查询词典 pipe-rack

Heng Bo supplies seamless pipe, senior market analyst believes that the steel industry in Yunnan has been warmer, but there is still the release of excessive production capacity and inventory pressure digestion social problems.

恒博物资的资深无缝管市场分析师认为，云南钢铁行业已经回暖，但仍存在产能释放过快和消化社会库存压力大的问题。

I offered carbon steel pipe. Somebody need it?

我是卖钢管管件的，有需要的朋友吗？

The carload is the important element to calculate the pipe stress.

在这种情况下，原有地下管道安全成为必须考虑的问题。

And thereupon he sat down across the brandy cask, and began to fill a pipe.

说着，他就坐到了白兰地酒桶上，开始装烟斗。

With the exploration of the adhesive work between fluid and pipe-wall, the drag reduction mechanism for the pope flow of Casson fluid is brought to light.

分析了流体与固体管壁之间的粘附功，揭示了卡森流体管内流动时的减阻机理，认为流体在流动过程中滑移的产生是减阻的本质。

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。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。