Diffusive Processes
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. REHYDRATION KINETICS OF DEHYDRATED BERRIES
ABSTRACT Cranberries and blueberries are small fruits known for their antioxidant properties. However, due to their high water content and short shelf life, they are generally marketed as dehydrated berries. The present work aimed to model the rehydration of dehydrated berries. Rehydration tests were conducted at 7 and 29°C using milk as a solvent and at 7,
Eng. Agríc.. Publicado em: 2021-05
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2. Sistemas dinâmicos fuzzy aplicados a processos difusivos / Fuzzy dynamic systems applied to diffusive processes
Neste trabalho definiremos solução fuzzy para problemas que envolvam difusão e exploraremos algumas propriedades importantes como unicidade e estabilidade dessas soluções. Basicamente estamos interessados em considerar algumas características importantes desses problemas difusivos como incertos, para isso, usaremos o conceito de numero fuzzy. Termos co
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/09/2011
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3. Propriedades difusivas de sistemas clÃssicos confinados / Diffusive properties of confined classical systems
Nesta dissertaÃÃo, fizemos um estudo das propriedades difusivas de um sistema de partÃculas clÃssicas carregadas em canais quasi-unidimensionais. Mais especificamente, no CapÃtulo 2, apresentamos uma revisÃo do problema da difusÃo e do movimento browniano. Mostramos que as abordagens de Einstein e de Langevin para o movimento browniano sÃo equivalent
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/01/2011
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4. Lie symmetries and related group-invariant solutions of a nonlinear Fokker-Planck equation based on the Sharma-Taneja-Mittal entropy
In the framework of the statistical mechanics based on the Sharma-Taneja-Mittal entropy we derive a family of nonlinear Fokker-Planck equations characterized by the associated non-increasing Lyapunov functional. This class of equations describes kinetic processes in anomalous mediums where both super-diffusive and subdiffusive mechanisms arise contemporarily
Brazilian Journal of Physics. Publicado em: 2009-08
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5. Simulation, analysis and computational characterization of fingering patterns in fluids displacement on porous media. / Simulação, análise e caracterização computacional de padrões de fingering em deslocamentos de fluidos em meios porosos
In this work, the patterns related to the displacement process of an interface between two ftuids of different mobilities are studied computationally. In the literature, the formation process of these patterns is known as fingering, a type of dynamic instability in the interface between two miscible fluids, where the fingers are classified in two types: dens
Publicado em: 2009
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6. Reaction-diffusion stochastic lattice model for a predator-prey system
We have the purpose of analyzing the effect of explicit diffusion processes in a predator-prey stochastic lattice model. More precisely we wish to investigate the possible effects due to diffusion upon the thresholds of coexistence of species, i. e., the possible changes in the transition between the active state and the absorbing state devoid of predators.
Brazilian Journal of Physics. Publicado em: 2008-03
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7. Modelos de processos difusivos e solução aproximada usando volumes finitos / Models of diffusive processes and approximate
Inicialmente é apresentado um capítulo sobre a modelagem matemática e sua importância nos dias atuais. Discutimos o papel das equações diferenciais, ordinárias e parciais, na representação matemática de processos reais que envolvam leis de conservação usadas na física dando enfoque às equações de difusão, que resultam do princípio de conser
Publicado em: 2008
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8. Asymetric exclusion model for intracellular transport driven by molecular motors / Um modelo de exclusão assimétrico para o transporte de partículas mediado por motores moleculares
Motores moleculares são proteínas capazes de transportar objetos tais como vesículas, organelas e macromoléculas ao longo do citoesqueleto. Tratam-se de dispositivos bastante interessantes do ponto de vista físico, pois produzem trabalho em um ambiente extremamente ruidoso. Recentemente, diversos experimentos realizados in vivo têm revelado que objetos
Publicado em: 2008
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9. A mathematical model for isothermal heap and column leaching
Leaching occurs in metals recovery, in contaminated soil washing, and in many natural processes, such as fertilizer dissolution and rock weathering. This paper presents a model developed to simulate the transient evolution of the dissolved chemical species in the heap and column isothermal leaching processes. In this model, the solid bed is numerically divid
Brazilian Journal of Chemical Engineering. Publicado em: 2004-09
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10. MODELOS ESTOCÁSTICOS PARA A VOLATILIDADE DO MERCADO DE AÇÕES BRASILEIRO / STOCHASTIC MODELS FOR THE BRAZILIAN STOCK MARKET VOLATILITY
The volatility of a financial time series is a key variable in the modeling of the financial markets. It controls the risk measure associated with the dynamics of price of a financial asset and also affects the rational price of derivative products. The volatility of a financial asset is a statistical quantity that describes the characteristic magnitude of p
Publicado em: 2004
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11. Osmótica dehydration in ternary solutions, thermal drying and transistions of filé of tilápia (Oreochromis niloticus) / Desidratação osmotica em soluções ternarias, secagem e transições termicas de file de tilapia (Oreochromis niloticus)
In this work the osmotic dehydration in ternary solutions (NaCl-water-sucrose) and drying processes of Tilapia fillet (Oreochromis niloticus) were studied. Moreover the calorimetric study of impregnated fillet with sodium cWoride, sucrose or both solutes was developed and denaturation and glass transition temperatures were determined. The osmotic dehydration
Publicado em: 2003
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12. Estudo da desidratação de tomates em pedaços com pré-tratamento osmótico
Vegetables drying plays an important role in the field of food dehydration, being a very old practice that was originated from sun drying items of food in order to preserve them to be consumed during the periods of scarcity. One of these vegetables is the tomato, that was originally grown in South America. Tomatoes are easily perishable after being picked up
Publicado em: 2002