用八叉树数据结构自动生成三维网络的算法设计

针对计算冶金学中几何空间离散－网格生成的问题，利用数据结构技术，建立了三维网格自动生成所需八叉树数据结构，设计了八叉树遍历及子结点编码算法，应用该算法开发了三维网格自动生成软件，该软件与数值计算对象输入软件相联接，能够将数值计算对象离散成由直六面体组成的网格系统，该算法保留了修正八叉树算法的优点同时由于采用直接八叉树数据结构算法更加简便。     

P2P网络聚集计算估算方法

为了解决P2P网络计算聚集查询问题 ,引入了 3种算法 ,并给出了算法形式化描述 ,为实现P2P网络聚集查询提供了方法 .这三种算法都是基于图的连通性 ,采用生成树和信息广播等方法以适应于P2P网络应用环境 ,基本上能够保证聚集计算的有效性、准确性     

CAD/CAM与网格生成以及CFD软件的集成方法

首先对目前主流的CAD／CAM软件、网格生成软件和CFD软件进行了简单的介绍，讨论了3种类型软件集成的重要性，并提出了集成的具体方法．以某飞机的流场计算为例，阐述了CAD／CAM建模、网格生成和CFD计算的步骤和方法．结果说明，以上各种软件的集成可以极大地提高工作效率，促进CFD软件的工程实用性和工业化．     

对KIVA程序中网格生成方法的改进研究

针对 KIVA程序中网格生成方法的若干问题 ,提出了改进算法 .改进算法解决了缸盖带凹坑的ω型直喷式燃烧室的缸内网格生成问题 ,同时保留了 KIVA方法的成功因素 .结果表明 ,改进算法不仅扩大了网格生成的适用范围 ,而且能方便可靠地调节网格疏密程度 .     

燃烧室冷态流动的数值模拟

采用曲线坐标,对一个典型的燃气轮机燃烧室的冷态流动进行了数值计算,得到的结果定性合理．同时,提出了一种新颖而又简单的网格生成方法,使用该方法得到的计算网格的质量明显优于常规方法     

二维及三维网格生成中疏密和正交性的控制技术

本文通过给定边界外第一条网格线与边界之间的距离及网格与边界的夹角,联立求解椭圆方程和边界处的源项方程,获得曲线、曲面、三维空间的贴体网格,并对以前网格生成中稳定性不佳的问题做了改进。生成的网格边界间距可调,正交性好,用于压气机和透平叶片的网格生成,结果令人满意。     

偏微分方程网格生成技术中非线性系数的研究

网格生成技术是ＣＦＤ中极为关键的问题之一,偏微分方程数值网格生成技术是目前应用和研究最多的网格生成方法。本文应该各非线性系数对网格正交性和空间分布的影响进行了理论研究和数值验证。结果表明系数β具有控制网格正交性的作用,系数α和γ具有调节网格空间分布的作用,且其调节作用的强弱和α／γ的值有直接关系。     

改进TM法控制贴体网格节点分布的研究

在分析微分方程法控制网格节点分布方法的基础上，对改进的ＴＭ法控制网格生成进行研究，并以柴油机ＭＰＣ排气管分支为例，用改进的ＴＭ法生成二维贴体网格，应用实例表明，增加角度控制参数后，该方法能对复杂区域生成合理的贴体网格。     

生成无向图全部树的一种新算法

本文提出一种生成无向图G全部树的算法。它应用图的邻接下三角矩阵L$为图的数据结构,通过L$矩阵的一系列变换而完成。算法的时间复杂度为o(K(n-1)),空间复杂度是O((n-1)~2),式中n和K分别表示G的结点数和计算林树梢个数。此外文章还报道了一个图论性质的猜测,文章最后讨论了选择结点序列加速算法过程的方法。     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~