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
Quantifizierung von Rußpartikeln durch Kombination von elektrostatischen Feldeinflüssen
Full text linkIn dieser Doktorarbeit werden die theoretischen Grundlagen für einen elektrostatisch arbeitenden Sensor für elektrisch leitende, luftgetragene Partikel dargelegt und am Beispiel von Rußpartikeln durch Experimente verifiziert. Es wird die Arbeitsweise des Sensors in einem mathematischen Modell abgebildet.
Es werden die Kräfte definiert und berechnet, die auf die Partikel einwirken, um eine gezielte Bewegung hervorzurufen. Die durch das elektrische Feld influenzierte Ladungstrennung innerhalb der Partikel, die eine resultierende Kraftwirkung in Richtung des stärker werdenden Feldes hervorrufen, ist nicht wesentlich für Partikelbewegung. Die für einen Antrieb eines Partikels wesentlichste Eigenschaft ist dessen Eigenladung, die, in Wechselwirkung mit dem äußeren elektrischen Feld, die stärkste Kraft liefert.
Desweiteren wird gezeigt, dass die Anzahl der auf der Messelektrode angelagerten Partikel, unabhängig von der Strömungsgeschwindigkeit des Trägergases ist.
Die an der Messelektrode angelagerten Partikel agglomerieren zu Dendriten, an deren Spitzen sich elektrische Ladungen konzentrieren. Durch das Abreißen der Dendriten wird deren Ladung von der Messelektrode abtransportiert. Der durch den Ladungs¬abtransport erzeugte Strom, in der Größen¬ordnung von Pico-Ampere, ist proportional zur Ru߬konzen-tration. Es wird durch Berechnung ermittelt, dass das Rußladungs-Messverfahren im Bereich von 40nm bis ca. 400nm unabhängig von der Partikelgröße arbeitet.
Ein Partikelsensor wurde hergestellt, vermessen und berechnet.
Die theoretischen Erkenntnisse bezüglich der Unabhängigkeit des Messsignals von der Gasgeschwindigkeit und der quadratischen Abhängigkeit von der elektrischen Feldstärke zwischen den Elektroden des Sensors, können im Versuch bestätigt werden.This paper derives the theoretical fundamentals for an electrostatically operating sensor measuring airborne electrically conductive particles and verifies the results by experiments using the example of smoke (soot) particles. The operation behavior of the sensor will be realized in a mathematical model.
The forces that act on the particles are defined and calculated in order to cause a targeted movement. The charge separation within the particles, influenced by the electrical Field, which causes a resulting force effect in the direction of the increasing field, is not essential for particle movement. The most important property for driving a particle is the own charge, which, in interaction with the external electrical field, provides the strongest force.
Furthermore, it is shown that the number of particles deposited on the measuring electrode, is independent of the flow velocity of the carrier gas.
The particles, attached to the measuring electrode, agglomerate and forming dendrites, at the tips of which electrical charges are concentrated. Caused by increasing forces the dendrites are torn off and transport away their electrical charge from the measuring electrode. The current generated by the charge removal, in the order of pico-ampere, is proportional to the soot concentration. It is determined by calculation that the soot charge measuring method operates in the range of particle diameters between 40nm up to 400nm independent of particle size.
A particle sensor was manufactured, field tested and proved by a mathematical model.
The theoretical findings concerning the independence of the measured signal from gas velocity and the quadratic dependency on the electrical field strength between the electrodes of the sensor can be confirmed in the experiment
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
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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