从几个次序统计量出发的二参数Weibull分布的参数估计

从两个或三个次序统计量出发，讨论了二参数Weibull分布的参数估计问题，在实际数据的缺失、删失、截尾等情况下，为可靠性试验的数据处理提供了一种有效的估计方法．     

Intermediate view synthesis from stereoscopic images

1.INTRODUCTION Stereoscopicimagesandvideohavebeensuccessfully exploitedinmedicine,remoteguidance,computer aideddesignandentertainmentforaboutadecade[1].Inrecentyears,withthedevelopmentof3Dtech niques,somenewfunctionsaredemandedforsuch systems.Oneofthedesirablefunctionsisthe“con tinuouslook around”-visualizationof3Ddataonthe screenfromdifferentviewingangles.Theviewer shouldbeabletoacquirecorrespondingviewswhen hemoveshishead.Thisisequivalenttopositioninga stereocamerainthe3Dsceneinaccor…     

Radiation embryology

Summary Prenatal development, characterized by intensive cell proliferation, cell differentiation and cell migration, shows a high radiosensitivity. Therefore, radiation exposure of embryos and fetuses is of great concern for radiological protection and human health. Irradiation during gestation can cause death, growth disorders, malformations, functional impairment and malignant diseases in childhood. These effects are strongly dependent on the developmental stage at exposure and on the radiation dose. The first trimester of pregnancy is regarded as the period with the highest risk for malformation and cancer induction. The developing nervous system shows a special susceptibility to ionizing radiation over a long period and is therefore of great significance for risk estimation. Knowledge about radiation effects on prenatal development has been derived from animal experimentation and from the exposure of human embryos. There is evidence that doses between 1 and 10 cGy may lead to developmental anomalies and that the radiation response can be modified by additional factors.     

Harmonic Retrieval Embedded in Hybrid Colored Noise: a Novel Pisarenko Method Based on Cross-high-order Cumulant

Spectral estimation method is an effective method in the case of parameter estimation of sinusoid signal in noises.It always applies cross-spectral estimation theory and high-order self-spectral estimation methods up to now.Yule-Walker equation based on cross-fourth-order cumulant is developed and Pisarenko method is provided in this paper.Simulation results show that the method is effective to retrieve sinusoid signal frequencies from hybrid colored noises and has good performance.     

载流导体径向电场的数值估算

应用经典电磁理论,推出了载有恒定电流导体内部存在径向电场的表达式,并对导体内部的径向电场及表面电势进行了估算.结果表明,导体内径向电场是微小的.计算出电流强度为200A,导线截面为1cm2的铜导线,其内部径向电场强度约为1.13×10-6V/m.     

公路建设项目后评价指标体系研究

围绕公路建设项目目标评价、过程评价、效益评价、环境影响评价和可持续性评价6个部分建立后评价指标,最终形成一套完整的公路建设项目后评价指标体系,对公路建设项目后评价研究起到必要的补充和完善.     

基于小波变换的LMSV模型波动长记忆性估计与检验

将小波引入到LMSV模型波动长记忆性的估计与检验中，提出了基于小波变换的LMSV模型波动长记忆性的伪极大似然估计法和波动长记忆性的检验方法，用不同参数值和样本容量的数据进行了模拟实验．又用该方法对上海和深圳证券交易所综合指数收益序列的LMSV模型的波动长记忆性进行了检验和估计，结果表明该方法是有效且可行的．     

股票波动率的高频率数据估计及实证分析

用分类方法，直接采用高频率数据来估计股票市场普通个股风险(总波动率)三个组成部分：整个市场水平波动率、特定行业水平波动率和特定厂商水平波动率，对中国股票市场进行了实证分析。     

城市路面径流雨水铅含量的测定

采用微波消解技术作为测定城市路面径流雨水中铅的预处理方法，研究了碘化钾一甲基异丁基甲酮（KI—MIBK）萃取火焰原子吸收分光光度法（AAS）测定城市路面径流雨水中的微量铅。这种消解方法只需12min就可达到对含铅水样完全消解的目的，该方法无论从时间上还是从能耗上明显优于样品的传统电热板加热消解法。测定结果表明，这种方法的精密度和准确度均取得了满意的效果，变异系数为1．93％～3．82％，加标回收率为95％～105％。     

基因预测中外显子分值的转化

多数基因预测算法都会给出预测外显子的分值,但这些分值大多没有意义,很难给使用者带来有用的信息.作者以基因预测程序Fgenes为例,分别用4种方法将外显子的分值转换成概率分值,通过计算机模拟,4种方法都取得了良好的效果,其中以局部多项式估计效果最好.