基于改进BP算法的广义逆矩阵求解方法

研究了广义逆矩阵的人工神经网络求解．基于改进的BP算法，提出了求解广义逆的3层网络的拓扑结构，包括各层神经元的个数、排列方式，提出了各层之间连接权值的分布规则等．推导出了求解15类广义逆所必需的4个计算公式．程序模拟证明，这种方法可以求出包括方阵、长方阵和病态短阵在内的所有类型短阵的广义逆矩阵．     

求解有限元方程的区域分裂迭代算法

研究椭圆边值问题有限元离散方程的形成与求解．在区域分裂的基础上，构造出一类具有并行计算结构的迭代算法，并分析了算法的收敛速度     

线性互补方程解法在减震结构体系中的应用

将变分不等方程-线性互补方程解法应用于减震结构体系(空间框架、框剪结构)设置减震器的分析与计算．确定了减震器的计算模型，推导出减震结构体系的变分不等方程-线性互补方程，利用Lemke算法求解并编制了相应的程序．计算结果表明，本文的方法、理论及程序是正确的．     

随机激励下高压管道的疲劳寿命分析

应用功率谱密度(Power Spectral Density)法对随机基础激励下高压管道进行疲劳寿命分析．给出了在随机激励作用下结构的随机响应计算方法，由随机过程和Miner线性累积损伤理论，推导了功率谱密度法估算结构寿命的公式．在此基础之上，以一飞机高压管道结构为例，编写程序求解出其疲劳寿命值．算例表明，在某些结构的应力响应无法实测或难以实测到的情况下，采用功率谱密度法分析其疲劳寿命显得简洁有效．     

相邻结构之间的碰撞分析

针对土木工程中相邻结构的碰撞问题，提出了一个新的分析模型，即建立碰撞附加速度约束条件，然后求解冲量形式的动力方程．碰撞力以约束力冲量的方式出现在动力方程当中，无需预先求解，并给出了求解结束之后直接通过单元处理求得撞击力的方法．算例分析表明，该模型在分析结构之间的碰撞时是有效的．     

改进的基于拓扑分析的Steiner树近似算法

针对Berman近似算法k为3情况下的求解思想进行了改进。在使用Fibonacci堆求解出相应点对间最短距离的基础上，通过构建Voronoi域求出元组子树的耗费，并分析了Steiner树的网络拓扑结构以去除无用元组，从而简化拓扑，降低总体时间复杂度。在实验结果中，每个实例的过滤因子均大于0．9，有的甚至高达0．999，这表明大量无用的元组在进入评估阶段和构造阶段之前已被过滤掉，同时运行时间的减少也显示出改进算法在多播应用的路由寻径中更有效。     

高层结构剪力墙最优刚度的数学模型法

通过用数学模型法求解高层结构剪力墙的最优刚度，阐明唯物辩证法在建立求解高层结构剪力墙最优刚度数学模型过程中的运用，在工程设计中具有明显的经济效益．     

基于松耦合法的求解气动弹性问题的数值模拟方法

通过修改流体-结构界面处流体域的边界条件并引入松耦合方法，改进了一种求解气动弹性问题的数值计算方法．该数值计算方法的网格生成、流场求解、结构求解和数据交换四个过程相互独立，因而有可能利用现有的发展比较成熟的商用网格生成器、CFD（computational fluid dyllamics）求解器和CSD（computational structural dymrmcs）求解器分别完成这些功能．通过对折减阻尼比为0．0208的圆柱涡激振动问题在雷诺数为100条件下的计算结果进行分析，表明该方法是可行的．     

网络并行计算在轨道结构动力分析中的应用

针对车辆-轨道结构动力分析问题，提出了一种基于网络并行计算环境的并行求解方法．考虑车辆和轨道结构特征，建立车辆-轨道结构动力分析模型，推求动力响应微分方程．针对推导的微分方程，改进串行求解算法，提出一种宏流水并行算法．针对算法的性质分析了该算法的适用范围，并从理论上分析了最佳节点机个数和最大加速比．考虑车辆通过轨道不平顺情况，实现了求解轨道结构动力响应的宏流水并行程序．分别在工作站和个人计算机组成的网络并行环境中，测试了提出的宏流水算法性能．实验结果表明，宏流水并行算法可以获得良好的加速比．     

利用重分析方法求解结构优化中的位移灵敏度

提出了一种求解位移灵敏度的新方法．基于组合逼近，得到位移的一阶和二阶灵敏度．求解过程是基于初始设计的单点精确分析结果，适合于多种类型的设计变量和结构修改．     

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.     

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