We extend this method to the problem of a domain which boundary is an open arc or an open segment . in this paper , we simulate the singularity of solution in extreme point of open arc or open segment by singular element 本文还把此方法推广到求解区域边界是直线段或者开弧段的情况，采用引入奇异边界单元的方法来模拟解在开边界端点附近的奇异性。
Under the premise of ensuring its accuracy of point positions , not only is vector data obtained but its compressing is also realized with a quicker speed , more accuracy and smaller storage device 该方法在确保点位精度前提下，可获得以弧段为单位的矢量数据，同时依据线状要素的形态取样，从而达到压缩数据目的，此算法处理速度快，精度高、存储量小。
Basing on key concepts and techniques in object - oriented modeling , the thesis discusses design of object - oriented spatiotemporal data model , and entirely defines and describes spatiotemporal object types that are of concern in a stdm . organization of temporal attribute data and temporal treatment of spatial object are described . spatiotemporal object operators and spatiotemporal index are logically designed 论文对模型的时态属性数据组织和空间对象的时态处理进行了描述，提出作为节点和弧段，空间位置和范围是它们的本质属性，所以只要节点和弧段的空间位置和范围发生变化，则节点和弧段发生生亡事件。
Passing analysing the link of the three - arc - sect isometric type surface , built the three - arc - sect isometric type surface equation , found the location of isometric type surface with the finite element analysis method and calculated the link intensity of the three - arc - sect isometric type surface 摘要文中对型面联接中的三弧段等距型面联接进行力学分析，首先建立三弧段等距型面方程，应用有限元法确定等距型面接触点的位置，对三弧段等距型面联接中的应力分布及大小进行分析计算。
Our product line includes honeycomb seal for turbine machines , such as aeroengines , steam turbines , gas turbines and industrial turbomachines , metallic honeycomb products including aerospace quality honeycomb core materials , honeycomb flow staightener and honeycomb rolls for nonwoven , emi shielding products and metallic catalytic converter for automobile , etc 主导产品蜂窝封严产品安达泰克科技为航空发动机燃气轮机汽轮机等透平机械的制造改造和维修提供高质量的蜂窝封严产品，包括各种规格的蜂窝封严弧段和封严环。
Fluid noise mainly comes from out put pulsation of rate of flow , the main reason of out put pulsation of rate of flow is the instant high pressure return flow that obturation cubage produced when the big round curve pressure transition . the v trough on the port plate can reduce the fluid noise . in this paper , the author based on the acting of dam a river and condensability of liquid and used matlab language as tool to calculate the v trough on the original port plate and drew out the p - t diagrammatic curve and analyzed its shortcoming and improved the design of original v trough and got that the best size of its angle was 12 . 3 and its length was 5mm and the cross section was an equilateral triangle 流体噪声主要来源于输出流量脉动，造成输出流量脉动的主要原因是闭死容积在大圆弧段压力切换时产生的瞬时高压回流，在配流盘上开设v型尖槽可降低因高压回流而引起的流体噪声，本文以截流作用和液体的可压缩性为理论依据，以matlab语言为工具，对原配流盘上的v型尖槽进行了理论计算，绘制出p - t图线，分析了它的不足，并对原有v型尖槽进行了优化设计，得出了v型尖槽的最佳几何尺寸：配流盘平面上的v型尖槽的两边的夹角为12 . 3 ，槽长5mm ，槽的横截面为等边三角形。
8 . this thesis initiates the 8 - quadrant angle computing method . this method can rapidly recognize the adjacency relationship of all the edges linked with the same node and avoid the complicated computing of trigonometric function . furthermore , this method can rapidly construct the adjacency relationship of all the arcs linked with the same node , in the construction of topological data structure in gis , which is helpful to the rapid construction of topological structure 创造性地提出了a象限角度计算法，它可以实现快速确定与同一结点相连接的所有边的邻接关系；避免了复杂的三角函数计算，而且该算法还可以在gis的拓扑数据结构建立过程中，快速地构建与同一结点相连的所有弧段间的邻接关系，为拓扑结构的快速建立创造了条件。
With fortran power station 4 . 0 , we make galerkin boundary element method program for solving laplace equation on region which boundary is a closed curve or an open arc , and the numerical experiments also prove this method is reliable . last we test the error of galerkin boundary element by numerical experimentation 最后利用fortranpowerstation4 . 0程序语言分别编写了用galerkin方法求解区域边界为闭曲线及区域边界为直线段或开弧段laplace方程的计算机程序，通过几个算例证明了该方法是有效的、是可行。
In harsh climate region , mere exists obvious local stress concentration near the upstream and downstream of the exposed - in - winter horizontal surface of the rcc dam , and the surface of spillway bucket though heat insulation is applied on the surfaces , tensile stress still exceeds the allowable one of concrete . this paper puts forward to adopt preset crack to avoid occurring more cracks . the special crack model is applied to simulate the dam preset crack , and the joint model of fracture mechanics is induced into strain - soften model 在结构措施方面，针对严寒地区高碾压混凝土重力坝坝体越冬层面的上、下游面附近及溢流坝堰面反弧段表面有明显的局部应力集中象现，在已采取一定的表面保温防护的条件下，拉应力仍然超过混凝土容许拉应力，开裂难以避免，进而提出设置碾压混凝土坝表面预留缝结构措施并对该措施进行深入研究，包括预留缝的扩展稳定和坝体沿预留缝的稳定性，以避免大坝在无措施部位开裂，解决大坝越冬层面水平施工缝的开裂问题。
