Decompositions
Mostrando 13-24 de 40 artigos, teses e dissertações.
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13. Dinâmica econômica das flutuações na produção de cana-de-açúcar / Economic dynamics from fluctuations in the Brazilian sugar cane production
Since the mid 70s, the Brazilian sugar and ethanol markets have passed through noteworthy changes, leading the country back to the position of number one sugar cane producer in the world. The objective of this thesis is to evaluate the whole of shocks in supply (measured by area and yield unexpected variations), in demand (measured by domestic income and exp
Publicado em: 2008
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14. Modelagem tensorial e processamento de sinais por sistemas de comunicaÃÃes de redes / Tensor modeling and signal processing for wireless communication systems
In several signal processing applications for wireless communications, the received signal is multidimensional in nature and may exhibit a multilinear algebraic structure. In this context, the PARAFAC tensor decomposition has been the subject of several works in the past six years. However, generalized tensor decompositions are necessary for covering a wider
Publicado em: 2007
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15. U-tests for variance components in linear mixed models. / Testes de hipóteses para componentes de variância utilizando estatísticas U
We consider decompositions of U-statistics to obtain tests for null variance components in linear mixed models. Their asymptotic distributions under the null hypothesis are obtained only assuming the existence of the first four moments of the conditional error distribution and the existence of the first two moments of the random effects distribution. Thus, t
Publicado em: 2007
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16. Interação genótipos-ambientes e parâmetros de adaptabilidade e estabilidade para características de crescimento em bovinos de corte compostos no Brasil / Genotype-environmental interactions and adaptability and stability parameters for growth traits in composite beef cattle in Brazil.
Data from 111,101 weaning weight adjusted to 205 days (WW), 50,860 yearling weight adjusted to 390 days (YW) and 47,462 weight gain from weaning to yearling (WG) were analyzed to evaluated the genotype-environmental interactions and estimates adaptability parameters for seven genotype combinations of crossbreed beef cattle, raised in three environment of the
Publicado em: 2007
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17. Econometrical assays on the dynamics of the agricultural Gdp / Ensaios economÃtricos sobre a dinÃmica o Pib agrÃcola
The thesis entitled "Econometrical assays on the dynamics of the agricultural Gdp" is composed of three papers. The first article is entitled "Brazilian Agricultural Sector: An Analysis of Microregional Convergence" analyzes the process of agricultural micro regional convergence using the Threshold Model in the period 1970 to 1996. The results show the exist
Publicado em: 2007
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18. International prices and exchange rate: the brazilian case / Preços internacionais e taxa de câmbio: o caso brasileiro
This work analyzes to Brazil one of the most important debates on the New Open Economy Macroeconomic literature: the choice of the currency in which international prices are fixed. There are two possible hypotheses: either the export firm establishes his prices in your own currency, named producer currency pricing (PCP) or the export firm fix his price in th
Publicado em: 2006
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19. O uso de material concreto com representaÃÃes retangulares na construÃÃo do conceito de decomposiÃÃo multiplicativa
This study aims to investigate the effects of using of manipulatives that explore rectangular representations of multiplication to appropriate the concept of multiplicative decomposition of natural numbers by 5th grade students of elementary school. The use of manipulatives was investigated on the basis of the theory of didactic situations, developed by Guy
Publicado em: 2006
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20. APLICAÇÕES DO PRODUTO TENSORIAL EM ANÁLISE NUMÉRICA / APPLICATIONS OF THE TENSOR PRODUCT IN NUMERICAL ANALYSIS
Separation of variables is adequately understood and extended by making use of tensor products. We consider linear transformations admitting tensor decompositions and some recent applications in numerical analysis (Beylkin s algorithm). The examples concern the discretization of the Laplacian on rectangular meshes, its spectral properties and functional calc
Publicado em: 2004
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21. Ciclos do produto brasileiro: decomposição e análise em tempo real . / Brazilian economic cycles: decompositions and real time analysis.
Esta tese é composta de três artigos. O primeiro artigo aplica a metodologia proposta por Chari, Kehoe e McGrattan (2003) para decompor as flutuações da indústria brasileira, usualmente medidas por meio da aplicação de filtros mecânicos. Sugere-se que os ciclos encontrados pela utilização do filtro Hodrick Prescott (ou qualquer filtro band pass) en
Publicado em: 2004
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22. Estudo in situ do efeito do polimento e da proteção superficial no manchamento de ionomeros de vidro modificados por resina
The purpose of this in situ study was to evaluate the effect of polishing and surface protection on staining of resin-modified glass-ionomers (VITREMER e PHOTAC-FIL). lmmediate polishing was compared to delayed polishing that was carried out at different stages of the setting process (1, 24 and 168 hours afier light curing). To evaluate surface protection, t
Publicado em: 2000
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23. Estudo in situ da rugosidade superficial de materiais hibridos de ionomero de vidro e resina composta submetidos a procedimentos de acabamento e polimento em função do tempo de permanencia na cavidade bucal
The purpose of this study was to evaluate the surface roughness of two polyacid modified composite resins and a resin modified glass-ionomer submitted to two finishing and polishing treatments, as afunction oftime, using an in situ experimental modelo A resin modified glassionomer Fuji II LC lmproved (GC) and two polyacid modified composite resins Compogla
Publicado em: 2000
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24. SOFTWARE ARCHITECTURES FOR FAULT-TOLERANT REPLICATIONS AND MULTITHREADED DECOMPOSITIONS : EXPERIMENTS WITH PRACTICAL PARALLEL SIMULATION
This thesis is concerned with the experimental development of parallel simulation tools that not only exploit diverse multiprocessor environments, but also allow parallel simulations to be built with reasonable effort. We work on two fronts: model replication and model decomposition. We describe the design of EcliPSe, a parallel simulation system for replica
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 199608