua composizione. Il lavoro avanza tuttavia l'ipotesi che alla base dei percorsi migratori interni ci siano sempre di più anche fattori legati alla diversa valutazione della qualità della vita oltre a fattori di natura lavorativa connessi non solo alla maggiore probabilità di lavoro in quanto tale, ma anche alla presenza di maggiori opportunità in termini di riconoscimento professionale e salariale
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
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
Etidronate inhibits osteoclast adhesion to bone surfaces but does not interfere with their specific recognition of single bone proteins
No full textBisphosphonates are nonbiodegradable pyrophosphate analogues that are increasingly used for inhibiting bone resorption in disorders characterized by excessive bone loss; they are in fact generally considered potent inhibitors of osteoclastic bone resorption both in vivo and in vitro but the mechanism by which these compounds exert their effect remains to be clarified. Data obtained on human systems in vitro are in particular lacking. The aim of this study was to assess the effect of etidronate (EHDP), one of the early compounds of bisphosphonates family, on osteoclast-matrix interactions and on bone resorption in a human in vitro system, using as an experimental model, osteoclast-like cells derived from giant cell tumors of bone (GCT). We reported that the presence of EHDP at the concentration ranging from 10-3 M to 10-7 M exerted a dose-dependent inhibition of the bone resorption activity with a maximal effect at 10-5 M. Because bisphosphonates owe the specificy of their actions to their ability of binding to bone surfaces, we performed adhesion assay using bone slices that had been pre-treated with solution of EHDP, at the established inhibitory concentration of hone resorption. Results showed that the morphology of cells plated onto bone slices pre-treated with the bisphosphonate was not significantly different from the control while the number of adherent cells was significantly reduced, by the treatment of about 50% vs control. Since osteoclast adhesion to the bone surface is mediated by the interaction with some adhesive proteins of extracellular bone matrix such as bone sialoprotein, osteopontin and fibronectin, furthermore the effect of EHDP on osteoclast adhesion onto specific extracellular matrix proteins, was also tested. In this case the presence of EHDP in the medium did not modify the percentage of cell adhesion compared to the control, indicating that the inhibitory effect of EHDP on cell adhesion onto hone slices, was probably not due to the interference with adhesion process of cells with specific hone matrix proteins. However we cannot exclude a possible effect on this process of EHDP that could be evident when all the components of the extracellular matrix ar present. In summary this work provides the first evidences of the inhibitory effect of EHDP on human osteoclast-like cells in vitro, confirming animal model data, possibly by a mechanism involving the adhesion process
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