柯西不等式的一个注记

利用向量的勾股定理证明了线性代数中的柯西不等式和三角不等式,探讨了这两个不等式的联系,并用三角不等式证明了柯西不等式,指出了该不等式名称中一个易被忽视的细节.     

正定厄米特矩阵的几个不等式

推广张远达在线性代数原理中给出的一个不等式．并得到两个不等式．一个是关于一组n阶正定厄米特矩阵的不等式,另一个是关于一组两两可变换的,n阶正定厄米特矩阵的不等式。     

浅谈构造几何体证明不等式

不等式的证明方法很多，课本中介绍了几种基本证法。但对于许多构造新颖、风格各异的不等式，常规证法往往难以奏效，或是证明过程十分繁琐。有必要开拓思路，另辟蹊径。证明不等式，构想一个辅助问题是一个有效的好主意。所谓“辅助问题”，实质上就是应用构造思想，构造新数学模型而成的“辅助问题”。这种构造数学模型的方法不仅是一种数学解题方法，而且也是解决科学技术问题最常用、最重要的方法，所谓用构造法证明不等式，即是在证明时先构造一个与问题A有关的辅助问题B-即新的数学模型，其构造方法完全取决于A的特征，而且我们可以…     

解线性不等式组的一个简便方法

本文应用线性代数的有关理论,提出了一个解线性不等式组的简便方法,并给出了一个判断不等式系统无解的充要条件。数值例子显示出所述方法的有效性。     

线性代数方程组列处理法分治策略

利用列处理法和分治策略给出一种求解任意线性代数方程组AX=b(A∈R^nxm)的迭代分治算法，证明算法对任意的相容性线性代数方程组收敛于它的一个解而对任意的不相容性线性代数方程组收敛于它的一个最小二乘解，并探讨算法的加速技术及其在线性代数方程组MIMD并行迭代算法研究中的应用前景。     

Lagrange乘数法在证不等式中的应用

通过构造最值问题，用Ｌａｇｒａｎｇｅ乘数法，给出了几个最重要的不等式的证明，从而展示了Ｌａｇｒａｎｇｅ乘数法与不等式的关系。     

拉格朗日中值定理证明方法的研究与探索

拉格朗日中值定理是高等数学中一个重要的知识点,是理工科学生考取研究生必考的内容,本文从几何意义、微分方程构造法、行列式构造法等四个角度证明拉格朗日中值定理,将高等数学、线性代数、微分方程知识结合起来,拓展学生思维,为进一步学习奠定基础.     

关于秩不等式的注记

在线性代数与矩阵论的教材中,经常提到某些著名秩不等式。但使秩不等式成为等式的条件一般是不加考虑的。本文对某些著名秩不等式给出了那样的条件。     

Polya－Szego的一个不等式的推广

首先利用不等式的求和构造法证明几个引理，然后利用同样的方法将Ｐｏｌｙａ－Ｓｚｅｇｏ不等式从几个方面加以推广．     

线性代数方程组的单纯形解法

本文提出求解线性代数方程组的单纯形方法,即将所给线性代数方程组转化成为一个非负右端项和非负变量的特殊方程组,进而构造一个规范形式的标准线性规划问题,然后采用单纯形方法求解这个线性规划问题。如果这个线性规划问题的目标函数的最优值为零,则可求出这个线性代数方程组的基础解系,如果这个线性规则问题的目标函数的最优值不是零,则这个线性代数方程组无解。     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-