infrasonic

1. 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。
2. Infrasonic acoustic radiation weapons;
   次声辐射武器；
3. 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。
4. 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。
5. GIRAFFES communicate with each other at an infrasonic level that humans cannot hear.
   长颈鹿用人听不见的低频声音相互沟通。
6. AIM: To study the effects of infrasonic sound on the ovary of mouse in ultrastructure.
   目的：研究次声暴露对小鼠卵巢细胞超微结构的影响。
7. 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。
8. 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；
9. Discussion on Application of Infrasonic Wave to Tsunami Disaster Warnings
   次声波在海啸灾害预警中的应用探讨
10. Measurements and Study of the Precursory Infrasonic Waves of Strong Earthquakes from July to September, 2000
    2000年7～9月强地震的前兆次声波测量研究
11. This paper reports the measurements and results of infrasonic waves produced by a large explosion.
    本文叙述一次使用万吨炸药的大爆破在远距离产生次声波的测试方法和结果。
12. The Data Collection System of Infrasonic Signal
    次声信号的数据采集系统
13. On the basis of the introduction of infrasonic conception, this paper analyses constitution principle of infrasonic receiver, and emphatically summarizes CSH-1 capacitances infrasonic receiver designed and made in the light of this principle.
    在介绍次声有关概念的基础上，分析了次声接收器的构成原理，着重概述了根据该原理设计制造的CSH-1型电容式次声接收器。
14. The infrasonic vibration generator is established on the principle or beat frequency. Starting from this principle, we study the frequencies of two pairs of special forks and find that there exists an infrasonic frequency function between the forks.
    次声振荡发生器建立于拍频原理的基础上，按此原理我们研究两对特制音叉的频率，并找出了在这两对音叉间所存在的次声频率函数。
15. In this paper the computation of envelope with Hilbert transform and 1/ 12-octave filtering are discussed. Then a synthetic infrasonic signal generated by a large nuclear explosion is analysed with two methods, and their results are compared.
    在本文中讨论了用希尔伯特变换求信号的包络，及1/12倍频程滤波器，然而用二种方法分析一个合成的核爆炸次声信号，对它们计算的结果进行比较。
16. Effects of warship infrasonic field on hearing in the crewmen and animals
    船舶次声环境对船员和动物听觉功能的影响
17. Wind noise at the surface of the Earth limits the detection of infrasonic waves with periods greater than 10 s.
    地面风产生的扰动噪声影响周期大于10s的次声波的检测。
18. In this paper, the mechanism of infrasonic radiation is studied and mathematical model of infrasonic field is established based on plane piston radiation mechanism.
    本文从平面活塞运动的发声机理出发，研究了次声发生机理，建立了次声场的数学模型；
19. This paper analyzed the advantage and disadvantage of three sound wave focus methods, that is lens focus, curved autofocus, and phased-array focus on the base of draw lessons from supersonic focus technic, consequently preferred and designed the infrasonic phased-array focus system.
    文中在借鉴超声波聚焦技术的基础上，分析了透镜聚焦、曲面自聚焦、相控阵聚焦等三种声波聚焦方法的利与弊，从而选用和设计了次声相控阵聚焦系统。
20. Since the inhomogeneity in the atmosphere, an infrasonic wave consists of different normal modes, of different phase and group velocities.
    由于大气层的不均匀性，次声波分解成不同的简正方式来传播，它们有各自的相速度和群速度。
21. Observation and analysis of infrasonic disturbances
    对次声波扰动的观测与分析
22. At the same time, the wind speed-sound pressure relation curves have been measured and calculated, and the antijamming ability of the array receiving infrasonic signals is obtained.
    同时，还测量和计算了风噪声的速度&声压关系曲线，得到声阵在接收次声信号时的抗干扰能力。
23. The infrasonic radiation equipment, which can adjust the frequency and amplitude of infrasound, is developed.
    并在此基础上，研制出一种频率、幅度均可调的次声发生装置。
24. Infrasonic wave is commonly found in a variety of industry, transportation, nature and living environment.
    次声波普遍存在于工业、交通、自然及生活环境中。
25. In recent decades, the detection of infrasound has been made some progress, and some of excellent infrasonic wave sensors have been developed. However, there are some problems.
    近几十年来，对次声波的检测取得了一定的成就，研制出了一些性能优良的次声波传感器，但也存在一些问题。
26. In addition, infrasonic signal processing software is designed using MATLAB.
    此外，应用MATLAB设计开发了次声信号处理软件，通过简单、直观的界面操作，实现对信号的监测分析。
27. In addition, a new type of infrasonic wave generator has been designed and an infrasonic wave acoustic data acquisition system has been set up.
    此外，还研制了次声波发生器，并搭建了次声波数据采集系统。
28. 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。
29. In China, there are some reports only about changes of blood pressure and pulse caused by infrasound, but the systematic study on cardiovascular infrasonic bioeffects is absent. Therefore, it is important to develop the investigation for theory and praxis.
    我国只有次声作用引起血压和脉搏变化的报道，缺乏次声对心血管生物学效应的系统研究，因此，本研究具有重要理论和现实意义。

adj

1. having frequencies below those of audible sound