1,721,089 research outputs found
LONG TIME DYNAMICS OF THE KLEIN-GORDON EQUATION IN THE NON-RELATIVISTIC LIMIT
Full text linkIn this thesis I study the non-relativistic limit () of the nonlinear Klein-Gordon (NLKG) equation on a manifold , namely
where , .
The aim of the present work is to discuss the convergence of solutions of the NLKG to solutions of a suitable nonlinear Schr\"odinger (NLS) equation, and to study whether such convergence may hold for large (namely, of size with ) timescales.
In particular I obtain the following results: (1) when is a general manifold, I show that the solution of NLS describes well the solution of the original equation up to times of order \cO(1); (2) when ,, I consider higher order approximations of NLKG and prove that small radiation solutions of the approximating equation describe well solutions of NLKG up to times of order for any ; (3) when I consider the NLKG equation with aconvolution potential and prove existence for long times of solutionsin uniformly in , which however has to belong to a set of large measure.
I also get some new dispersive estimates for a Klein-Gordon type equation with a potential
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
Transitional Memories. Views on the evolution of the coastal landscape in Liguria
No full textThe geography of tourism in Liguria is closely connected to the infrastructural development of the coast which over time has determined the evolution of landscapes and movements, an epitome of the Mediterranean. From the Grand Tour to the discovery of the first seaside resorts; from the development of the coastal railway to the promotion of the Ligurian Riviera as a holiday destination; from the urban sequences stretching along the lines of the viaducts and the coast, to the speculation of mass tourism and second homes. Palimpsest of flows and traces with the ability to metabolize and to increase its form, despite everything, up to saturation. Travel as a method for capturing precise explorations of a territory as an archipelago. Today the Ligurian hyper-city represents a research focus with a double-step vision: to study the new settlement migrations and the reinvention of the coastal public space, as an attraction and continuity element capable of triggering design solutions for different approach to tourism issues
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
Tusculum. Luigi Canina e la riscoperta di un'antica città
No full textDell'attività dell'architetto e archeologo Luigi Canina al Tuscolo, l'autore ha curato la parte relativa alle pubblicazioni antiquarie e ai progetti di sistemazione della residenza dei committenti
Lo Spirito dell'Addizione. Una lezione di Vittorio Savi.
No full textLa pubblicazione è stata promossa dal Dipartimento di Architettura dell’Università degli Studi di Ferrara, a cura di Rita Fabbri, Marco Mulazzani e Susanna Pasquali. La lezione di Vittorio Savi, tenuta presso la Facoltà di Architettura di Ferrara il 13 giugno 2006, è stata raccolta da Ramona Loffredo che ha curato la trascrizione e la redazione delle note
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