1,720,957 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
Localisation of MHD modes in the pedestal of ASDEX upgrade
Get PDFIn der inter-ELM Phase sogenannter H-Moden Plasmen am ASDEX Upgrade TOKAMAK erscheinen MHD-Moden in der Magnetik. Sie haben einen Frequenzbereich bis zu mehreren hundert kHz und können mittels Induktionsspulen beobachtet werden. Ziel dieser Arbeit ist deren radiale Lokalisierung im Plasma sowie die Bestimmung der Geschwindigkeit der Moden, um sie mit Plasmadriften zu vergleichen.Mögliche Auslöser und Treiber von Moden folgen aus einer Betrachtung der TOKAMAK Stabilität. Ein Überblick verschiedener Typen von Moden wird gezeigt. Die Modenstruktur ist durch zwei Parameter charakterisiert, die poloidale Modenzahl m und die toroidale Modenzahl n. Es wird diskutiert wie die magnetische Topologie, im Speziellen der Sicherheitsfaktor, verantwortlich für die Modenstruktur ist. Diese Beziehung zum Sicherheitsfaktor bietet eine Möglichkeit zur Lokalisierung der Moden. Verwendete Diagnostiken werden vorgestellt und ein Programm zur Bestimmung der Modenzahlen wird erklärt. Dies beinhaltet eine neuartige Subroutine für die poloidale Modenzahlbestimmung. Diamagnetische Driften wurden kürzlich in einer Bachelorarbeit mit einer neuen Fitroutine berechnet, die ebenfalls erklärt wird.Anhand von einigen Beispielen aus dem Typ-I ELM Regime wird die Lokalisierung und Geschwindigkeitsberechnung demonstriert. Bei der Lokalisierung wird wiederholt eine Position nahe der Separatrix erhalten, die Präzision ist durch die Reichweite des Equilibriums limitiert. Eine eindeutige Diskrepanz zwischen der Modengeschwindigkeit und den Plasmadriften wird gezeigt, was auf ein Wellenphänomen mit zusätzlicher Phasengeschwindigkeit hindeutet.In the inter-ELM phase of H-mode plasmas at ASDEX Upgrade, MHD modes appear in the magnetic signature. They exhibit a frequency range up to several hundred kHz and can be observed through pick-up coils. This thesis aims to localize their radial position in the plasma as well as to find the velocity with which they move to compare it to plasma drifts.Possible driving causes for the modes follow from a TOKAMAK stability consideration. An overview of mode types is given. The mode structure is characterized by two parameters, the poloidal mode number m and the toroidal mode number n. It is discussed how the magnetic topology, especially the safety factor, determines the mode structure. This relation to the safety factor presents a possibility to localize the modes. The applied diagnostics are presented and a program to compute the mode numbers is explained. This includes a new subroutine for the determination of the poloidal mode number. Calculation of diamagnetic drift velocities was done in a recent bachelor's thesis through a novel fitting routine, which is also explained.Based on several examples from the type-I ELM regime, the localization and velocity calculation is demonstrated. The localization consistently yields a position close to the separatrix, the precision is ultimately limited by the range of the equilibrium reconstruction. A clear discrepancy in the velocity compared to plasma drifts is shown which hints at the presence of a wave phenomenon adding a phase velocity
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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