关系数据系统

The results show that the equations have benefit to the deduction of the pantograph's mechanical differential equations.

研究结果表明：利用升角与升弓高之间的关系，可简化受电弓运动微分方程的推导；应用所建立的力学模型、实测数据以及简化公式可更准确地分析和计算弓网系统的力学行为。

Being the prolegomenon of the special issue, this paper briefly discusses the relationship between ecosystem management and Eco-informatics, the society need of knowledge development, and the main research area.

该文在简要地论述生态系统管理与生态信息科学的关系，学科发展的社会需求和主要研究领域等问题的基础上，概要地介绍了研究小组近年来在生态信息科学与数据资源管理领域的主要工作研究进展。

So, questions remain unsolved regarding the origin time and pattern of pteridophyte and the internal phylogeny of its members. It is suggested that future studies of the origin and evolution of pteridophytes place emphasis on synthetic analysis of morphology, stratigraphic sequences, and multi-gene systematics.

它们的起源时间和方式及其内部各类群的系统发生关系等诸多问题的解决，还有待于大量形态学和不同分子水平上的实验数据的进一步积累，并结合其直接的化石证据进行综合研究。

In this paper, on the basis of fuzzy quotient space theory, cluster analysis methods based on fuzzy similarity relations and normalized distance are proposed to solve data structure analysis of complex systems.

在商空间理论基础上，提出了基于Fuzzy相似关系和归一化距离的聚类分析方法，用以解决复杂系统的数据结构分析问题。

For the characteristics of closed chain with redundant coordinates, the Routh equation was applied to developing a dynamic model of the biped robot with heterogeneous legs to which the relationship between force and moment of the two legs are evaluated, thus giving dynamically the direct and inverse solutions to the Routh equation.

针对这一闭链并含冗余坐标的完整系统的特点，采用罗司方程建立了异构双腿行走机器人动力学模型，给出了异构双腿关节运动和力矩之间的关系以及动力学正逆问题的求解方法，并利用典型步态数据对所建模型进行了仿真计算。

Furthermore, all the data created and used by the system is persisted in a relational database.

此外，所有的数据创建和系统使用的是坚持一个关系数据库。"/页"

The items of Zernike polynomials have corresponding meanings of Seidel aberrations. The method of using Zernike polynomials to fit optical surfaces has been widely used in project, optical design software and interference check.

由于Zernike多项式的各项与光学像差有相应的对应关系，用Zernike多项式对镜面面形数据进行处理的方法已经广泛应用于工程项目、光学系统设计软件和干涉检查等。

The undistinguishable relationship, the attribute -oriented generalization and the reduced operation algorithm are discussed. The n a tapping method for attribute-oriented RST data is presented. Applying the b est reduction and kernel operation to the differential matrix, the decision rule s in logical meaning are given.

在此基础上，提出了一个面向属性的RST的数据挖掘方法，即基于系统的关系数据库形成差别矩阵，并对差别矩阵施行最佳约简和核操作，给出在逻辑意义下的决策规则，从而完成领域的知识发现。

This paper analysed the structures of eight lightweight worsted fabric s.

运用灰色系统中的灰色关联理论对结构参数和服用性能指标进行数据处理，分析了轻薄型精纺毛织物的结构参数与服用性能的关系。

In the present study, mitochondrial 12S, 16S and nuclear 18S, 28S rDNA fragments of ten species of spiders were amplified and sequenced. Using neighbor-joining, maximum parsimony, maximum likelihood methods and Bayesian analyses, the phylogenetic relationship between Deinopoidea and Araneoidea was inferred from the combined DNA sequences of 12S, 16S, 18S and 28S rDNA fragments. The resulting phylogeny indicated that: Deinopoidea and Araneoidea did not form single clade.

本文首先测定了包括复杂生殖器类中妖面蛛总科、园蛛总科和非圆网蛛类等3个类群在内的9科10种蜘蛛线粒体12S rDNA、16S rDNA及核18S rDNA、28S rDNA等4个基因片段序列，并基于4个基因序列的整合数据，分别通过邻接法、最大简约法、最大似然法和贝叶斯法分析，对园蛛总科和妖面蛛总科蜘蛛之间的分子系统关系进行了探讨。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。