Água e degradação do solo.

bitstream/item/26832/1/gua-e-degradaAEo-do-solo-Portal-Dia-de-Campo.pd

Projeto SENSOR: políticas públicas relacionadas a expansão da Cana-de-açúcar para a produção de biocombustíveis.

bitstream/item/34007/1/documentos-124.pd

Land quality monitoring systems that integrate local and technical knowledge facilitate adaptation to global change in agricultural landscapes.

IHDP Open Meeting 2009

Diversidade microbiana e desenvolvimento sustentável.

Trabalho apresentado no workshop sobre biodiversidade: perspectivas e oportunidades tecnológicas. Campinas, 29/04 - 01/05/1996. Organizado pela Fundação Tropical de Pesquisas e Tecnologia André Tosello

Food and biofuel: a possible dialogue? An overview about brazilian ethanol context.

Tropentag 2015

Time evolution towards q-Gaussian stationary states through unified Ito-Stratonovich stochastic equation

We consider a class of single-particle one-dimensional stochastic equations which include external field, additive and multiplicative noises. We use a parameter $\theta \in [0,1]$ which enables the unification of the traditional It\^o and Stratonovich approaches, now recovered respectively as the $\theta=0$ and $\theta=1/2$ particular cases to derive the associated Fokker-Planck equation (FPE). These FPE is a {\it linear} one, and its stationary state is given by a $q$-Gaussian distribution with $q = \frac{\tau + 2M (2 - \theta)}{\tau + 2M (1 - \theta)}<3$, where $\tau \ge 0$ characterizes the strength of the confining external field, and $M \ge 0$ is the (normalized) amplitude of the multiplicative noise. We also calculate the standard kurtosis $\kappa_1$ and the $q$-generalized kurtosis $\kappa_q$ (i.e., the standard kurtosis but using the escort distribution instead of the direct one). Through these two quantities we numerically follow the time evolution of the distributions. Finally, we exhibit how these quantities can be used as convenient calibrations for determining the index $q$ from numerical data obtained through experiments, observations or numerical computations.Comment: 9 pages, 2 figure