1,720,995 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
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
Open-circuit and short-circuit fault-tolerant control of an interleaved boost converter with coupled inductors
No full textLes hacheurs élévateurs à quatre phases parallèles et à commandes entrelacées (4IBC) sont largement utilisés dans les véhicules électriques à hydrogène (FCEVs) afin d’adapter la tension de la pile à combustible (PAC) au bus DC, assurer la tolérance aux défauts et réduire les ondulations de courant de la PAC. Etant donné que le poids et le volume constituent de réelles contraintes dans ces applications, la topologie du hacheur élévateur à quatre phases parallèles couplées inversement en cascade cyclique (4IBC-IC) a été adoptée. L’objectif de cette thèse consiste à améliorer la disponibilité des convertisseurs DC/DC, qui constitue une préoccupation majeure dans l’électronique de puissance. Dans ce contexte, un contrôle tolérant aux défauts de type court-circuit (SCF) et de type circuit ouvert (OCF), a été développé. La méthode de diagnostic proposée se base sur la mesure de la valeur moyenne des courants des inductances pour pouvoir identifier la phase en défaut, l’isoler et reconfigurer les signaux de commandes des phases saines. La régulation de la tension de sortie et des courants de phases est assurée par des correcteurs PI. Cette approche a été validée par simulation sur Matlab/Simulink et en simulation virtuelle en temps réel (VHIL) sur le logiciel Typhoon. Ces principaux résultats démontrent l'efficacité et la robustesse de cette approche à maintenir un fonctionnement optimal en mode sain et défaillant, sans générer de fausses détections.En raison des difficultés rencontrées pour obtenir des inductances couplées, la validation expérimentale de l’approche proposée a été validée sur un convertisseur 4IBC classique. Le contrôle tolérant aux défauts (FTC) a été exécuté et intégré sur La MicroLabBox DS1202 en utilisant une implémentation mixte entre son processeur et sa carte FPGA. Les résultats expérimentaux valident l’efficacité des résultats de simulation. Cette approche ne nécessite pas de capteurs supplémentaires, ni de temps d'échantillonnage élevé et elle est facile à mettre en œuvre. Elle peut facilement être intégrée aux contrôles existants et peut même être étendue à d'autres topologies de convertisseurs multi-phases.Afin de remédier aux limitations du correcteur PI, une amélioration des boucles de régulations a été proposée en utilisant des contrôleurs non-linéaires, qui sont robustes aux perturbations et aux variations et permettent d'améliorer la dynamique du convertisseur. Cette approche repose sur le contrôle par platitude de la tension de sortie et le contrôle par mode glissant pour la régulation des courants de phases. La particularité de cette amélioration est l'utilisation d'un observateur pour estimer la tension d'entrée et le courant de charge, afin d'optimiser judicieusement le nombre de capteurs sans utiliser de capteurs supplémentaires. L'approche de diagnostic proposée est également intégrée et communique les informations de présence de défauts avec les boucles de régulation et avec l'observateur afin d'optimiser le fonctionnement du convertisseur en mode défaillant. Les résultats de simulation montrent la robustesse de cette approche face aux variations et aux perturbations. Ces contributions améliorent la disponibilité et la robustesse des convertisseurs DC/DC et renforcent la position des FCEVs en tant qu'option viable et prometteuse pour le transport durable.Fuel cell electric vehicles (FCEVs) are seen as potential solutions and represent one of the most recent advances in the field of transport to reduce CO2 emissions. As the fuel cell is the main power source, a boost converter is required to increase its low voltage and adapt it to the DC bus voltage. The four-phase interleaved DC/DC boost converter with inverse cyclic cascade coupled inductors (4IBC-IC) has been confirmed as the most suitable architecture for fuel cell electric vehicles. Not only does it improve efficiency and reduce the converter’s size, but it also helps to extend the fuel cell's lifespan by reducing input current ripple. Since semiconductors are very fragile components, they can fail and degrade fuel cell system performance. Even if the converter architecture is fault-tolerant, it requires a fault-tolerant controller to ensure optimal operation in the event of disturbances or faults. In this context, a signal-based fault-tolerant control is proposed in this thesis to diagnose both short-circuit fault (SCF) and open-circuit-fault (OCF). Once the fault is detected, it is isolated by the control unit and the converter architecture is then reconfigured according to the fault location to ensure optimal operation. PI correctors are implemented to ensure the regulation of the output voltage and phase currents. Due to the unavailability of coupled inductors, this approach has been validated experimentally on a classical four-phase interleaved boost converter (4IBC) test bench using the MicroLabBox DS1202 with its processor and internal FPGA board to implement the fault-tolerant control.Simulation, on Matlab/Simulink and virtual hardware simulation (VHIL), and experimental results validate the robustness of the proposed fault-tolerant control. It is easy to implement and can quickly identify faults without the need for additional sensors. It operates efficiently without requiring high sampling rates, addressing one of the key limitations of signal-based methods. Given its simplicity of implementation, the proposed method can be easily integrated into existing controls and can even be extended to other multilevel converter topologies.To improve the robustness of the control unit, a novel fault-tolerant robust control approach has been proposed by replacing the traditional PI controllers with flatness-based and sliding mode controllers while incorporating an observer. The observer plays a key role in accurately estimating the input voltage and load current, ultimately ensuring high robustness against disturbances. A judicious optimization of the number of sensors is thus achieved, minimizing the cost and the probability of measurement errors. Simulation results in the Matlab/Simulink environment confirm the effectiveness of this approach. This significant contribution strengthens the reliability and robustness of DC/DC converters with coupled inductors and consolidates the position of the FCEVs as a promising sustainable mobility solution
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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