Stability Mathematical Models
Mostrando 1-12 de 31 artigos, teses e dissertações.
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1. THERMODYNAMIC PROPERTIES OF WHITE BEAN GRAINS FOR DIFFERENT EQUILIBRIUM WATER CONTENTS
ABSTRACT In drying processes and in the storage of agricultural products, the study of thermodynamic properties is indispensable in the search for solutions to issues of stability and optimization of the conditions of agro-industrial processes. The aim of this work was to determine hygroscopic equilibrium isotherms and study the thermodynamic properties of w
Eng. Agríc.. Publicado em: 2021-05
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2. Method of control of machining accuracy of low-rigidity elastic-deformable shafts
The paper presents an analysis of the possibility of increasing the accuracy and stability of machining of low-rigidity shafts while ensuring high efficiency and economy of their machining. An effective way of improving the accuracy of machining of shafts is increasing their rigidity as a result of oriented change of the elastic-deformable state through the
Lat. Am. j. solids struct.. Publicado em: 2014-03
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3. Ação antioxidante de extratos de especiarias e suas misturas binárias e ternárias sobre a estabilidade oxidativa de óleo de soja / Antioxidant activity of spices extracts and their binary and ternary mixtures on soybean oil oxidative stability
The lipid oxidation produces undesirable compounds that alter the organoleptic characteristics of food lipids and reduce the nutritional quality. In the food, cosmetics and pharmaceutical industries, synthetic antioxidants are added to retard or prevent the lipid deterioration. Due to the possible toxicity of synthetic antioxidants and the call for active na
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/10/2012
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4. Utilising neural networks and closed form solutions to determine static creep behaviour and optimal polypropylene amount in bituminous mixtures
The testing procedure in order to determine the precise mechanical testing results in Marshall design is very time consuming. Also, the physical properties of the asphalt samples are obtained by further calculations. Therefore if the researchers can obtain the stability and flow values of a standard mixture with the help of mechanical testing, the rest of th
Mat. Res.. Publicado em: 25/09/2012
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5. Numerical analysis of the nonlinear subgrid scale method
This paper presents the numerical analysis of the Nonlinear Subgrid Scale (NSGS) model for approximating singularly perturbed transport models. The NSGS is a free parameter subgrid stabilizing method that introduces an extra stability only onto the subgrid scales. Thisnew feature comes from the local control yielded by decomposing the velocity field into the
Comput. Appl. Math.. Publicado em: 2012
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6. Análise da suscetibilidade e do grau de risco a escorregamentos rasos na bacia do Alto Aricanduva, RMSP (SP) / Analysis the susceptibility and the risk degree to shallow landslides in Aricanduva upper basin, São Paulo Metropolitan Region (SP)
Na cidade de São Paulo, é freqüente a ocorrência de escorregamentos, causando a destruição de moradias e muitos danos econômicos com vítimas fatais e aumentando, a cada ano, o número de áreas de risco. O objetivo geral desta pesquisa é analisar o grau de risco e a suscetibilidade a escorregamentos translacionais rasos na bacia do rio Limoeiro, loc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/04/2011
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7. Weak Allee effect in a predator-prey system involving distributed delays
In this paper we study the influence of weak Allee effect in a predator-prey system model. This effect is included in the prey equation and we determine conditions for the occurrence of Hopf bifurcation. The stability properties of the system and the biological issues of the memory and Allee models on the coexistence of the two species are studied. Finally w
Computational & Applied Mathematics. Publicado em: 2011
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8. Dinamica populacional do sistema imune aplicada ao sararmpo / Population dynamics of the immune system applied to measles
This work is a study of the interaction between the measles virus and the human immune system from the point of view of the population dynamics. Dynamical systems of first order non linear ordinary differential equations are used to model this population dynamics. Because of the fact that it is possible to observe two different and quite distinct moments in
Publicado em: 2010
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9. MODELOS DE PREVISÃO APLICADOS AO CONTROLE DE QUALIDADE COM DADOS AUTOCORRELACIONADOS / FORECAST MODEL APPLIED TO QUALITY CONTROL WITH AUTOCORRELATIONAL DATA
This research has a topic forecast models applied to industrial productive processes with the objective of verifying the stability of the process through control charts applied to the residues originated from linear and non-linear model. In the presence of autocorrelation data, it was necessary to look for a mathematical model which are produce independent a
Publicado em: 2009
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10. AvaliaÃÃo dos solventes diÃxido de carbono supercrÃtico e propano subcrÃtico na extraÃÃo do Ãleo de girassol / Evaluation of supercritical carbon dioxide and subcritical propane as solvents in the extraction of the sunflower oil
The extraction of oil from greasy seeds is traditionally based in the use of organic solvents. Currently the most used method is the process of extraction by n-hexane. Aiming the obtainment of vegetable oil with higher quality using clean technologies with reduction of oil contamination through solvent and minimizing the damage to the environment is that the
Publicado em: 2009
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11. Desenvolvimento experimental e validaÃÃes do processo catalÃtico (Ni/γ-Al2O3/CeO2-Al2O3) de reforma metano-diÃxido de carbono em reator de leito fluidizado
Carbon dioxide of methane reforming into syngas over Ni/γ-Al2O3 and Ni/CeO2-Al2O3 catalysts was investigated. The Nikel catalysts presented high activity and stability although of the potential of coke formation on its active sites. The development of the dry methane reform for process, main component of natural gÃs (GN), was studied in a fluidized bed
Publicado em: 2009
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12. Controle robusto de sistemas de potência multimáquinas através de desigualdades matriciais lineares: abordagem por alocação de pólos e ajuste de estabilizadores de sistemas de potência. / Robust control of multimachine power systems through linear matrix inequalities: the pole placement approach with power system stabilizers adjustment.
The aim of this work is to elaborate robust control algorithms to power systems. The mathematical model employed to describe the multimachine power system is that used in small signal studies, and the main goal is to increase the damping of the critical eigenvalues of the system, guaranteeing its stability and performance in various operating conditions. To
Publicado em: 2008