声速的

At first, numerical simulation are made on the temporal developing gas-phase mixing layer where the convective mach number is in the region of subsonic(0.5) and transonic(0.8). For the temporal problem where Mc is 0.5, researches where the computational field contains different numbers of initial disturbances(so-called n period problem) are made respectively, and vortex's types of evolution in mixing layer including different numbers of initial disturbances are investigated; For the temporal problem where Mc is 0.8, the distinct shock let structure is obtained, and its mechanism is analyzed at the same time.

文中首先对对流马赫数为亚声速(0.5)、跨声速(0.8)的时间发展单气相混合层作了数值研究，对Mc为亚声速单气相时间发展混合层，分别研究了计算域包含不同数目的初始扰动周期问题，考查了不同周期数的混合层中涡的不同演化方式；对Mc为跨声速的单气相时间发展混合层，得到了清晰的小激波结构，同时分析了小激波的形成机理。

The principle of measurements of speed of sound in gaseous phase is discussed and a cylindrical variable-path acoustic interferometer is described.

介绍了干涉法测量气体声速的试验原理和变程干涉声速测量的实验系统，使用本套测量系统测得的气体声速的精度可达5×10-4。

In view of undeterminable parameters andinadaptability to both gas and liquid in existing acoustic velocity models,a new sound velocity model based on PREOS has been established by analysing relationship between pressure,speed of sound and temperature.

针对目前声速模型存在参数难以确定，不能同时适用于气液两种相态等问题，通过分析压力、声速及温度三者的关系，基于PR状态方程开发了声速的新计算模型。

It has also been confirmed by the measurement of ultrasonic sound velocity.

通过对其超声声速的测量，确认了此相变的存在。

In this paper, the author discovers the relationship between air pressure and velocity of sound using ultrasonic sensor in local microenvironment.

本文在局部小环境下，使用超声波传感器测量声速的过程中，发现了气压变化与声速变化之间的变化规律。

Read to you, with the jumping of my front, call out you, Use the legend of my velocity of sound.

读你，用我胸前的跳跃，唤你，用我声速的传奇。

The velocity of sound in water is 4900 ft Per second ,or more than four times its velocity in air

水中的声速成为每秒4900英尺，比空气中的声速大三倍多（直译则为：……是空气中声速的四倍多

The principle of using ultrasonic wave to detect the vermicular graphite rate in vermicular iron is introduced.

介绍了超声波声速测定蠕墨铸铁蠕化率的原理，通过用金相和超声波两种方法对蠕墨铸铁蠕化率进行对比测量，验证了蠕化率与声速的对应关系。

This paper described the principle of plane ultrasonic spreading abroad in the liquid coming into being ultrasonic grating,educed the density and refractive index changing rule basis continuity equation of not-ideal liquid and Lorentz-Lorenz law,expressing the transformation of the index and refractive index satisfaction similar equation of standing wave,and described the relation curve of the standing wave form at a few special times,liquid density and refractive index periodic variety according to the res...

描述了平面超声波在液体里传播形成超声光栅的原理；根据非理想流体对应的连续性方程和Lorentz-Lorenz定律，推导了液体光栅中液体密度与折射率的周期性变化规律，表明液体密度和折射率变化满足相似的驻波方程；根据推导的结果描绘了几个特殊时刻的驻波波形、液体密度、折射率周期性变化之间的关系曲线；进而由折射率周期性变化规律分析了超声驻波自身像的形成原理，并给出了CGS型超声光栅声速仪利用超声驻波自身像测量声速的方法与实验结果。

Mach two equals twice the speed of sound.

二马赫相当于声速的二倍。

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。