Complete high-precision entropic sampling

Monte Carlo simulations using entropic sampling to estimate the number of configurations of a given energy are a valuable alternative to traditional methods. We introduce {\it tomographic} entropic sampling, a scheme which uses multiple studies, starting from different regions of configuration space, to yield precise estimates of the number of configurations over the {\it full range} of energies, {\it without} dividing the latter into subsets or windows. Applied to the Ising model on the square lattice, the method yields the critical temperature to an accuracy of about 0.01%, and critical exponents to 1% or better. Predictions for systems sizes L=10 - 160, for the temperature of the specific heat maximum, and of the specific heat at the critical temperature, are in very close agreement with exact results. For the Ising model on the simple cubic lattice the critical temperature is given to within 0.003% of the best available estimate; the exponent ratios $\beta/\nu$ and $\gamma/\nu$ are given to within about 0.4% and 1%, respectively, of the literature values. In both two and three dimensions, results for the {\it antiferromagnetic} critical point are fully consistent with those of the ferromagnetic transition. Application to the lattice gas with nearest-neighbor exclusion on the square lattice again yields the critical chemical potential and exponent ratios $\beta/\nu$ and $\gamma/\nu$ to good precision.Comment: For a version with figures go to http://www.fisica.ufmg.br/~dickman/transfers/preprints/entsamp2.pd

Experiência brasileira de pesquisa econômica em energia para o setor rural.

Sistemas integrados a nível de propriedade rural: energia e alimentos; Auto suficiência energética: avaliação a nível de cooperativa e comunidade; Política energética a nível regional; Pesquisas econômicas para os fatores de produção na agricultura.bitstream/item/43734/1/Experiencia-brasileira-de-pesquisa.pd

Efeito da temperatura de condicionamento sobre a digestibilidade da proteina bruta e metabolizabilidade de dietas para frangos de corte.

Sabe-se que o tratamento térmico do alimento pode melhorar seu aproveitamento, sendo a influência do processamento sobre a digestibilidade o principal modo de ação (4). A peletização da ração aumenta a digestibilidade das frações da dieta pela ação mecânica e pela temperatura do processo. Os processos térmicos também promovem alterações das estruturas terciárias naturais das proteínas, facilitando sua digestão (2). A peletização proporciona um aumento do valor energético dos nutrientes, sendo uma alternativa viável para dietas de frangos de corte em termos de aumento da energia metabolizável da dieta. Com isso, objetivou-se avaliar o efeito de diferentes temperaturas de condicionamento sobre o coeficiente de metabolizabilidade aparente da matéria seca (CMAMS) e o coeficiente de digestibilidade aparente da proteína bruta (CDPBap)

Eine arithmetische Formel

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A separação de poderes e direitos fundamentais: algumas reflexões a partir de exemplos emblemáticos vindos dos Países Baixos

The article outlines a brief constitutional-institutional scenario of the Netherlands as background to analyze two paradigmatic cases, the Urgenda case and the childcare allowance scandal. These two cases bring to light different behaviours of the judge in offering legal protection to fundamental rights. The analysis of these cases in the Dutch model, in which there is no judicial constitutional review, is enlightening about the new challenges faced by the State -climate change and the advent of the digital era- and the need to rethink the theory of separation of powers aiming to offering effective legal protection to fundamental rights.The Legitimacy and Effectiveness of Law & Governance in a World of Multilevel Jurisdiction

Aerosol number fluxes over the Amazon rain forest during the wet season

Number fluxes of particles with diameter larger than 10 nm were measured with the eddy covariance method over the Amazon rain forest during the wet season as part of the LBA (The Large Scale Biosphere Atmosphere Experiment in Amazonia) campaign 2008. The primary goal was to investigate whether sources or sinks dominate the aerosol number flux in the tropical rain forest-atmosphere system. During the measurement campaign, from 12 March to 18 May, 60% of the particle fluxes pointed downward, which is a similar fraction to what has been observed over boreal forests. The net deposition flux prevailed even in the absolute cleanest atmospheric conditions during the campaign and therefore cannot be explained only by deposition of anthropogenic particles. The particle transfer velocity v(t) increased with increasing friction velocity and the relation is described by the equation v(t) = 2.4x10(-3)xu(*) where u(*) is the friction velocity. Upward particle fluxes often appeared in the morning hours and seem to a large extent to be an effect of entrainment fluxes into a growing mixed layer rather than primary aerosol emission. In general, the number source of primary aerosol particles within the footprint area of the measurements was small, possibly because the measured particle number fluxes reflect mostly particles less than approximately 200 nm. This is an indication that the contribution of primary biogenic aerosol particles to the aerosol population in the Amazon boundary layer may be low in terms of number concentrations. However, the possibility of horizontal variations in primary aerosol emission over the Amazon rain forest cannot be ruled out.National Institute for Research in the Amazon (INPA)LBA infrastructure teamCNPq/MCT Millennium Institute ProgramFAPES