Nitrogênio, fósforo e potássio na nutrição e no crescimento de mudas de laranjeiravalência, enxertadas sobre limoeiro cravo

O experimento foi conduzido em casa de vegetação telada na FCAV/Unesp campus Jaboticabal-SP, durante o período de novembro de 2005 a janeiro de 2007. Conduziu-se este estudo, com o objetivo de avaliar componentes do desenvolvimento e do estado nutricional de mudas de laranjeira Valência (Citrus sinensis Osbeck), enxertadas sobre limoeiro Cravo (Citrus limonia Osbeck), em função de doses de nitrogênio, fósforo e potássio. O delineamento experimental foi inteiramente casualizado, em esquema fatorial 3³ + 1, sendo 3 fatores (nitrogênio, fósforo e potássio - NPK), 3 doses e uma testemunha (sem adubação), com 3 repetições. A unidade experimental foi representada por uma muda de laranjeira por sacola com 5 dm³ com 2,5 kg de substrato casca de Pinus spp. e vermiculita. Os tratamentos foram constituídos pela metade, uma vez e duas vezes a dose padrão recomendada, de 4.590; 920 e 4.380 mg sacola-1, de N, P e K, respectivamente. As adubações com N e K foram realizadas via fertirrigações três vezes por semana e o P foi adicionado ao substrato antes do replantio das mudas. Aos 424 dias após o transplantio, as plantas foram subdivididas em raízes e parte aérea para determinação da massa da matéria seca, altura, área foliar, diâmetro do caule e conteúdo de nutrientes. A adubação com N, P e K proporcionou maior desenvolvimento e maior acúmulo desses macronutrientes na parte aérea e nas raízes das mudas de laranjeira Valência, sobre limoeiro Cravo. Houve adequado desenvolvimento das plantas com a metade da dose recomendada de N, P e K pela literatura, aproximadamente de 918, 184 e 876 mg dm-3, respectivamente.

Radioactivity distribution in some Permian sediments from the Irati and Corumbatal formations of the Parana basin, southeastern Brazil

in the city of Limeira, southeastern Brazil, an important exposure of Permian sediments of the Parana basin was revealed by an open pit mine that exploits limestone for production of soil correction compounds and raw materials for the ceramic industry. The radioactivity of these sediments was investigated in some detail and the results provided a general view of the vertical distributions of uranium, thorium and potassium concentrations and of the element ratios U/K, U/Th and Th/K. In general, the concentrations of the main natural radioactive elements are low, with uranium being enriched in some limestone and shale levels. In addition the results showed that the U-238 series is in radioactive disequilibrium in many of the analyzed samples. Although the origin of the observed disequilibrium has not been investigated, the results suggest that it is due to weathering processes and water interaction with the rock matrix. (C) 2003 Elsevier Ltd. All rights reserved.

Relativistic Archimedes law for fast moving bodies and the general-relativistic resolution of the submarine paradox

We investigate and solve in the context of general relativity the apparent paradox which appears when bodies floating in a background fluid are set in relativistic motion. Suppose some macroscopic body, say, a submarine designed to lie just in equilibrium when it rests (totally) immersed in a certain background fluid. The puzzle arises when different observers are asked to describe what is expected to happen when the submarine is given some high velocity parallel to the direction of the fluid surface. on the one hand, according to observers at rest with the fluid, the submarine would contract and, thus, sink as a consequence of the density increase. on the other hand, mariners at rest with the submarine using an analogous reasoning for the fluid elements would reach the opposite conclusion. The general relativistic extension of the Archimedes law for moving bodies shows that the submarine sinks. As an extra bonus, this problem suggests a new gedankenexperiment for the generalized second law of thermodynamics.

Analysis of the E-J Curve of HTS Tapes Under DC and AC Magnetic Fields at 77 K

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

O aumento em superfície em Adelia membranifolia (Müll. Arg.) Pax & K. Hoffm. e Peltophorum dubium (Spreng.) Taub., em resposta ao estresse por deficiência nutricional e alagamento do substrato

Foram estudadas as respostas plásticas em plântulas e plantas jovens de duas espécies arbóreas nativas, Adelia membranifolia (Müll. Arg.) Pax & K. Hoffm. (Euphorbiaceae) e Peltophorum dubium (Spreng.) Taub. (Leguminosae-Caesalpinoidae), submetidas ao alagamento do substrado associado ao déficit nutricional. Avaliou-se o acréscimo em superfície no módulo de expressão, definido como a região do eixo da plântula que, sob condições de estresse, sofre rediferenciação sendo considerada a hipertrofia lenticelar como a expressão morfogenética mais comum. em A. membranifolia a associação do estresse nutricional e alagamento do substrato foi a condição mais restritiva tanto para o crescimento em altura e diâmetro do colo quanto para as expressões morfogenéticas. Já em P. dubium o estado nutricional foi mais restritivo que o alagamento para o crescimento do colo. em geral, para ambas as espécies, plantas nutridas mantidas alagadas restabeleceram seu ritmo de crescimento a partir do terceiro mês de tratamento, além de expressarem respostas plásticas como a hipertrofia lenticelar e a formação de raízes adventícias. Quanto ao aumento em superfície, nos lotes desnutridos, verificou-se que em A. membranifolia de um total de 38% de superfície expressa, 12% corresponderam à hipertrofia lenticelar. em P. dubium verificou-se as maiores variações de aumento em superfície expressa por hipertrofia lenticelar, elevando de 5% para 13%. em geral a superfície modular nos lotes tratados foi o dobro em relação ao controle. É possível que o aumento em superfície, para algumas espécies, seja significativo como tendência ao aumento da estabilidade no desenvolvimento a partir de interações fisiológicas.

