滑移线解与最小上界解一致的证明

以矢量分析方法建立了平冲头压入半无限体连续速度场并证明其散度为零，由上界定理经参量积分，广义积分求得冲头单位压力通解后，以待定参数法求得通解最小上界值，证明了该值与Ｐｒａｎｄｔｌ按滑移线方法得到的解相一致。     

树的谱半径

证明了一个使树的谱半径严格递增的变形（换）；获得了ｎ顶点树谱半径的更紧上界，这个界是顶点数为ｎ，边独立数为ｑ的树谱半径的上确界。     

树的谱半径

证明了一个使树的谱半径严格递增的变形（换）；获得了ｎ顶点树谱半径的更紧上界，这个界是顶点数为ｎ、边独立数为ｑ的树谱半径的上确界     

半固态触变力的上限解

采用上界理论解法,求解半固态A356铝合金触变成形力·假定变形体为质点连续分布的刚塑性材料,设定连续函数速度场,将变形区分为圆盘和圆环两个塑性区、一个圆环刚性区等三个区,计算结果表明,触变成形力为82298kN,与实测结果在误差允许范围内拟合良好;变形力与变形区的尺寸有很大关系,当侧壁及下部圆盘愈厚时,变形力愈小;反之,变形力愈大     

有关非负矩阵谱半径及分离度界的估计

给出了非负矩阵谱半径上下界的一个估计，并将我们的结果与以往的结论做比较；在推论部分给出了非奇异M矩阵之逆的谱半径的界的估计以及任意复矩阵谱半径的一个上界的估计．另外，我们还给出了非负矩阵分离度的上界估计．     

变厚度U型波纹壳大挠度问题的摄动解

工程上广泛应用的Ｕ型波纹壳大多具有两个特点：１）液压成型，２）环板变形远大于环壳变形。本文针对这两个特点，取环板厚度按半径的幂函数规律变化，引用小参数摄动理论，求得了变厚度环板大挠度问题的各级摄动解。然后应用圆环壳的一般解，与环板的各级摄动解相连接．得到变厚度Ｕ型壳大挠度问题的非线性解；算例与已有的实验相吻合，它表明，考虑变厚度和几何非线性因素很有必要。     

有限平面点集的两个最大距离

Ｓ是欧氏平面Ｒ＾２的一个有限界，ｎ１，ｎ２分别为Ｓ中两点间最大距离和次最大距离出现的频数，Ｈｏｐｆ＆Ｐａｎｎｗｉｔｚ和Ｋ．Ｖｅｓｚｔｅｒｇｏｍｂｉ分别在（１）和（２）中给出了它们的最大值ｎ和３／２ｎ。它们发现在同一集合中两个最大值不可能同时满足。本文给出了两个最大距离出现频数之和的一个上界，并且证明上界是最优的。     

平冲头压入半无限体摩擦影响定量分析

以矢量分析法建立了平冲头压入半无限体速度矢量场并证明其散度为零·由上界定理与待定参数法经参量积分与广义积分得到了不同摩擦条件下冲头压力p的通解·证明了m=0时,通解的最小上界值与Hill滑移线解一致·给出了不同摩擦条件p的最小上界值表达式及m与θ的关系式·结果通过m对p影响的定量分析得到冲头压力与摩擦系数有关的不同结论·     

辗扩参数对大型厚壁筒形件变形规律的影响

采用数值模拟的方法,建立了大型厚壁筒形件辗扩工艺模型,分析了辊系尺寸、筒形件尺寸和芯辊进给速度对712 mm/308 mm×902 mm筒件辗扩接触弧长和变形区应变分布规律的影响。结果表明,驱动辊半径为500 mm,芯辊半径为130 mm,筒形件内半径为164 mm(壁厚192 mm)时,筒件局部加载时的内外接触弧长之比最小,变形区应变分布的对称性好,变形穿透壁厚所需的压下量最小。驱动辊和芯辊半径分别为500 mm和130 mm条件下,芯辊进给速度为1.5 mm/s时,整个连续辗扩过程中筒件发生壁厚方向均匀的整体变形。辗扩结束后,筒形件中部大部分区域的应变平均值达到1.69.     

两类图的谱半径

得到了有k个圈且边独立数为k的一类连通图的谱半径的上界，且给出了达到上界的所有极图，同时给出了给定阶和边独立数的树的谱半径结论的一个新的证明。所得结论对进一步研究给定阶、边独立数和圈数的一般图的谱半径有重要的作用。     

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-