Spin-1 Particles with Light-Front Approach

For the vector sector, i.e, mesons with spin-1, the electromagnetic form factors and anothers observables are calculated with the light-front approach. However, the light-front quantum field theory have some problems, for example, the rotational symmetry breaking. We solve that problem added the zero modes contribuition to the matrix elements of the electromagnetic current, besides the valence contribuition. We found that among the four independent matrix elements of the plus component in the light-front helicity basis only the $0\to 0$ one carries zero mode contributions.Comment: 5 pages. 3 Figures, use latex and EPJ styl

Ephedranthus dimerus (Annonaceae), a new species from the Atlantic Forest of Brazil, with a key to the species of Ephedranthus

A new species of Ephedranthus from the Brazilian Atlantic Forest is described and illustrated, and a preliminary key to the species of Ephedranthus is presented. Ephedranthus dimerus is the only species of the genus from the Atlantic Forest region and the first species of the genus with dimerous flowers. It is similar to E. guianensis in having narrowly obovate to elliptic leaves with similar dimensions and a cuneate to acute base. Nevertheless, the two species can be distinguished from each other by the number of monocarps per fruit and by the length of the stipe

A educação como forma de preservação do patrimônio cultural. Dois exemplo vindos da arqueologia de contrato

The archaeological heritage is little known and appreciated in Brazil, and suffers serious threats by major economic development projects The heritage education is a very important part when dealing with archaeological research, since it builds a link between the archaeologist and the community, providing a more effective heritage protection. This research shows the educational work done in the area to be affected by construction of the Aproveitamento Hidrelétrico (AHE) da Serra do Facão (Goiás – Brazil), and Transmission Line Norte-Sul (Goiás e Tocantins – BrasilEl patrimonio arqueológico es poco conocido y apreciado en Brasil, y sufre de amenazas graves de los grandes proyectos de desarrollo económico. Educación patrimonial es una parte muy importante de la Ela construye un vínculo entre los arqueólogos y comunidad, proporcionando una defensa más efectiva de ese patrimonio. Esta investigación muestra el desarrollo del trabajo educativo realizado en el área a ser afectada por la construcción de la Hidroeléctrica (AHE) Serra do Facão (Goiás – Brasil) por la construcción de la Linea de Transmissión Norte-Sul (Goiás e Tocantins – Brasil)