1,720,953 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
Heterostrukturdesign und Wachstum von AlGaN-basierten Leuchtdioden mit Emissionswellenlängen unterhalb von 240 nm
No full textAlGaN-based ultraviolet-C (UVC) light emitting diodes (LEDs) with emission wavelengths below 240 nm (far-UVC) gained considerable interest in recent years due to their potential of skin-safe inactivation of viruses and bacteria. However, far-UVC LEDs suffer from low external quantum efficiency (EQE) and rapid output power degradation over time, limiting their implementation in applications. This thesis addresses these challenges by exploring the influence of the heterostructure design on the performance of far-UVC LEDs.
Precise control of the Si-doping concentration is essential for n-AlGaN layers with Al mole fractions above 80 %. Hall-effect and capacitance-voltage measurements (CVM) on n-AlGaN layers indicated compensation effects of the Si donor. Additionally, the lower dislocation density provided by AlN bulk substrates further improved the n-type conductivity. However, parasitic absorption of the far-UVC emission stemming from point defects in the AlN bulk substrate was observed, highlighting the importance of highly transparent AlN bulk substrates.
To investigate the rapid output power degradation of far-UVC LEDs, the charge carrier density in the multi-quantum well (MQW) was reduced by implementing a large number of quantum wells (QWs). As a result, a positive correlation between the output power and the lifetime of the LEDs was observed. Moreover, an increase in the vacancy-type point defect concentration with increasing Al mole fraction was found, which provides an explanation for the exponential decrease in EQE.
Efficient Mg-doping of high Al mole fraction AlGaN layers remains a major challenge. This thesis demonstrates that linearly graded, distributed polarization doped (DPD) AlGaN is a promising alternative to conventional Mg-doped AlGaN. CVM revealed high net polarization charge densities in the DPD layers, in accordance with theoretical calculations.
The work of this thesis led to the realization of flip-chip mounted far-UVC LEDs with emission wavelengths of 233 nm and 226 nm, EQEs of 0.7 % and 0.08 %, and L70 lifetimes of 13 h in both cases.AlGaN-basierte Ultraviolett-C (UVC) Leuchtdioden (LEDs) mit Emissionswellenlängen unterhalb von 240 nm (Fern-UVC) haben in den letzten Jahren, aufgrund ihres Potenzials zur hautverträglichen Inaktivierung von Viren und Bakterien, großes Interesse geweckt. Allerdings ist die externe Quanteneffizienz (EQE) von Fern-UVC LEDs niedrig und außerdem nimmt die Ausgangsleistung rapide mit der Zeit ab, wodurch ihre Anwendung stark limitiert ist. Diese Arbeit widmet sich diesen Herausforderungen, indem sie den Einfluss des Heterostrukturdesigns auf die Leistung von Fern-UVC-LEDs untersucht.
Eine präzise Kontrolle der Si-Dotierkonzentration ist essenziell für n-AlGaN Schichten mit Al-Anteilen über 80 %. Halleffekt- und Kapazitäts-Spannungs-Messungen (CVM) an n-AlGaN Schichten zeigten Kompensationseffekte des Si-Donators. Die geringere Versetzungsdichte von AlN Substraten führte zu einer weiteren Verbesserung der n-Leitfähigkeit. Es wurde die Absorption der Fern-UVC Emission durch Punktdefekte im AlN Substrat beobachtet, was die Bedeutung von hochtransparenten AlN Substraten hervorhebt.
Die zeitliche Leistungsabnahme wurde untersucht, indem die Ladungsträgerdichte in der aktiven Zone durch eine große Anzahl von Quantenfilmen reduziert wurde. Eine positive Korrelation zwischen der Ausgangsleistung und der Lebensdauer der LEDs wurde festgestellt. Des Weiteren wurde ein Anstieg der Vakanzkonzentration mit steigendem Al-Anteil in den Schichten beobachtet.
Effiziente Mg-Dotierung von AlGaN-Schichten mit hohem Al-Anteil bleibt eine große Herausforderung. Diese Arbeit zeigt, dass linear gradierte, Polarisationsdotierte (DPD) AlGaN Schichten eine vielversprechende Alternative zur Mg-Dotierung von AlGaN darstellen. CVM zeigten hohe Netto Polarisationsladungsdichten in den DPD-Schichten, in Übereinstimmung mit theoretischen Berechnungen.
Im Rahmen dieser Arbeit konnten aufgebaute Fern-UVC LEDs mit Emissionswellenlängen von 233 nm und 226 nm, EQEs von 0,7 % bzw. 0,08 % sowie L70 Lebensdauern von jeweils 13 h realisiert werden
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
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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