1,721,003 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
Detection of performance-enhancing substances in hair, body hair and nails : analytical approaches and application to doping cases, clinical cases and forensic investigations
No full textDu fait de leur accès facilité par Internet, de nombreux produits sont détournés par les sportifs de haut niveau mais également par les amateurs (culturistes, par exemple) pour améliorer leur performance physique, esthétique et/ou mentale. Dans le cadre de cette thèse, je me suis intéressée aux substances de la performance suivantes, qui sont interdites en permanence par l’Agence Mondiale Anti-dopage (AMA) : les agents anabolisants classés S1 - les modulateurs sélectifs des récepteurs des androgènes (SARMs) S1.2 - les modulateurs hormonaux et métaboliques S4 et enfin la classe S5 qui comprend les diurétiques et les agents masquants. L’abus de ces substances peut conduire à des effets secondaires de type psychiatrique, de l’agressivité et à des complications pour la santé pouvant mener jusqu’au décès. Il est donc important de savoir les identifier dans un laboratoire de toxicologie médico-légale. Afin de comprendre si les résultats anormaux (dopage) ou positifs (médico-légal) observés sont dus à des contaminations environnementales, à des malversations ou à des pratiques dopantes caractérisées, l’analyse des phanères (cheveux, poils) a été choisie. L’objectif principal de cette thèse a été d’établir des critères d’interprétation pour expliquer les résultats dans les phanères. La première partie du travail a été consacrée à la mise en place d’une stratégie analytique et au développement et à la validation de trois méthodes d’analyses robustes et sensibles dans les cheveux à l’aide de systèmes de chromatographie liquide/gazeuse couplée à des détecteurs de spectrométrie de masse en tandem. A ce jour, les librairies de spectres MS comportent 20 stéroïdes anabolisants et 10 esters de testostérone, nandrolone, drostanolone et boldenone, 9 SARMs et 2 modulateurs métaboliques associés à la consommation de SARMs et enfin 9 diurétiques. Les méthodes MS sont mises à jour dès lors qu’un nouveau produit est commercialisé. Après la mise en place des méthodes analytiques, ma thèse a porté sur la caractérisation de l’incorporation de ces substances dans les cheveux, les poils et/ou les ongles. Pour ce faire, les méthodes ont été appliquées à des cas de dopage dans des cas de suspicion de contamination, à des affaires médico-légales dans des cas de violence ou de décès lié à l’abus d’agents anabolisants et à des cas cliniques dans le cadre du suivi thérapeutique des patients admis à l’hôpital. Pour finir, afin d’augmenter la spécificité des méthodes, d’identifier de nouveaux produits et leurs métabolites dans les urines ou d’identifier des produits inconnus avec précision, il a été nécessaire d’utiliser deux outils supplémentaires : les microsomes hépatiques humains (HLMs) et la spectrométrie de masse haute résolution (HRMS). Ces travaux ont donné lieu à 22 publications nationales et internationales ainsi qu’à de nombreuses collaborations.Because of their easy access through the Internet, many products are misused by top athletes but also by amateurs (bodybuilders, for example) to improve their physical, aesthetic and/or mental performance. In the framework of this thesis, I was interested in the following performance-enhancing substances, which are permanently banned by the World Anti-Doping Agency (WADA) : anabolic agents classified as S1 - selective androgen receptor modulators (SARMs) S1.2 - hormonal and metabolic modulators S4 and finally the S5 class which includes diuretics and masking agents. Abuse of these substances can lead to psychiatric side effects, aggression and health complications that can lead to death. It is therefore important to know how to identify them in a forensic toxicology laboratory. In order to understand whether the adverse analytical findings (doping) or positive (forensic) results observed are due to environmental contamination, malpractice or doping practices, the analysis of keratinous matrices (hair) was chosen. The main objective of this thesis was to establish interpretation criteria to explain the results in hair. The first part of the work was devoted to the establishment of an analytical strategy and the development and validation of three robust and sensitive analytical methods in hair using liquid chromatography/gas systems coupled with tandem mass spectrometry detectors. To date, the MS spectra libraries include 20 anabolic steroids and 10 esters of testosterone, nandrolone, drostanolone and boldenone, 9 SARMs and 2 metabolic modulators associated with SARM consumption and 9 diuretics. The MS methods are updated as soon as a new product is marketed. After setting up the analytical methods, my thesis focused on the characterization of the incorporation of these substances in hair and/or nails. To do so, the methods were applied to doping cases in cases of suspected contamination, to forensic in cases of violence or death related to the abuse of anabolic agents and to clinical purposes in the context of therapeutic follow-up of patients admitted to hospital. Finally, in order to increase the specificity of the methods, to identify new products and their metabolites in urine or to identify unknown products with precision, it was necessary to use two additional tools : human liver microsomes (HLMs) and high resolution mass spectrometry (HRMS).This work has resulted in 22 national and international publications and numerous collaborations
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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