Produção e composição química de aveia não irrigada em quatro épocas de corte.

A aveia preta e os cultivadores UPF2, UPF3 e UPF7 de aveia amarela foram avaliados durante o período de inverno, sem irrigação em Jaboticabal-SP. As plantas foram colhidas aos 51, 64, 77 e 90 dias após a semeadura. A produção de MS variou de 931,6 a 2378,3 kg/ha para aveia preta, de 903,4 a 3135,2 kg/ha para a cv. UPF2 de 439,7 a 3920,9 kg/ha para a cv. UPF3 e de 1003,7 a 4351.1 kg/ha para a cv. UPF7. Dos 51 aos 90 dias após a semeadura os teores de PB na folha decresceram, de 18,0% para 10,2%, e os de FDN aumentaram de 41,6% para 47,9%.Resumo expandid

Superconducting charge qubits from a microscopic many-body perspective

The quantised Josephson junction equation that underpins the behaviour of charge qubits and other tunnel devices is usually derived through cannonical quantisation of the classical macroscopic Josephson relations. However, this approach may neglect effects due to the fact that the charge qubit consists of a superconducting island of finite size connected to a large superconductor. We show that the well known quantised Josephson equation can be derived directly and simply from a microscopic many-body Hamiltonian. By choosing the appropriate strong coupling limit we produce a highly simplified Hamiltonian that nevertheless allows us to go beyond the mean field limit and predict further finite-size terms in addition to the basic equation.Comment: Accepted for J Phys Condensed Matte

q-Deformed Kink Solutions

The q-deformed kink of the $\lambda\phi^4-$model is obtained via the normalisable ground state eigenfunction of a fluctuation operator associated with the q-deformed hyperbolic functions. From such a bosonic zero-mode the q-deformed potential in 1+1 dimensions is found, and we show that the q-deformed kink solution is a kink displaced away from the origin.Comment: REvtex, 11 pages, 2 figures. Preprint CBPF-NF-005/03, site at http://www.cbpf.br. Revised version to appear in International Journal of Modern Physics