变系数模型的减小方差估计

提出了一种变系数模型的减小方差估计。在任意估计点,利用其附近3个点的局部线性估计的线性组合得到减小方差估计。所得估计与局部线性估计有相同的渐近条件偏差,但较局部线性估计有更小的渐近条件方差,而且该估计具有局部线性估计的良好性质,局部线性估计所采用的窗宽选取方法均可直接应用于该估计。通过数值模拟计算,表明所提出的方法在有限样本下也可以有效地降低估计方差。     

生长曲线模型的综合岭估计

该文提出了生长曲线模型回归系数的一种新的有偏估计—综合岭估计,讨论了综合岭估计的优良性、可容许性等性质,给出了其迭代解和极小化均方差的无偏估计解。在综合岭估计下,岭估计、广义岭估计、根方估计成为其特例,从而统一了生长曲线模型的岭估计和根方估计理论。     

聚集数据线性模型参数聚集Liu估计的相对效率

 当线性模型中的变量间存在复共线性时,常用有偏估计代替无偏估计。其中广义岭估计是研究较多的一种有偏估计。很多实际问题只能观测到聚集数据。本文给出了聚集数据线性模型聚集Liu估计的定义,提出了聚集Liu估计相对于最小二乘估计的两种相对效率,并得到这两种相对效率的上界;给出了聚集Liu估计相对于Peter-Karsten估计的2种相对效率及其上界。本文提出的聚集Liu估计,既能保证估计参数的稳定性,又能保证估计参数的近似无偏性,从这个意义上说,该估计在某种程度上优于聚集广义岭估计。     

基于指数模型的R=P(Y<X<Z)统计推断（英文）

文章讨论了接收器工作特性曲线(ROC)指标R=P(Y X Z)的统计推断问题,分别给出了R的不同点估计和区间估计,其中点估计包括最大似然估计和贝叶斯估计,区间估计包括正态近似区间估计、精确区间估计以及贝叶斯可信度置信区间估计。通过数值模拟,比较了上述估计方法的优劣,并且给出了选择不同估计方法的建议,数值模拟结果表明上述估计方法是可行的。     

基于外延原理的混合动态系统估计器设计

以混合动态系统的外延原理为工具分析了估计器的可压缩性问题．给出了外延系统的估计器可以压缩成原系统估计器的充分条件．证明了满足外延原理的外延系统的任意估计器均可压缩成原系统的估计器，因此，原系统的估计器可由外延系统的估计器压缩而成，并且外延系统能取得好估计的估计器压缩后是原系统的能取得好估计的估计器。     

回归系数的一种有偏估计

为了改进最小二乘估计，克服其在设计阵呈病态时表现出的不可靠性，本文将最小二乘估计、Stein型估计和组合主成分估计的方法联合起来，提出了多元线性模型回归系数的一种新的有偏估计。并且证明了：此种估计在均方误差意义下是可容许估计；在参数区域的某个椭球内，这种新的估计优于最小二乘估计、主成分估计和组合主成分估计。     

混合系数线性模型参数的一类有偏估计

在连续测量数据的情况下,针对模型的复共线性,本文给出了混合系数线性模型参数的一类有偏估计,称之为s-K-B估计。在一定条件下证明了这类估计分别优于岭估计,Stein估计,s-K估计以及最小二乘估计。     

线性回归模型中的KL型主成分估计

当线性回归模型中存在复共线性时,基于最小二乘估计的统计推断往往会受到影响。鉴于此,结合主成分估计和KL估计,提出了一类新的估计方法,即KL型主成分估计,以期克服复共线性问题。同时,得到新的估计在均方误差意义下优于最小二乘估计、主成分估计、r-k估计、r-d估计和KL估计的充要条件。并利用Monte Carlo模拟和实证分析对各估计量在均方误差准则下进行了比较。     

混合系数线性模型参数的一类有偏估计

在连续测量数据的情况下,针对模型的复共线性,本文给出了混合系数线性模型参数的一类有偏估计,称之为s-K-B估计。在一定条件下证明了这类估计分别优于岭估计,Stein估计,s-K估计以及最小二乘估计。     

多传感器信息融合方法与仿真

给出了一种多传感器多维位置数据融合的方法。这种方法基于多维位置数据的鲁棒估计和最小方差结合法。每个传感器用鲁棒估计得到自身数据的位置估计和方差估计,把这些估计融合为一个最优估计,即传感器系统的估计。     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with