查询词典 pipe

The study results show that there is plunger-cylinder flow in the center of the pipe for the action of Casson yield stress τc.

研究结果表明，由于Casson屈服应力τ_c的作用，管中心存在柱塞流动，柱塞的半径γ_0与τ_c成正比，与△P/L成反比，柱塞的速度μ_0随τ_c的增大而减小。

The numerical simution results show that there is slug flow in the plunger-cylinder of the annulus pipe,because of the existence of Casson yield stress.

数值研究结果表明，由于Casson屈服应力的作用，轴向同心环空内存在柱塞流动，柱塞的大小与Casson屈服应力成正比，与压力梯度成反比。

Combining the constitutive equation of Casson fluid with the force-balance relation and the energy equations of non-Newtonian fluid, the velocity and temperature profiles for pipe flow of Casson fluid are obtained.

结合Casson流体的本构方程、力平衡关系式及非牛顿流体能量方程，得出了Casson流体管流速度分布及温度分布。

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。

Plumbers caulk jo in ts in pipe with lead, str in g or a caulk in g compound

管子工用铅、绳子或专用填隙材料使管子的接头不漏水。

Plumbers caulk joints in pipe with lead , string or a caulking compound.

水管工用铅、绳子或专用填隙材料使管子的接头不漏水。

Preset sounds including Piano 1-4, Honky Tonk Piano, Zimbalon, Synth-sound, Harpsichord 1-2, Celesta 1-2, Marimba, Harp 1-3, Koto 1-2, Taisho Koto, Banjo, Mandolin, Guitar 1-3, Electric Guitar 1-5, Electric Bass, Pipe Organ 1-5, Accordion, Bagpipe, Oboe, Clarinet, Flute, Shakuhachi, Wa-wa, Horn, Flugel Horn, Trumpet, Brass Ensemble, String Ensemble, Violin, Cello, and Double Bass.

49个预设的声音，包括钢琴1-4 ， honky唱片钢琴， zimbalon ，合成声音，古1-2 ， celesta 1-2 ，是Marimba ，竖琴1-3 ，江东1-2 ，大正琴，一把班究琴，曼陀林，吉他1 -3 ，电吉他1-5 ，电贝司，管风琴1-5 ，手风琴，风笛，双簧管，单簧管，长笛，尺八，华娃，圆号， flugel圆号，小号，铜管合奏，弦乐合奏，小提琴，大提琴，和低音提琴。

I went through andinian, jazz, ragtime, bluegrass, folk and Celt music, in parallel to classic pipe organ and piano learning.

我经过了 andinian ，爵士乐，拼合旋律，莓系属的牧草，人们和塞尔特人音乐，同时地对第一流的管器官和钢琴学问。

The conclusion is that inductive electromotive force, gotten from sensor with the distribution regularities of weighting function, is proportional to the average flow velocity in pipe and is not relevant to the distribution of flow velocity when flow velocity is non-central symmetry with the central axis.

得出按权重函数分布规律的传感器，在流速非中心轴对称分布时，感应电势仅与平均流速呈正比，而与流速分布无关的结论，从而从原理上解决电磁流量计了高精度测量的问题。

Usage: The centralizer makes the casing pipe at the center of the well.

用途：扶正套管使套管在井眼内居中，使水泥环均匀，提高固井质量。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了