8,763 research outputs found
Avaliação fenotípica da produção de biofilmes por estirpes de Staphylococcus aureus isolados de propriedade leiteira.
Edição dos Trabalhos apresentados no V Congresso Latino Americano e XI Congresso Brasileiro de Higienistas de Alimentos, I Encontro Nacional de Vigilância de Zoonoses e Agravos Causados por Animais de Interesse à Saúde Pública, III Encontro do Sistema Brasileiro de Inspeção de Produtos de Origem Animal, Salvador, abr. 2011
Quantization of multidimensional cat maps
In this work we study cat maps with many degrees of freedom. Classical cat
maps are classified using the Cayley parametrization of symplectic matrices and
the closely associated center and chord generating functions. Particular
attention is dedicated to loxodromic behavior, which is a new feature of
two-dimensional maps. The maps are then quantized using a recently developed
Weyl representation on the torus and the general condition on the Floquet
angles is derived for a particular map to be quantizable. The semiclassical
approximation is exact, regardless of the dimensionality or of the nature of
the fixed points.Comment: 33 pages, latex, 6 figures, Submitted to Nonlinearit
Decoherence of Semiclassical Wigner Functions
The Lindblad equation governs general markovian evolution of the density
operator in an open quantum system. An expression for the rate of change of the
Wigner function as a sum of integrals is one of the forms of the Weyl
representation for this equation. The semiclassical description of the Wigner
function in terms of chords, each with its classically defined amplitude and
phase, is thus inserted in the integrals, which leads to an explicit
differential equation for the Wigner function. All the Lindblad operators are
assumed to be represented by smooth phase space functions corresponding to
classical variables. In the case that these are real, representing hermitian
operators, the semiclassical Lindblad equation can be integrated. There results
a simple extension of the unitary evolution of the semiclassical Wigner
function, which does not affect the phase of each chord contribution, while
dampening its amplitude. This decreases exponentially, as governed by the time
integral of the square difference of the Lindblad functions along the classical
trajectories of both tips of each chord. The decay of the amplitudes is shown
to imply diffusion in energy for initial states that are nearly pure.
Projecting the Wigner function onto an orthogonal position or momentum basis,
the dampening of long chords emerges as the exponential decay of off-diagonal
elements of the density matrix.Comment: 23 pg, 2 fi
Profile of sensitivity and resistance of Staphylococcus aureus biofilms producers isolated from cases of mastitis and milking environment.
Demonstração de mecanismo de resistência e da presença de genes diferentes de resistência a Ramularia areola em dois genótipos do algodoeiro.
Avaliação de acessos de melância da região de Irecê-BA quanto a resistência a fungos de solo.
As plantas serão inoculadas através de suspensão aérea de esporos
Desempenho reprodutivo de bovinos na sub-região dos Paiaguas do Pantanal Mato-Grossense. II. Efeito da suplementação mineral sobre índices reprodutivos de novilhas.
Foi estudado o efeito da suplementação mineral sobre o desempenho reprodutivo de novilhas neloradas em pastagem nativa, no Pantanal Mato-Grossense
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