1,721,582 research outputs found
Computational Methods in Applied Mathematics (CMAM 2022 Conference, Part 1)
No full textThis paper introduces the contents of the first of two special issues associated with the 9th International Conference on Computational Methods in Applied Mathematics, which took place from August 29 to September 2, 2022 in Vienna. It comments on the topics and highlights of all twelve papers of the special issue
Computational Methods in Applied Mathematics (CMAM 2022 Conference, Part 2)
No full textThis paper introduces the contents of the second of two special issues associated with the 9th International Conference on Computational Methods in Applied Mathematics, which took place from August 29 to September 2, 2022 in Vienna. It comments on the topics and highlights of all twelve papers of the special issue
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
Energy contraction and optimal convergence of adaptive iterative linearized finite element methods
No full textWe revisit a unified methodology for the iterative solution of nonlinear equations in Hilbert spaces. Our key observation is that the general approach from [P. Heid and T. P. Wihler, Adaptive iterative linearization Galerkin methods for nonlinear problems, Math. Comp. 89 2020, 326, 2707–2734; P. Heid and T. P. Wihler, On the convergence of adaptive iterative linearized Galerkin methods, Calcolo 57 2020, Paper No. 24] satisfies an energy contraction property in the context of (abstract) strongly monotone problems. This property, in turn, is the crucial ingredient in the recent convergence analysis in [G. Gantner, A. Haberl, D. Praetorius and S. Schimanko, Rate optimality of adaptive finite element methods with respect to the overall computational costs, preprint 2020]. In particular, we deduce that adaptive iterative linearized finite element methods (AILFEMs) lead to full linear convergence with optimal algebraic rates with respect to the degrees of freedom as well as the total computational time
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
Analysis of adaptive meshrefinement methods for a hypersingular integral equation in two dimensions
Full text linkF¨ur die wenigsten partiellen Differentialgleichungen l¨asst sich eine L¨osung in analytisch geschlossener Form darstellen und quantitativ auswerten. Daher bedient man sich numerischer Verfahren, die eine approximative L¨osung auf einem endlichdimensionalen Teilraum berechnen und gleichzeitig gew¨ahrleisten, dass der Fehler in Bezug auf die exakte L¨osung einer gewissen Genauigkeit gen¨ugt.Zu einer der grundlegenden Diskretisierungstechniken zur L¨osung elliptischer partieller Differentialgleichungen geh¨ort neben der Finiten Element Methode die Randelementmethode. Dabei wird die partielle Differentialgleichung unter der Kenntnis der Fundamentall¨osung in eine Integralgleichung ¨ubergef¨uhrt, auf die im n¨achsten Schritt das Galerkin-Verfahren angewandt wird.In dieser Arbeit werden gewisse a posteriori Fehlerabsch¨atzungen f¨ur eine hypersingul¨are Integralgleichung entwickelt. Wir betrachten dabei jene, die der Laplace-Gleichung mit gemischten Randdaten entspringt. Unsere Analysis basiert auf Lokalisierungstechniken f¨ur die Energienorm der Integralgleichung und ¨ubertr¨agt sich somit auf andere hypersingul¨are Integralgleichungen, z.B. auf die Lam´e-Gleichung oder die Stokes-Gleichung
Numerical computation of the magnetic strayfield
Full text linkDiese Arbeit handelt von der numerischen Berechnung des magnetischen Streufelds, welche in vielen Bereichen zur Anwendung kommt.Beispielsweise tritt das Streufeld in der Landau-Lifschitz-Gilbert Gleichung auf, die im Themengebiet Mikromagnetismus eine tragende Rolle spielt. Diese Gleichung wird unter anderem dazu benützt, um Simulationen von magnetischen Bauteilen, wie etwa magnetischen Speichermedien oder magnetischen Sensoren, durchzuführen.Wir werden in dieser Arbeit vier verschiedene Methoden vorstellen, wie das Streufeld berechnet werden kann. Diese Verfahren unterteilen sich dabei in zwei unterschiedliche Typen. Auf der einen Seite stehen die Ansätze von Fredkin & Koehler bzw. Garcia-Cervera & Roma, welche auch hybride FEM-BEM - Kopplungen genannt werden, auf der anderen Seite stehen die symmetrische und direkte FEM-BEM - Kopplungsmethode.Wir werden diese Verfahren analysieren und auch die numerische Umsetzung betrachten. Die getroffenen Aussagen gelten sowohl für den zwei- als auch für den dreidimensionalen Fall.Zum Abschluss führen wir noch einige numerische Experimente durch, welche die Vor- und Nachteile der einzelnen Verfahren zum Vorschein bringen sollen.Hierbei werden wir uns auf den zweidimensionalen Fall beschränken
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
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