Utilização de minhocas na estabilização de resíduos orgânicos: Vermicompostagem.

Criação das minhocas.bitstream/CNPAB-2010/27133/1/cot008.pdfed. rev. mod

An exact analytical solution for generalized growth models driven by a Markovian dichotomic noise

Logistic growth models are recurrent in biology, epidemiology, market models, and neural and social networks. They find important applications in many other fields including laser modelling. In numerous realistic cases the growth rate undergoes stochastic fluctuations and we consider a growth model with a stochastic growth rate modelled via an asymmetric Markovian dichotomic noise. We find an exact analytical solution for the probability distribution providing a powerful tool with applications ranging from biology to astrophysics and laser physics

Investigation of low latitude scintillations in Brazil within the cigala project

Ionospheric scintillations are fluctuations in the phase and amplitude of the signals from GNSS satellites occurring when they cross regions of electron density irregularities in the ionosphere. Such disturbances can cause serious degradation on GNSS system performance, including integrity, accuracy and availability. The two indices internationally adopted to characterize ionospheric scintillations are: the amplitude scintillation index, S4, which is the standard deviation of the received power normalized by its mean value, and the phase scintillation index, σΦ, which is the standard deviation of the de-trended carrier phase. At low latitudes scintillations occur very frequently and can be intense. This is because the low latitudes show a characteristic feature of the plasma density, known as the equatorial anomaly, EA, for which a plasma density enhancement is produced and seen as crests on either side of the magnetic equator. It is a region in which the electron density is considerably high and inhomogeneous, producing ionospheric irregularities causing scintillations. The upcoming solar maximum, which is expected to reach its peak around May 2013, occurs at a time when our reliance on high-precision GNSS (such as GPS, GLONASS and the forthcoming GALILEO) has reached unprecedented proportions. Understanding and monitoring of scintillations are essential, so that warnings and forecast information can be made available to GNSS end users, either for global system or local augmentation network administrators in order to guarantee the necessary levels of accuracy, integrity and availability of high precision and/or safety-of-life applications. Especially when facing severe geospatial perturbations, receiver-level mitigations are also needed to minimize adverse effects on satellite signals tracking availability and accuracy. In this context, the challenge of the CIGALA (Concept for Ionospheric scintillation mitiGAtion for professional GNSS in Latin America) project, co-funded by the European GNSS Agency (GSA) through the European 7th Framework Program, is to understand the causes of ionospheric disturbances and model their effects in order to develop novel counter-measure techniques to be implemented in professional multi-frequency GNSS receivers. This paper describes the scientific advancements made within the project to understand and characterize ionospheric scintillation in Brazil by means of historical and new datasets

Endogenous territorial development in mountain environments: the case of the territory of the Alto Camaquã, Brazil.

The territory of Alto Camaquã, in the southern state of Rio Grande do Sul ‐ Brazil, it has been highlighted by the strengthening of family livestock from associative process based on the construction of collective territorial mark that identifies the production with the landscape socially constructed of local mountain environments

Maciços naturais de macaúba (Acrocomia aculeata): mapeamento e análise do potencial para produção de biodiesel.

Macaúba (Acrocomia aculeata) é uma palmeira nativa de múltiplos usos e com grande potencial para a produção de óleo com fins energéticos, o que tem despertado o interesse de vários setores. O objetivo deste trabalho foi mapear os maciços naturais de macaúba e analisar o potencial produtivo da espécie para biodiesel. Foram mapeados 513.681 ha utilizando imagens de satélites de alta resolução e registrados 143.308 indivíduos de A. aculeata, cuja maior ocorrência foi observada em Arapuá, Carmo do Paranaíba, Córrego Danta (MG) e Formosa (GO). Baseado no numero de indivíduos mapeados, na produção média de frutos e no rendimento de óleo dos maciços analisados estima-se uma produção de 606.519 kg de biodiesel/ano para uma área mapeada de 22.000 ha. Extrapolando os valores encontrados nas áreas mapeadas para os municípios onde estão localizados um dos maciços, o potencial de produção de biodiesel saltaria para 4.065.356 kg/ano, apenas considerando a área dos municípios de Arapuá e Carmo do Paranaíba. Em plantios adensados o potencial de produção pode aumentar exponencialmente, sobretudo se considerado a seleção de materiais promissores. Deve-se, em entanto, atentar para a necessidade de estudos de boas práticas de manejo de maciços naturais visando o extrativismo sustentável