2012
Autores
Carvalho, MI; Facao, M;
Publicação
PHYSICS LETTERS A
Abstract
The effects of third-order dispersion (TOD) and intrapulse Raman scattering (IRS) on the erupting solitons of the complex cubic-quintic Ginzburg-Landau equation are investigated by direct numerical simulations and linear stability analysis. Our results indicate that positive TOD eliminates eruptions on the leading edge of the soliton, whereas negative TOD cancels them on the other side. Moreover, the combined action of TOD and IRS is in certain cases able to eliminate explosions on both sides of the soliton, at much lower IRS values than with IRS alone. The profiles of the stationary solutions are increasingly asymmetric with TOD, and their velocity varies almost linearly with IRS. (C) 2012 Published by Elsevier B.V.
2012
Autores
Fernandes, G; Facao, M; Carvalho, MI; Rodrigues, S; Heidarialamdarloo, J; Pinto, AN; Ferreira, MF;
Publicação
NONLINEAR OPTICS AND APPLICATIONS VI
Abstract
The supercontinum generation has been achieved mainly by two different approaches, namely, with femtosecond intense pulses or using a continuous wave laser or larger pulses centered on the anomalous dispersion region. In order to improve temporal coherence, it has been suggested the introduction of a pulse seed or the propagation of both a large pulse pump and a small weaker continuous wave to control the soliton fission. Here we propose supercontinuum generation using a hybrid input, we pump with a continuous laser and copropagate a picosecond signal. We compare the bandwidth of the supercontinuum using only the continuous pump or the hybrid setup. Simulations of the generalized Schrodinger equation, using an adequate input-noise model to reproduce the spectrum of the continuous signal, are performed in order to investigate the supercontinuum generation in the optical communication window under different dispersion regimes.
2012
Autores
Brandao, D; Martins, N; Alvelos, H;
Publicação
Design Journal
Abstract
In this paper we will maintain that cultural institutions are increasingly facing the inevitability of a profound revision in their traditional parameters of unidirectional communication. Given the increasing availability of tools for audiovisual production as well as the diversity of networked communication contexts, the roles of the user and the audience have come to assume a participatory potential in the content they consume and attend; this will dictate their repositioning in relation to the universe of institutions' work. In order to communicate new messages, media narratives, views or perspectives on the same reality are constantly constructed, deconstructed and reconstructed. In this age of 'Consumer- Generated Media', identities and representations are constantly changing. The idea and the concept of a brand now extends far beyond its own limits, taking on important emotional values, and people enjoy being a part of that brand's mythology. The Serralves Foundation, along with its Museum of Contemporary Art, in Porto, Portugal, was the subject of a first study of an empirical nature: a series of audio-visual objects were developed, in order to generate material for analysis and proposition. In this subsequent stage, we aim at the identification of new procedures and practices that may be effectively implemented within the institutional universe. We intend to establish more efficient communication contexts, including the maximizing of a set of relationships between institutions and audiences regarding dimensions that are traditionally outside the institutional radar: identity, narrative and affection. By referring to key examples, we will posit that in order to achieve more success in their missions, cultural institutions should focus on participatory education and communication processes regarding contemporary issues. By doing this, they will strengthen their engagement with their audiences and bring them into the institutions' projects. This project is currently undertaking a wide inventory and taxonomy of the various institutional paradigms in regards to communication practices. We aim at producing a map of vocations and positions within the institutional world in regards to the aforementioned issues that require participatory communication. © Berg 2012 Printed In The UK.
2012
Autores
Alvelos, H;
Publicação
DESIGN JOURNAL
Abstract
2012
Autores
Brandao, D; Martins, N; Alvelos, H;
Publicação
DESIGN JOURNAL
Abstract
In this paper we will maintain that cultural institutions are increasingly facing the inevitability of a profound revision in their traditional parameters of unidirectional communication. Given the increasing availability of tools for audiovisual production as well as the diversity of networked communication contexts, the roles of the user and the audience have come to assume a participatory potential in the content they consume and attend; this will dictate their repositioning in relation to the universe of institutions' work. In order to communicate new messages, media narratives, views or perspectives on the same reality are constantly constructed, deconstructed and reconstructed. In this age of 'Consumer-Generated Media', identities and representations are constantly changing. The idea and the concept of a brand now extends far beyond its own limits, taking on important emotional values, and people enjoy being a part of that brand's mythology. The Serralves Foundation, along with its Museum of Contemporary Art, in Porto, Portugal, was the subject of a first study of an empirical nature: a series of audio-visual objects were developed, in order to generate material for analysis and proposition. In this subsequent stage, we aim at the identification of new procedures and practices that may be effectively implemented within the institutional universe. We intend to establish more efficient communication contexts, including the maximizing of a set of relationships between institutions and audiences regarding dimensions that are traditionally outside the institutional radar: identity, narrative and affection. By referring to key examples, we will posit that in order to achieve more success in their missions, cultural institutions should focus on participatory education and communication processes regarding contemporary issues. By doing this, they will strengthen their engagement with their audiences and bring them into the institutions' projects. This project is currently undertaking a wide inventory and taxonomy of the various institutional paradigms in regards to communication practices. We aim at producing a map of vocations and positions within the institutional world in regards to the aforementioned issues that require participatory communication.
2012
Autores
M.B., J; M., L; Coelho, D; M., H; C.S., J;
Publicação
Ultra Wideband - Current Status and Future Trends
Abstract
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