The frequencies used in sonar systems vary from infrasonic to ultrasonic.
声纳所使用的频率从次声到超声不等。
In the first part, an infrasonic pressure chamber system was established.
第一部分为次声压力仓系统的建立及性能检测。
Another haunted and related natural phenomenon is known as frequency infrasonic sound waves.
另一种与闹鬼相关的自然现象是称作次声的低频声波。
Infrasonic observations of open ocean swells in the Pacific: Deciphering the song of the sea.
在太平洋里大洋涌(长浪)次声观测：译解海地歌曲。
The Tunguska event included seismic waves and infrasonic disturbances that were recorded around the world.
通古斯爆炸包含了地震波和次声扰乱，被世界各地记录下来。
A new method about measurement of the precursory infrasonic waves of strong earthquake was introduced.
介绍强地震前兆观测的一种新方法—次声波法。
Results With increase in the times of infrasonic damage, cerebral ultrastructure became more aggravated.
结果随次声作用次数增加，脑超微结构损害愈重；
The equation of infrasonic wave taking into account the gravitational effect in moving media is derived, with multi-layer atmospheric model.
本文推导了计及重力效应运动媒质中的次声波动方程和用速度的散度表示的分层大气模型下的频散方程；
According to the characteristics of infrasonic sound effect on human body, the principle of nonlethal infrasonic weapon for on site control is put forward.
根据次声对人体作用的特点，提出了现场可控非致命次声武器的概念。
Proper structure design of the infrasonic monitoring arrays is an effective means to restrain the environment noise and enhance the target infrasonic signal.
次声监测台阵结构的合理设计是抑制环境噪声及增强目标次声信号的一种有效手段。
Given a certain model of atmosphere, the position of resonant factor of infrasonic waves is figured out, by using the theory of full waves and some certain bound conditions.
对于波在一种给定的大气模式中传播，加上一定的边界条件，用全波解理论，求出了次声波共振因子的位置。
The primary results show that the ultra low-frequency pulses may produce in the process of nucleation of micro-cracks and faults, and transmit to the air as infrasonic sound.
初步结果表明，微破裂的集结和断层的破裂起始会出现超低频脉冲，并透射到空气中形成次声波。
In this paper some typical works are introduced in detail to make a review about the human hearing threshold of infrasonic frequencies in which an identical result has not been got up to now.
直到目前，人类在次声频段的听力阈值仍没有得到一致的结果。本文综述了这方面的工作，并略详细地介绍了几个有代表性的工作。
In this paper some typical works are introduced in detail to make a review about the human hearing threshold of infrasonic frequencies in which an identical result has not been got up to now.
直到目前，人类在次声频段的听力阈值仍没有得到一致的结果。本文综述了这方面的工作，并略详细地介绍了几个有代表性的工作。
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