Sistema policultivar de milho: tecnologia para reduzir os riscos de producao no Piaui.

A pesquisa tem mostrado que quando se planta cultivares com caracteristicas de florescimento diferentes o risco de perdas de colheitas e bemmenor, mesmo em condicoes climaticas adversas. O sistema policultivar de milho e uma das maneiras de como o agricultor pode amenizar os riscos de perder sua lavoura, bastando para isso que ele escolha cultivares de ciclos diferentes, que semeadas na mesma epoca, terao maior possibilidade de escape, no caso de estiagens prolongadas. Sao recomendadasas cultivares hibridas com floracao entre 50 e 55 dias: PIONEE 6875, XL-560, AG 64 A, SAVE 342 e DK 550. O plantio deve ser feito no espacamento de 1,00 x 0,40m deixando-se duas plantas por cova.bitstream/item/95916/1/CT290001.pd

On Matrix Superpotential and Three-Component Normal Modes

We consider the supersymmetric quantum mechanics (SUSY QM) with three- component normal modes for the Bogomol'nyi-Prasad-Sommerfield (BPS) states. An explicit form of the SUSY QM matrix superpotential is presented and the corresponding three-component bosonic zero-mode eigenfunction is investigated.Comment: 17 pages, no figure. Paper accepted for publication in Journal of Physics A: Mathematical and Theoretica

On the Uq[sl(2)]{\cal{U}}_{q}[sl(2)] Temperley-Lieb reflection matrices

This work concerns the boundary integrability of the spin-s ${\cal{U}}_{q}[sl(2)]$ Temperley-Lieb model. A systematic computation method is used to constructed the solutions of the boundary Yang-Baxter equations. For $s$ half-integer, a general $2s(s+1)+3/2$ free parameter solution is presented. It turns that for $s$ integer, the general solution has $2s(s+1)+1$ free parameters. Moreover, some particular solutions are discussed.Comment: LaTex 17 page

Sliding Blocks Revisited: A simulational Study

A computational study of sliding blocks on inclined surfaces is presented. Assuming that the friction coefficient $\mu$ is a function of position, the probability $P(\lambda)$ for the block to slide down over a length $\lambda$ is numerically calculated. Our results are consistent with recent experimental data suggesting a power-law distribution of events over a wide range of displacements when the chute angle is close to the critical one, and suggest that the variation of $\mu$ along the surface is responsible for this.Comment: 6 pages, 4 figures. submitted to Int. J. Mod. Phys. (Proc. Brazilian Wokshop on Simulational Physics

Estudo de épocas de semeadura de feijão "safra das águas" em dois municípios da Grande Dourados em 1980/81.

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Competição de cultivares de feijão "safra das águas" em tres municípios do Mato Grosso do Sul, em 1980/81.

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Qualidade produtiva e de frutos de maciera cultivar Fuji Kiku-8 em diferentes sistemas de condução.

Resumo

Beyond Mean-Field Low-Lying Excitations of Dipolar Bose Gases

We theoretically investigate various beyond mean-field effects on Bose gases at zero temperature featuring the anisotropic and long-range dipole-dipole interaction in addition to the isotropic and short-range contact interaction. Within the realm of the Bogoliubov-de Gennes theory, we consider static properties and low-lying excitations of both homogeneous and harmonically trapped dipolar bosonic gases. For the homogeneous system, the condensate depletion, the ground-state energy, the equation of state, and the speed of sound are discussed in detail. Making use of the local density approximation, we extend these results in order to study the properties of a dipolar Bose gas in a harmonic trap and in the regime of large particle numbers. After deriving the equations of motion for the general case of a triaxial trap, we analyze the influence of quantum fluctuations on important properties of the gas, such as the equilibrium configuration and the low-lying excitations in the case of a cylinder-symmetric trap. In addition to the monopole and quadrupole oscillation modes, we also discuss the radial quadrupole mode. We find that the latter acquires a quantum correction exclusively due to the dipole-dipole interaction. As a result, we identify the radial quadrupole as a reasonably accessible source for the signature of dipolar many-body effects and stress the enhancing character that dipolar interactions have for quantum fluctuations in the other oscillation modes.Comment: Version published in PR