序贯抽样决策中的抽样数量

序贯抽样决策的核心问题是抽样数量的多少及其样本单元所反映的动态信息特征，笔提出了“基本抽样数（nmin)”概念，并分别就不同的序贯抽样决策模型给出了相应的计算公式。在林间抽样决策中，预定的抽样数(n）应大于或等于nmin（即n≥nmin），以避免序贯抽样曲线方程对判断结果影响，结合最大抽样数nmax，两确定了序贯抽样曲线方程的适应范围。     

保护地西葫芦灰霉病病株空间分布格局及其抽样技术

研究了保护地西葫芦灰霉病病株空间分格局及其抽样技术。通过聚集度指数的测定以及m’-m回归和Taylor幂法则分析,结果表明,保护地西葫芦灰霉病病株为聚集分布,病株空间分布的基本成分是个体群,病株个体间相互吸引,病株分布存在着明显的发病中心,应用种群聚集均数（A）检验了聚集的原因。根据1wao抽样公式,获得了在各种密度下的最适抽样数,建立了序贯抽样模型为d-/1=n±2.1131√n。     

计数型序贯网图检验

针对序贯概率比检验(SPRT)无法控制抽取样本量等不足之处,提出了一种改进的抽样检验方法-----序贯网图检验. 该方法的要点是在原SPRT问题中插入一系列检验点,将单个检验问题拆分为若干对假设检验的问题. 计算表明,新方法比SPRT有明显的改进; 与国际公认的抽样标准IEC 1123所建议的截尾序贯概率比检验方法比较,其改进是全方位的.     

广义线性模型中带有测量误差的序贯压缩估计（英文）

对带测量误差的广义线性模型提出一种序贯压缩估计方法来确定最小样本量,使得在此最小样本量下所提方法可以选择有效变量,同时还可以获得给定精度下的回归参数估计.也研究了所提方法的渐进性质,包括序贯置信域的覆盖概率、最小样本量的效率等.模拟研究表明基于序贯压缩估计的抽样方法比传统的序贯抽样方法能够节省大量的样本.最后,用所提方法来分析一个糖尿病数据集.     

c‘—m回归模型在确定昆虫种群空间分布型中的应用

根据随机型概率分布（Ｐｏｉｓｓｏｎ分布）中，方差（ｖ）与均值（ｍ）相等的性质，提出一个新的种群聚集度指标Ｃ’，Ｃ’＝ｍ／ｖ＋ｍ。Ｃ’指标不仅可用来判断昆虫种群的空间分布型，而且ｃ’与ｍ之间存在着线性关系，据此，提出了ｃ’－ｍ回归模型：Ｃ’＝ａ＋ｂｍ当ｃ与ｍ线性相关显著时，ａ、ｂ的不同组合型式就揭示了种群不同的空间分布型的信息，根据ｃ－ｍ模型，推导了序贯拉机方程和最大抽样数量的确定公式。     

基于瑞利分布的计量型序贯网图检验

针对瞄准发射系统中着落点位置通常服从瑞利分布的事实,研究了计量型检验问题,建立了基于瑞利分布的序贯网图检验.采用搜索和迭代的计算机程序,可以得到计量型序贯网图检验方案.通过实例将序贯网图与计量型定数检验和计量型序贯概率比检验进行比较.结果显示,计量型序贯网图检验在减小最大样本量方面有更好的效果,更适用于高成本的抽样检验.     

麦红吸浆虫土壤虫态的空间分布型及其抽样技术的研究

小麦红吸浆虫的幼虫和圆茧在土壤中均呈聚集分布，前者随虫口密度的增高其聚集强度增强，后者则随虫口密度的增高趋于均匀。应用ＩｗａｏＭ＊－Ｍ回归法求得理论抽样数模型，从而导出在一定置信概率七、允许误差Ｄ和不同虫口密度下的理论抽样数Ｎ。采用Ｉｗａｏ提出的序贯抽样法得到幼虫的序贯抽样型。     

可可广翅蜡蝉成虫空间分布型及抽样技术研究

该文采用了6种聚集度指标,2种回归模型对可可广翅蜡蝉成虫在茶园的空间分布型进行了探讨,结果表明均属聚集分布,聚集原因是由其本身的聚集行为与环境因子综合影响的结果.同时探讨了Iwao理论抽样模型及Willson序贯抽样技术,从而确定了在不同虫口密度下的理论抽样数及不同抽样点数下的累积虫口量.     

概率比检验中的时间序贯方法

在概率比检验中加入时间序贯的考虑,对指数模型有随机进入时间及有截断数据的情形提出了时间序贯检验的方法,并对概率比 有无时间序贯考虑的两种情况下的检验结果进行民比较,给出了计算机模拟结果。     

c''''一m回归模型在确定昆虫种群空间分布型中的应用

根据随机型概率分布（Ｐｏｉｓｓｏｎ分布）中，方差（ｖ）与均值（ｍ）相等的性质，提出一个新的种群聚集度指标，，＝ｍ／ｎ＋ｍ。指标不仅可用来判断昆虫种群的空间分布型，而且ｃ’与ｍ之间存在着线性关系。据此，提出了“ｃ－ｍ回归模型：ｃ＝ａ＋ｂｍ。当ｃ’与ｍ线性相关显著时，ａ、ｂ的不同组合型式就揭示了种群不同的空间分布型的信息。根据ｃ－ｍ模型，推导了序贯抽样方程和最大抽样数量的确定公式。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the