拓扑结构

Three intersection functions,such as adjacent node set,node-arc angle set and connected node set,were presented,and based on the shortest path method proposed by Dijkstra,a road guide sign model was built by using the intersection functions.

结合路网的拓扑结构，定义了用于确定指路标志的状态函数集，给出了3个描述路网拓扑特征的交叉口函数：邻近结点集、结点-弧段夹角集和连通结点集，基于Dijkstra最短路径的思想，运用交叉口函数建立了城镇指路标志的标识模型：以待标识城镇为中心，在城镇的影响区域内，通过向外搜索交叉口邻近结点集来确定指路标志的设置，并使每个结点上标识的路径都是最优的。

In this paper we investigate the dynamical properties of continuous mapson a class of hereditarily decomposable chainable continua and the structure ofthe inverse limit space using a piecewise monotone continuous map with zerotopological entropy on a finite graph as a single bonding map.

本文研究了一类遗传可分可链连续统上连续自映射的动力性质并且对有限图上逐段单调且具有零拓扑熵的连续自映射的逆极限空间的拓扑结构进行了较为细致的刻画。

Contemporary geometric topology and differential topology , and particular subfields such as Morse theory , would be counted by most mathematicians as part of geometry.

现代微分几何拓扑和拓扑结构，特别是分支如莫尔斯理论，将计算的大多数数学家的一部分几何。

This paper emploies a collection of discrete and limit topological events which simulates topological changes of Delaunay diagrams,the dual graph of Voronoi diagrams,to realize maintaining Voronoi diagrams of moving points.

通过一组离散的，有限的事件序列对其对偶图Delaunay图拓扑改变过程的模拟来实现对移动点Voronoi图拓扑结构的维护。

Buck and Boost topology switching power conversion circuits as the core of this system, ultra low power MSP430F1222 microcontroller-based controller, microcontroller produced by the PWM pulse width modulation signals, respectively, two-way control switch voltage conversion circuit the turn-on and turn-off in order to achieve the above two kinds of topology switching power conversion circuit, and then to draw power from the flow of electrical energy has been filled into the rechargeable battery, and using microcontroller A / D input voltage implementation of the monitoring, according to the input voltage switching buck - circuit at a lower cost to achieve a highly efficient energy transfer, and the circuit is simple, the parameter to determine easy, self-low power consumption,to achieve full-featured.

本系统以Buck降压和Boost升压拓扑结构开关电源变换电路为核心，以超低功耗单片机MSP430F1222为主控器，由单片机产生PWM脉宽调制信号，分别控制两路电压变换电路中开关管的导通与关断从而实现以上两种拓扑结构开关电源变换电路，进而从一直流电源中吸取电能充入可充电电池，并利用单片机A/D对输入电压实施监测，根据输入电压切换升降压电路，以较低的成本实现了高效率的电能转移，并且电路简单、参数确定容易，自身功耗低，实现功能完整。

Leveraging network structure: we concurrently develop both structures for network topology and protocols that take advantage of these structures to achieve dependable, simple, and analyzable networks.

平衡网络结构：我们并行开发网络拓扑结构和协议，这种协议利用拓扑结构实现可靠的，简单的和可分解的网络。

Otherwise, the control flow estimate makes no difference among processes which are congruent under α conversion by labeling restricted names and variables with stable names in the syntax of Mobile Safe Ambients.

在Mobile Safe Ambients演算进程的拓扑结构抽象表示基础上，通过识别可被激活的移动原语和通讯原语，计算系统运行的所有动态进程拓扑结构，并在文法规则中显示地标识约束名字和变量，使分析结果在α变换下保持不变。

According to the calibration information, Research and development status of automotive bus network and automotive calibration system is studied and the research significance is generalized. First of all, the collectivity precept for calibration system is designed, the calibration platform is set up based on the XCP Protocol and the calibration object is CAN bus network simulation ECUs. Then how to create the calibration system based on Ethernet and Series communication is expatiated, the communication way from computer to ECUs is introduced and the calibration system is tested. Then how to create the calibration system based on CAN bus communication is expatiated, the design and the interface programme are introduced and the calibration system is tested. At last the platform is used to calibrate the CAN bus network simulation system to regulate the simulation system's topology and communication speed to test the communication protocol's feasibility.

论文首先设计了标定系统的总体方案，以CAN总线实时仿真系统中的节点标定为研究对象，采用XCP协议建立具有串口、以太网和CAN总线三种通讯接口的标定平台；然后，具体开发了基于以太网通讯和基于串口通讯的标定系统，完成了上、下位机部分的软件设计，确定了标定系统在两种通讯方式下的数据处理方法，并分别应用两种标定方式标定下位机仿真系统的参数，让下位机仿真系统在规定的通讯协议和拓扑结构下进行仿真，对所设计的标定系统进行了调试；接着，设计了基于CAN总线通讯的标定系统，完成了CCP协议（&XCP on CAN&）的接口程序设计，并通过混合动力汽车一种拓扑结构的通讯仿真对所设计的系统进行了调试；最后，应用开发的标定系统，对混合动力电动汽车网络通讯协议进行了仿真研究，并根据实验结果进行了分析。

More often, we need to design subdivision schemes for certain known surfaces. Unfortunately subdivision scheme can do little for this, even for some simple but of basic importance curves and surfaces (such as ellipsoids and hyperboloids).

仅仅修改交点处的拓扑结构不能确保每条折痕整体的C〓连续性，所以我们在修改交点处拓扑结构的同时，还修改了交点附近的细分格式，从而确保了每条折痕整体的C〓连续性。

Dynamics of mechanical systems with Coulomb friction, stiction, impact and constraint addition and deletion: I theory. Mechanism and Machine Theory.

通过对变拓扑结构系统的动力学建模过程几个关键问题的分析，为进一步建立与完善变拓扑结构柔性多体动力学奠定了基础。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。