有约束的生长曲线模型中协差阵的最小二乘估计

利用投影理论及矩阵的谱分解方法，给出了有约束的生长曲线模型中协方差阵∑及tr（C∑）在一定条件下的最小二乘估计。     

增长曲线模型非齐次线性估计的可容许性

本文讨论了增长曲线模型中回归矩阵的函数的估计，在矩阵损失下，作者得到了非齐次线性估计在非齐次线性估计类中可容许的充要条件。     

奇异增长曲线模型中最小二乘估计的有效性

研究了奇异增长曲线模型中均值矩阵的最小二乘估计的效率问题，给出了均值矩阵的最小二乘估计相对于最佳线性无偏估计的偏差估计，定义了均值矩阵的最小二乘估计相对于最佳线性无偏估计的相对效率，并给出了它们的上界．     

熵和对称损失函数下MINQUE和简单估计的比较(英)

在熵损失和对称损失函数下，研究了多元线性模型协方差矩阵的MINQUE估计和简单估计的比较问题，其中多元线性模型的设计矩阵和离散矩阵可以不满秩.并证明了，在熵损失函数下，MINQUE估计总是优于简单估计.     

广义生长曲线模型中均值矩阵的泛容许估计

讨论了广义生长曲线模型中均值矩阵的线性估计在二次损失矩阵函数下的泛容许性，并在某些线性估计类中得到了泛容许估计的充要条件。     

增长曲线模型中线性估计类所有可容许估计

对增长曲线模型中回归矩阵的函数的线性估计进行了研究。在矩阵损失下，作者得到了线性估计在一切线性估计类中可容许的充要条件。     

含有随机效应的增长曲线模型协差阵的最小二乘估计

利用矩阵的谱分解和投影理论,给出了增长曲线模型均值结构中存在随机效应时,随机效应和随机误差两种不同性质的随机变量的协差阵Г,∑及其线性函数tr(C∑ DГ)的最小二乘估计,并讨论了估计tr(C∑^* DГ^*)的一些优良性。     

协变量缺失的乘积模型的加权LPRE估计

针对协变量随机缺失的乘积模型，结合逆概率加权(inverse probability weight, IPW)、绝对乘积相对误差(least product relative error, LPRE)及非参数核估计方法，研究该模型中参数的估计问题。在一定的条件下，证明了提出的估计具有渐近正态性。最后，通过随机实验检验了新方法的有限样本表现。     

噪声信号极点估计的一般方法

建立了阻尼指数和信号的状态空间模型，提出了噪声中阻尼指数和信号极点估计的状态空间方法；基于输出方程和状态方程的估计算法，证明了矩阵预测方法等价于状态空间方法的算法二，从而使Ｐｒｏｎｙ方法，Ｋ－Ｔ方法，矩阵束方法以及矩阵预测方法在状态空间意义之下得到统一。     

正则化的精度矩阵估计的解轨迹

精度矩阵在高斯图模型中具有广泛的应用,许多正则化方法用于精度矩阵的估计问题,然而却很少有对其解轨迹的关注。本文主要利用条件数正则化协方差矩阵估计的方法来探索精度矩阵估计的解轨迹,数值模拟结果表明该轨迹算法可以便捷地描绘出精度矩阵估计的解轨迹。     

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     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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