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国家自然科学基金(11171293)

作品数:3 被引量:7H指数:1
相关作者:王学仁夏天更多>>
相关机构:贵州财经大学云南大学更多>>
发文基金:国家自然科学基金贵州省自然科学基金国家社会科学基金更多>>
相关领域:理学更多>>

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DFT Study on the Antioxidant Activity of a Modeled p-Terphenyl Derivative被引量:1
2012年
Relationships between the structure characteristics of natural p-terphenyl com- pounds isolated from three edible mushrooms (Thelephora ganbajun, Thelephora aeronautical, and Boletopsis grisea) indigenous to China and their mechanism of antioxidant activity were studied. Geometry structures of terphenyl molecule and four corresponding radicals, bond dissociation energy (BDE), frontier orbitals (HOMO and LUMO) and single electron density were calculated using DFT methods (B3LYP/6-311G**). The computational results which are consistent with the experimental data well show that terphenyl molecule scavenges DPPH radical by hydrogen abstract mechanism and the high antioxidant activity depends on the substitution position of hydroxyls. Two active 7-, 8-hydroxyls facilitate the hydrogen abstraction due to the intramolecular hydrogen bond and the resonance effect makes 4-hydroxyl radical more stable.
王传铭潘蓄林
关键词:TERPHENYLANTIOXIDANT
Hierarchical Mixture Models for Zero-inflated Correlated Count Data
2016年
Count data with excess zeros are often encountered in many medical, biomedical and public health applications. In this paper, an extension of zero-inflated Poisson mixed regression models is presented for dealing with multilevel data set, referred as hierarchical mixture zero-inflated Poisson mixed regression models. A stochastic EM algorithm is developed for obtaining the ML estimates of interested parameters and a model comparison is also considered for comparing models with different latent classes through BIC criterion. An application to the analysis of count data from a Shanghai Adolescence Fitness Survey and a simulation study illustrate the usefulness and effectiveness of our methodologies.
Xue-dong CHENHong-xing SHIXue-ren WANG
关键词:ZERO-INFLATION
用积分变换法求连续型随机变量函数的密度函数被引量:6
2013年
设X是一个连续型随机变量,其密度函数为px(x),g(x)是一个连续函数,给出了用积分变换求随机变量X的函数9(X)的密度函数的一个方法.该方法比传统的方法更简单.
夏天王学仁
关键词:连续型随机变量密度函数
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