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。     

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．     

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。     

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。     

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。     

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。     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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-