1,720,993 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
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
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
Development of a submillimeter minimally invasive magnetic localization system for cardiac arrhythmia ablations
No full textLes arythmies cardiaques sont des troubles du rythme cardiaque pouvant nécessiter une procédure d’ablation des cellules responsables grâce à un cathéter. Ce type de procédure peut être effectué avec des systèmes de navigation magnétique pour avoir un contrôle direct du cathéter au niveau du cœur. Dans ce contexte, cette thèse présente l’électronique et l’instrumentation nécessaire au développement d’un système de localisation magnétique intégré à la navigation magnétique. L’objectif est de réduire les doses de radiation induite par la fluoroscopie et d’augmenter encore le contrôle du cathéter. Cette thèse a permis de développer des caméras magnétiques et leur procédure de calibration. Ces instruments ont été utilisés pour développer notre système de localisation en remplaçant les modèles de champs par des mesures expérimentales. Des premières évaluations des performances de la localisation ont été réalisées ainsi qu’une preuve de concept couplant navigation et localisation magnétique.Cardiac arrhythmias are heart rhythm disorders that may require a procedure to ablate the responsible cells using a catheter. This type of procedure can be carried out using magnetic navigation systems to provide direct control of the catheter at the level of the heart. In this context, this PhD work presents the electronics and instrumentation required to develop a magnetic localisation system integrated with magnetic navigation. The aim is to reduce the radiation doses induced by fluoroscopy and further increase catheter control. This PhD work led to the development of magnetic cameras and their calibration procedure. These instruments were used to develop our localisation system by replacing field models with experimental measurements. Initial localisation performance evaluations were carried out, as well as a proof of concept combining navigation and magnetic localisation
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Development and characterization of a portable NMR probe for the monitoring of water quality and for the study of the kinetics of chemical reactions
No full textLa spectroscopie de résonance magnétique nucléaire (RMN) est une technique amplement utilisée pour la détection et la quantification de composés chimiques avec un spectre d’application très large. Dans ce manuscrit, deux d’entre eux sont traités : la détection de polluants dans l'eau potable et la surveillance des réactions chimiques. Alors que les équipements de RMN de laboratoire présentent des résultats d'analyse très fiables, la RMN portable est un domaine de recherche en évolution avec de multiples défis technologiques et d’autres liés aux applications ciblées. Les dispositifs RMN portables émergents présentent cependant comme avantage évidente par rapport aux dispositifs classiques leur utilisation directe sur le terrain. Cela permet ainsi d’avoir des résultats d’analyses plus rapidement et de limiter les coûts de personnel et de consommables. Afin de concevoir des spectromètres RMN portables, on doit faire des compromis de conception, tout en étant capable de comprendre les enjeux liés à ces choix, afin que le produit final puisse toujours répondre aux exigences des applications concernées. Pour cela, nous proposons une chaîne d'outils de simulation RMN complète, capable de générer divers aboutissements correspondant à un spectromètre RMN réel. En outre, nous développons une preuve de concept de l’électronique de contrôle et d’acquisition basée sur des composants commerciaux disponibles et nous la validons sur notre prototype de spectromètre RMN portable. Finalement, ce prototype est utilisé pour évaluer le potentiel de la RMN portable pour les applications citées ci-dessus. Cette étude nous a permis d’identifier les limites du dispositif actuel et de proposer un cahier des charges visant son amélioration continue.Nuclear Magnetic Reaction (NMR) spectroscopy is a widely employed technique in the detection and quantification of chemical compounds, with a wide range of applications. In this manuscript, the focus is put on two of them: the detection of pollutants in drinking water and the monitoring of chemical reactions. While laboratory NMR equipment presents highly reliable analysis results, portable miniaturized NMR is an evolving research field with multiple technological and application-related challenges. Such emerging devices present however a clear advantage when compared to the classic, stablished ones: it can be used in the field, therefore saving time and limiting staff and consumables costs. In order to design NMR spectrometers to attain the desired portability and miniaturization, one has to compromise, however being able to understand what is at stake, so that the final product still meets the demands. For that, we propose a complete NMR simulation toolchain capable of generating diverse outcomes corresponding to a real NMR spectrometer. Furthermore, we develop a proof of concept for an electronic control and acquisition unit based on commercial-off-the-shelf components and validate it on a portable NMR spectrometer prototype. Finally, we use this prototype to assess the potential of portable miniaturized NMR for the targeted applications cited above. This study allowed us to identify the limits of our current prototypical device and to provide directions for its further improvement
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