Logarithmic corrections to gap scaling in random-bond Ising strips

Numerical results for the first gap of the Lyapunov spectrum of the self-dual random-bond Ising model on strips are analysed. It is shown that finite-width corrections can be fitted very well by an inverse logarithmic form, predicted to hold when the Hamiltonian contains a marginal operator.Comment: LaTeX code with Institute of Physics macros for 7 pages, plus 2 Postscript figures; to appear in Journal of Physics A (Letter to the Editor

On locations and properties of the multicritical point of Gaussian and +/-J Ising spin glasses

We use transfer-matrix and finite-size scaling methods to investigate the location and properties of the multicritical point of two-dimensional Ising spin glasses on square, triangular and honeycomb lattices, with both binary and Gaussian disorder distributions. For square and triangular lattices with binary disorder, the estimated position of the multicritical point is in numerical agreement with recent conjectures regarding its exact location. For the remaining four cases, our results indicate disagreement with the respective versions of the conjecture, though by very small amounts, never exceeding 0.2%. Our results for: (i) the correlation-length exponent $\nu$ governing the ferro-paramagnetic transition; (ii) the critical domain-wall energy amplitude $\eta$; (iii) the conformal anomaly $c$; (iv) the finite-size susceptibility exponent $\gamma/\nu$; and (v) the set of multifractal exponents $\{\eta_k \}$ associated to the moments of the probability distribution of spin-spin correlation functions at the multicritical point, are consistent with universality as regards lattice structure and disorder distribution, and in good agreement with existing estimates.Comment: RevTeX 4, 9 pages, 2 .eps figure

Psilídeos no Brasil: 8 - Mastigimas anjosi (Hemiptera, Psylloidea), nova praga da Toona ciliata no Brasil.

bitstream/item/82815/1/CT-313-Dalva-final.pd

Surface crossover exponent for branched polymers in two dimensions

Transfer-matrix methods on finite-width strips with free boundary conditions are applied to lattice site animals, which provide a model for randomly branched polymers in a good solvent. By assigning a distinct fugacity to sites along the strip edges, critical properties at the special (adsorption) and ordinary transitions are assessed. The crossover exponent at the adsorption point is estimated as $\phi = 0.505 \pm 0.015$, consistent with recent predictions that $\phi = 1/2$ exactly for all space dimensionalities.Comment: 10 pages, LaTeX with Institute of Physics macros, to appear in Journal of Physics

Efeito do tamanho do recipiente sobre o desenvolvimento de mudas de graviola (Annona muricata L.) no Estado do Amapá.

O presente estudo visa avaliar o efeito do tamanho do recipiente sobre o desenvolvimento de mudas de graviola.bitstream/item/97460/1/CPAF-AP-2000-Mudas-graviolas.pd

Psyllaephagus trioziphagus (Howard, 1885) (Hym.: Encyrtidae), novo parasitoide de Mastigimas anjosi Burckhardt et al., 2011 (Hemiptera: Psylloidea: Calophyidae).

Resumo

Ocorrência do Psilídeo Mastigimas sp em Toona ciliata no Brasil.

EVINCI. Resumo

La hélice del poder público : patrones de distribución de recursos federales para las Fundaciones Estatales del Apoyo a la Investigación

O trabalho tem por objetivo identificar padrões de distribuição nas transferências de recursos federais para as Fundações Estaduais de Amparo à Pesquisa (FAPs), no período de 2004 a 2012, no contexto de implantação da política nacional de Ciência, Tecnologia e Inovação (C,T&I). O referencial teórico que orientou a análise da política de C,T&I foi fundamentado por estudos de autores que se filiam ao neoinstitucionalismo. Como o estudo buscava identificar associações entre variáveis, foi adotada a correlação de Kendall-Tau, uma vez que os dados não atenderam aos requisitos de normalidade. Constatou-se um distanciamento entre o padrão das transferências de recursos realizadas no período estudado e os objetivos de longo prazo propostos pela política, que consistem na redução das desigualdades regionais e na promoção do desenvolvimento do país.The goal of this study was to identify the pattern of distribution in the transfer of federal resources to state-run Research Support Foundations (RSFs), between 2004 and 2012, within the context of the implementation of the national Science, Technology and Innovation (STI) policy. The theoretical framework that guided the analysis of this STI policy was based on work by authors affiliated to the concept of neo-institutionalism. Since this study sought to identify any associations there might be between the variables, the correlation of Kendall-Tau was applied because the data did not meet the requirements of normality. A gap was noted between the pattern of resource transfers during the period analyzed and the long-term goals proposed by the policy, which were aimed at reducing regional inequalities and at promoting Brazil's development.Este trabajo tiene como objetivo identificar a los patrones de distribución de las transferencias de fondos federales para las Fundaciones Estatales del Apoyo a la Investigación (FAPs), de 2004 a 2012, en el contexto de la aplicación de la ciencia nacional, la tecnología y la innovación (C,T&I). El marco teórico que guió el análisis de las políticas de C,T&I se basó en estudios de autores que están afiliados al neoinstitucionalismo. Como el estudio trató de identificar las asociaciones entre variables, se adoptó la correlación Kendall-Tau, ya que los datos no cumplían con los requisitos de normalidad. Se constató una discrepancia entre el patrón de las transferencias de recursos realizadas durante el periodo estudiado y los objetivos a largo plazo propuestos por la política, que consisten en la reducción de las desigualdades regionales y promoción del desarrollo del país