Cubic Splines
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. A Numerical Mode-Matching Method Based on Multiple-Knot Cubic B-Splines Applied to the Analysis of Well-Logging Tools
Abstract The numerical mode-matching (NMM) technique is a very efficient approach to analyze well-logging tools used for hydrocarbon exploration. This problem is typically modeled as a cylindrically layered medium (subterranean formation) including both horizontal and vertical stratifications. In this paper, we present a new NMM formulation based on the use
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
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2. Analysis of daily body weight of dairy cows in early lactation and associations withproductive and reproductive performance
The objective of this study was to describe daily body weight (BW) changes in the first 100 days of lactation in confined dairy cows and to associate BW loss with productive and reproductive performance. Data included 26,344 daily BW measurements of 372 Holsteins calving between June 2011 and June 2012 in a commercial herd in the South of Brazil. Cows were a
R. Bras. Zootec.. Publicado em: 2015-05
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3. Novas metodologias para compressão de dados de processos e para o ajuste do Sistema PI
The consolidation of the automation in the chemical industry has brought a challenge: translating the large volume of data in useful information. With the advent of digital systems, the expansion in the development of sensors and sampling methods allowed the acquisition of a large amount of data from the process field. Thus, nowadays, engineers and operators
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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4. Spline Dynamic Matrix Controller : uma nova formulação de controladores preditivos lineares
In the field of dynamic simulation, an understanding of the dynamic behavior of chemical processes is important from both process design and process system perspectives. Several methodologies have been developed so far, such as Step Response (SR), Transfer Function (TF) and Discrete State Space representation (DSS). Such approaches, however, have some disadv
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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5. Desigualdade regional de renda e migrações : mobilidade intergeracional educacional e intrageracional de renda no Brasil
A presente tese tem como objetivo analisar as relações entre as variáveis educacionais e a desigualdade de renda no Brasil e suas repercussões no que se refere a mobilidade intergeracional educacional e intrageracional de renda. O objetivo específico é o de verificar como a mobilidade intergeracional educacional e intrageracional de renda se diferencia
Publicado em: 2008
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6. Reconstruindo-se a funÃÃo de densidade Ãssea utilizando-se triÃngulos de BÃzier em dados desestruturados para aprimorar o processo de diagnÃstico da osteoporose
Osteoporose à uma doenÃa caracterizada por uma reduÃÃo da densidade mineral Ãssea e a degeneraÃÃo da microarquitetura Ãssea. Trata-se da mais comum das doenÃas metabÃlicas do osso, atingindo mais que 10,000,000 de brasileiros. Inobstante as origens pediÃtricas da osteoporose, ela raramente manifesta sintomas na infÃncia. Entretanto, a doenÃa tor
Publicado em: 2007
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7. Estudo da convergência no método de elementos finitos aplicado a dispositivos eletromagnéticos não lineares. / Survey on the convergence of non-linear finite element method applied to electromagnetic devices in two-dimension.
This work presents a study on the convergence of non-linear finite analysis applied to the modeling of electromagnetic devices with plane symmetry. Three aspects have been thoroughly investigated which have influence on the convergence performance, namely: the relaxation factor in the Newton-Raphson algorithm, the model of the magnetization curve and the cho
Publicado em: 2007
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8. OTIMIZAÇÃO DE FORMA DE MODELOS BIDIMENSIONAIS DE ELEMENTOS FINITOS COM COMPORTAMENTO ELASTO-PLÁSTICO / OPTIMIZACIÓN DE FORMA DE MODELOS BIDIMENSIONALES DE ELEMENTOS FINITOS CON COMPORTAMIENTO ELÁSTICO-PLÁSTICO / SHAPE OPTIMIZATION OF 2D FINITE ELEMENT MODELS CONSIDERING ELASTO-PLASTIC BEHAVIOUR
The main goal of this work is to present an integrated system for the optimization of plane structures with elastoplastic behavior. The methodology proposes an alternative for the conservative way in which structures traditionally have been optimized, i.e., that they present linear elastic behavior. The computational system is said to be integrated because i
Publicado em: 2000
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9. OTIMIZAÇÃO DE CASCAS SUBMETIDAS A CARREGAMENTO DINÂMICO / OPTIMIZACIÓN DE CASCAS SOMETIDAS A SOBRECARGA DINÁMICA / OPTIMIZATION OF SHELL STRUCTURES UNDER DYNAMIC LOADS
The main goal of this work is to present a methodology and a computer code which allow the designer, by means of optimization techniques, to obtain efficient shapes of plate and shell structures under linear-elastic behavior and dynamic loads. With this objective, it is used the optimization program SHELLD that includes the geometric modeling, the mesh gener
Publicado em: 2000
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10. Sobre a utilização de beta -splines no metodo dos elementos finitos para a solução de barras, vigas e placas finas / About the use of beta -splines functions in finite element method to the solution of Bar and Beam structures and Thin Plates
The present Thesis is a step by step formulation for the use of B-splines Functions in the Finite Element Method to approximate de solution of Bars, Beams and Thin Plates structures. The smooth character of the B-Splines given by the C IND. 2 continuity of these cubic polynomials provides a robust frame to the trial functions, increasing thus convergence and
Publicado em: 1999
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11. FORECASTING DAILY LOAD DATA USING STRUCTURAL MODELS AND CUBIC SPLINE / PREVISÃO DE CARGA DIÁRIA ATRAVÉS DE MODELOS ESTRUTURAIS USANDO SPLINES
Esta tese propõe um modelo para o tratamento de observações diárias e é aplicado na área do setor elétrico, no problema de previsão de carga horária. O modelo proposto é basicamente um modelo estrutural onde a sazonalidade anual (movimentos periódicos dentro do ano) é modelada utilizando a técnica de Splines. Esta té
Publicado em: 1996
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12. A new non-linear normalization method for reducing variability in DNA microarray experiments
A simple and robust non-linear method is presented for normalization using array signal distribution analysis and cubic splines. Both the regression and spline-based methods described performed better than existing linear methods when assessed on the variability of replicate arrays
BioMed Central.