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In this paper,the branch pipe network as a virtual ring pipe network is proposed,and the equation for it has been set up.It is proved that Kirchhoff law of ring pipe network is a kind of special form of equation,which is the virtual ring pipe network.

本文中提出将树枝管网视为虚环，建立了虚环方程，证明了环形管网的基尔霍夫定律是虚环方程的一种特殊形式，环形管网方程和虚环方程互相兼容，可联立求解。

The name is "Shanghai Yuezhen Industrlle CO.,LTD." Now we have two boards, but a leading body manege. It is an entorpris of producing plastic products. It is expert in which produce all kind of PVC-U Cavity wall Corugated pipe, Ridded pipe, PE pipe protocting fibre optise Cable and pipe fiting. The products have been maily used in constructtion projects of telecommuniction line, power transmission and municipal engineering. Such as, Shanghai the Bund project, New Railway station, North-South Skgway, Shanghai inside and outside highway traffic looplline, Nanpu Bridge, Pudong International Airport, Songjiang University urban area, etc. As well as our prodcts ave slid well to mang prainces in Zhejiang, JiangSu, Anhui, Henan, Jiangxi and GuangXi.

企业专业生产PVC-U双壁管波纹管、PVC-U加筋管、PE光缆护套管的工业企业，产品主要用于邮电通信、电力、市政工程建设项目上，上海外滩一期、二期、新客站、内外环线、高北高架、南浦大桥、杨高路远东大道、浦东国际机场、松江大学城等重大工程建设项目都广泛使用我厂的产品，产品也遍布浙江、江苏、安徽、河南、江西、广西等省市。

The paper studies fault diagnosis technology based on fruticose gas pipe network which is universal in small towns,and gives a particular description of domestic and foreign gas pipe network fault diagnosis technique based on hardware and software currently. The author uses graph theory to build up hydraulic analysis model of natural gas network and presents its solution methods. Besides, the author works out the relation between gas pipe pressure and flux in unsteady condition of fluid flow according to pressure boundary condition and differential equation group, and puts forward fault diagnosis methods and steps of the fruticose natural gas pipe network of middle pressure based on the simplification of this relation.

本文针对小城镇比较普遍的枝状天然气分配管网进行故障诊断技术研究，详细叙述了目前国内外基于硬件和软件的燃气管网故障诊断技术，利用图论理论建立了天然气管网水力分析模型并叙述了其求解方法，根据燃气管内流动的微分方程组和压力边界条件求解出非稳定流动时燃气管道压力和流量的关系，并在对此关系进行简化的基础上提出了基于中压枝状天然气管网的故障诊断方法和步骤。

In order to solve the inconvenience of in-situ welding of hot gas conduit pipe pressure shell and eliminate the undetermined factors in safety evaluation, the present invention proposes one connection structure for hot gas conduit pipe pressure shell, and the structure includes hot gas conduit pipe pressure shell, movable loose flange, double-headed screw bolt and nut for fixing the hot gas conduit pipe pressure shell onto the reactor pressure shell and the steam generator pressure shell.

为了解决热气导管压力壳现场焊接带来的各种不便和安全评价时的不确定因素，本发明提出了一种热气导管压力壳连接结构，包括热气导管压力壳、用于固定热气导管压力壳至反应堆压力壳和蒸汽发生器压力壳的活套法兰、双头螺柱及螺母；第一活套法兰压在热气导管压力壳一端的凸缘上，并通过第一双头螺柱及第一螺母使得热气导管压力壳的一端与反应堆压力壳上的法兰紧密联结；第二活套法兰压在热气导管压力壳另一端的凸缘上，并通过第二双头螺柱及第二螺母使得热气导管压力壳另一端与蒸汽发生器压力壳上的法兰紧密联结。

Apart from the working limitations resulting from its structural property, the flat plate heat pipe carries out heat dissipation through the evaporation and condensation of the working fluid. Thus, if the working angle of the fluid is adverse to its backflow, the heat pipe will fail easily. Furthermore, not the orientations of all the heat sources are favorable to the functioning of the heat pipe. To compensate for this drawback, this research focuses primarily on the development of a composite structure which will reduce the effect of gravity on the working fluid. Generally speaking, the heat pipe is divided into three main categories: the groove type, sintered metal type and mesh screen type, as shown in Table 2. As far as capillary force is concerned, the sintered metal type and mesh screen type show better performance. As mentioned in R.

平板式热管除了因其结构特性而产生的工作极限之外，由于其作用乃是透过工作流体的蒸发及凝结进行散热，故若是其工作角度不利于液体之回流，便容易使热管失效，且并非所有之发热源都是位于有利于热管工作之位置，因此本研究之主要目的为设计一可减少重力对工作流体影响之复合式结构；一般而言，热管之结构大致可分为沟槽、烧结及网格三种(如表2所示)，其中烧结及网格结构有较佳之毛细力，在 R。

Wavelet packet decomposition can decompose high-frequency part of signal. In order to obtain the energy rate index of each node this paper advances apply wavelet packet decomposition method to node response of pipe. And then use statistics method to analysis the energy rate index indicator of various nodes in pipe. Results show this method not only can detect the locations of damage in pipe, but also can get a preliminary study for quantify the damage degree damage of pipe.

本文提出将小波包分解方法应用于管道的节点响应，得出各个节点的能量率指标，并利用数理统计方法对管道上各个节点的能量率进行统计分析，结果表示该法不仅能确定管道的损伤位置，而且还能对管道损伤程度的定量分析作一个初步的研究。

The results show that the porous pipe quantity, head loss and hydraulic deviation rate of the porous pipe would increase while water head in entrance, pipe length and porous pipe permeability increasing. The head loss mainly concentrated on the top half of the porous pipe.

结果表明，随着进水口压力、管长和微孔渗灌管透水性能的增加，微孔渗灌管水流量、沿程的水头损失和水力偏差率增大，且水头损失主要发生在微孔渗灌管靠近进水口的前半段。

The fuse pipe is the main part of fuse,it is made by installing the fuse wire in the porcelain pipe,filling the quartz sand in the porcelain pipe and sealing to-ends of pipe.

熔断管是熔断器的主要部件，它是由熔丝装在瓷管中，并在瓷管中充填石英砂，两端密封而成。

This article introduces joint type of copper-aluminum pipe,including straight pipe butted joint,flared pipe insert joint,reducing pipe insert joint and reducing pipe lap joint,and the welding technologies in domestic and abroad,including friction welding,energy storage welding,flash welding,resistance welding,braze welding,cold butt welding and ultrasonic welding.

介绍了铜铝管的接头形式，主要包括：直管对接、扩口管插接、缩口管插接和缩口管搭接；以及国内外的焊接技术，主要包括：摩擦焊、储能焊、闪光焊、电阻焊、钎焊、冷压焊及超声波钎焊等。

The basic thoughts of applying genetic algorithms in pipe network design is: concerning the objectives of pipe diameter, defining the costs of pipe network as objective function, and considering hydraulic situation(continuous equation and cycle equation of the crossover of pipe network), velocity of flow of pipes as restraining elements, this thesis carries out the optimal calculation on the design of pipe network.

运用遗传算法进行管网优化设计的基本思路是：将管网管径作为求解对象，以管网造价为目标函数，以水力条件（管网节点连续方程和环方程）、管段流速作为约束条件进行优化计算。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。