声波

Combined with mechanical experiment ultrasonic wave testing is performed to investigate the quality and weathering status of rock specimens obtained in double borings situated in cliff of Grand Buddha of Jinyang in Taiyuan.

运用声波测试方法，结合物理力学试验，研究太原晋阳西山大佛陡崖岩体2个水平钻孔中岩石的质量和风化情况。

His cassette player may be out-dated nowadays, but 80's retro is so in right now.

大家可能觉得声波那个卡带录音机的形象有点过时了，然而80年代的复古不正是现在最流行的么？

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。

According to this matrix and the characteristic equation for anisotropic solids, the slowness curves for this material are obtained.

由此矩阵，根据各向异性体的声波特征方程，给出材料在有关截面内的慢度曲线。

Acoustic waves are a primary candidate for supplying the energy necessary to heat the solar chromosphere and corona.

声波是供给太阳色球和日冕加热所需能量的主要候选能源。

The rest escapes as sound waves, mechanical vibrations that heat the chromosphere, the middle layer of the sun's atmosphere

其余部分则以声波即机械振动的形式散逸，它们加热了太阳大气的中间一层，即色球层。

Owing to the fact that the Claro is crystal clear, your iPod's will continue to show its natural color (great if you have personalized your iPod); and if you are in the mood for colorful iPod, you can add on Claro Slims that comes in 2 packs - the Cruiser Pack (Blaze Red, Prince Purple and Blush Pink) and the Chill Pack (Ebony Black, Sonic Blue and Ghost White glow in the dark).

由于这一事实，即， Claro的是非常清楚的，您的iPod的将继续显示其自然的色彩（如果您有个性化您的iPod ）；如果您是在情绪，为丰富多彩的iPod ，您可以添加上， Claro的slims来在二包-巡洋舰包（灌救红，王子紫色和绯红粉红）和冷包（黑漆黑色，声波蓝色和白色的幽灵辉光在黑暗中）。

Those vibrations cause ripples in the cochlea's fluid, which stimulate hair cells.

那些声波在耳蜗内的液体中制造出大量的波纹，从而刺激耳内的毛发细胞。

Sound stimulation impacts on the growth and metabolism of E. coli were significant.

结论］声波刺激对大肠杆菌的生长及代谢具有显著影响。

Firstly, general mechanical displacement and a dispersion equation are derived by solving elastic field equations with continuity boundary condition.

本文推导了双层声波导结构乐甫波传感器的频散方程和质量敏感度。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。