Network Simplex
Mostrando 1-12 de 43 artigos, teses e dissertações.
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1. Methane combustion kinetic rate constants determination: an ill-posed inverse problem analysis
Methane combustion was studied by the Westbrook and Dryer model. This well-established simplified mechanism is very useful in combustion science, for computational effort can be notably reduced. In the inversion procedure to be studied, rate constants are obtained from [CO] concentration data. However, when inherent experimental errors in chemical concentrat
Quím. Nova. Publicado em: 2013
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2. Uso de redes neurais recorrentes na determinação das constantes de acidez para a 7-epiclusianona em misturas etanol-água
This work propose a recursive neural network to solve inverse equilibrium problem. The acidity constants of 7-epiclusianone in ethanol-water binary mixtures were determined from multiwavelength spectrophotmetric data. A linear relationship between acidity constants and the %w/v of ethanol in the solvent mixture was observed. The proposed method efficiency is
Química Nova. Publicado em: 2012
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3. Retrieval of kinetic rates in reactions with semi batch liquid phase using ill-posed inverse problem theory
A neural network procedure to solve inverse chemical kinetic problems is discussed in this work. Rate constants are calculated from the product concentration of an irreversible consecutive reaction: the hydrogenation of Citral molecule, a process with industrial interest. Simulated and experimental data are considered. Errors in the simulated data, up to 7%
Química Nova. Publicado em: 2011
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4. Ion-polymer interaction analysis: an inversion of NMR spin echo experimental data
A methodology for ion-polymer interaction estimation is discussed in the present work. This method is based on the inversion of experimental spin echo NMR data using Hopfield neural network to retrieve transverse relaxation time distributions. The adopted model systems consist of aqueous solutions of poly (ethylene oxide), molar mass 1500, 4000 and 35000 γ
Brazilian Journal of Physics. Publicado em: 2010-12
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5. Estudo de equilÃbrio de troca iÃnica de sistemas binÃrios e ternÃrios por meio de redes neurais / Ion exchange equilibrium of the binary and ternary systems using neural network and mass action law
In the majority of the applications of the process of ionic exchange in the chemical industry some ionic species are gifts that compete between itself for the active small sieges of the ionic exchanger. Therefore, the project of these systems requires an analysis of the coefficients of selectivity of ions gifts in the solution that determines the influence o
Publicado em: 2009
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6. NETWORK SIMPLEX, ALGORITHM E IMPLEMENTATION / SIMPLEX PARA REDES, ALGORITMO E IMPLEMENTAÇÃO
Este trabalho busca desenvolver o método Simplex para Redes na solução de problemas de Fluxo de Custo Mínimo. Este método consiste em uma adaptação do método Simplex primal em que são exploradas as características específicas da rede subjacente ao problema ao se buscar a solução ótima em um número finito de árvores geradoras. A árvore gerado
Publicado em: 2008
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7. A contribution to the study of linear programming / Uma contribuição ao estudo da programação linear
Programação Linear é bastante útil para obter soluções ótimas de problemas relacionados com várias áreas da ciência, tais como, engenharia de produção, indústria de alimentos, ciências da saúde, mineraçãoo, transporte, entre outros. Este trabalho faz uma revisão sobre o assunto, produzindo um texto didático-cientíco que apresenta uma fund
Publicado em: 2008
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8. A contribution to the study of linear programming / Uma contribuiÃÃo ao estudo da programaÃÃo linear
The Linear Programming is quite useful to obtain optimal solutions for problems related to several areas of science, such as, industrial engineering, food industry, health science, mining, transport, among others. This work makes a review about linear programming, producing a didactic-scientific text that presents a consistent theoretical base of the main co
Publicado em: 2008
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9. Calibração de modelos de redes de distribuição de água para abastecimento considerando vazamentos e demandas dirigidas pela pressão / Water distribution network calibration model considering leakage and head-driven demands
Brazils water distribution systems usually present a high percentage of so-called physical losses, of which a significant portion is caused by leakage. Therefore, it is of fundamental importance, not only from the financial standpoint in terms of the pumped and chemically treated water but also particularly from that of the preservation of this natur
Publicado em: 2003
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10. COMPUTATIONAL ASPECTS OF MARKET EVALUATION OF THE DYNAMIC SECURITY ON POWER ELECTRICAL SYSTEMS / ASPECTOS COMPUTACIONAIS E DE MERCADO DA AVALIAÇÃO DA SEGURANÇA DINÂMICA DE SISTEMAS ELÉTRICOS DE POTÊNCIA
In this work, different methodologies for the dynamic security assessment of electric energy systems, the calculation of preventive control measures and the quantification of the economic impact of the generation rescheduling, are used. For the dynamic security assessment the following modules have been adopted: initial data processing and generation of the
Publicado em: 2003
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11. An artificial neural network hydrologic model for urban watersheds. / Modelagem de bacias urbanas com redes neurais artificiais.
Redes Neurais Artificiais (RNA s) vem sendo utilizada em diversas áreas do conhecimento inclusive para a previsão de séries temporais. O objetivo deste trabalho é utilizar uma RNA para o diagnóstico e prognóstico de vazão em bacias urbanas da Região Metropolitana de São Paulo (RMSP) com dados do radar meteorológio de São Paulo e os dados telemétr
Publicado em: 2001
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12. O problema da designação e sua variante parametrica
This dissertation is about the Assignment Problem: given an edge-weighted bipartite graph, find a perfect matching of minimum weight. In the first part of this work we present a detailed survey of the literature on this problem, including basic concepts and main results. In the second part, we discuss a parametric variant of this problem. In this variant, th
Publicado em: 2000