7,062 research outputs found
Custo de produção de trigo e de aveia: estimativa safra 2003.
bitstream/CNPT-2010/40476/1/p-co111.pd
Levantamento da ocorrência da podridão parda da haste da soja.
bitstream/item/133628/1/ID10597-1992-1993sojaresultados-p93-97.pdfTrabalho apresentado na XXI de Reunião de Pesquisa de Soja da Região Sul, Santa Rosa, 1993
Canonical transformation for stiff matter models in quantum cosmology
In the present work we consider Friedmann-Robertson-Walker models in the
presence of a stiff matter perfect fluid and a cosmological constant. We write
the superhamiltonian of these models using the Schutz's variational formalism.
We notice that the resulting superhamiltonians have terms that will lead to
factor ordering ambiguities when they are written as operators. In order to
remove these ambiguities, we introduce appropriate coordinate transformations
and prove that these transformations are canonical using the symplectic method.Comment: Revtex4 Class, 3 pages, No Figure
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