General soliton matrices in the Riemann-Hilbert problem for integrable nonlinear equations

We derive the soliton matrices corresponding to an arbitrary number of higher-order normal zeros for the matrix Riemann-Hilbert problem of arbitrary matrix dimension, thus giving the complete solution to the problem of higher-order solitons. Our soliton matrices explicitly give all higher-order multisoliton solutions to the nonlinear partial differential equations integrable through the matrix Riemann-Hilbert problem. We have applied these general results to the three-wave interaction system, and derived new classes of higher-order soliton and two-soliton solutions, in complement to those from our previous publication [Stud. Appl. Math. 110, 297 (2003)], where only the elementary higher-order zeros were considered. The higher-order solitons corresponding to nonelementary zeros generically describe the simultaneous breakup of a pumping wave (u(3)) into the other two components (u(1) and u(2)) and merger of u(1) and u(2) waves into the pumping u(3) wave. The two-soliton solutions corresponding to two simple zeros generically describe the breakup of the pumping u(3) wave into the u(1) and u(2) components, and the reverse process. In the nongeneric cases, these two-soliton solutions could describe the elastic interaction of the u(1) and u(2) waves, thus reproducing previous results obtained by Zakharov and Manakov [Zh. Eksp. Teor. Fiz. 69, 1654 (1975)] and Kaup [Stud. Appl. Math. 55, 9 (1976)]. (C) 2003 American Institute of Physics.

A statistical law for multiplicities of SU(3) irreps (lambda, mu) in the plethysm {eta} circle times(3) {m} -> (lambda, mu)

A statistical law for the multiplicities of the SU(3) irreps (lambda, mu) in the reduction of totally symmetric irreducible representations {m} of U(N), N = (eta + 1) (eta + 2)/2 with eta being the three-dimensional oscillator major shell quantum number, is derived in terms of the quadratic and cubic invariants of SU(3), by determining the first three terms of an asymptotic expansion for the multiplicities. To this end, the bivariate Edgeworth expansion known in statistics is used. Simple formulae, in terms of m and eta, for all the parameters in the expansion are derived. Numerical tests with large m and eta = 4, 5 and 6 show good agreement with the statistical formula for the SU(3) multiplicities.

Friction losses in valves and fittings for power-law fluids

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

AMINO-ACID-SEQUENCE OF TSTX-V, AN ALPHA-TOXIN FROM TITYUS-SERRULATUS SCORPION-VENOM, AND ITS EFFECT ON K+ PERMEABILITY OF BETA-CELLS FROM ISOLATED RAT ISLETS OF LANGERHANS

Highly purified Tityustoxin V (TsTX-V), an alpha-toxin isolated from the venom of the Brazilian scorpion Tityus serrulatus, was obtained by ion exchange chromatography on carboxymethylcellulose-52. It was shown to be homogeneous by reverse phase high performance liquid chromatography, N-terminal sequencing (first 39 residues) of the reduced and alkylated protein and by polyacrylamide gel electrophoresis in the presence of sodium dodecylsulfate and tricine. Following enzymatic digestion, the complete amino acid sequence (64 residues) was determined. The sequence showed higher homology with the toxins from the venoms of the North African than with those of the North and South American scorpions. Using the rate of Rb-86(+) release from depolarized rat pancreatic beta-cells as a measure of K+ permeability changes, TsTX-V (5.6 mu g/ml) was found to increase by 2.0-2.4-fold the rate of marker outflow in the presence of 8.3 mM glucose. This effect was persistent and slowly reversible, showing similarity to that induced by 100 mu-M veratridine, an agent that increases the open period of Na+ channels, delaying their inactivation. It is suggested that, by extending the depolarized period, TsTX-V indirectly affects beta-cell voltage-dependent K+ channels, thus increasing K+ permeability.

Scaling law for baryon coupling to its current and its possible applications

The baryon coupling to its current (λB), in conventional QCD sum rule calculations (QCDSR), is shown to scale as the cubic power of the baryon mass, MB. Some theoretical justification for it comes from a simple light-cone model and also general scaling arguments for QCD. But more importantly, taken as a phenomenological ansatz for the present, this may find very good use in current explorations of possible applications of QCDSR to baryon physics both at temperature T = 0, T ≠ 0 and/or density ρ = 0, ρ ≠ 0. © World Scientific Publishing Company.

Preprocessing data for short-term load forecasting with a general regression neural network and a moving average filter

This paper proposes a filter based on a general regression neural network and a moving average filter, for preprocessing half-hourly load data for short-term multinodal load forecasting, discussed in another paper. Tests made with half-hourly load data from nine New Zealand electrical substations demonstrate that this filter is able to handle noise, missing data and abnormal data. © 2011 IEEE.

Short-term multinodal load forecasting in distribution systems using general regression neural networks

Multinodal load forecasting deals with the loads of several interest nodes in an electrical network system, which is also known as bus load forecasting. To perform this demand, it is necessary a technique that is precise, trustable and has a short-time processing. This paper proposes two methodologies based on general regression neural networks for short-term multinodal load forecasting. The first individually forecast the local loads and the second forecast the global load and individually forecast the load participation factors to estimate the local loads. To design the forecasters it wasn't necessary the previous study of the local loads. Tests were made using a New Zealand distribution subsystem and the results obtained are compatible with the ones founded in the specialized literature. © 2011 IEEE.

A recepção crítica de J.-K. Huysmans em periódicos no Brasil (1884 – 2013)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)