Uso de fosfato natural no cultivo de arroz, soja e milho em rotação, no sistema plantio direto.

bitstream/item/43871/1/boletim-20.pd

Duality Symmetry in the Schwarz-Sen Model

The continuous extension of the discrete duality symmetry of the Schwarz-Sen model is studied. The corresponding infinitesimal generator $Q$ turns out to be local, gauge invariant and metric independent. Furthermore, $Q$ commutes with all the conformal group generators. We also show that $Q$ is equivalent to the non---local duality transformation generator found in the Hamiltonian formulation of Maxwell theory. We next consider the Batalin--Fradkin-Vilkovisky formalism for the Maxwell theory and demonstrate that requiring a local duality transformation lead us to the Schwarz--Sen formulation. The partition functions are shown to be the same which implies the quantum equivalence of the two approaches.Comment: 10 pages, latex, small changes, final version to appear in Phys. Rev.

Scent from Cattleya wallisii, an Orchid from the Amazon.

ISEO. PP117. 9 a 12 de set

Fosfatos Naturais na Adubação de Sistema de Culturas de Verão com Ênfase no Arroz Irrigado.

bitstream/item/30829/1/Circular-66.pd

A água: distribuição, regulamentação e uso na agricultura, com enfase ao arroz irrigado.

bitstream/item/45267/1/documento-250.pd