1,721,057 research outputs found
On -Algebras associated to Horocycle Flows
Full text linkThis thesis is mainly concerned with the study of the crossed product -algebras associated to the horocycle flow on compact quotients of \SL(2,\rr). Looking at the Cuntz semigroup, we retrieve some information about the structure of hereditary -subalgebras and Hilbert modules for a class of -algebras which contain the -algebras we want to study. After translating these results in our context, we study the functoriality of the construction both for the case of discrete subgroups of \SL(2,\rr) and for the case of hyperbolic Riemann surfaces. Also properties of another crossed product -algebra that is Morita equivalent to the -algebra of the horocycle flow are explored and from considerations about the associated dynamical system we can prove that the multiplier algebra of the crossed product -algebra associated to the horocyce flow contains a Kirchberg algebra in the UCT class as a unital -subalgebra in some cases.\\
A side chapter is devoted to a project that the author started during his PhD, concerning the construction of spectral triples on the Jiang-Su algebra. The construction we give is performed by means of a particular -embedding
La storia con gli occhi dei tifosi
Full text linkLa storia dello sport ha conosciuto negli ultimi anni un fiorire di studi oltre che una rinnovata legittimazione in ambito accademico e non. Alcuni fenomeni, come quello delle tifoserie sono progressivamente divenuti oggetto di indagine storica: molti aspetti sono perciò stati presi in esame. Quello che ancora manca è un 'analisi di come i tifosi hanno utilizzato, riprodotto e risignificato la narrazione della storia.The history of sport has experienced a flourishing of studies in recent years as well as a renewed legitimacy in the academic and non-academic fields. Some phenomena, such as that of sporting fandom, have gradually become the subject of historical investigation: many aspects have therefore been taken into consideration. What is still missing is an analysis of how the fans have used, reproduced and re-signified the narrative of the story
Spectral triples on the Jiang-Su algebra
Full text linkWe construct spectral triples on a class of particular inductive limits of
matrix-valued function algebras. In the special case of the Jiang-Su algebra we
employ a particular -embedding
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
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