O pensamento de Che Guevara: um homem novo, trabalho e consciência na Revolução Cubana

Pós-graduação em Ciências Sociais - FFC

A Extrema Esquerda brasileira e a Revolução Cubana (1959-1974)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

De pobres da terra ao movimento sem terra: práticas e representações camponesas no Pontal do Paranapanema - SP

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

The use of the two-body energy to study problems of escape/capture Ernesto Vieira Neto1

The problem of escape/capture is encountered in many problems of the celestial mechanics -the capture of the giants planets irregular satellites, comets capture by Jupiter, and also orbital transfer between two celestial bodies as Earth and Moon. To study these problems we introduce an approach which is based on the numerical integration of a grid of initial conditions. The two-body energy of the particle relative to a celestial body defines the escape/capture. The trajectories are integrated into the past from initial conditions with negative two-body energy. The energy change from negative to positive is considered as an escape. By reversing the time, this escape turns into a capture. Using this technique we can understand many characteristics of the problem, as the maximum capture time, stable regions where the particles cannot escape from, and others. The advantage of this kind of approach is that it can be used out of plane (that is, for any inclination), and with perturbations in the dynamics of the n-body problem. © 2005 International Astronomical Union.

América latina transterritorial: percursos em fronteiras fluidas

Contemporary artists have proposed repositioning of the view as a psicogeographics, routes of drifts, affectives maps, subverting the physical, historical, political and social places in the global mapping. The Chilean artist Eugenio Dittborn with their "Airmail Paintings" that design, sewing, painting and collage are folded and placed in an envelope and sent by post. At your destination, the paint is removed from the envelope, unfolded and hung leaving the marks of the route traveled. The Argentine artist Alicia Herrero in his work "The trip Revoluvionário - title inspired by the trip that Ernesto Guevara held in South America, traveled by navigable rivers of South America and composed the work in the form of a" novel navigated "where each chapter is a port route. As the river of Heraclitus, the writing of "novel navigated" composes processes transposing borders.