Plane Gravitational Radiation from Neutrinos Source with Kalb-Ramond Coupling

In this work, we propose a model based on a non-minimal coupling of neutrinos to a Kalb-Ramond field. The latter is taken as a possible source for gravitational radiation. As an immediate illustration of this system, we have studied the case where gravitational (plane) wave solutions behave as damped harmonic oscillators.Comment: Presented at 7th Alexander Friedmann International Seminar on Gravitation and Cosmology, Joao Pessoa, Brazil, 29-05 Jul 200

Dilatonic, Current-Carrying Cosmic String

We study the implications of a scalar-tensorial gravity for the metric of an isolated self-gravitating superconducting cosmic string. These modifications are induced by an arbitrary coupling of a massless scalar field to the usual tensorial field in the gravitational Lagrangian. We derive the metric in the weak-field approximation and we analyse the behaviour of light in this spacetime. We end with some discussions.Comment: 12 pp, Latex, no figures, based on a talk given by M. E. X. Guimaraes at the COSMO 99, 27/9 to 02/10/99, ICTP, Trieste, I

Global-String and Vortex Superfluids in a Supersymmetric Scenario

The main goal of this work is to investigate the possibility of finding the supersymmetric version of the U(1)-global string model which behaves as a vortex-superfluid. To describe the superfluid phase, we introduce a Lorentz-symmetry breaking background that, in an approach based on supersymmetry, leads to a discussion on the relation between the violation of Lorentz symmetry and explicit soft supersymmetry breakings. We also study the relation between the string configuration and the vortex-superfluid phase. In the framework we settle down in terms of superspace and superfields, we actually establish a duality between the vortex degrees of freedom and the component fields of the Kalb-Ramond superfield. We make also considerations about the fermionic excitations that may appear in connection with the vortex formation.Comment: 9 pages. This version presented the relation between Lorentz symmetry violation by the background and the appearance of terms that explicitly break SUS

A note on nano-photovoltaic panels emergence in energy market

Nanotechnology may work as a powerful weapon to be used for creating competitive advantages in the energy market. Through the use of photovoltaic nano-panels, which may reduce considerably production costs and simultaneously meet socioenvironmental requirements demanded by law. It is a way to produce clean energy in innovative terms. Moreover, today the adoption of nanotechnology in energy production can in turn make this kind of energy quite interesting through time. Nanotechnology may be responsible for considerable economic and environmental gains.info:eu-repo/semantics/publishedVersio

Desenvolvimento de grãos em dois genótipos de milho sob manejo diferenciado de irrigação e adubação.

xEdição de resumos do 7º Congresso Brasileiro de Fisiologia Vegetal, Brasília, 1999

Produção e composição bromatológica do capim sudão e de seus híbridos (BRS 800 e AG 2501) com 42 E 56 dias.

Um experimento foi conduzido com o objetivo de avaliar a produtividade e composicao bromatologica do capim Sudao e os seus hibridos com o sorgo (BRS 800 e Ag 2501) colhidos aos 42 e 56 dias de crescimento. O delineamento foi blocos casualizados com tres repeticoes. Aos 42 dias todas plantas estavam no estadio vegetativo e aos 56 dias observou-se 38,5; 78,3 e 46,8% de floracao do capim Sudao, BRS 800 e Ag 2501, respectivamente. A producao (kg) de materia seca por hectare para o capim Sudao, BRS 800 e AG 2501 foram: 3,56; 4,18 e 4,43; respectivamente, sendo a do AG 2501 superior (P0,05) a do BRS 800. Os teores (%) de materia seca, FDN e FDA foram semelhantes (P>0,05) para os tres cultivares , sendo 13,49; 70,26 e 40,72 respectivamente. O teor de proteina bruta do BRS 800 (11,00%) foi superior (P0,05) ao do capim Sudao. A producao de materia seca (t/ha), teores (%) de materia seca, proteina bruta e FDN foram diferentes (P0,05)