查询词典 flow point

At the same time, combining with the actual condition of delivery pipeline of our country and some prevalent leak detection and location methods, this paper raised a method, which is based on wavelet analysis and negative- pressure-wave to detect and locate the leakage. Jobs in the paper are as follows:As affected by gas density, pressure, specific heat and pipe material, the velocity of negative-pressure-wave improved depending on the energy conservation. At one time, taking the affection of velocity of gas flow, the location formula was modified in some degree.When locating the leaks with location formula, the iterative approach algorithm was adopted as a new method to increase the location accuracy level of system.Multi-scale decomposition and reconstruction of wavelet transform is utilized to filter the noise of negative-pressure-wave, which was brought by leakage. With the capacity to detect the signal singularity fast and accurately, wavelet transform was used to catch the break point of pressure signal. The work improved the accuracy of At in location formula, accordingly improved the location accuracy.Wavelet is a suitable tool for signal analysis. The distinct character is that the mother-wavelet is of optional. That means choosing different mother-wavelet will get different analysis result. So we studied how to choose mother-wavelet and its scale for signal singularity detection. The method is to choose a wavelet by regularities of the wavelet and the signal.Finally, a plan, which bases on SCADA system for inspection and detection of natural gas leakage, is proposed in the article.

其中，主要进行了以下几方面的工作：针对泄漏产生的负压波在管道中的传播速度受媒介的密度、压力、比热及材质等因素的影响，而非声波在空气中传播的速度，本文利用能量守恒原理，对其进行了修正；考虑到管内气体流速对压力波速的影响，对原始的负压波定位公式进行了一定程度的改进，并在利用定位公式进行泄漏点定位时采用逐步迭代逼近算法，提高了系统的定位精度；利用小波变换的多分辨率分解和重构技术，对采集到的管道发生泄漏时产生的负压波信号进行了降噪处理；并利用小波变换技术对信号奇异点的快速、准确的识别能力，对经上述消噪后的负压波信号进行了奇异点捕捉，精确捕捉的结果提高了定位公式中上下游站点采集到的负压波奇异点的时间差△t的精度，从而进一步提高了定位的精度；考虑到小波变换是一种基波可变的信号分析工具，也就是说，不同的小波基波对信号分析的结果将有很大差别，这势必影响最终的处理结果，因此，我们又对比分析了本课题中小波基及尺度的选择问题，依据规则性系数相似性原理对母小波的选择进行了探索性研究；最后，还提出了基于SCADA的泄漏检测与定位系统的软件开发构想及系统的嵌入方案。

Central is from a strategic point of view of safety issues, hopes to achieve macro-control of the rational flow of funds.

中央是从战略的角度来看，安全问题，希望实现宏观调控的合理流动的资金。

Effect of Friction Movement of Choke Point, Reduction in Max Flow

摩擦的影响堵塞点的运动，最大流量的降低

The mask applying to experiment is opened up and that the mask exposure's device is designed and done. The technologic flow of the MEMS unit's manufacture combining optical score, sacrifice layer, chymic deposit with the SL prototyping technology is researched and experimental sample is done. Taking 3D capacitance micro actuator done by RP technology as a example, the main point of the manufacturing technics is illuminated, the new way manufacturing complex micro mechanical structure is explored.

在介绍了微电子机械系统基本情况的基础上，首次提出了将RP技术应用于MEMS的思想以及平面掩膜式光固化快速成型方案；开发了实验用掩膜，设计并制作了平面曝光成型的实验装置该装置；首次研究了将光刻技术、牺牲层技术、化学淀积镀膜与光固化快速成型制造技术等相结合，来制作MEMS件的工艺流程，并制作了实验样件。

Hydraulic conditions and water balance conditions Generally heating, air-conditioned closed loop pipe network are all pipe network, and its hydraulic system condition is the pressure point, the pipe flow, pressure.

二、水力工况和水力工况平衡一般地说供热、空调的管网都是闭路循环的管网，其水力工况是指系统各点的压力，各管段的流量、压差。

It is the research hot point for studying bubble coalescence mechanism in the multi-phase flow and related fields.

对气泡聚并行为机理进行理论与实验研究，是多相流及相关领域内的研究重点与热点。

That is, both numerical simulation and model experiments are complemental to each other. The main point of the thesis are as following:1. Vertical pipe inlet/outlet is simplified as an axisymmetric model in the research, and flow field is simulated with second-moment Reynolds stress model and VOF.

本文的主要工作有： 1、将竖井式进／出水口概化为轴对称模型，应用雷诺应力模型和自由面常采用的VOF法，对抽水和发电工况下竖井扩散段、孔口、防涡梁下的水流流动特性进行了数值模拟。

When the flowing pressure is lower than the saturation pressure,the inflow performance curve concave to the pressure axial causing a maximum flow rate point.

当流压低于饱和压力以后，流入动态指示曲线凹向压力轴，会出现一个产量最大点。

After analyzing the paleogeographic reconstruction and the paleo Tethys Ocean flow surrounding the Tarim plate, a point was made that the alteration of conodont faunas of the Ordovician on the Tarim plate was jointly caused by the plate tectonics and ocean currents.

经过对奥陶纪全球各板块古地理位置和塔里木板块周边古特提斯洋洋流情况的分析，提出塔里木板块奥陶纪牙形石动物群分区归属期次性变化是由板块运动和洋流共同作用导致的。

Yao Jinbo says,"But besides, include souvenir badge of Olympic Games of 、 of counterfoil of entrance ticket of Olympic Games match the cession of the Olympic Games article such as 、 kit, and Olympic Games Lv swims 、 weak point hires the news service such as the room, also brought considerable flow for us."

姚劲波介绍说，"但除此之外，包括奥运比赛门票票根、奥运纪念章、运动服等奥运物品的转让，以及奥运旅游、短租房等信息服务，也为我们带来了可观的流量。"

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。