Technological change and opportunities for development as a moving target

Includes bibliography

Black holes in realistic branes: Black string-like objects?

A realistic model describing a black string-like object in an expanding Universe is analyzed in the context of the McVittie's solution of the Einstein field equations. The bulk metric near the brane is provided analogously to previous solutions for black strings. In particular, we show that at least when the Hubble parameter on the brane is positive, a black string-like object seems to play a fundamental role in the braneworld scenario, generalizing the standard black strings in the context of a dynamical brane. © 2013 Elsevier B.V.

An analysis of the Hygiea asteroid family orbital region

(10) Hygiea is the fourth largest asteroid of the main belt, by volume and mass, and it is the largest member of its family, that is made mostly by low-albedo, C-type asteroids, typical of the outer main belt. Like many other large families, it is associated with a 'halo' of objects, that extends far beyond the boundary of the core family, as detected by traditional hierarchical clustering methods (HCM) in proper element domains. Numerical simulations of the orbital evolution of family members may help in estimating the family and halo family age, and the original ejection velocity field. But, in order to minimize the errors associated with including too many interlopers, it is important to have good estimates of family membership that include available data on local asteroid taxonomy, geometrical albedo and local dynamics. For this purpose, we obtained synthetic proper elements and frequencies of asteroids in the Hygiea orbital region, with their errors. We revised the current knowledge on asteroid taxonomy, including Sloan Digital Sky Survey-Moving Object Catalog 4th release (SDSS-MOC 4) data, and geometric albedo data from Wide-field Infrared Survey Explorer (WISE) and Near-Earth Object WISE (NEOWISE). We identified asteroid family members using HCM in the domain of proper elements (a, e, sin (i)) and in the domains of proper frequencies most appropriate to study diffusion in the local web of secular resonances, and eliminated possible interlopers based on taxonomic and geometrical albedo considerations. To identify the family halo, we devised a new hierarchical clustering method in an extended domain that includes proper elements, principal components PC1, PC2 obtained based on SDSS photometric data and, for the first time, WISE and NEOWISE geometric albedo. Data on asteroid size distribution, light curves and rotations were also revised for the Hygiea family. The Hygiea family is the largest group in its region, with two smaller families in proper element domain and 18 families in various frequencies domains identified in this work for the first time. Frequency groups tend to extend vertically in the (a, sin (i)) plane and cross not only the Hygiea family but also the near C-type families of Themis and Veritas, causing a mixture of objects all of relatively low albedo in the Hygiea family area. A few high-albedo asteroids, most likely associated with the Eos family, are also present in the region. Finally, the new multidomains hierarchical clustering method allowed us to obtain a good and robust estimate of the membership of the Hygiea family halo, quite separated from other asteroids families halo in the region, and with a very limited (about 3 per cent) presence of likely interlopers. © 2013 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society.

Eliminating ambiguities for quantum corrections to strings moving in AdS4×CP3

We apply a physical principle, previously used to eliminate ambiguities in quantum corrections to the two-dimensional kink, to the case of spinning strings moving in AdS4×CP3, thought of as another kind of two-dimensional soliton. We find that this eliminates the ambiguities and selects the result compatible with AdS/CFT, providing a solid foundation for one of the previous calculations, which found agreement. The method can be applied to other classical string «solitons.» © 2013 World Scientific Publishing Company.

Dynamical properties for an ensemble of classical particles moving in a driven potential well with different time perturbation

We consider dynamical properties for an ensemble of classical particles confined to an infinite box of potential and containing a time-dependent potential well described by different nonlinear functions. For smooth functions, the phase space contains chaotic trajectories, periodic islands and invariant spanning curves preventing the unlimited particle diffusion along the energy axis. Average properties of the chaotic sea are characterised as a function of the control parameters and exponents describing their behaviour show no dependence on the perturbation functions. Given invariant spanning curves are present in the phase space, a sticky region was observed and show to modify locally the diffusion of the particles. © 2013 Elsevier B.V.

Export commodity price projections: a study of autoregressive-moving average projections methods: preliminary version

Includes bibliography

Mídias e jogos: do virtual para uma experiência corporal educativa

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Transport, the poor and moving towards low-carbon societies

This FAL Bulletin discusses the challenges involved in creating equality in urban mobility and the need to reach towards a social sustainability framework, as existing policies often accentuate current inequities and inequalities in accessibility. Lack of access to mobility has wide-ranging effects across social groups, gender and particularly the urban poor.

The carbon footprint of ECLAC subregional headquarters for the Caribbean: Moving towards a climate neutral strategy

.--I. Introduction.--II. Methodology for estimating greenhouse gas emissions.--III. The carbon footprint of ECLAC- Port-of-Spain.--IV. Reducing greenhouse gas emissions: next steps

Palavra e imagem: encontros da escritura literária com escritura cinematográfica

Este trabalho se apresenta como uma abordagem da palavra e da imagem e suas possibilidades de encontros em textos literários e cinematográficos a partir da noção de escritura. Sua construção se dá de modo a não seguir um percurso histórico destes encontros, no sentido de não fazer exatamente levantamentos cronológicos de termos ou correntes que abordassem o texto literário e cinematográfico enquanto escritura de imagens, mas sim pela perspectiva de sua inscrição como imagem mental. Neste aspecto, a leitura e escritura se dão como tradução, passagem e passeio de sentidos que o texto produz, não enclausurando uma sua percepção ancorada em uma compreensão fechada. Tomando a escritura como ponto de partida para a leitura da imagem e da palavra em textos literários e cinematográficos, parte-se para uma discussão de tópicos da teoria e crítica em amplas vertentes, privilegiando uma organização transversal deste material que parte de um conjunto de teoria de forte marcação transdisciplinar, promovendo também um encontro de campos da Teoria Literária com as Artes Visuais, Cinema, Vídeo, Pintura, Filosofia, História, entre outros. A noção de escritura adotada neste trabalho tornou importante tecer algumas considerações a partir de certas ideias de Roland Barthes e Jacques Derrida, entre outros estudiosos e comentadores do termo. Outro termo que atravessa o trabalho é a noção de tradução, aqui tomadas a partir da leitura de autores como Márcio Seligmann-Silva, Walter Benjamin, Jacques Derrida, Paul Valery, entre outros. As distinções destes termos não se devem a um esforço para delimitar os espaços dos campos de estudos, mas sim para afirmar justamente uma sua perspectiva de abertura, ou de aberturas, além do que há o entendimento de que a filiação a certos pensamentos, teorias e autores já configuram a marcação de um lugar do pensamento, lugar político, inclusive. A opção por estas concepções imprime nos corpos dos objetos de estudo, a escritura literária e a cinematográfica, uma diferença bem mais de acordo com o caráter dinâmico e movente destes objetos, produzindo um redimensionamento teórico de forte marcação política. Também interessa neste trabalho discutir tópicos dos estudos literários de maneira a permitir o atravessamento pelas outras disciplinas. A partir destas linhas gerais, o trabalho se completou com leituras de textos literários e cinematográficos, textos estes de forte caráter plural em que o encontro entre a imagem e a palavra é promovido pela escritura, constituindo também um encontro entre as teorias e as modalidades artísticas, primando por um atravessamento das teorias e pensamentos desenvolvidos ao longo da escritura do trabalho, em um tratamento ensaístico e de forte marcação intertextual, fazendo destas leituras um exercício de abertura dos textos.

Desenvolvimento de um sistema moving cameras para reconstrução 3D de movimentos submersos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)