Connectivity-dependent properties of diluted sytems in a transfer-matrix description

We introduce a new approach to connectivity-dependent properties of diluted systems, which is based on the transfer-matrix formulation of the percolation problem. It simultaneously incorporates the connective properties reflected in non-zero matrix elements and allows one to use standard random-matrix multiplication techniques. Thus it is possible to investigate physical processes on the percolation structure with the high efficiency and precision characteristic of transfer-matrix methods, while avoiding disconnections. The method is illustrated for two-dimensional site percolation by calculating (i) the critical correlation length along the strip, and the finite-size longitudinal DC conductivity: (ii) at the percolation threshold, and (iii) very near the pure-system limit.Comment: 4 pages, no figures, RevTeX, Phys. Rev. E Rapid Communications (to be published

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 the connection of Gamma-rays, Dark Matter and Higgs searches at LHC

Motivated by the upcoming Higgs analyzes we investigate the importance of the complementarity of the Higgs boson chase on the low mass WIMP search in direct detection experiments and the gamma-ray emission from the Galactic Center measured by the Fermi-LAT telescope in the context of the $SU(3)_c\otimes SU(3)_L\otimes U(1)_N$. We obtain the relic abundance, thermal cross section, the WIMP-nucleon cross section in the low mass regime and network them with the branching ratios of the Higgs boson in the model. We conclude that the Higgs boson search has a profound connection to the dark matter problem in our model, in particular for the case that ($M_{WIMP} < 60$ GeV) the BR($H \rightarrow 2$ WIMPs) $\gtrsim 90$. This scenario could explain this plateau of any mild excess regarding the Higgs search as well as explain the gamma-ray emission from the galactic center through the $b\bar{b}$ channel with a WIMP in the mass range of 25-45 GeV, while still being consistent with the current limits from XENON100 and CDMSII. However, if the recent modest excesses measured at LHC and TEVATRON are confirmed and consistent with a standard model Higgs boson this would imply that $M_{WIMP} > 60$ GeV, consequently ruling out any attempt to explain the Fermi-LAT observations.Comment: 8 pages, 9 figure

Smoothly-varying hopping rates in driven flow with exclusion

We consider the one-dimensional totally asymmetric simple exclusion process (TASEP) with position-dependent hopping rates. The problem is solved,in a mean field/adiabatic approximation, for a general (smooth) form of spatial rate variation. Numerical simulations of systems with hopping rates varying linearly against position (constant rate gradient), for both periodic and open boundary conditions, provide detailed confirmation of theoretical predictions, concerning steady-state average density profiles and currents, as well as open-system phase boundaries, to excellent numerical accuracy.Comment: RevTeX 4.1, 14 pages, 9 figures (published version

Cultivo de açaizeiros e manejo de açaizais para produção de frutos.

Produção de mudas de açaizeiros em viveiros tradicionais; Produção de mudas de açaí em viveiros na floresta; Cultivo de açaizeiro; Plantio em terra firme; Plantio em várzea, grotas e matas de galeria; Manejo de açaizais; Tipos de açaizeiros; O suco de açaí como alimento; Utilização de resíduos de açaí.bitstream/item/98195/1/CPAF-AP-2001-Cultivo-acaizeros.pd

Tipos de açaizais do estuário amazônico e efeitos das intervenções praticadas por extratores ribeirinhos.

Denomina-se açaizal o ambiente florestal onde a presença do açaizeiro (Euterpe oleracea Mart.) é visível e marcante. Com o objetivo de conhecer tipos de manejo, o impacto causado pela exploração de palmito, e orientar a instalação de projetos de pesquisa para manejo de açaizais, realizou-se o presente trabalho

Estrutura e manejo de sistemas agroflorestais tradicionais do estuário amazônico.

O açaizeiro (Euterpe oleracea) é uma palmeira (Arecaceae) presente nas florestas que margeiam os rios e igarapés da região amazônica. Seu fruto é utilizado na fabricação do vinho (suco da polpa) e constitui-se num dos principais alimentos das populações ribeirinhas. A divulgação das propriedades nutritivas do fruto do açaí e o novo hábito de consumo em outras regiões do país estão possibilitando a abertura de novos mercados, com um cenário promissor para sua produção e industrialização

Boas práticas e sistema APPCC na fase de pós-colheita de milho.

bitstream/CNPMS-2010/22381/1/Circ-122.pd