Exponential Gaussian Distribution
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Spatial Variability of Soil Fauna Under Different Land Use and Managements
ABSTRACT Geostatistics allows the evaluation of the distribution pattern of data with high spatial variability in agricultural systems. This study aimed to evaluate the spatial variability of biological diversity indices of soil fauna under different land (agriculture and forest). Samples were collected in seven areas (millet, soybean, corn, eucalyptus, past
Rev. Bras. Ciênc. Solo. Publicado em: 28/05/2018
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2. A Classification for a Geostatistical Index of Spatial Dependence
ABSTRACT: In geostatistical studies, spatial dependence can generally be described by means of the semivariogram or, in complementary form, with a single index followed by its categorization to classify the degree of such dependence. The objective of this study was to construct a categorization for the spatial dependence index (SDI) proposed by Seidel and Ol
Rev. Bras. Ciênc. Solo. Publicado em: 15/12/2016
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3. Comparison of carbon sequestration potential in agricultural and afforestation farming systems
In the last few decades, many forests have been cut down to make room for cultivation and to increase food or energy crops production in developing countries. In this study, carbon sequestration and wood production were evaluated on afforested farms by integrating the Gaussian diameter distribution model and exponential diameter-height model derived from sam
Sci. agric. (Piracicaba, Braz.). Publicado em: 2013-04
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4. 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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5. Simulation of dense colloids
We present in this proceeding recent large scale simulations of dense colloids. On one hand we simulate model clay consisting of nanometric aluminum oxyde spheres in water using realistic effective electrostatic interactions and Van der Waals attractions, known as DLVO potentials and a combination of molecular dynamics (MD) and stochastic rotation dynamics (
Brazilian Journal of Physics. Publicado em: 2008-03
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6. Improvement of Wald residual in generalized linear models / Melhoramento do resíduo de Wald em modelos lineares generalizados
The theory of generalized linear models is very used in statistics, not only for modeling data normally distributed, but in the modeling of data whose distribution belongs to the exponential family of distributions. Some examples are binomial, gamma and inverse Gaussian distribution, among others. After tting a model in order to check the adequacy of tting,
Publicado em: 2008
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7. SMOOTH TRANSITION LOGISTIC REGRESSION MODEL TREE / MODELO DE REGRESSÃO LOGÍSTICA COM TRANSIÇÃO SUAVE ESTRUTURADO POR ÁRVORE (STLR-TREE)
The main goal of this work is to adapt the STR-Tree model, which is the combination of a Smooth Transition with Regression model with Classi cation and Regression Tree (CART), in order to use it in Classification. Some changes were made in its structural form and in the estimation. Due to the fact we are doing binary dependent variables classification, is ne
Publicado em: 2008
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8. Modelo exponencial para opÃÃes: aplicaÃÃes ao Ãndice Ibovespa
In this thesis we perform an empirical analysis of the Brazilian stock and options markets. In the first part of our study we carry out a statistical analysis of the Ibovespa stock index of the SÃo Paulo Stock Exchange. It is shown that the daily returns of Ibovespa follow not a Gaussian distribution but rather an exponential law, in addition, this exponent
Publicado em: 2007
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9. Aplicação da distribuição espectral normal em leito fluidizado gas-solido
A defluidização parcial ou total de partículas sólidas é um fenômeno indesejável em aplicações industriais envolvendo operações com leito fluidizado. Se as mudanças na fluidodinâmica do leito forem detectadas a tempo, pode-se evitar-la com o aumento da velocidade do gás de fluidização e/ou, em alguns casos, mediante a alteração da vazão de
Publicado em: 2007
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10. Modelagem estocastica de facies para caracterização da distribuição espacial das heterogeneidades de reservatorio
The genesis and properties of a depositionaI system can be understood by the use of facies modeIs, which permit the prediction of its spatial distribution and reservoir qualities. The qualitative approach associated to nurnerical data allows the quantification of flow units. The method presented herein is intended to translate geological data into nurnerical
Publicado em: 1992
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11. ON TUNING AND AMPLIFICATION BY LATERAL INHIBITION*
Lateral inhibition in a neural network generally attenuates the amplitudes of the responses to sinusoidal stimuli—both spatial and temporal. For an inhibitory influence with an abrupt onset and an exponential decay in time, and with a Gaussian distribution in space (the forms often assumed in theoretical calculations), the attenuation is greatest at low te
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12. Characteristics of miniature inhibitory postsynaptic currents in CA1 pyramidal neurones of rat hippocampus.
1. Recordings were made in vitro from chloride-loaded CA1 rat hippocampal pyramidal neurones in the presence of tetrodotoxin (TTX) to examine miniature inhibitory postsynaptic currents (IPSCs). 2. Most spontaneous synaptic events recorded before TTX was applied, and all events that were resolved in the presence of TTX, were blocked by the GABAA receptor anta