基本类

This paper firstly introduces the point set of topology theory, enumerating all kinds of topology relations which have practical application value.

首先介绍了点集拓扑理论，归纳了有实际应用价值的各种拓扑关系，分析了拓扑模型中的最基本拓扑元素和空间实体的关系；然后提出了一种要素类的拓扑构建方法，其算法以MAPGIS7.0空间实体的结构为依据，主要体现要素分裂的思想。

Thus, how to deal with the singularity of the matrix becomes one of the basic tasks of LDA.

因此，如何处理类内散布矩阵的奇异性成为Fisher鉴别分析的基本任务之一。

The content included (1) characterizing macropres shapes;(2) obtaining the index to charaterizing soil macropore quantificationally through digitalizing and analysising the photo of soil section;(3) comparing the shapes of macropores among soils, which reasons were discussed;(4) studying the influence of the zonal diversity, soil depth and land utilization on macropore characeristics;(5) estimating the space variability of macropore in the microscale using spore variability index;(6) analysising the connectivity and sinuosity of macropore using preferential flow breakthrough curve;(7) discussing the feasibility of indicating the preferential flow degree using macroporosity and macropore perimeter.

系统划分了大孔隙类型；描述了大孔隙形态；通过对土壤切片图像数字化处理和分析，获得了描述大孔隙特征的两个基本指标：大孔隙度和周长，并对大孔隙进行了定量化地描述；比较了各土类之间大孔隙的形态差异，从土壤发生学的角度对其原因进行了分析；研究了地带性差异、土壤层次和土地利用方式对大孔隙特征的影响；阐明了小尺度范围大孔隙的空间分布特征；结合Br〓标记优先水流穿透曲线分析了大孔隙的连通性和弯曲性，探讨大孔隙形态指标评价大孔隙优先水流作用强弱的可行性。

Feller(1954) identified one of the new boundary conditions as the one describing this phenomenon and introduced finite sojourn time at the boundary for one dimensional diffusion processes and referred to such a process as "elementary return process".

为刻划这一现象，1954年Feller在边界上引入了有限的逗留时间并且把这类过程称为"基本的返回过程"。

This method is cited in female somatotype, and the basic parts of female somatotype and the classification indexes are also given.

根据对300多位18~24岁女性的实际测量数据，通过聚类分析，提出了人体体型分类必须按基本部位进行。

First, we discuss the classification of existing spatial indexing methods and point out the problems of them. Second, the approximate representation of spatial objects is given. Third, the structure and the algorithm of CP tree, which based...

本文首先介绍了目前常用的几类空间索引技术及其特点，接着讨论了面向地理信息的空间索引技术面临的基本问题，提出了基于凸多边形的空间索引结构—— CP-树，并侧重分析了其空间运算算法及时空效率，最后指出了空间索引技术所存在的问题及下一步的研究方向。

Four main types of spatial binary links are investigated in details for kinematic synthesis both in precision-position synthesis and multi-position synthesis. In terms of the invariants of spherical curve and cylindrical curve, the mathematical models of adaptive fitting sphere and cylinder are constructed by means of the saddle-point programming.

再次，根据常见空间机构运动副组合的约束曲线与约束曲面的曲率理论，阐述了空间机构运动综合的基本要素及其不变量拟合理论与方法，研究了有限位置和多位置情况下，自适应综合方法在空间S-S、C-S、C-C和S-C四类二副杆组运动综合中的应用，实现了自适应综合方法从平面到空间的扩展。

In this paper, three statistical methods are proposed for microarray data analysis.

聚类分析是一种对数据进行分类的基本的统计方法。

But that confidence eroded for much of Monday, making for erratic trading on Wall Street as investors turned against companies whose business is to produce commodities and basic materials.

但是这种信心在周一的大部分时间里逐渐流失，随着投资者对商品和基本材料类上市公司的态度转冷，造成华尔街的交易杂乱无章。

Commencing from the character analysis of overall stiffness matrix of finite element method, the author brings forward it which is important to realize full nonzero memory of overall stiffness matrix, obtains correlative interlink of nodal point from analyzing affiliated element of nodal point, conforms every submatrix's position in overall stiffness matrix, realizes full nonzero memory of overall stiffness matrix.

论文根据面向对象程序设计的特点，建立了有限元模型的相关类，给出了基本的程序设计框架。

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。