查询词典 specific heat

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。

Third, the specific heat of some materials is far form what we expect in classical statistical mechanics(especially for the energy of oscillation of the electromagnetic field in a vacuum).

此外，人们发现，所有的物质粒子都可以在适当的条件下显示出波的性质。

A new method of measuring density of matter is suggested. The volumes of infusible matter, fusible matter, hydrophilic matter, and solid with small granular are measured by using determinator of ratio of specific heat of gas.

提出了一种测量物质密度的新方法，即利用气体比热容比测定仪，既可测量不溶性物质的体积，又可测量可溶性物质的体积，还可测量吸水性物质的体积，特别是可以测量小粒状固体的体积。

In first-order transition, the dielectric constant becomes infinite at T〓 Our model has a good agreement with the experimental results on the polarization, dielectric, specific heat and high-field properties.

在一级相变中，介电常数在T〓处是发散的。

The boiling point,thermal conductivity,specific heat and viscosity were measured respectively by ebulliometer,transient hot-wire method,comparison method and rotation viscometer.

以氧化铝为纳米粒子、丙二醇和水为基础液体制备了氧化铝有机纳米流体，分别测量了它的沸点、热导率、比热容和黏度。

Starting from this thermo dynamic potential the specific heat of the electron gas at low temperature was calculated.

此外，从导出的热力学势出发计算了二维电子气体在低温下的比热容。

The ratio of specific heat has the most effect followed by emissivity of radiative object and noises.

其中烟气的比热比的影响最大，其次是辐射源的发射率和环境噪声。

Application of energy conservation principle and specific heat Table ; 4.1 Basic process of ideal gas

热力学第一定律及比热表的应用； 4.1 理想气体的基本热力过程

The experience formula of enthalpy and apparent specific heat of foods are presented.

给出食品热焓和比热容的经验计算公式。

Thermal stress calculation in ice cover is a nonlinear problem, this includes edgeconditions nonlinearity, ice specific heat and conductivity nonlinearity, and ice elasticmodulus and linear thermal expansivity nonlinearity.

冰层温度应力问题是非线性问题，包括边界非线性、冰的比热C和导热系数K的非线性、冰弹性模量和热膨胀系数的非线性等。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。