Proposta de legenda para o mapeamento do uso e cobertura da terra na bacia hidrográfica do Rio Macacu, RJ.

bitstream/CNPS-2010/14864/1/doc91-2007-prop-legend-rio-macacu.pd

New possibilities for the gauging of chiral bosons

We study a new mechanism for the electromagnetic gauging of chiral bosons showing that new possibilities emerge for the interacting theory of chiral scalars. We introduce a chirally coupled gauge field necessary to mod out the degree of freedom that obstructs gauge invariance in a system of two opposite chiral bosons soldering them together.Comment: 11 pages, Latex. Accepted for publication in Physical Review

Open string with a background B-field as the first order mechanics, noncommutativity and soldering formalism

To study noncommutativity properties of the open string with constant B-field we construct a mechanical action which reproduces classical dynamics of the string sector under consideration. It allows one to apply the Dirac quantization procedure for constrained systems in a direct and unambiguous way. The mechanical action turns out to be the first order system without taking the strong field limit $B\longrightarrow\infty$. In particular, it is true for zero mode of the string coordinate which means that the noncommutativity is intrinsic property of this mechanical system. We describe the arbitrariness in the relation existent between the mechanical and the string variables and show that noncommutativity of the string variables on the boundary can be removed. It is in correspondence with the result of Seiberg and Witten on relation among noncommutative and ordinary Yang-Mills theories. The recently developed soldering formalism helps us to establish a connection between the original open string action and the Polyakov action.Comment: Revtex4, 8 pages. To appear in Physical Review

Phase transition in the 3-D massive Gross-Neveu model

We consider the 3-dimensional massive Gross-Neveu model at finite temperature as an effective theory for strong interactions. Using the Matsubara imaginary time formalism, we derive a closed form for the renormalized $T$-dependent four-point function. This gives a singularity, suggesting a phase transition. Considering the free energy we obtain the $T$-dependent mass, which goes to zero for some temperature. These results lead us to the conclusion that there is a second-order phase transition.Comment: 06 pages, 02 figures, LATE

Uso e cobertura da terra na bacia hidrográfica do rio Guapi - Macacu.

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Avaliação de linhagens de feijoeiro de um programa de seleção recorrente quanto à reação a raça 63-31 de Pseudocercospora griseola.

O objetivo deste trabalho foi avaliar 35 linhagens de feijoeiro oriundas dos sete primeiros ciclos desse programa de seleção recorrente quanto à reação à raça 63-31 de P. griseola, em condições controladas.CONAFE