Newton had discovered the isothermal velocity of sound in air.
牛顿发现了在空气中恒温声音的速度。
According to certain research, the spread velocity of sound waves has nothing to do with the speed of the ripples.
研究表明，声波在同一介质中的传播速度和波源的速度无关。
Objective: Study the influence of parameters such as attenuation coefficient, velocity of sound, and temperature of medium on focusing sound field.
前言：目的：研究声衰减系数、声速、温度等媒质参数对声聚焦的影响。
The experiment shows: the change of the velocity of sound through normal density alit is regular and directly proportional to the strength of alit;
结果表明：在正常密度水泥石实验中一般声速反应较规则，基本与强度正相关；
A new method of measuring the velocity of sound in the atmosphere is proposed, which USES fixed journey system, comparing to that used varied journey system before.
提出用固定行程系统测量空气中声速的新方法，与以往所用的变化行程系统进行比较。
If you go much faster, the center of lift moves back on the wing, pushing the nose down and increasing velocity, until you soon approach the speed of sound.
如果飞机飞的太快的话，升力的重心就会从机翼转移到前半部机身上，飞机就会下降，速度会接近音速。
However, the flight still managed to return 139 seconds of aerodynamic data at a velocity between 17 and 22 times the speed of sound, Darpa said.
然而，Darpa表示，在以17到22倍音速飞行的状态下，飞机还是回传了139秒的空气动力学数据。
By the time he passed four thousand feet he had reached terminal velocity, the wind was a solid beating wall of sound against which he could move no faster.
他穿越四千英尺的高度时，已经达到极速，呼啸着的海风就像一堵坚实的墙，拦在前面，使他无法以更快的速度前进。
In this paper, the principle and primary results of measure ultrasonic sound velocity and attenuation coefficient by ultrasonic syntonic method are introduced.
本文介绍利用超声共振法测量声速和声衰减系数的原理及自来水和乙醇的测量结果。
The equation of displacement wave and sound pressure wave in the sound velocity experiment are derived. And their relation is analyzed.
推导了声速测定实验中合成声场的位移波动方程、声压波动方程以及两者之间的关系。
The responding signal of the receiving transducer under inspiring by the input supersonic and its reflection wave in experiment of sound velocity measurement is analyzed.
对声速测定(超声)实验中接收换能器在入射波和反射波激励下，换能器的响应信号进行了分析。
As an example, the distribution of the detonation pressure, density, particle and sound velocity along the detonation profile are given for TNT.
以TNT为例进行了计算，给出了其爆轰波内压力、密度、流速和声速等参数的分布。
The change of sound velocity with pressure, dryness degree, void-fraction, and phase-transition coefficient are analyzed. Some important conclusions are derived.
分析了两相流体中音速随压力、干度、汽隙率、相变系数等的变化关系，并从中得出了一些重要的结论。
The results show that sound velocity and sound attenuation is correlated with types of sediment.
结果表明：实验室和现场所得的沉积物声速、声衰减与沉积物的类型密切相关。
Some problems in the traditional experiment of measuring sound velocity by using the resonant pipe device are analyzed.
分析了传统的用共鸣管测量声速实验中存在的问题，提出了两种减小误差的新的改进方法。
In the hydrographic practice, the real depth may be more than the depth of sound velocity profile.
在实施声速剖面测量时，由于某些原因可能存在实际水深大于声速剖面深度的情况。
The accuracy of depth reduction has been improving with the continuous accumulation of hydrographic data and widely application of sound velocity profiler.
海域水文资料的不断丰富和声速仪的广泛使用，推动了水深声速改正精度的提高。
A frequency domain characterization method using low frequency ultrasound is put forward to estimate parameters of ultra thin elastic layers, such as: the sound velocity, thickness and density.
本文提出一种定量无损估计超薄弹性层声速、厚度和密度参数的低频超声波频域定征方法。
General properties of galactic shock wave and the influence of the variation of effective sound velocity on the solution of galactic shock wave are discussed also.
本文还讨论了星系激波的一般性质，以及等效声速的变化对星系激波解的影响。
The phased-array Doppler log has several advantages, such as small size of array and no need of compensation for sound velocity.
相控阵多普勒计程仪具有基阵体积小，且无需迸行声速补偿等优点。
The influence of the size of sound lens and the sound velocity in sound lens material and crude oil and rock stratum on the sphere of action is studied.
分析了声透镜尺寸及材料中的声速、原油及岩层中的声速对其传播距离的影响。
The experiment error of sound velocity measuring is very small with lissajous figures.
用李萨如图形法测量声速误差较小。
With reduction of engine load, sound velocity of DME decreases.
随着负荷的下降，DME的音速下降，且下降的速率远比柴油的大。
Controlling the volume velocity of vibration plate has previously been shown to be a good strategy to reduce its overall sound radiation and vibration energy.
控制振动板结构的体积速度是降低结构总声功率和振动能量的一种有效策略。
Measuring sound velocity is an important physical experiment. It is possible to know the acoustical characteristics of measured medium by measuring sound velocity.
测量声速是大学物理实验中一个比较重要的实验，通过对声速的测量可以了解被测介质的声学特性。
For exploring the direction of acoustical emission sources prior to earthquakes, assuming that the sound velocity is only dependent on depth, a formula of sound source direction can be derived.
为探索震前声发射的方向与地震的关系，假定声速仅与深度有关，在这种条件下得到的方向公式应该与恒速条件下得到的方向公式一致。
If you go much faster, the center of lift moves back on the wing, pushing the nose down and increasing velocity, until you soon approach the speed of sound.
如果飞得太快的话，升力的中心会向机翼后部移动，使飞机的机头朝下，导致飞行速度增加，直到飞机接近音速。
One of them is the sound standing wave resonance of fluid in cavity, the frequencies of which are invariable as velocity of flow is increasing.
经过分析，发现突出试验段壁上的流线型腔与突出的矩形腔在气流中被激振荡相似，存在着其频率与流速无关的腔中液体声共振谱峰；
It treats the weighted average sound velocity in different mediums as the average sound velocity in the structure, thus the natural frequency of the structure is calculated.
以声波在各层介质中传播时波速的加权平均值作为构筑物的平均声波波速，计算出结构自振频率。
It treats the weighted average sound velocity in different mediums as the average sound velocity in the structure, thus the natural frequency of the structure is calculated.
以声波在各层介质中传播时波速的加权平均值作为构筑物的平均声波波速，计算出结构自振频率。
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