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Resonant delocalization in Random Schrödinger operators
No full textNon UBCUnreviewedAuthor affiliation: TU MunichFacult
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Transport in Multi-Dimensional Random Schrödinger Operators
Full text linkRandom Schrödinger operators are a topic of common interest i
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
Hierarchische Zufallsmatrizen und Operatoren
Full text linkWe consider three hierarchical random matrices and operators. First, we implement a renormalization group for the hierarchical Anderson model to prove dynamical localization and Poisson statistics in all spectral dimensions. Next, we study the local stability of Dyson Brownian motion to map out the entire localized phase of the ultrametric ensemble in terms of both eigenfunctions and local statistics. Finally, we study the characteristics of a certain stochastic advection equation to prove the existence of a hitherto conjectured non-ergodic phase in the Rosenzweig-Porter model.Wir betrachten drei hierarchische Zufallsmatrizen und Operatoren. Zuerst implementieren wir eine Renormierungsgruppe für das hierarchische Anderson-Modell, um dynamische Lokalisierung und Poisson-Statistik in allen spektralen Dimensionen zu beweisen. Dann untersuchen wir die lokale Stabilität der Dyson-Brown’schen Bewegung, um das gesamte Lokalisierungsregime des ultrametrischen Ensembles abzubilden. Schließlich betrachten wir die charakteristischen Kurven einer bestimmten stochastischen Transportgleichung, um die Existenz einer bisher vermuteten nicht-ergodischen Phase im Rosenzweig-Porter-Modell zu beweisen
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
Transport in Multi-Dimensional Random Schrödinger Operators
No full textRandom Schrödinger operators are a topic of common interest i
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