High Order Numerical Methods
Mostrando 13-24 de 47 artigos, teses e dissertações.
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13. Vibroacustografia na avaliação tridimensional de artroplastia total de quadril / Vibro-acoustography in the tridimensional evaluation of total hip arthroplasty
Vibro-acoustography (VA) is a high lateral resolution (<0.7 mm), speckle-free, non- ionizing and non-invasive image based on the nonlinear combination phenomenon of ultrasound waves (MHz) that generates a narrow focus region of low frequency (kHz). In this work, we propose a VA-based tridimensional evaluation of the exposed area of implants, after total hip
Publicado em: 2011
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14. Árvores de Steiner: Teoria, Geração Numérica e Aplicações / Steiner trees: Theory, Numerical Generation and Applications
Given a set of points in the plane, which we call terminals, one proves that they are always connected by a minimal graph called Steiner tree. The terminals may represent main connection route points, circuit elements or network computer servers. That is, the problem is to optimize traffic among the terminals whenever this is represented by a tree of shortes
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/12/2009
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15. Análise da transformada wavelet direcional adaptativa na codificação de imagens
This work presents a method for the numerical stability analysis of adaptive lifting-based directional transforms. The goal is to investigate the relation between the directions set in the lifting scheme and the reconstruction quality of the corresponding bases. This new method is based on the variation in frequency of the condition number of the synthesis p
Publicado em: 2009
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16. Superfícies de pontos dinâmicas / Dynamic point set surfaces
The study of the behaviour of fluids is an ancient field in natural sciences. Recently, engineering phenomena that were empirically studied started to be done with computacional aid. The Computational Fluid Dynamics (CFD) is the area of science that studies computational methods for computer simulation of fluid flow, and often is the most practical way, or t
Publicado em: 2009
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17. Computação evolutiva na resolução de equações diferenciais ordinárias não lineares no espaço de Hilbert. / Evolutive computation in the resolution of non-linear ordiinary diferential equations in the Hilbert space.
This thesis shows a new method to get polynomial solutions to the initial value problems (IVP), with an error margin comparable to the consecrate numerical methods (NM), for both the function and its derivatives. The method works with differential equations (DEs) linear or not, beeing the developed tolls available until 4th order, whose can be expanded to hi
Publicado em: 2009
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18. Simulações numéricas de Monte Carlo aplicadas no estudo das transições de fase do modelo de Ising dipolar bidimensional / Numerical Monte Carlo simulations applied to study of phase transitions in two-dimensional dipolar Ising model
Two-dimensional spin model with nearest-neighbor ferromagnetic interaction and long-range dipolar interactions exhibit a rich phase diagram, whose characteristics have been exploited by several studies in the recent literature. Furthermore, the possibility of explain observed phenomena in ultrathin magnetic films, which have many technological applications,
Publicado em: 2009
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19. Study of the source and drain series resistance in SOI FinFETs triple gate transistors and with strained channel. / Estudo da resistência série de fonte e dreno de transistores SOI FinFETs de porta tripla e com canal tensionado.
This work presents the study of the source and drain series resistance behavior in standard and strained SOI FinFETs triple gate transistors. In SOI FinFETs transistors there is an increase of the source and drain series resistance due to the narrow of these regions, being this parameter a key limiting factor to the next generations. The use of strained tran
Publicado em: 2009
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20. Partition of root water extraction between soil layers with distinct hydraulic properties / Partição da extração da água do solo por plantas entre camadas com propriedades hidráulicas distintas
Root water extraction is determined by soil hydraulic conductivity and water potential gradients, both dependent on soil water content. In this dissertation the experimental test of a root water extraction and partition model is described for a plant whose root system is divided over soil layers with distinct hydraulic properties. An experiment was conducted
Publicado em: 2009
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21. Análise da variação da concentração de amônia, dos aminoácidos alanina e glutamina e do dipeptídeo alanil-glutamina no meio de cultura de embriões humanos e os efeitos na reprodução assistida / Analysis of the variation of the concentrations of ammonium, alanine, glutamine, and alanyl-glutamine in culture medium of human embryos and the effects on assisted reproduction / Analysis of the variation of the concentrations of ammonium, alanine, glutamine, and alanyl-glutamine in culture medium of human embryos and the effects on assisted reproduction / Análise da variação da concentração de amônia, dos aminoácidos alanina e glutamina e do dipeptídeo alanil-glutamina no meio de cultura de embriões humanos e os efeitos na reprodução assistida
Objective: to verify the relations between culture media concentrations of ammonia, alanine, glutamine, and alanyl-glutamine and embryo quality, pregnancy, and type of hormonal stimulation. Methods: a prospective case-control study was carried out including 62 embryos from 20 women submitted to assisted reproduction at the Sao Paulo Federal University. Inclu
Publicado em: 2009
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22. Regime não-linear de trens de ondas modulados na direção transversal em um escoamento de Poiseuille plano / The nonlinear regime of spanwise modulated wavetrains in a plane Poiseuille flow
The current thesis had three objectives. The first objective was to develop a code of direct numerical simulation (DNS) to simulation of waves of instability in a plane Poiseuille flow. The other main objective was to analyze it through the method of manufactured solutions (MMS). Finally, a third objective was to study the nonlinear regime of spanwise modula
Publicado em: 2008
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23. APLICAÇÃO DO MÉTODO DAS DIFERENÇAS FINITAS NO DOMÍNIO DO TEMPO NA ANÁLISE DE COBERTURA EM AMBIENTES INTERIORES / APPLICATION OF FINITE DIFFERENCE TIME DOMAIN IN THE ANALYSIS OF INDOOR COVERAGE
The growing interest in broadband wireless local networks and high trans- mission rates requires an increasingly reliable modeling of radio propagation channels, specially for indoor scenarios. The use of optical methods of elec- tromagnetic field tracking along (ray) trajectories between transmission and observation points, via high-frequency analysis of sc
Publicado em: 2008
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24. Simulation of non-periodics flows using the fourier pseudo-spectral and immersed boundary methods / Simulação de escoamentos não-periódicos utilizando as metodologias pseudo-espectral e da fronteira imersa acopladas
Modern engineering increasingly requires the comprehension of phenomena related to combustion, aeroacustics, turbulence transition, among others. For these purposes the Computational Fluids Dynamics (CFD) requires the used high order methods. One of these methods is the Fourier pseudo-spectral method, that provides an excellent numerical accuracy, and with t
Publicado em: 2007