二维性

Abstract］ Objective To describe the shape of the planar space of the corneal anterior surface of children with emmetropia by using a conic section, and then to plot the changes in asphericity on 36 meridians to deduce the formulae of the three-dimensional shape of the corneal anterior surface.

目的 通过二次曲线方程来描述正视儿童角膜前表面的二维空间形态，根据各子午线非球面性的变化规律推导出其三维形态的数学表达式及非球面性变化规律表达式。

Events,Operation and Relation of Sets, Classical Probability, Geometrical Probability , Statistical Stability of a Frequency, Axioms of Probability, Conditional Probability, Total Probability Theorem, Bayes' Rule,Independent Events,Independent Repeated Trials, One Dimensional Random Variables, Discrete Random Variables, Distribution Function of a Random Variables , Continuous Random Variables, Normal Distribution, Distribution of a Function of a Random Variable, Multidimensional Random Variables, Joint Distribution Function, Marginal Distribution Function,Discrete Two—Dimensional Random Variables,Continuous Two—Dimensional Random Variables, Independent Random Variables, Distribution of Functions of Random Variables,Expectation,Variance, Covariance, Coefficient of Correlation, Bivariate Normal Distribution, Law of Large Numbers, The Central Limit Theorems, Sample and Population ,Chi—Squared, T and F Distributions , Sampling Distributions , Point Estimation , Interval Estimation , Testing Hypotheses , A Test of Significance for Parameters in a Single Sample From a Normally Distributed Population , A Test of Significance for Parameters in Two Sample From Normally Distributed Populations .

本课程的主要内容：概率的概念与运算、随机变量及其分布、随机变量的数字特征与极限定理、数理统计的基本概念、估计和检验的基本方法，随机事件与概率随机事件、事件的关系与运算、几何概率、统计概率等，条件概率、全概率公式、贝叶斯公式、事件的独立性、二项概率公式，随机变量的概念、离散型随机变量、随机变量的分布函数、连续型随机变量、随机变量函数的分布，多维随机变量及其分布函数、边缘分布函数、随机变量的独立性、二维随机变量函数的分布，数学期望、方差、协方差和相关系数、大数定律、中心极限定理，总体与样本， X 2-分布、 t-分布和 F-分布，统计量及抽样分布，假设检验的基本概念、单个正态总体参数的显著性检验、两个正态总体参数的显著性检验。

Two application experiments have been run, one is the alignment of two Cartesian coordinate system and the other is the 2-D position detection to a planar moving object.

完成的两坐标系对准实验和二维运动物体位置测量实验结果说明了利用角度格栅测量二维位置的有效性和简捷性。

A 2D harmonic model based on the quaternion was constructed,and a special four-order cumulant was defined.

构造了合适的基于四元数的二维谐波模型，根据此模型定义了特殊的四阶累积量切片，分析了加性高斯在有色噪声中的二维三次非线性相位耦合。

The necessity and reality of designing of a personal matters management system are expounded at the first. And then, the design of such a system in Chinese dBASE Ⅱ and a function module suitable for input recording, command file updating, querying, statistic analysing, browsing and printing,...

首先阐明中文dBASEⅡ人事档案管理系统的必要性和现实性，然后阐明中文dBASEⅡ人事档案管理系统的设计思想，系统功能模块(包括记录输入模块，更新命令文件，查询功能，统计、浏览、打印功能，报表打印功能)的实现，最后，指出系统所具有的六个特点，即系统的通用性，建库的选择性，更新资料的保密性与多样性，查询的各种组合性，报表格式的灵活性以及统计打印的二维性等。

Complex V shows a one-dimensional 'Z' chain which are linked into two-dimensional lamellar structures by weak π-π stackings. Complex VI shows one-dimensional chiral helical chains which are linked into molecular zipper. Both complexes show strong blue photoluminescent under R.T. Complexes VII and VIII are monometallic complexes of Fe.

由对苯二甲酸形成的化合物Ⅴ是由一维的'Z'型链组成的，链链之间通过π-π弱相互作用形成了二维结构；而由间苯二甲酸形成的化合物Ⅵ是由一维的手性螺旋链组成的，链链之间通过π-π相互作用形成拉链状的二维结构，Ⅴ和Ⅵ在室温下具有强荧光。

In light of the convergence theorem obtained in Chapter 2, a result on topology preservation of 2-dimensional SOM algorithm with continuous inputs is given. In Chapter 4, an equivalence relation on n dimensional Euclidean space, called equi-action relation, is introduced and a number of properties on this relation are studied.

指出了已有的有关SOM算法拓扑保序定义的缺陷，并在此基础上，给出了一个具有连续输入的二维SOM算法的拓扑保序新定义；利用第二章中的收敛性定理，我们进而获得了一个具有连续输入的二维SOM算法的拓扑保序性定理。

During building 2D model, I use the concepts of point, segment, line and plane, the segment can be formed from points, then line can be formed from segments, the closed curved plane can be obtained by around lines, and finally the 2D model can be built by closed curved plane; I express the un-smooth stratum or fault by linear fitting and express the smooth stratum or default by cubic spline fitting segmentally, in this way I can describe the variation feature of 2D interface properly.

在二维建模中，引用点、段、线、面的概念，即由点形成段，由段形成线，由线围成封闭面，封闭面构建成二维模型；对表示二维地层和断层的界面线，用线性拟合表示非光滑性地层或断层面，用分段三次样条拟合表示光滑性地层或断层面，恰当地表达了二维界面的变化特点。

The book said:"gossip Yang Yao '-' and Yin Yao '--' 3 overlap in the form of something to 'number of days''days of the system' has the meaning" and cited "days Sanko, Sun Moon Star"( Ban Gu,"Bai Hu Tong · Feng Gong Hou") certificates. This argument is also wrong: the ancient's "days" refers to an astronomical count one and not confined to Sun Moon Star Sanko.

在《易经》和阴阳八卦学理中，&阴阳两仪&指的是天、地或阴阳二性、阴阳二气均不是&线&，&四象&指四时、四方或老阴、老阳、少阴、少阳四种属性，&八卦&指八种基本物质天、地、水、火、雷、风、山、泽，&六十四卦&及其三百八十四爻可以象征和指代万事万物，均处于四维时空中，而并无一维、二维、三维、六维之别。

A series of concepts of conforming Voronoi diagram is proposed and a robust algorithm—"the control circle/sphere algorithm"capable of controlling the scale and quality of Voronoi grid is designed and realized.

本文针对石油地质领域的已有PEBI网格（一种限定Voronoi图）生成算法中存在的问题和局限性，对限定Voronoi图的网格剖分技术进行了系统的研究，提出了限定Voronoi图的一系列概念和理论，设计了具有较好健壮性的平面限定的二维／三维限定Voronoi图生成算法，并实现了二维限定Voronoi网格的尺度控制和质量控制。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。