关系数据系统

Finally, the study primary indicate three ecological zone ,named urban core zone, urbanize zone, banlieue, and defined itself ecological relationship. Simultaneity, this syudy indicate cardinal urban space development problems about population, land, economic activities by the spatial structure analysis. And it directs this problems to offer countermeasure.

进而利用台中市相关数据初步地辨识出都市中心、都市化地区及市郊区等三个都市生态空间区域，指出其生态关系，并透过空间结构分析明确台中都市发展在人口、土地和经济活等三方面的主要问题，从环境保护的角度，对台中都市生态系统空间结构的问题提出改善建议，供台中都市空间规划参考。

According to either sequence data sets or gene arrangement features at both gene junctions, Brachyuran crabs were monophyletic and divergent between Heterotremata and Thoracotremata. Potamoidea represented by S.

本文基于基因序列和排列数据的系统发生分析都支持短尾类是一单系群；异孔类和胸孔类互为姐妹群；以长江华溪蟹为代表的溪蟹总科与扇蟹总科、梭子蟹总科有较近的亲缘关系。

By using the group-chain, the wavefunctions of the 4f〓 configuration for RE ions are also expressed as linear combinations of group-chain basis functions in Butler's irreducible representation notation. The matrix elements of the CF Hamiltonian then are calculated by means of the Wigner-Eckart theorem and factorization lemma of the jm factors. Before the CF level fitting, a point-charge calculation of the conventional CF parameters B〓 has been performed by means of the lattice-sum technique from the known crystal structure data. The corresponding parameters in the group-chain are calculated by the conversion relationship between two schemes that proved identical in essence, which are usually used as initial values in the fit to the experimental levels. The ratios of the same k-value CF parameters are suggested as the constraint conditions in the fit, in order to utilize fully the symmetry distortion degree of the studied system.

利用群链理论，属稀土离子4f〓组态的波函数表示为以不可约表示标记的群链基波函数的线性组合；借助Wigner-Eckart定理和2jm和3jm因子的分解定律计算了晶场哈密顿的矩阵元；根据点电荷模型和已知晶体结构数据，利用点阵求和技术计算得到传统晶场参数B〓初值，相应的非传统形式的群链参数初值则由两种方案下的转换关系求得；这些初值通常作为非线性拟合晶场能级计算的初值，系统的对称性畸变信息则反映在以同阶晶场参数的比值作为能级拟合的约束条件。

It is important to make clear whether the steel industry has the characteristic of scale economy or diseconomy of scale and the relation between efficiency and market structure which is the foundation of making reasonable industrial policy.

为此本文首先采用数据包络方法测量和分析钢铁企业技术效率、纯技术效率和规模效率，随后从企业的角度系统的分析钢铁钢铁行业市场结构、企业规模与企业效率之间的关系，得出的结论是我国主要钢铁企业存在规模不经济特征，大企业相对小企业没有效率优势；市场力量假说和效率结构假说在我国钢铁业市场均不成立。

CRM concept governs the process of system design and DM method used in it.

系统设计的过程中运用了数据挖掘的方法，并且始终贯穿了客户关系管理的思想。

The standard applied modes of geometric flatness in new GPS(geometrical product specification),including the duality principle and common operation technology in new GPS system,and the expression,algorithm,data processing issues of the theoretical,specification and verification model,were investigated.

研究了新一代GPS中几何平面度标准的应用模式，包括新一代GPS体系的对偶性及共性操作技术以及公称、规范和验证模型的表示、算法和数据处理。开发了试验性软件系统，通过可视化方法表示了它们的关系，实现了GPS几何平面度标准在烟机零件中的具体应用。为进一步应用新一代GPS标准以及规范表达产品的设计、制造、检验所要求的统一公差信息提供了较好的借鉴

A XENIX-based multi-user relational database management system featuring source language and data file compatibility with dBASE III plus , as well as dBASE III plus record locking and file locking system.

一种基于XENIX的多用户关系数据库管理系统，其特点是源程序和数据文件与dBASE III plus 相兼容，同时具有dBASE III plus 的记录锁定和文件锁定功能。

In this paper,taking the gas pipe network system as an example,the author analyzes the feature of geographical network,and gives the conceptual model of geographical network,deeply researches the establishment of the model of network data and the topology relation of gas pipe-network.

以城市燃气管网系统为例，在分析地理网络特征的基础上，提出了地理网络的概念模型，重点研究燃气管网数据模型和网络拓扑关系的构建。

Compared with traditional DEM or TIN based methods, this pure vector approach obtains not only the topological structure of drainage system in planar graph, but also the valley distribution polygon range. Depending on geometrical computation and judgment of vector line, polygon, the structured properties in drainage representation is enhanced, avoiding the case of noise disturbance in DEM based method. The core algorithm makes use of the ability of Delaunay triangulation in detecting hierarchical structure of each contour line.

中文摘要：基于Delaunay三角网模型在矢量等高线基础上通过弯曲特征分析，给出了一种地形结构特征提取及谷地树组织的方法，与传统的基于DEM或TIN数据结构提取地形特征的方法相比，该方法不仅得到了谷地系统在平面图上的拓扑结构，还获得了河谷在空间分布上的汇水范围，依托矢量线、多边形的几何关系判断，增强了谷地树组织中的结构化，避免了DEM方法中的噪音干扰，方法的核心是Delaunay三角网在单根等高线弯曲深度表达上的层次结构识别。

From the view of torque controlling strategy, the relation between the torque controlling strategy such as the electric current feedback method、 PWM open loop method etc and the vehicle driving way is analyzed firstly, then the conclusion could be drawn that the PWM open loop method has more advantages than the electric current feedback method when they are both used in the same vehicle which is direct driving by hubcap motor. Secondly, based on the electric motor mathematic model and its experiment, a new permanent brushless dc motor phase electric current detector method in which a digital signal processor and single current sensor are used is introduced.

从转矩控制策略角度来看，分析了电流反馈法以及开环PWM电压调速控制方法与车辆的驱动方式关系，得出了电机驱动电压受限的情况下，无论是从对车辆的动力性能影响还是从对车辆的驱动要求来讲，开环PWM电压调速控制方法较电流反馈法更适用于以轮毂电机直接驱动方式的两轮电动车中；其次，根据电机的数学模型以及电机试验波形，提出了一种利用数字信号处理器以及单个电流传感器检测三相永磁无刷电机电枢电流的新方法，这种方法具有较强的适应性、实时性，它可以根据控制系统的要求，适时地提供所需电流数据，是目前许多文章关于无刷电机相电流平波的重要技术基础。

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。