An instrument for measuring ultrasonic attenuation by means of comparing the ultrasonic pulse echo with a calibrated exponential decay wave-form is described.
本装置用超声脉冲回波与定标指数波形比较的方法测量超声衰减。
This paper analyses the sound decay in an acoustically treated rectangular space from the view point of wave acoustics. and a new method of calculating complex eigenvalue is given.
本文从波动声学观点出发，分析了矩形水池中声能的衰变，给出了一种解算复本征值的新方法。
The blasting vibration of creep mass slope of Longtan hydropower station is observed, interpreted and analyzed. The experiential formula of decay for the blasting earthquake wave is obtained.
对龙滩水电站蠕变体边坡的爆破振动进行观测、分析和处理，得到了爆破地震波衰减经验公式。
The exponent decay of solution of wave equation with boundary memory is obtained by the energy method.
本文利用能量扰动法得到具边界记忆项波动方程初边值问题解的指数衰减性。
The two measured wave data was once a wave generation stage, and another time a decay stage.
这二次实测，一次为波浪成长阶段，而另一次为波浪衰减阶段。
In theory, the influence of the exponential DC component on the fundamental wave component with random decay time constant can be completely eliminated with the algorithm.
理论上新算法可以消除任意衰减时间常数的直流分量对所求各次谐波分量的影响。
Model verifications are given through comparisons between the calculated and the measured bed mud mass transport velocities as well as the rate of decay of water wave heights.
模型验证是通过计算水波波高衰减率和底床软泥体输移速度，并与有关的实验测量数据进行比较。
Model verifications are given through comparisons between the calculated and the measured bed mud mass transport velocities as well as the rate of decay of surface wave heights.
模型验证是通过计算水波波高衰减率和底床软泥体输移速度，并与有关的实验测量数据进行比较。
This paper presents a method of characteristics to calculate the structure of the detonation wave in condensed explosive by the decay shock curve data obtained in the aquarium test.
提出了一种利用爆轰波垂直入射时水中冲击波的衰减曲线计算凝聚炸药爆轰波剖面的特征线方法。
By using the perturbed-energy method, the exponential decay of the solution is obtained for the nonlinear wave equations with time-dependent coefficients and dissipative boundary condition.
利用能量法证明了具耗散边界条件和时间依赖系数的非线性波方程的能量指数衰减性。
Wave amplitude decay in different ways by downward compressive wave and upward wave, the upward wave decay slower than the downward wave.
下行压缩波与上行波衰减规律不同，其中上行拉力波比下行波衰减快；上行压缩波比下行波衰减慢。
The blasting vibration of an underground chamber is observed, analyzed and interpreted. The experience formula of decay for the blasting earthquake wave is obtained.
对某水电站地下洞室爆破振动进行观测、分析和处理，得到了爆破地震波传播衰减经验公式。
Downward wave amplitude decay in negative exponential function, but the upward wave amplitude is not the case.
下行波的衰减规律符合指数衰减，但上升波的衰减并不符合这一规律。
By using one-dimension FDTD method we simulates the decay of double exponential pulse through the soil media, and its refractive time-domain wave shape is discussed in detail.
用一维FDTD方法模拟了双指数脉冲在单层岩土介质中的衰减，并对电磁波在岩土层中的穿透进行了详细的讨论。
The decay effects of the blasting seismic wave are investigated with the frequency of seismic loading and parameters of structural faults.
采用数值计算的方法，分析了爆炸地震波频率与断裂构造参数对衰减的影响。
For the same mist density, the decay ratio of the shock wave increases with the decrease in the water mist diameter.
相同水雾密度时，水雾的雾滴直径越小，冲击波的衰减率越大。
The results indicate that the decay coefficient of the peak value of blast wave with the distance will be reduced as the hole depth (charge length) is increased.
计算表明，炮孔深度(装药长度)增大，爆炸应力波峰值随距离的衰减指数减小。
The conditions of wave accessibility and parameter decay instability are used to analyse the density limit in LHCD.
用低杂波的可近性条件、参量不稳定性条件和功率耦合谱分析了低杂波电流驱动（LHCD）。
When a thin plate is heated by a beam of modulated continuous laser, a temperature wave generates and propagates along the plate with amplitude decay and phase delay.
通过连续激光调制对薄板试样进行局部周期加热，采用红外扫描测温技术记录动态温度分布。
When a thin plate is heated by a beam of modulated continuous laser, a temperature wave generates and propagates along the plate with amplitude decay and phase delay.
通过连续激光调制对薄板试样进行局部周期加热，采用红外扫描测温技术记录动态温度分布。
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