Comportamento sazonal do potencial hídrico e das trocas gasosoas de quatro variedades de coqueiro anão.

bitstream/item/25879/1/bp-18.pd

Comportamento do coqueiro anão verde irrigado consorciado com frutíferas na região dos Tabuleiros Costeiros do nordeste do Brasil.

bitstream/item/34793/1/cot-37.pd

Efeito da aplicação de água salina do desenvolvimetno e comportamento fisiológico do coqueiro.

bitstream/CPATC-2009-09/20353/1/bp_27.pd

A new method of measuring two-phase mass flow rates in a venturi

The metering of the individual flow rates of gas and liquid in a multi-component flow is of great importance for the oil industry. A convenient, non-intrusive way of measuring these is the registration and analyzing of pressure drops over parts of a venturi. The commercially available venturi-based measuring equipment is costly since they additionally measure the void fraction. This paper presents a method to deduce the individual mass flow rates of air and water from pressure drop ratios and fluctuations in pressure drops. Not one but two pressure drops are used and not only time-averaged values of pressure drops are utilized. As a proof-of-principle, prediction results for a horizontal and vertical venturi are compared with measurements for void fractions up to 80 %. Residual errors are quantified and the effect of variation of equipment and of slip correlation is shown to be negligible. At relatively low cost a good predictive capacity of individual mass flow rates is obtained

Avaliação de cultivares de coqueiro no planalto central do Brasil.

bitstream/CPATC/19769/1/f_06_2007.pdfExiste o documento impresso

Electronic Phase Separation Transition as the Origin of the Superconductivity and the Pseudogap Phase of Cuprates

We propose a new phase of matter, an electronic phase separation transition that starts near the upper pseudogap and segregates the holes into high and low density domains. The Cahn-Hilliard approach is used to follow quantitatively this second order transition. The resulting grain boundary potential confines the charge in domains and favors the development of intragrain superconducting amplitudes. The zero resistivity transition arises only when the intergrain Josephson coupling $E_J$ is of the order of the thermal energy and phase locking among the superconducting grains takes place. We show that this approach explains the pseudogap and superconducting phases in a natural way and reproduces some recent scanning tunneling microscopy dataComment: 4 pages and 5 eps fig