Numerical Sequences
Mostrando 13-24 de 59 artigos, teses e dissertações.
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13. From sequences of geometrical patterns to the introduction to algebraic thought / Das seqüências de padrões geométricos à introdução ao pensamento algébrico
The aim of this research is to study the introduction to the geometrical thought by means of sequences of geometrical patterns. Furthermore, we present an approach to pre-algebra in the elementary education and a discussion on the learning of such subject by means of a didactical series consisting of eight activities elaborated from the use of a series of ge
Publicado em: 2003
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14. Estudo das transformações de fase de aços TRIP ao Si-Mn microligados com Nb. / Phase transformations study on Nb microalloyed Mn - Si TRIP steels.
The phase transformation kinetics of five Nb microalloyed Si-Mn TRIP steels was studied under continuous cooling and isothermal treatments, using dilatometric techniques, morphologic characterization, Thermocalc computational thermodynamics and Dictra numerical simulation. WDS and EDS X-ray microanalysis and Dictra numerical modeling of C, Mn and Si distribu
Publicado em: 2003
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15. Evolutionary aging models: reproductive regimes and the Y chromosome degeneration. / Modelos evolucionários de envelhecimento: regimes reprodutivos e a degeneração do cromossomo Y.
Aging theories can be classified in two types: biochemical theory and evolutionary theory. The biochemical theories explain ageing due to imperfections on the biochemical process responsible for the maintenance of life. The evolutionary theories explain aging without any biochemical mechanisms. They support only adaptive strategies, such as reproduction, her
Publicado em: 2003
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16. Seqüências numéricas: um estudo da convergência através de atividades
This study discribes research performed with the help of activities that place great emphasis upon the students actions. Teaching and learning the concepts connected with limits and infinite has proved a hard task, often with unsatisfactory results. In France, Aline Robert has done research with over 1.300 students on the acquisition of the concept of conver
Publicado em: 2001
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17. Pulse response based control for positive definite systems
Pulse Response Based Control (PRBC) is a recently developed minimum time control method for flexible structures. The flexible behavior of the structure is represented through a set of discrete time sequences, which are the responses of the structure due to rectangular force pulses. The rectangular force pulses are given by the actuators that control the stru
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2000
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18. Application of the finite element method in cold forging processes
The demand for more efficient manufacturing processes has been increasing in the last few years. The cold forging process is presented as a possible solution, because it allows the production of parts with a good surface finish and with good mechanical properties. Nevertheless, the cold forming sequence design is very empirical and it is based on the designe
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2000
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19. CONTROL PROBLEM SOLUTIONS BY FREQUENCY DEPENDENT BMIS AND LMIS / SOLUÇÃO DE PROBLEMAS DE CONTROLE VIA BMIS E LMIS DEPENDENTES DA FREQÜÊNCIA
In this thesis, it is proposed and analysed in terms of the global-convergence property a new algorithm for solving quadratic optimisation problems under either a BMI (bilinear matrix inequality) or a frequency-dependent LMI (linear matrix inequality) constraints. These problems are of special interest in the control literature a some very important control
Publicado em: 2000
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20. ONLINE TRAINING OF NEURAL METWORKS: METHODOLOGY FOR TIME VARYING ENVIRONMENTS / TREINAMENTO CONTÍNUO EM REDES NEURAIS: UM TRATAMENTO PARA AMBIENTES VARIANTES NO TEMPO
The main issue when dealing with non-stationary processes is related to the requirement of fast adaptation while simultaneously preventing catastrophic damage to previously learned behavior. In this thesis, two on-line learning techniques, one for supervised and the other for unsupervised artificial neural networks, are proposed. A new supervised procedure t
Publicado em: 1998
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21. Efeito do movimento em MRI e implementação das técnicas de Gradient Moment Nulling e pré-saturação especial na redução de artefatos relacionados ao movimento. / Motion effects in magnetic resonance imaging and implementation of Gradient Moment Nulling and spatial presaturation for reducing motion related artifacts.
The purpose of this work was to analyze the effects of motion in conventional Magnetic Resonance Imaging (MRI), and to implement and optimize the Gradient Moment Nulling and Spatial Presaturation techniques, which can be used to minimize the motion related artifacts. Numerical simulations, were used to analyze the influence of the motion on the image and to
Publicado em: 1998
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22. Numerical classification of coding sequences.
DNA sequences coding for protein may be represented by counts of nucleotides or codons. A complete reading frame may be abbreviated by its base count, e.g. A76C158G121T74, or with the corresponding codon table, e.g. (AAA)0(AAC)1(AAG)9 ... (TTT)0. We propose that these numerical designations be used to augment current methods of sequence annotation. Because b
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23. A common structural feature in promoter sequences of E. coli.
We have searched promoter regions of E. coli, structural genes of the same organism, and computer-generated random sequence DNA for the occurrence of common structural features. This is done by converting the base sequence to a series of numbers representing the sequence of helix twist angles and examining these numerical sequences statistically. Common stru
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24. Statistical geometry in sequence space: a method of quantitative comparative sequence analysis.
A statistical method of comparative sequence analysis that combines horizontal and vertical correlations among aligned sequences is introduced. It is based on the analysis mainly of quartet combinations of sequences considered as geometric configurations in sequence space. Numerical invariants related to relative internal segment lengths are assigned to each