1,721,256 research outputs found
Dimensional reduction of Courant sigma models and Lie theory of Poisson groupoids
No full textWe show that the 2d Poisson Sigma Model on a Poisson groupoid arises as an
effective theory of the 3d Courant Sigma Model associated to the double of the
underlying Lie bialgebroid. This field-theoretic result follows from a
Lie-theoretic one involving a coisotropic reduction of the odd cotangent bundle
by a generalized space of algebroid paths. We also provide several examples,
including the case of symplectic groupoids in which we relate the symplectic
realization construction of Crainic-Marcut to a particular gauge fixing of the
3d theory.Comment: 37 page
A generalized Montgomery phase formula for rotating self-deforming bodies
Get PDFWe study the motion of self-deforming bodies with non-zero angular momentum when the changing shape is known as a function of time. The conserved angular momentum with respect to the center of mass, when seen from a rotating frame, describes a curve on a sphere as happens for the rigid body motion, though obeying a more complicated non-autonomous equation. We observe that if, after time , this curve is simple and closed, the deforming body’s orientation in space is fully characterized by an angle or phase θM. We also give a reconstruction formula for this angle which generalizes R. Montgomery’s well known formula for the rigid body phase. Finally, we apply these techniques to obtain analytical results on the motion of deforming bodies in some concrete examples.Fil: Cabrera, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Matemáticas; Argentin
El análisis del sistema de relaciones laborales en Uruguay en el período 2005-2012, a partir del enfoque estratégico (strategic choice)
Get PDFEl argumento central de la ponencia consiste en la descripción y análisis de las características del modelo de negociación colectiva uruguayo. Podemos adelantarnos en nuestras consideraciones y plantear que a partir del año 2005, con la asunción del Frente Amplio en el gobierno nacional este hecho político provocó cambios en los diversos ámbitos de las relaciones entre los distintos actores institucionales vinculados al ámbito del trabajo. El enfoque estratégico será la teoría de referencia con la cual nos explayaremos respecto a la caracterización actual del sistema de relaciones laborales uruguayo.Fil: Vignolo Cabrera, Alejandro Serafín. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Saavedra 15. Centro de Estudios e Investigaciones Laborales; ArgentinaVI Jornadas de Economía Crítica: Economía política y política económicaMendozaArgentinaUniversidad Nacional de Cuyo. Facultad de Ciencias Económica
Las Políticas Activas de Empleo en el Uruguay "progresista": Análisis del período 2005-2015
Get PDFEsta ponencia tiene por objetivo analizar la política laboral del Frente Amplio en Uruguay en el período 2005-2015, teniendo como eje las acciones llevadas a cabo en materia de Políticas Activas de Empleo por el Ministerio de Trabajo y Seguridad Social; enfatizando lo actuado en relación al programa Centros Públicos de Empleo. Los objetivos propuestos,tendrán como línea teórica argumentativa el concepto de ?socialdemocracias tardías? del Dr. Lanzaro.La elección de investigar este tema en particular, surge a partir del interés de poder aplicar al campo académico la experiencia profesional desarrollada en la Dirección Nacional de Empleo del Ministerio de Trabajo y Seguridad Social de Uruguay. En un segundo orden, se busca contribuir al desarrollo de estos temas en el ámbito de la Ciencia Política uruguaya. Por último, partimos del supuesto que el Frente Amplio, organización política con lazos de afinidad histórica con las principales organizaciones sociales del país y especialmente con las obreras, pudo otorgarle una impronta distinta a sus políticas de empleo en comparación a gobiernos de otro tinte ideológico de la década de 1990 ycomienzos del 2000. Por lo que en la siguiente ponencia tenemos como premisa remarcar cuánto podemos hablar de ?ruptura? o de continuidad en materia laboral y de empleo con los gobiernos anteriores.Fil: Vignolo Cabrera, Alejandro Serafín. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Saavedra 15. Centro de Estudios e Investigaciones Laborales; Argentina9° Congreso Latinoamericano de Ciencia Política: "¿Democracias en recesión?"MontevideoUruguayAsociación Latinoamericana de Ciencia Polític
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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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