1) low frequency earth sound
低频地声
1.
As indicated by observed results,prior to the occurrence of near field earthquake,low frequency earth sound becomes exceptional intensive in information.
阐述大地震前低频地声的波形和频谱的特征。
2) all bottom,low-frequency sound
低频声<声>
3) low-frequency noise
低频噪声
1.
Impact of indoor virescence on annoyance of indoor low-frequency noise;
室内绿化装饰对低频噪声烦恼度的影响
2.
Theoretical analysis of low-frequency noise radiated from bridge vibrations;
桥梁振动辐射低频噪声评估方法研究
3.
The investigation of relations between low-frequency noise subjective sensation and spectrum characteristics
低频噪声主观感知与频谱特征关系研究
4) low frequency absorption
低频吸声
5) Low-frequency sound wave
低频声波
1.
This paper puts forward a method based on online programmable analog device ispPAC10 s deferential amplification and the low-pass filter circuit for realizing the collection of the low-frequency sound wave signal.
提出了基于在线可编程模拟器件ispPAC10差动放大及低通滤波电路来完成低频声波信号的采集。
2.
The low-frequency sound wave is received in the laboratory.
为研究油井管线的声传输过程,测量井底动态参数,根据实际情况设计了一种结构特殊的低频声波换能器。
6) low frequency ultrasound
低频超声
1.
Degradation of azo-dye Acid Red B in aqueous solution by cast iron combined with low frequency ultrasound;
低频超声/内电解法联用处理酸性红B废水
2.
Effects of low frequency ultrasound treatment on the expression of tumor necrosis factor-α in C6 glioma cells;
低频超声对C6胶质瘤细胞TNF-α表达的影响
3.
Objective To investigate the effect of low frequency ultrasound at 1MHz with different power and illumination time on the blood-brain barrier (BBB)and the cortic neurons of rats to seek the optimum sonication condition to open BBB.
目的探讨1MHz低频超声在不同功率、不同照射时间对大鼠脑细胞及血脑屏障的影响,寻求开放血脑屏障的最佳条件。
补充资料：地声
| 地声 earthquake sound 地震发生时，一小部分地震波能量传入空气变成声波而形成的声音。在基岩露出地表和表土层很薄的靠山地区，容易听到地声。听到地声的时间一般在感到地面振动之前，也有的在感到地面振动之后。文献中记载人耳听到的地声，有的似雷声、炮声、撕布声，有的似拖拉机声、风声等。仪器记录的地声大多出现在震前数分钟至数小时内 。 实验表明，在应力达到岩石破裂强度的一半时 ， 声发射信号显著增加，当微破裂进一步发展时，声发射频率由高频向低频变化，因而有可能被仪器和人耳接收。由于地声多在临震前出现，有可能对临震预报和自救有意义。 |
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条