Dinâmica do agronegócio brasileiro da melancia: produção, consumo e comercialização.

bitstream/CNPH-2009/34420/1/ct_42.pd

On the nonlinearity interpretation of q- and f-deformation and some applications

q-oscillators are associated to the simplest non-commutative example of Hopf algebra and may be considered to be the basic building blocks for the symmetry algebras of completely integrable theories. They may also be interpreted as a special type of spectral nonlinearity, which may be generalized to a wider class of f-oscillator algebras. In the framework of this nonlinear interpretation, we discuss the structure of the stochastic process associated to q-deformation, the role of the q-oscillator as a spectrum-generating algebra for fast growing point spectrum, the deformation of fermion operators in solid-state models and the charge-dependent mass of excitations in f-deformed relativistic quantum fields.Comment: 11 pages Late

Soft singularity and the fundamental length

It is shown that some regular solutions in 5D Kaluza-Klein gravity may have interesting properties if one from the parameters is in the Planck region. In this case the Kretschman metric invariant runs up to a maximal reachable value in nature, i.e. practically the metric becomes singular. This observation allows us to suppose that in this situation the problems with such soft singularity will be much easier resolved in the future quantum gravity then by the situation with the ordinary hard singularity (Reissner-Nordstr\"om singularity, for example). It is supposed that the analogous consideration can be applied for the avoiding the hard singularities connected with the gauge charges.Comment: 5 page

Estabilidade do carbono presente na cama de frango e em seu respectivo biocarvão após aplicação no solo.

Resumo: A pesquisa teve como objetivo geral avaliar a degradação do carbono de biocarvão obtido a partir de cama de frango e determinar o efeito na capacidade de troca de cátions do solo. A aplicação do biocarvão de cama de frango como insumo é interessante para uso na agricultura, pois tem potencial para aumentar a CTC do solo e fornecer P às plantas, o que torna esse material bastante interessante para uso no solo em função do exposto e devido a outros benefícios como correção da acidez do solo, redução do Al tóxico, aumento do teor disponível de outros nutrientes e sequestro de carbono

Geometry, stochastic calculus and quantum fields in a non-commutative space-time

The algebras of non-relativistic and of classical mechanics are unstable algebraic structures. Their deformation towards stable structures leads, respectively, to relativity and to quantum mechanics. Likewise, the combined relativistic quantum mechanics algebra is also unstable. Its stabilization requires the non-commutativity of the space-time coordinates and the existence of a fundamental length constant. The new relativistic quantum mechanics algebra has important consequences on the geometry of space-time, on quantum stochastic calculus and on the construction of quantum fields. Some of these effects are studied in this paper.Comment: 36 pages Latex, 1 eps figur