It is usually expressed by the decibels which is the straight beam probe tested the second time subtracting from the first bottom surface echo amplitude.
通常用纵波直探头测试的第几次与第一次底面回波幅度所差的分贝数表示。
Such surfaces reflect most of the bats' echolocation energy away from it, but some energy hits the surface perpendicularly, sending an echo back directly beneath the bat.
这样的平面反射了大部分蝙蝠的声波，但是有一部分能量垂直撞击到表面上，声波回传至蝙蝠。
Hotel lobby entrance even corridor area top surface is a circular arc shape, and the lobby reception desk top arc surface of the hand in photograph echo, gourd shape, take money.
酒店大堂入口连廊区顶面呈圆弧形，与大堂接待台顶面圆弧交相呼应，形似葫芦，取纳财之意。
The inventive diagnostic apparatus is adapted for simultaneous acquisition of ultrasonic echo signals and surface enhanced Raman spectroscopic signals.
本发明的诊断设备适于同时采集超声回波信号和表面增强拉曼光谱 信号。
It is difficult to theoretically calculate the laser scattering echo energy from rough surface of whole dimension target for complex environment in actual application.
由于实际环境的复杂性，理论计算大尺寸复杂目标粗糙表面的激光散射回波能量影响一直十分困难。
Ultrasonic encounter impurities or boundary surface will produce significant reflection form reflex into echo, encounter moving objects can produce doppler effect.
超声波碰到杂质或分界面会产生显著反射形成反射成回波，碰到活动物体能产生多普勒效应。
To suppress ionospheric clutter in the echo signal of high frequency surface wave radar (HFSWR), a method to suppress clutter based on time-frequency analysis and eigenvalue decomposition is proposed.
针对高频地波雷达回波信号中的电离层杂波，提出了利用时频分析与特征值分解抑制杂波的方法。
In both groups, the stenosis extent of carotid artery, the site with the plaque, the conditions of the plaque surface and the echo inside it were evaluated.
观察两组受检者颈动脉管腔狭窄程度、斑块存在部位和斑块内回声情况。
Strong echo produces outflow near the surface.
强回波区的降水会在近地面产生出流。
Each encounters a reflective surface, the echo on the oscilloscope screen displayed the impedance difference between the two interfaces also determine the level of echo amplitude.
每遇到一个反射面时，回声在示波器的屏幕上显示出来，而两个界面的阻抗差值也决定了回声的振幅的高低。
The influence of different incident Angle, different fractal dimension and shadowing effect on the Doppler spectra of the echo from the fractal sea surface is discussed in detail.
详细讨论了不同入射角和不同分维及遮蔽效应对分形海面散射回波多普勒谱的影响。
The measuring results in field show that the impact-echo method is effective in measuring the depth of surface-opening crack.
现场测试表明，该方法对开口裂缝深度的测试是相当有效的。
The higher-frequency sounds are of little use for seismic imaging because they dissipate in the earth, contributing little to images based on the signals that echo up to the surface.
此外，较高频率的声音是很少用于地震成像方面的，因为该高频声音的能量会消耗在土里，导致其返至地面的信号对于成像基本没有作用了。
Echo band consisting of convective clouds has different echo structure in different evolution stages. Water surface and mountains have an effect on it's evolution.
对流云回波带在初生、成熟和消散三个不同的演变阶段结构特征不同，下垫面对回波带的演变有一定的影响。
Based on statistical facts about heavy radar echo and mesoscale surface system, the relationship between digitized radar echo developments and meso...
根据暴雨雷达回波和地面中尺度系统的统计事实，分析了数字化雷达回波的动态运动与地面中尺度系统活动的关系。
The method of imaging the submarine sediment layers' echo data is to study the geologic structure with the information simulated by a profiler and received by hydrophone streamers at the sea surface.
海底地层回波数据的成像处理是依据地层剖面仪在海面激发以及水听器接收到的海底地层声纳回波信息来研究海底地层沉积结构的一种方法。
Based on statistical facts about heavy radar echo and mesoscale surface system, the relationship between digitized radar echo developments and mesoscale surface system and that between digitized...
根据暴雨雷达回波和地面中尺度系统的统计事实，分析了数字化雷达回波的动态运动与地面中尺度系统活动的关系。
Based on statistical facts about heavy radar echo and mesoscale surface system, the relationship between digitized radar echo developments and mesoscale surface system and that between digitized...
根据暴雨雷达回波和地面中尺度系统的统计事实，分析了数字化雷达回波的动态运动与地面中尺度系统活动的关系。
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