1,721,070 research outputs found
Wave-Breaking and Dispersive Shock Wave Phenomena in Optical Fibers
No full textWe review the models and the experiments on wave-breaking and dispersive shock phenomena occurring in optical fiber
Instabilités optiques dans les fibres a dispersion oscillante
No full textLes fibres optiques ont depuis plusieurs décennies constitué une plate-forme d'étude
expérimentale privilégiée des structures cohérentes non-linéaires (solitons, similaritons,
breathers de Peregrine,...) et de différents processus d'instabilité. En effet, sous l'interaction
de la dispersion du second ordre et de la non-linéarité Kerr de la silice, l'évolution du champ
optique peut être modélisée par l'équation de Schrödinger non-linéaire
Ballistic dispersive shock waves in optical fibers
No full textWe demonstrate a ballistic dispersive shock wave in optical fibers induced by cross-phase modulation on a CW landscape. The shock is characterized by a total depletion of the central part surrounded by repulsive oscillating fronts
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
Modulation Instability, Four-Wave Mixing and their Applications
No full textWe review the phenomena of modulational instability and parametric frequency conversion due to four-wave mixing and related applications in optical fiber
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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