1,721,092 research outputs found
Multi–hump soliton–like structures in interactions of lasers and Bose–Einstein condensates
No full textCo-propagating Bose–Einstein condensates and electromagnetic radiation: formation of mutually localized structures
No full textA semi-classical model is derived for describing the interaction between coherent electromagnetic radiation and a Bose-Einstein condensate in the limit of zero temperature, including the back action of the atoms on the radiation. This model is used to analyse the problem of the self-consistent evolution of a laser beam and a BEC atomic beam. The mutual propagation is studied numerically and demonstrates not only the possibility of a stationary regime of mutual guiding, but also of generating a collapse-like phenomenon
(Counter)Theories and Gender Studies in a Transnational Perspective.
No full textThe volume is interdisciplinary and includes contributes from scholars in the fields of Comparative literature, English studies, Portuguese and Brazilian literature, European studies, Sociology and History, Political Science, Gender studies, Italian literature, Semiotics. This publication is connected to SENT (Network of European Studies), an innovative project including 100 partners from the EU member states. The volume reconsiders the complex issue of “European Identity/ies” and is divided into two parts; the first one investigates it from a diachronic perspective based on a comparative and cultural method. The second section presents case studies and sociological investigations of the European identity/ies today. This essay analyses theoretical issues connected to the recent debates on cultural memory (in cultural and literary studies) and revisits them within a gender perspective. This redefinition of cultural memory is especially re-elaborated starting from the theoretical debates between Europe and the U.S and encompasses both literary studies and critical theories
Introduzione
No full textL'introduzione ripercorre alcune delle questioni teoriche fondamentali sollevate dal rapporto tra letteratura e pittura, e di tale rapporto illustra la complessa e variegata fenomenologia
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
Measuring and engineering entropy and spin squeezing in weakly linked Bose–Einstein condensates
Full text linkWe propose a method to infer the single-particle entropy of bosonic atoms in an optical lattice and to study the local evolution of entropy, spin squeezing and entropic inequalities for entanglement detection in such systems. This method is based on experimentally feasible measurements of non-nearest-neighbour coherences. We study a specific example of dynamically controlling atom tunnelling between selected sites and show that this could potentially also improve the metrologically relevant spin squeezing
- …
