1,720,979 research outputs found
International Workshop Analytic and geometric theory of the Camassa-Holm equation and integrable systems (Bologna, 22-25 September 2004).
No full textThe workshop was held at CIRAM as part of the GNFM-INdAM research program "Onde nonlineari, struttura tau e geometria delle varietà invarianti: il caso della gerarchia di Camassa-Holm". The workshop was also partially supported by ESF research program MISGAM (Method of Integrable Systems, Geometry and Applied Mathematics). About 30 researchers presented their recent achievements in the theory of integrable systems with special attention to topics related to the CH hierarchy and its generalizations.
Scientific Committee: S. Abenda (Bologna), B. Dubrovin (SISSA), G. Falqui (SISSA), T. Grava (SISSA).
Organizing Committee: S. Abenda (Bologna), T. Grava (SISSA).
Invited speakers: R. Camassa (Chapel Hill), G. Carlet (Cambridge),
A. Constantin (Trinity College, Dublin), B. Dubrovin (SISSA), Yu. Fedorov (UPC-Spain), D. Holm (IC London), A. Hone (University of Kent at Canterbury), P. Lorenzoni (Milano Bicocca), F. Magri (Milano Bicocca), F. Musso (Rome III), M. Pedroni (Genova), J. Prada (University of Salamanca), O. Ragnisco (Rome III), V. Sokolov (Moscow), A. Shabat (Moscow and Roma III), Y. Zhang (Tsinghua U. Beijing)
Conference on Riemann-Hilbert Problems, Integrability and Asymptotics
No full textA Conference on Riemann-Hilbert Problems, Integrability and Asymptotics is being organized at SISSA within the activities of the Marie Curie FP6 RTN ENIGMA (European Network In Geometry, Mathematical Physics and Applications), the ESF Research Programme MISGAM (Methods of Integrable Systems in Geometry and Applied Mathematics), in collaboration with the Italian MIUR 2004 research project Geometrical Methods in the Theory of Nonlinear Waves and Applications, run by the SISSA Mathematical Physics Sector.
Riemann Hilbert problems and asymptotic expansions lie at the crossroads of the three main research areas of the ENIGMA network and of the MISGAM project: Geometry, Integrable Systems, and Applications. The aim of the Trieste Conference is to establish the state of the art in this interdisciplinary, historically deeply rooted but still extremely lively subject, as well as point out new directions of research.
Participants: J. Arnlind (Stokholm), O. Babelon (Paris), A. Bobenko (Berlin), G. Carlet (Cambridge), A. Cattaneo (Zürich), Y. Chen (London), T. Claeys (Leuwen), D. Crowdy (London), E. Daems (Leuwen), M. Duits (Leuwen), M. Dunajski (Cambridge), P. Elbau (Zürich), Y. Fedorov (Barcelona), E. Ferapontov (Loughborough), T. Fokas (Cambridge), P. Garcia-Estevez (Salamanca), J. Gibbons (IC, London), M. Hallnas (Stocholm), C. Hertling (Mannheim), I. Hitzazis (Patra), A. Hone (Kent), J. Hoppe (Stockolm), T. Ikeda (Okayama), S. Kamvissis (Greece), V. Kazakov (Paris), G. Khimshiashvili (Tbilisi), C. Klein (Leipzig). B. Konopelchenko (Lecce), A. Kuijlaars (Leuwen), R. Ivanov (Dublin), P. Lorenzoni (Milano), E. Loubet (Zurich), M. Manas (Madrid), J. Marshall (London), L. Martinez-Alonso (Madrid), L. Mason (Oxford), M. Mazzocco (Manchester), P. van Moerbeke (Louvain), Y. Morita (Kiryu), A. Moro (Lecce), F. Musso (Roma), S.P. Novikov (Maryland), V. Novokshenov (Ufa), A. Panasyuk (Warsaw), J. Prada (Salamanca), O. Ragnisco (Roma), M. Saito (Kobe), L. Samaj (Bratislava), P. Santini (Rome), V. Shramchenko (Bonn), F. Smirnov (Paris), V. Spiridonov (Dubna), I. Strachan (Glasgow), Y. Suris (Munich), K. Takasaki (Kyoto), K. Takemura (Yokohama), K. Toda (Toyama), C. Tracy (Davis), M. Vanlessen (Leuwen), A. Veselov (Loughborough), S. West (Cambridge), J-B. Zuber (Paris).
Organizing Committee: S. Abenda, B. Dubrovin, G. Falqui, T. Grava.
Sponsors: ESF programme MISGAM, European RTN network ENIGMA, SISSA - Scuola Internazionale Superiore di Studi Avanzati and Italian MIUR Research Project "Geometrical Methods in the theory of Nonlinear Waves and Applications".
Registration and Financial Support: Please register for the conference with the online registration form. Limited partial financial support is available. Priority will be given to young researchers working in Europe. Deadline for application for financial support: 5th of June 2005.
The day of arrival will be September 19th (Monday), and the day of departure September 25th (Sunday). The working days of the Workshop are September 20th through 24th
Reciprocal transformations and flat metrics on Hurwitz spaces
No full textWe consider hydrodynamic systems which possess a local Hamiltonian structure. To such a system there are
also associated an infinite number of nonlocal Hamiltonian
structures. We give necessary and sufficient conditions so that, after a nonlinear transformation of the independent variables, the reciprocal system still possesses a local Hamiltonian structure. We show that, under our hypotheses, bi--hamiltonicity is preserved by the reciprocal transformation. Finally we apply such results to
reciprocal systems of genus g Whitham-KdV modulation equations
Modulation of the Camassa-Holm equation and reciprocal transformations
Full text linkThe authors derive the modulation equations for the one-phase periodic solution of the Camassa-Holm (CH) equation by using a Lagrangian formalism. Following the method of Haynes and Whitham, the modulation equations are shown to be Hamiltonian with a local Poisson bracket of Dubrovin-Novikov type. Subsequently, the modulation equations are rewritten in Riemann-invariant form and are shown to be hyperbolic. The authors then investigate the bi-Hamiltonian structure and the integration of the one-phase Whitham equations in Riemann-invariant form. Finally, in the last section, the authors show that the modulation equations of the CH equation are transformed to the modulation equations of the first negative KdV flow by the average of the reciprocal transformation which links the two equations
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
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
- …
