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algebraic structure相关的网络例句

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The graphic structure analysis for algebraic relationship of rough sets is a new research direction of the rough set theory.

粗糙集代数关系的图结构分析是粗糙集理论中又一研究方向。

The total molecular optical rotatory power depends on the algebraic sum of rotations of all helices existed in the molecular structure .

化合物的总旋光方向是由分子结构中所有螺旋旋光度的代数和所决定。

According to the helix theory , the algebraic sum value of all rotations of dihedral angle helix is equal to zero in the structure of 1,3-disubstituted cyclohexane derivatives.

按照螺旋理论,1,3-二取代环已烷衍生物的结构中存在的二面角螺旋旋光度代数和为零,不应具有旋光性,但是它们却是光学活性的。

In the fourth chapter, firstly it introduces the Boolean functions algebraic expressions of the 2-value clock-controlled stop-and-go generator and Gunther generator. It reveals the balanced property of the two kinds of Boolean functions, and studies the Walsh cycle spectrum and the autocorrelation function. It also obtains the coincidence rate of their output sequences with affine sum of some bits of input sequences, and analyzes their ability of resisting the best affine approximation cryptanalysis and differential cryptanalysis. Secondly, we properly present a new definition of the Best Affine Approximation, namely BAA on the Boolean vector functions, followed by the spectral characteristic of such defined BAA attacks through using the decomposition formula of the union distribution for random variables. A lower bound of such BAA attacks is proposed. Finally, we also study the spectral characteristic of the second kind of nonlinearity of Boolean vector functions, followed by a higher bound of such nonlinearity. Furthermore, the limited relationship between the second kind of nonlinearity of Boolean vector functions and the linear structure of the linear combination of every component is analyzed.

在第四章中,首先给出了2值密钥流"停走生成器"和"衮特生成器"中实际存在的布尔函数的代数表示,揭示了这两类布尔函数的平衡性,随后研究了它们的Walsh循环谱和自相关函数等,得到了它们的输出序列与输入序列中的某些bit的仿射项的符合率,分析了它们抵抗最佳仿射逼近攻击和差分攻击的能力;其次,我们合理地给出了布尔向量函数最佳仿射逼近的新定义,利用布尔随机变量联合分布的分解式考察了相应的谱特征,并给出了布尔向量函数与其最佳仿射逼近的符合率的一个下界;最后,我们还考察了布尔向量函数第二类非线性度的谱特征,给出了布尔向量函数第二类非线性度的一个上界,并揭示了布尔向量函数第二类非线性度与其各个分量的线性和的线性结构之间存在的制约关系。

Based on the Saint-venant equations describing the channel flow movement, the nonlinear algebraic equations derived by the use of Preissmann weighted implicit four-point scheme are solved with the Netwon-Raphson method. A combined Gauss main-element elimination method with compress-storage technique is proposed. The relaxation iterative method for solving branch river networks is extended, which can turn the problem of any complex river networks into the problem of a series of single rivers. The coupling of hydraulic model with water quality model is built up. The combined model was applied to a large complicated river networks with numerical hydraulic structure which influenced by strong tide, storm and heave rain. Visualization of computational results is realized by means of MapInfo, which displays the computational results in fast, convenient and accurate way.

水力模型以描述河道洪水波运动的Saint-Venant方程组为基础,用Newton-Raphson方法直接求解按Preissmann加权四点格式进行离散所得的非线性代数方程组,提出了压缩存贮形式的Gauss列主元消去法并对数值解的收敛性进行了讨论;将支流流量的松弛迭代方法从树状河系推广到了环状河网,使任意复杂河网水力计算的问题都可化为一系列的单一河道的水力计算问题;建立了水力模型与水质模型的联接,初步应用于既有洪水、暴雨、强潮等综合影响,又存在多种水工建筑物及水力调度问题的大型复杂河网中的非恒定流水力、水质计算问题;利用MapInfo对计算结果的可视化进行了研究,有利于决策者快速、方便、准确地作出决策。

This paper discusses the kernel of the system -- geometric model and includes the following:(1) The topological elements and the relation between them in geometric modeling system are explained and expressed by the theory of simplicial complex and CW-complex. In addition, the identification operators and homology theory in algebraic topology are used in our model. A hierarchical structure is built on the base of complex.

本文主要讨论这个系统的核心问题——几何建模问题,包括以下几个方面内容:(1)用单纯复形和CW复形的理论来解释和表达造型系统中的拓扑元素和拓扑元素之间的相关关系,并将代数拓扑中的粘合操作和同调论应用到模型中,建立以复形为基础的层次结构。

The material job and main conclusion are as follows:(1) A simple boundary orthogonalization procedure independence grids generation method is put forward on the base of algebraic grid generation method; Data structure and computational model on interface are established aiming at blocks of structured grids.

本文针对粘流场数值模拟技术的研究现状和发展动态作了比较全面的回顾与展望,重点研究了网格生成技术、数值求解技术、湍流模型技术和动边界模拟技术,在此基础上建立了模拟自由面湍流场的数学模型,并成功地应用到二维溢流坝和带闸墩的三维溢流坝过坝水流的数值计算。

The material job and main conclusion are as follows:(1)A simple boundary orthogonalization procedure independence grids generation method is put forward on the base of algebraic grid generation method; Data structure and computational model on interface are established aiming at blocks of structured grids.(2) SIMPLE procedure is established in nonorthogonal grids by use of the finite volume method and in-depth discusses on special topic such as boundary condition in nonorthogonal grids, deferred correction method and grads compute on calculational nodes, and so on.

本文完成的具体工作和主要结论如下: 1以代数网格生成方法为基础提出了一种简单的、可独立于网格生成方法之外的边界正交化技术;针对分区结构网格系统建立了分区交界面处的数据结构与计算模型; 2利用有限体积方法在非正交同位网格系统中建立了SIMPLE求解算法,对非正交网格系统中的边界条件、延迟修正技术及计算节点的梯度计算等专题进行了深入讨论。

On the basic of above job a mathematical model of simulation turbulent flow with free surface is established and triumphantly applied to numerical computation on 2D spillway and 3D spillway with frusta of brake.The material job and main conclusion are as follows:(1)A simple boundary orthogonalization procedure independence grids generation method is put forward on the base of algebraic grid generation method; Data structure and computational model on interface are established aiming at blocks of structured grids.

本文针对粘流场数值模拟技术的研究现状和发展动态作了比较全面的回顾与展望,重点研究了网格生成技术、数值求解技术、湍流模型技术和动边界模拟技术,在此基础上建立了模拟自由面湍流场的数学模型,并成功地应用到二维溢流坝和带闸墩的三维溢流坝过坝水流的数值计算。

Within algebraic geometry is the description of geometric objects as solution sets of polynomial equations, combining the concepts of quantity and space, and also the study of topological groups , which combine structure and space.

在代数几何里,把几何对象描述成多项式方程的解集,结合数量和空间的概念;也研究拓扑群,结合了结构和空间。

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