层拓扑

This article detailedly expatiated upon the principles, contents and methods of cropland classification; it analyzed the necessity to combine the work of cropland classification with GIS technology, summarized the attributions of ARC/INFOand some other related softwares; it established the technologic route of cropland classification supported by GIS, by a case study in Liwu Town,Li County Hebei Province, this article expatiated the practicable mechanism of combining the function of ARC/INFO with the work of cropland classification, and put forward some new ideas and approaches of utilizing GIS: this paper put forward the idea of coding the polygons in the basic graphic database such as soil map and land use map according to their attributes, and put forward the detailed coding project; based on the code databases, it expatiated upon the detailed approaches to create single梖actor map and output the final classification map; it put forward the principles and the method of creating classification units in the environment of GIS, that is how to keep the lines of soil polygon, the border of districts and the important objects such as residential areas, banks of rivers and roads ,and how to overlap single梖actor soil map and land use map, and to delete some vector lines of the overlapped map appropriately; it detailed the methods of creating mathematic model of classification coefficients in the environment of computer, and used FOXPRO6.0 programs to realize the automation of calculating coefficients; it represented the method of plotting the final map by overlapping various coverages according to the code tables and lookup tables, the process of outputting the cropland classifying map was finished by program.

本文法对耕地等别划分的原则、内容及方法作了较详细的阐述，介绍了多系数综合修正法的耕地等别计算方法及其具体应用和AHP的确权方法；分析了耕地等别划分工作与地理信息系统技术相结合的必要性，简要介绍了地理信息系统软件ARC／INFO及其他相关软件的功能特点，制定了地理信息系统支持下耕地等别划分的技术路线，通过对河北省蠡县蠡吾镇的实证研究，重点阐述了ARC／INFO及相关数据库软件与耕地等别划分结合的有效机制及GIS应用的一些新思想、新方法：提山了对土壤图和土地利用现状图等基础图形数据库进行特征编码的思想和具体的编码方案，阐述了基于与图形库相链接的特征编码表，单因素图提取、成果图的输出的具体实现方法；提出了GIS环境下耕地单元划分的原则和方法，即在保留土壤因素图斑界线、行政界线和重要地物等的原则下，将土壤单因素图和土地利用现状图进行拓扑叠加，对叠加图中的矢量线进行适当的删除；阐述了在计算机环境下，耕地分等参数计算模型建立的方法，并用FOXPRO6.0语言程序实现了参数计算的自动化；阐述了根据图形库特征编码表和建立绘图符号查找表，按不同图层叠加绘制成果图的方法，该过程用命令程序实现耕地等别图的输出。

For two examples, result testifies that it is feasible to use in nonlinear restriction optimization. Chapter 3 is important part in the paper. Analyze and research BP network, concealed node number of network former frame newly. Give new supplement and advice about How to select study velocity and activation function in BP algorithm.

第3章是论文中最重要的一章，通过实例分析研究了BP网络，对网络模型结构的隐层节点数进行分析和新的探讨；对BP算法中的学习速率和激活函数的选取进行了新的补充和建议；对网络的拓扑结构进行了新的构造；对人工神经网络收敛依据提出了新的判断原则。

Firstly a qualitative criterion for determining the space between adjacent sections in the sampling process and Gaussian smoothing algorithm is proposed. Then a topological reconstruction method is given. At last a new reconstruction method based on the similarity between adjacent sections is proposed.

首先提出了确定断层间距的定性方法和数据平滑处理的高斯方法，然后给出了一种拓扑重构方法，最后提出了一种基于相邻层轮廓相似性的曲面重构新方法。

In chapter 2, basic knowledge of graph theory and communication correlation to invulnerability on topological structure of RCN is introduced.

文章第二章，介绍了与野战地域通信网拓扑层抗毁性相关的图论及通信基础知识。

This thesis mainly discusses the invulnerability on topological structure of RCN.

本文针对野战地域通信网拓扑层抗毁性进行了研究。

The net structure of the cement rotary kiln control system has three layers.

所建立的系统采用3层的网络拓扑结构。

The difference is that the remote end of a leased line is connected directly to a single router.

不管在任何实体网路的拓扑下，讯框中继设备和路由器都必须要在网路层作应对的动作，基本上路由器必须知道特定的介面连接到各种不同网域，相同的问题也存在一般专线连接当中，不同的地方在专线是由远端连接到特定的路由器。

First, based on analyzing the function model of the NC machine tool sharing system, a 4-layer architecture for net is proposed and constructed; Second, the function-oriented model of information flow for multi-agent, which is employed to implement the interactions between the 4-layer architecture, is constructed; Third, the station function for agent is defined, based on which the negotiation mechanism is built.

首先，在分析功能模型的基础上，提出并实现了资源共享的四层网络拓扑结构；其次，构造了面向设备资源共享功能的智能体信息流模型，以实现四层结构之间的交互；其三，定义了智能状态函数，并以此为依据，建立了智能体协商机制。

Through PCR and sequencing, a fragement sequence with lamin gene feature was obtained. It was of of transcriptional activity. In addition, we also cloned and identified giardial DNA topoisomerase gene.Our phylogenetic analysis showed that although Giardia diverged early but not first, thus, it is not as primitive as thought before.

然后进行了核纤层蛋白基因的扩增和鉴定，获得了一个具有明显核纤层蛋白基因特征的基因序列片段，并证明它是表达的且不具内含子；此外还克隆鉴定了作为核骨架重要成分的DNA拓扑异构酶II的基因；在此基础上结合已报导的不同进化地位生物上的数据进行了分子系统学分析，结果显示贾第虫虽然分支较早，但不象过去所认为的那么原始。

A method of polygon simplification based on Strip-Tree in scaleless GIS is presented in this paper through an all-sided analysis of this problem. Maintaining the correctness of the polygon layer's topoloty, it simplifies the polygon layer according to the output scale.

在对此问题进行全面分析的基础上，提出了一种基于Strip-Tree的多边形图层化简策略，在保持输出数据拓扑结构正确的前提下化简多边形图层，且保持了较高的时空效率。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。