查询词典 leakage

This paper combines with pipeline delivery of our countrys actual conditions and other methods of detection and location. To the leakage characteristic of the fault to the long-distance natural gas pipeline, a method is raised, which is on the basis of wavelet and negative-pressure-wave to detect the leakage and locate. Jobs in this paper are as follows:Multi-resolution decomposition and reconstruction of wavelet transform is utilized to filter the noises, which the leakage brings the noises of negative-pressure-wave. The research is worked in the wavelet and wavelet packet filter. The wavelet transform have a fast and accurate recognition capability to signal singularity. This paper chooses wavelet technology to catch the break point of pressure signal.

本文结合我国管道输送的实际情况和目前现有的各种泄漏检测与定位方法，针对天然气长输管线泄漏故障的特点，提出了基于小波分析和负压波相结合的方法检测泄漏并定位，其中主要进行了以下几个方面的工作：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降噪处理，并对小波及小波包优化的降噪效果进行对比性研究；利用小波变换技术对信号奇异点的快速、准确的识别能力，捕捉负压波信号的突变点，从而判断是否有泄漏发生。

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。

For expeller seal combined with packing, leakage should be checked in place with packing: before the motor starting, open shaft seal water. If excessive leakage, please tighten gland nuts until guttate leakage.

对于付叶轮加填料组合式密封，应检查填料处泄漏量：启动前，先打开轴封水，如果泄漏量过大，应拧紧填料压盖螺母，直至泄漏呈点滴状为止。

In this paper, we systematically analyze the reason or factor effecting the leakage current, and adopt guard ring to reduce PIN-detector leakage current. The result indicated that the leakage current have been reduced 0.5 1 order by guard ring.

本文系统地分析了漏电流产生的机理及其主要的影响因素；在现有工艺条件基础上，采用保护环结构使PIN电流型探测器的漏电流减少了0.5～1个量级。

Modern power spectral estimation is applied in leakage current analysis in thispaper and the global character of leakage current is obtained by associated analysis ofpower spectral character and root mean square value of leakage current.

将现代功率谱估计的方法应用于泄漏电流分析中，通过泄漏电流的功率谱特征与泄漏电流时域特征中的有效值的联合分析，更好地把握了泄漏电流的总体特征。

Yanhuanding Yang Huang works 12 pumping stations, pump station 8 appearing leakage problem of erosion, which have a serious threat to the Yellow Yanhuanding the normal operation of the project In view of the pumping station pumping soleplate leakage have serious corrosion, in order to ensure the normal operation of the pumping equipment, since 1996, study on pumping corrosive leakage process technology are started.

盐环定扬黄工程12座泵站中，有8座泵站出现渗漏侵性问题，严重威胁盐环定扬黄工程的正常运行。鉴于各泵站泵房底板渗漏腐蚀严重，为保证泵站设备的正常运行，自1996年开始就对泵站渗漏腐蚀的处理技术进行研究。

The regulating reservoir water leakage enters the oxygen unit, through the biological degeneration function, enable the organic pollutant to obtain the thorough degeneration, the good oxygen unit enters the water to enter the precipitation unit, the precipitation unit water leakage flows automatically enters the middle basin; In the middle basin by the pump promotion to the micro flocculation unit, in the water before the residual soluble organic matter and the filtration throws the coagulant response production suspended solid which adds through the filtration pot filtration, the micro flocculation filtration water leakage enters the disinfection area, achieves the sterilization goal in the disinfection area using the chlorine dioxide strong oxidability.

调节池出水进入好氧单元，通过生物的降解作用，使有机污染物得到彻底的降解，好氧单元进水进入沉淀单元，沉淀单元出水自流进入中间水池；在中间水池由泵提升至微絮凝单元，水中残留溶解性有机物与过滤前投加的混凝剂反应生成悬浮固体通过过滤罐滤除，微絮凝过滤出水进入消毒区，在消毒区内利用二氧化氯的强氧化性达到杀菌目的。

2Soil column leachate experiment shows, soil texture and soil section form are the main factors affecting the nitrate leaching; in soil organic fertilizer produce a nitrate leaching process, during five-month experiment, nitrate content has be increasing in leakage solution, organic fertilizer applying decrease the pH and increase the electric conduction of leakage solution, there is positive action between nitrate content in leakage solution and electric conduction, which shows that nitrate-N accumulation during organic fertilizer applying is one of the main factors for soil salification; for decrease the leaching of the nitrate-N in soil, in sandy moisture soil the best amount of organic fertilizer should be 7.5～ 15 t·hm~(-2), in Loamy moisture

在小麦-玉米轮作体系上投入化肥氮300kg·hm~(-2)N和有机肥22.3t·hm~(-2)折N261.2kg·hm~(-2，能使农田氮素收支达到平衡，在兼顾环境效益的基础上获得了较高的产量效益。并通过肥料效应函数和硝态氮累积效应函数进一步预测最佳施肥组合，即化肥氮施用量为N226.5kg·hm~(-2)，有机肥用量为39.9t·hm~(-2)折N466.8kg·hm~(-2，其中小麦季施化肥氮105.85kg·hm~(-2)N、有机肥30t·hm~(-2)折N351kg·hm~(-2，玉米季施化肥氮120kg·hm~(-2)N，有机肥9.9t·hm~(-2)折N115.8kg·hm~(-2。同时，磷素平衡分析表明，在施用有机肥的基础之上，化学磷肥的施用量应适量的减少或不施。

It is indicated that this loss will not change with the increase of the Reynolds number but the intensity of the passage vortex increases with the decrease of the Reynolds number. The tip leakage flow will weaken with the increase of the passage vortex because of the interaction between the passage vortex and the tip leakage vortex, and the position of the tip leakage vortex is more close to the middle of the passage. In addition, the distributions of the total pressure loss and the flow angle at the exit of the cascade are influenced by the intensity and the position of the tip leakage vortex.

结果表明：对于间隙存在造成的流动损失，数值模拟结果与实验结果及 Denton的预测值都十分接近，基本上不随着雷诺数的变化而变化；但是，随着雷诺数的减小，通道涡增强；间隙泄漏涡在和通道涡的相互作用中，强度减弱，在叶栅出口处的位置更加靠近中叶展；出口处的总压损失和气流角的分布也由于间隙泄漏涡强度和位置的变化而发生改变。

In the field of pipeline leakage supervising, the paper first brought out a leakage supervising method based on joule-Thomson effect and then analyzed the relation of leakage matter 、leakage part and the way optical fiber was laid. In the paper the author amply introduced the arts and crafts of optical cable construction.

在管道泄漏监测领域，论文介绍了一种基于joule-Thomson 效应的泄漏监测方法，并就泄漏物质、泄漏部位与光纤铺设方式之间的关系进行了分析和研究，比较详细地介绍了施工的工艺。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。