钢筋混凝土剪力墙结构几何和材料双重非线性静力分析…

本文进一步发展了不需存贮结构刚度注解非线性方程组的伪动力有凶法以应用于钢筋混凝土剪力墙结构的非线性静力分析，文中对钢筋混凝土材料采用Ｖｅｃｃｈｉｏ和Ｃｏｌｌｉｎｓ非线性弹性兵平旋转裂缝模型，几何非线性采用Ｇｒｅｅｎ应变公式计算，用平面应力在角形单元离散力墙结构，时间积分采用显示中心差分格式，数值计算表明，本文有效可靠。     

C4H6O分子的强电场效应的ab initio理论研究

利用Ｇａｕｓｓｉａｎ９２程序，计算和讨论了在强电场下，Ｃ４Ｈ６Ｏ分子的几何构型及其电子结构的变化。计算和分析结果表明在强电场下，分子的几何构型的变化很小，然而其电子结构的变化较大。并与实验结果一致，为电化学的微观理论观察提供了有力的证据。     

钢筋混凝土结构的有限单元法：非线性分析

文中在完成了用虚拟层合单元对钢筋混凝土弹性分析的基础上，引入Ｂａｔｈｅ的混凝土的非线性本构关系及Ｐｒｏｄｇｏｓｋｉ破坏准则，进行钢筋混凝土结构的材料非线性三维有限元分析，对Ｂｒｅｓｌｅｒ－Ｓｃｏｒｄｅｌｉｓ梁的分析结果表明文中所采用的方法具有一定的精度和效率。     

结构机动分析的机动矩阵方法

本文阐述了机动矩阵、几何不稳定度以及有效与无效联系的概念,提出了一种结构机动分析的新方法——机动矩阵方法,给出了结构几何稳定性的充要判据。文中还讨论了机动矩阵法在求解超静定结构时静定基的选取以及对结构几何不稳定性的改造这两方面的应用。     

Trie Hashing结构平均路径长度分析

针对 Ｗ．Ｌｉｔｗｉｎ提出的 Ｔｒｉｅ Ｈａｓｈｉｎｇ结构的路径长度分析问题，研究并揭示 了该结构所具有的某些新的性质；建立了必要的分析前提．从而给出了 Ｔｒｉｅ Ｈａｓｈｉｎｇ 结构平均路径长度的分析方法。所得估计式仅与外部结点数目有关，理论分析与模拟 实验的结果表明，对于 Ｔｒｉｅ Ｈａｓｈｉｎｇ 结构，文中的分析方法明显优于 Ｋｌｅｉｎ 和 ｗｏｏｄ的类似结果。     

柔性结构非线性分析的杆单元有限元法

本文根据非线性弹性理论，采用拉格朗日坐标描述法，在三维整体坐标系下，直接根据应变的定义建立了精确应变的非线性几何关系．从而可以考虑任意次高阶位移的影响，得到了轴向应力应变的直接关系，根据虚功原理推导了杆单元非线性有限元增量方程及切线刚度矩阵，利用Ｎｅｗｔｏｎ－Ｒａｐｈｓｏｎ法进行了实例计算．结果表明本法精度很高，适合于柔性结构分析、设计时采用．     

GaAs600门门阵列及电路设计系统的研究

本文提出一种以ＧａＡｓＭＥＳＦＥＴ双层金属布线工艺和ＳＤＦＬ电路形式为基础的ＧａＡｓ６００门门阵列基片的结构，阐述了实用ＧａＡｓ单元库的设计准则和方法，并以全加器为例说明了宏单元库的电路形式，几何结构，内部布线及对输入输出的考虑，实用ＧａＡｓ门阵列设计系统已在ＣＯＭＰＡＣＡＤ工作站上建立，文中给出了一个用该系统设计的应用实例。     

高速轨道的动力分析与结构模式

根据高速列车的荷载特点，着重分析研究了高速轨道的动力响应及轮轨间的相互作用。建立了计算模型，进行了大量计算，并根据计算结果分析了轨道部件及轨道几何不平顺对轨道动力响应的影响，进而对高速轨道结构模式与几何标准提出了建议     

结构可靠度分析的优化算法

根据结构可靠指标的几何意义，建立了正态随机变量和非正态随机变量下的结构可靠度计算的优化模型，并利用已有的优化方法对其求解方法进行了研究。本文的方法无需对非线性功能函数作线性化近似处理，从而提高了结构可靠度的计算精度，扩大了其适用范围，为结构可靠度分析提供了一种新的思路。     

三维任意几何光子成像系统的散射修正及图像重建方法

在客体材料密度重建过程中考虑散射光子的影响,研究了在重建过程中通过迭代扣除散射贡献进行散射修正的重建方法.针对三维任意几何结构问题,利用AutoCAD的二次开发功能实现几何前处理,开发了用于散射量计算的快速光子输运计算程序及基于三维任意几何结构的迭代法图像重建程序(IPOR).通过与蒙特卡罗程序MCNP进行数值比较,可知文中采用的散射修正方法在达到与蒙特卡罗方法相当精度的同时,其计算效率可提高2个数量级.重建计算结果表明,IPOR的重建精度远高于未进行散射修正的直接求解法的重建精度.     

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.     

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