Dynamics Mathematical Models
Mostrando 1-12 de 100 artigos, teses e dissertações.
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1. Mathematical modelling of vector-borne diseases and insecticide resistance evolution
Abstract Background: Vector-borne diseases are important public health issues and, consequently, in silico models that simulate them can be useful. The susceptible-infected-recovered (SIR) model simulates the population dynamics of an epidemic and can be easily adapted to vector-borne diseases, whereas the Hardy-Weinberg model simulates allele frequencies a
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 08/02/2018
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2. Population dynamics of Aphis gossypii Glover and in sole and intercropping systems of cotton and cowpea
ABSTRACT Population dynamics of aphids have been studied in sole and intercropping systems. These studies have required the use of more precise analytical tools in order to better understand patterns in quantitative data. Mathematical models are among the most important tools to explain the dynamics of insect populations. This study investigated the populati
An. Acad. Bras. Ciênc.. Publicado em: 01/02/2018
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3. Mathematical Description of a Flexible Connection of Links and its Applications in Modeling the Joints of Spatial Linkage Mechanisms
Abstract The general mathematical model of a flexible connection of links by means of spring-damping elements is presented in the paper. The formalism of homogeneous transformation matrices is used to derive formulas for the energy of spring deformation and the Rayleigh dissipation function of the spring-damping elements. The formulas have convenient forms t
Lat. Am. j. solids struct.. Publicado em: 2016-12
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4. MATHEMATICAL MODELING OF BATCH ADSORPTION OF MANGANESE ONTO BONE CHAR
Abstract The present study investigated the dynamics of batch adsorption of manganese onto bone char by using two distinct mathematical formulations: the diffusion model and the shrinking core model. Both models assumed spherical particles and adequately described the transient behavior of metal adsorption under changing operating conditions. Comparatively,
Braz. J. Chem. Eng.. Publicado em: 2016-06
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5. Incerteza e não ergodicidade: crítica aos neoclássicos
The starting point of this essay is to show that, in our view, the problem of the traditional economics is not in the deductive method nor the mathematical methods used, but to attribute to economic agents "power" on the future and prescribe the existence of ergodic stochastic processes in their economic analyzes. Thus, building a theory on the ground whose
Brazil. J. Polit. Econ.. Publicado em: 2014-06
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6. Análise dendroclimatológica do cedro (Cedrela fissilis L. - Meliaceae) para reconstrução do cenário ambiental recente da cidade de São Paulo, SP / Dendroclimatological analysis of cedro (Cedrela fissilis L. - Meliaceae) for the reconstruction of recent environmental scenario from São Paulo, SP
Desde a revolução industrial, o consumo de combustíveis fósseis pelo homem vem crescendo em ritmo acelerado. Com isso, aumentam também as concentrações dos chamados gases-estufa (CO2, CH4 e NxO). Isso gera alterações no clima, causando mudanças em fatores bióticos e abióticos, tanto em ambientes naturais quanto em ambientes urbanos. Algumas dessa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/04/2012
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7. FORMULACÃO UNIFICADA PARA MODELOS CINETICOS DERIVADOS DA EQUAÇÃO DE BOLTZMANN COM CONDIÇÕES DE CONTORNO GENERALIZADAS / UNIFIED FORMULATION FOR KINETIC MODELS DERIVATIVES OF BOLTZMANN EQUATION WITH GENERALIZED BOUNDARY CONDITIONS
In this paper, we present numerical results obtained from the FORTRAN language for physical quantities of interest such as velocity prole, prole, heat ow rate, particle ow rate,heat ux and pressure tensor component. The gas ow occur in the direction parallel to thesurface the gas is conned because of a constant gradient of pressure and a constant gradient of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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8. Decision support bioeconomic model for livestock systems / Modelo bioeconômico para suporte à decisão em sistemas pecuários
Rural managers make decisions in uncertain and dynamic environments. These characteristics, associated with bounded rationality can lead to the formulation of mental models that reflect reality in a distorted way. In this context, the procedures for modeling and simulation are important tools to understand how the production systems operate and to make decis
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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9. Investigação do escoamento bifásico gás-líquido em uma coluna de bolhas retangular por meio da técnica CFD / Investigation of two-phase gas-liquid flow in a rectangular bubble column using CFD technique
This study aims to evaluate the main forces which act in gas-liquid flow in a rectangular bubble column of dimensions 150cm x 26;4cm x 3;1cm (height (H) x width (W) x depth (D)), with centralized aeration, using CFD technique. The proposed case is based in a experimental study of an air-water system operating in homogeneous bubbly flow, with initial liquid h
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/12/2011
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10. Técnicas de processamento não linear de sinais aplicadas à investigação de limitações práticas do procedimento de ventilação mecânica não invasiva
Individuals with respiratory system dysfunctions or who are recovering from complex surgeries may have difficulty to sustain spontaneous breathing. The mechanical ventilation is a clinical procedure that supports ventilation until the patient is recovered. Noninvasive mechanical ventilation is especially remarkable as it can be used outside the hospital, in
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/05/2011
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11. Population dynamics, life stage and ecological modeling in Chrysomya albiceps (Wiedemann) (Diptera: Calliphoridae)
In this study we investigated the population dynamics of Chrysomya albiceps (Wiedemann) with laboratory experiments, employing survival analysis and stage structure mathematical models, emphasizing survival among life stages. The study also assessed the theoretical influence of density dependence and cannibalism during immature stages, on the population dyna
Neotropical Entomology. Publicado em: 2011-04
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12. Simulação da dinâmica de carbono em bacias hidrográficas
In most aquatic ecosystems respiration exceeds autochtonous gross primary production leading to a negative net ecosystem production. Recent studies attributes this condition to allochtonous organic matter degradation processes, so the inland water carbon cycle should be linked to the input of organic carbon from the catchment. This work contributes to a bett
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011