1,720,963 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
Dry forced triboelectric charging for sorting of fine powders
Full text linkDie weltweite Nachfrage nach seltenen und kritischen Materialien wie Lithium und Kobalt steigt aufgrund ihrer wichtigen Rolle in erneuerbaren Energiesystemen, Elektrofahrzeugen und moderner Elektronik. Ihre begrenzte Verfügbarkeit und die Umweltbelastung durch den Abbau haben jedoch den Bedarf an nachhaltigem Recycling erhöht. Lithium-Ionen-Batterien (LIBs) sind eine konzentrierte sekundäre Lithiumquelle, doch führt das herkömmliche Recycling - insbesondere pyrometallurgische Prozesse - oft zu erheblichen Verlusten in der Schlackenphase. Obwohl diese Schlacken reich an kritischen Elementen sind, werden sie aufgrund ihrer chemischen und mineralogischen Komplexität nicht ausreichend genutzt. Die vorliegende Arbeit schließt diese Lücke durch die Entwicklung einer Trockentrennmethode unter Verwendung der forcierten triboelektrischen Aufladung (FTC) mit elektrostatischer Sortierung, die sich auf die selektive Rückgewinnung von Lithiumaluminat (LiAlO₂) aus feinen EnAM-Li-Schlackenpulvern konzentriert. Die Forschung ist Teil des von der DFG geförderten Schwerpunktprogramms SPP2315, das sich mit den Herausforderungen der Materialrückgewinnung aus Industrieabfällen befasst. Das Hauptziel ist es, die triboelektrische Aufladung durch Partikel-Wand-Kollisionen unter extern angelegten elektrischen Feldern zu verstehen und zu kontrollieren. Im Gegensatz zur konventionellen triboelektrischen Aufladung, die von zufälligen Teilchenwechsel-wirkungen abhängt, ermöglicht die FTC eine spannungsgesteuerte, gerichtete Aufladung, die die Selektivität verbessert und die Streuung der Ladungspolarität sowie bipolare Effekte (z. B. Gleichfall) minimiert. Das FTC-Verfahren funktioniert so, dass die Pulver eine geneigte Hochspannungs-Kupferrutsche hinunterfallen. Die Partikel erhalten Netto-Oberflächenladungen durch Wechselwirkungen mit der Rutschenwand und anderen Partikeln, die auf ihrer triboelektrischen Reihenposition und der angelegten Spannung basieren. Dies ermöglicht die selektive Aufladung von LiAlO₂, während andere Partikel anders aufgeladen werden. Nach der Aufladung werden die Teilchen stromabwärts durch elektrische Felder auf der Grundlage der Ladung getrennt. Es wurde ein Versuchsaufbau für die Ladungsmessung in Echtzeit entwickelt. Untersucht wurden Variablen wie Partikeleigenschaften (Größe, Form, Material), Betriebsbedingungen (Rutschenwinkel, Länge, Vorschubgeschwindigkeit) und Umweltfaktoren (insbesondere relative Luftfeuchtigkeit). Eine Schlüsselkomponente der Forschung ist der Einsatz von Techniken zur Modifizierung der Pulveroberfläche, um das triboelektrische Verhalten zu verbessern. Behandlungen wie thermische Vorkonditionierung und Feuchtigkeitskontrolle wurden eingesetzt, um die Auswirkungen der einzelnen Parameter auf die Aufladung zu bewerten. Um FTC besser zu verstehen, wurden in Simulationen mit der Diskrete-Elemente-Methode (DEM) die Partikelbewegung, die Aufladung und die Interaktionen untereinander und mit der Rutsche untersucht. Die Simulationen beinhalteten realistische Partikeleigenschaften - Größe, Dichte, Steifigkeit - und testeten verschiedene Schurrenwinkel und Durchflussraten. Die Ergebnisse zeigten eine gute Übereinstimmung mit experimentellen Messungen und wiesen auf Bereiche hin, in denen die Gestaltung der Schurre und die Prozesseffizienz verbessert werden können. Schließlich wurde FTC auf echte EnAM-Li-Schlacken angewandt, die aufgrund ihrer komplexen Zusammensetzung und ihres geringen Lithiumgehalts schwer zu verarbeiten sind. Ein entscheidender Faktor für die Lithiumrückgewinnung war die Größe und Freisetzung von LiAlO₂-Kristallen. Vorbehandlungsmethoden wie das Mahlen verbesserten das Ladeverhalten und die Rückgewinnung. Trotz der Komplexität reicherte FTC die lithiumreichen Partikel effektiv an und bewies damit sein Potenzial als trockene, umweltfreundliche Methode zur Rückgewinnung wertvoller Elemente aus Industrieabfällen.The global demand for rare and critical materials such as lithium and cobalt is accelerating due to their essential role in renewable energy systems, electric vehicles, and modern electronics. However, their finite availability and the environmental damage from extraction have heightened the need for sustainable recycling. Lithium-ion batteries (LIBs) are a concentrated secondary source of lithium, yet conventional recycling—especially pyrometallurgical processes—often results in significant losses to the slag phase. These slags, though rich in critical elements, are underutilized due to their chemical and mineralogical complexity. This thesis addresses this gap by developing a dry separation method using Forced Triboelectric Charging (FTC) with electrostatic sorting, focusing on selective recovery of lithium aluminate (LiAlO₂) from fine Engineered Artificial Mineral (EnAM) Li-slag powders. The research is part of the DFG-funded Priority Program SPP2315, targeting material recovery challenges from industrial waste. The main goal is to understand and control triboelectric charging via particle-wall collisions under externally applied electric fields. Unlike conventional triboelectric charging, which depends on random particle interactions, FTC enables voltage-controlled, directional charging, improving selectivity and minimizing charge polarity dispersion and bipolar effects (e.g., Gleichfall). The FTC process works as powders descend an inclined, high-voltage copper chute. Particles acquire net surface charges through interactions with the chute wall and other particles, based on their triboelectric series position and the applied voltage. This allows selective charging of LiAlO₂ while leaving other particles charged differently. After charging, particles are separated downstream using electric fields based on charge. An experimental setup was developed for real-time charge measurement. Variables such as particle properties (size, shape, material), operating conditions (chute angle, length, feed rate), and environmental factors (especially relative humidity) were investigated. A key component of the research is the use of powder surface modification techniques to improve triboelectric behavior. Treatments like thermal pre-conditioning and humidity control were used to assess each parameter’s impact on charging. To better understand FTC, Discrete Element Method (DEM) simulations studied particle movement, charging, and interactions with each other and the chute. Simulations included realistic particle properties—size, density, stiffness—and tested various chute angles and flow rates. The results showed good agreement with experimental measurements and highlighted areas for improving chute design and process efficiency. Finally, FTC was applied to real EnAM Li-slags, which are difficult to process due to their complex composition and low lithium content. A critical factor for lithium recovery was the size and liberation of LiAlO₂ crystals. Pre-treatment methods such as milling improved charge response and recovery. Despite the complexity, FTC effectively enriched lithium-rich particles, demonstrating its promise as a dry, eco-friendly method for recovering valuable elements from industrial waste
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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