Growth Exponent
Mostrando 1-12 de 25 artigos, teses e dissertações.
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1. Influence of sintering parameters on the microstructure and mechanical properties of nanosized 3Y-TZP ceramics
Abstract The fracture toughness of 3Y-TZP ceramics obtained from a nanocrystalline powder with an optimized microstructure and highly transformable tetragonal grains was investigated. Samples of ZrO2-3 mol% Y2O3 were sintered at temperatures between 1250 and 1400 °C, with isothermal holding times of up to 16 h. Samples sintered at 1250 °C exhibited relativ
Cerâmica. Publicado em: 2021-03
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2. Determinação do expoente de crescimento de padrões formados em meios granulares / Determination of the growth exponent from patterns formed in granular media
Neste trabalho estudamos os padrões formados experimentalmente em sistemas granulares com simetria radial. Em especial avaliamos se o expoente de crescimento β depende da origem usada para calcular a largura da interface. Para tanto foi feito um programa em linguagem Fortran que reconhece a borda do padrão e calcula a distância de cada ponto da borda
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/07/2011
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3. Generating more realistic complex networks from power-law distribution of fitness
In this work we analyze the implications of using a power law distribution of vertice's quality in the growth dynamics of a network studied by Bianconi and Barabási. Using this suggested distribution we show the degree distribution interpolates the Barabási et al. model and Bianconi et al. model. This modified model (with power law distribution) can help u
Brazilian Journal of Physics. Publicado em: 2009-08
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4. Multicamadas magnéticas de telureto de európio e semicondutores iv-vi crescidas por epitaxia de feixe molecular / Magnetic multilayers of europium telluride and IV-VI semiconductors grown by molecular beam epitaxy
In this work, thin EuTe films and EuTe/PbTe(SnTe) superlattices were grown, and their structural and magnetic properties were characterized. The molecular beam epitaxial growth parameters of the samples were optimized, particularly those of the EuTe/SnTe SLs. To this goal, the growth modes of EuTe on SnTe and vice versa were investigated, and the influence o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/10/2008
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5. Correlação de velocidade em um modelo de corrosão
Surface growth is an area whose methods apply to many systems on nature. On this work we review the growth process, with emphasis on the general growth relations, such as the KPZ equation and on the critical exponents universality. As a practical example we study a model where a corrosive liquid acts over a solid. Our main contribution is shown on chapter 3
Publicado em: 2008
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6. Estudo do efeito da fragmentação do habitat sobre padrões de biodiversidade
Despite the complexity of factors that influence the growth and dispersion of individuals in species, some general patterns are observed in the study of ecosystems. One of these patterns is the relationship between the number of species and the size of the area occupied by these species (species-area relationship). This relationship is one of the oldest rule
Publicado em: 2008
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7. SimulaÃÃo de fluidos imiscÃveis em meios porosos atravÃs de autÃmatos celulares de gÃs na rede
In this study, we investigated the displacement of two immiscible fluids in bidimensional porous media by means of models of lattice gas cellular automata. Such an automaton can reproduce the behavior of the Navier-Stokes equation, along with the Laplace equation for the case of two immiscible fluids and, besides, can implement conditions of complex contour
Publicado em: 2007
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8. Crescimento de trinca subcrítico em cerâmicas odontológicas: efeito do material (microestrutura) e do método de ensaio / Growth of crack subcrítico in dental ceramics: effect of the material (Microstructure) and the test method
The objective of this study was to determine the mechanical properties and the microstructure of different dental ceramics in order to understand their influence on the slow crack growth (SCG) parameters, n (crack growth exponent) and ?f0, (scaling parameter), determined by different methods. The five ceramics tested were: porcelains VM7 (Vita) and D (d.Sign
Publicado em: 2007
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9. Schistosomal granuloma as a system adaptive complex. Application of fractal dimension in characterization of their geometric properties. / Granuloma esquistossomótico como um sistema adaptativo complexo. Aplicação da dimensão fractal na caracterização de suas propriedades geométricas.
Schistosomal granuloma AS A COMPLEX ADAPTIVE SYSTEM: APPLICATION OF FRACTAL DIMENSION IN THE CHARACTERIZATION OF PROPERTIES GEOMETRIC. Waldemiro de Souza Romagna. [Introduction]. The schistosomal granuloma is a compact, organized collection of migrating cells, which along with cells of the affected organ, arrange themselves in the midst of extracellular matr
Publicado em: 2007
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10. Scaling laws in PZT thin films grown on Si(001) and Nb-Doped SrTiO3(001) substrates
A dynamic scaling and kinetic roughening study was done on digitized atomic force microscope (AFM) images of Pb(Zr0.52,Ti0.48)O3 (PZT) thin films. The films were grown on Si(001) and Nb - SrTiO3(001) (STNO) substrates via rf-sputtering technique at high oxygen pressures at substrate temperatures of 600 ºC by varying the deposition time and keeping other gro
Brazilian Journal of Physics. Publicado em: 2006-09
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11. Conductivity fluctuation of YBa2Cu3O7 - delta/Sr2YSbO6/SrTiO3 thin films
Thermal fluctuations in the electric conductivity of YBa2Cu3O7 - delta superconducting thin films grown on Sr2YSbO6 novel substrate materials in the film form were experimentally studied. YBa2Cu3O7 - delta films were grown by using a dc-technique on Sr2YSbO6 substrates, which were produced by rf magnetron sputtering. X-ray diffraction analysis evidenced that
Brazilian Journal of Physics. Publicado em: 2006-09
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12. Dinâmica crítica de modelos de spin, autômatos celulares e polipeptídeos. / Critical dynamics of spin models, cellular automata and polypeptides.
In this work we investigated dynamic properties of statistical mechanical models at criticality. At first, using the concepts of global persistence and anomalous dimension of initial magnetization, we showed that the Baxter-Wu model does not belong to the same universality class as 4-state Potts model and Ising with multispin interaction in one direction. In
Publicado em: 2005