Kurtosis
Mostrando 13-24 de 39 artigos, teses e dissertações.
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13. Efeito da dieta à base de Cogumelo do Sol (Agaricus blazei, Murrill) no parênquima pulmonar de ratos submetidos a estímulo carcinogênico pela nitrosamina 4-metilnitrosamina-1-3piridil-1 butanona (NNK) / Effect of diet of sun mushroom (Agaricus blazei Murrill) in the lung parenchyma of rats subjected to stimulation with the carcinogen nitrosamine-4-1-metilnitrosamine 3piridil-1butanone (NNK)
The mushrooms have been used for many years as food for its nutritional value and/or as a therapeutic agent. One of the most studied fungus is currently the Agaricus blazei Murrill, popularly Known as Cogumelo do Sol, for its beneficial credited in the prevention of cancer. This study examined the effects of ingestion of A. blazei in the lung parenchyma of w
Publicado em: 2010
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14. Synchronization in intermittent turbulence and spatiotemporal chaos in the solar-terrestrial environment / Sincronização em turbulência intermitente e caos espaço-temporal no ambiente solar-terrestre
In this work we analyze synchronization due to multiscale interactions in observations of intermittent turbulence and numerical simulations of spatiotemporal intermittency in neutral fluids and space plasmas. This study is carried out in two parts. First, we apply two distinct nonlinear techniques, kurtosis and phase coherence index, to measure the degree of
Publicado em: 2010
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15. Synchronization in intermittent turbulence and spatiotemporal chaos in the solar-terrestrial environment / Sincronização em turbulência intermitente e caos espaço-temporal no ambiente solar-terrestre
In this work we analyze synchronization due to multiscale interactions in observations of intermittent turbulence and numerical simulations of spatiotemporal intermittency in neutral fluids and space plasmas. This study is carried out in two parts. First, we apply two distinct nonlinear techniques, kurtosis and phase coherence index, to measure the degree of
Publicado em: 2010
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16. Análise dos resultados das participantes em uma copa escolar de ginástica artística
Este estudo teve como objetivo principal analisar os resultados das ginastas, participantes da Copa Escolar de Ginástica Artística. A presente investigação caracterizou-se como um estudo do tipo ex post fato descritivo. Através dos registros da Federação Riograndense de Ginástica, foi feita uma análise dos resultados para averiguar se há aumento da
Publicado em: 2010
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17. Comparisons between two wavelet functions in extracting coherent structures from solar wind time series
Nowadays, wavelet analysis of turbulent flows have become increasingly popular. However, the study of geometric characteristics from wavelet functions is still poorly explored. In this work we compare the performance of two wavelet functions in extracting the coherent structures from solar wind velocity time series. The data series are from years 1996 to 200
Brazilian Journal of Physics. Publicado em: 2009-03
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18. Modelos lineares com erros slash-elÃpticos: uma abordagem em influÃncia local
We propose a linear regression model with distribution of errors slash-elliptical. The slash-elliptical distribution was recently proposed by GÃmez, Quintana and Torres (2007). The main feature of the slash-elliptical distribution is to have greater flexibility in the degree of kurtosis front the elliptical distributions, and include the elliptical family a
Publicado em: 2009
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19. EficiÃncia do mercado acionÃrio brasileiro : retorno das aÃÃes negociadas na Bovespa, variÃveis macroeconÃmicas, causalidade e fatores condicionantes
Market efficiency is one of the most relevant fields of investigation among modern financial theory that has been developed from its theoretical perspective as well as from its practical relevance. The general objective of this research was to investigate Brazilianâs stock market efficiency under the focus of causality. The specific objectives aimed to char
Publicado em: 2009
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20. Asset pricing with skewness and kurtosis: testing co-moments with panel data / Apreçamento de ativos com assimetria e curtose: um teste de comomentos com dados em painel
Ao longo dos anos, desde a concepção do CAPM, o modelo vem passando por um rigoroso escrutínio por parte da comunidade científica e dos agentes de mercado interessados na sua utilização prática. Evidências tanto a favor quanto contra a sua adequação foram surgindo. Várias foram as causas levantadas para o fraco desempenho do CAPM: omissão de vari
Publicado em: 2008
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21. Kinetic theory of Hamiltonian maps / Teoria cinética de mapas hamiltonianos
This work consists in the study of the transport properties of chaotic Hamiltonian systems by using projection operator techniques. Such systems can exhibit deterministic diffusion and display an approach to equilibrium. We show that this diffusive behavior can be viewd as a spectral property of the associated Perron-Frobenius operator. In particular, the le
Publicado em: 2007
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22. Evaluation of carbon steel welded plates with magnetic Barkhausen noise. / Avaliação de juntas soldadas de aços carbono através do ruído magnético de Barkhausen.
Quando os materiais ferromagnéticos se submetem a campos magnéticos variáveis, experimentam uma mudança na indução que acontece de forma discreta constituindo os saltos de Barkhausen. Estes saltos são conseqüência da interação entre as paredes de domínio se movimentando e os pontos de ancoragem que atuam como barreiras à sua movimentação. Se d
Publicado em: 2007
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23. Estudo epidemiolÃgico e imunohistoquÃmico com BAX, BCL-2 E P27 em carcinoma espinocelular invasivo da boca / Epidemiological and immunohistochemical study with BAX, BCL-2 and P27 in invasive oral squamous cell carcinoma
The evaluation of the expression of bax, bcl-2 and p27 proteins at invasive squamous cell carcinoma of oral cavity was done using the immunohistochemistry technique to know about apoptotic profile of these neoplasms. The epidemiological factors and the clinical behavior of the patients were detected, too. Statistical parameters different from odds ratio was
Publicado em: 2007
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24. In-process grinding monitoring through acoustic emission
This work aims to investigate the efficiency of digital signal processing tools of acoustic emission signals in order to detect thermal damages in grinding processes. To accomplish such a goal, an experimental work was carried out for 15 runs in a surface grinding machine operating with an aluminum oxide grinding wheel and ABNT 1045 Steel as work material. T
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-03