Weibull Function
Mostrando 13-24 de 38 artigos, teses e dissertações.
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13. Métodos de ajuste da função Weibull e seu desempenho na prognose do crescimento e produção de Eucalyptus dunnii
The main objective of this research was to develop a simulator system of growth and yield for unthinned plantations of Eucalyptus dunnii using different adjustment methods for the Weibull probability density function to describe the forest structure at various ages. The data used in this research came from measurements of 239 plots in E. dunnii stands in the
Publicado em: 2010
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14. Foam-forming properties of Ilex paraguariensis (mate) saponin: foamability and foam lifetime analysis by Weibull equation
Saponins are natural soaplike foam-forming compounds widely used in foods, cosmetic and pharmaceutical preparations. In this work foamability and foam lifetime of foams obtained from Ilex paraguariensis unripe fruits were analyzed. Polysorbate 80 and sodium dodecyl sulfate were used as reference surfactants. Aiming a better data understanding a linearized 4-
Química Nova. Publicado em: 2010
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15. The log-exponentiated generalized gamma regression model with censored data / Modelo de regressão log-gama generalizado exponenciado com dados censurados
In the present study, we propose a regression model using the exponentiated generalized gama (EGG) distribution for censored data, this new distribution is an extension of the generalized gama distribution. The EGG distribution (CORDEIRO et al., 2009) that has four parameters it can model survival data when the risk function is increasing, decreasing, form o
Publicado em: 2010
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16. Probability distribution and sample dimension for particle size in forage grasses / Distribuição de probabilidade e dimensionamento amostral para tamanho de partícula em gramíneas forrageiras
The purpose of this study was to identify the probability distribution of variable particle size in forages grasses and to do a sample dimension. For this was carried out an exploratory analysis of the data obtained from the experiment planned in randomized blocks. Each sample of the overall data was adjusted to Normal, Gama, Beta and Weibull distributions.
Publicado em: 2009
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17. Modelos não-lineares de regressão : alguns aspectos de teoria assintótica
The main objective in this dissertation is to derive expressions for the second-order biases of the maximum likelihood estimators of the parameters of the Weibull generalized linear model (WGLM), which are useful to define corrected estimators. In order to reduce the bias of these estimators in finite sample sizes, the method of bias correction introduced by
Publicado em: 2009
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18. Modelos de regressão quando a função de taxa de falha não é monótona e o modelo probabilístico beta Weibull modificada / Regression models when the failure rate function is no monotone and the new beta modified Weibull model
Em aplicações na área de análise de sobrevivência, é freqüente a ocorrência de função de taxa de falha em forma de U ou unimodal, isto e, funções não-monótonas. Os modelos de regressão comumente usados para dados de sobrevivência são log-Weibull, função de taxa de falha monótona, e log-logística, função de taxa de falha decrescente ou
Publicado em: 2009
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19. Contribuições teoricas para o estudo de funções de distribuição correlacionadas em um canal sem fio / Theoretical contributions to the study of correlated distributions funcions of wireless channels
In wireless communications, the multipath fading is modeled by several distributions including Hoyt, Rayleigh, Weibull, Nakagami-m, and Rice. In this thesis, new, exact expressions for the bivariate Hoyt (Nakagami-q) processes with arbitrary correlation in a nonstationary environment are derived. More specifically, the following are obtained: joint probabili
Publicado em: 2009
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20. PARÂMETROS DE IRRIGAÇÃO POR ANÁLISE NUMÉRICA PARA A CULTURA DO MILHO NA REGIÃO CENTRAL DO RIO GRANDE DO SUL / PARAMETERS OF IRRIGATION BY NUMERICAL ANALYSIS FOR MAIZE IN THE CENTRAL AREA OF RIO GRANDE DO SUL
O milho é uma das principais culturas da Agricultura Brasileira. A cultura sofre grandes perdas quando submetida a deficiência hídrica. Para contornar esse problema e evitar a baixa disponibilidade de água no solo, a irrigação do milho é a principal alternativa. Mas para isso ocorrer de forma satisfatória é necessário conhecer os parâmetros de irr
Publicado em: 2009
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21. On superstatistical multiplicative-noise processes
In this article we analyse the long-term probability density function of non-stationary dynamical processes with time varying multiplicative noise exponents which are enclosed inwards the Feller class of processes. The update in the value of the exponent occurs in the same conditions as presented by BECK and COHEN for superstatistics. Moreover, we are able t
Brazilian Journal of Physics. Publicado em: 2008-06
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22. Análise de sobrevivência do tomateiro a Phytophthora infestans / Analysis of the survival of the tomato plant Phytophthora infestans
Reburning caused by Phytophthora infestansis is characterized as an aggressive disease of great destructive impact, capable of limiting or even hindering the economic cultivation of the tomato plant under conditions of high humidity and low temperatures. In view of the problems reburning can cause to tomato plant crops, this work aimed to: 1) fit models to d
Publicado em: 2008
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23. Energetic and protein diet for adults of Apis mellifera Linnaeus 1758 (Hymenoptera: Apidae). / Dietas energÃticas e protÃicas para adultos de Apis mellifera Linnaeus, 1758 (Hymenoptera: Apidae)
The diet fed to adults of Apis mellifera in confinement is a relevant factor in the survival of these insects. In times of nectar shortage, a feeding supplementation with a solution of hydrolyzed sucrose through acid and heating can be given to the hive; citric acid found in lemon juice could be used. In this research, the survival of these confined insects
Publicado em: 2008
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24. Modelo de distribuição de diâmetros para clones de eucalipto em sistema agroflorestal / A diameter distribution model for even-aged agroforest stand of eucalyptus clones
The objective of this study was to develop and evaluate a diameter distribution model of even-aged agroforest stand of eucalyptus clones. The data comes from an agroforest stand, owned by the Aço-Florestal Ltda. company that belongs to the Votorantim group, located in the northwest region of the Minas Gerais State, Brazil. The recovery of the diameter distr
Publicado em: 2007