次声

Objective To investigate the effect of 8 Hz infrasound on the expression of brain derived neurotrophic factor in the rat hippocampus.

目的研究频率为8 Hz，声压级分别为90，100和130 dB的次声作用对大鼠海马脑源性神经营养因子表达水平的影响。

The songs of cicadas A and B are both sound of rhythmical type consisting of single stridulant group and consecutive stridulant group with the main peak frequency at 6.3 kHz.

蝉A和蝉B的鸣声都是由主峰频率为6.3 kHz的单次声群和连续声群组成的节律声。

The results showed that the main frequencies were at about 6～100Hz and the sound pressure levels were about 80 dB.Infrasonic sound existed notwithstanding the dust remover was at work or not.

结果显示声音的主频在6～100Hz左右，为次声和低频噪声共存，工作场所声压级在80dB左右。

AIM: To observe the effects of infrasound on sperm quality and explore some underlying mechanisms.

目的：观察次声作用对大鼠精子质量的影响，初步探讨次声对雄性生殖系统的作用机制。

It has been important part of manufacturing noise and public noise, so it is significant to survey environment infrasound.

次声已是生产噪声和公共噪声的重要组成部分，因此环境次声测量具有重要的实际意义。

There're few reports about overall measurement of environment infrasound in our country.

我国尚无较全面深入测量环境次声的报道，因此我们率先在国内对部分环境次声进行了有计划的测量。

Using the characteristic of infrasound in a right way can make harm to be benefit. It can be used widely in biomedical engineering, and would make great contribution for human health.

恰当的利用次声的特性，可以转害为利，让次声在生物医学领域得到广泛的应用，为人类的健康做出贡献。

These brain regions are sensitive to infrasound and effects of infrasound can increase expression of GFAP.

这些脑区对次声较为敏感，次声作用可导致GFAP表达增高。

Using the characteristic of infrasound in a right way can make harm to be benefit. It can be used widely in biomedical engineering, and would make great contribution for human health.

恰当的利用次声的特性，可以转害为利，让次声在生物医学领域得到广泛的，为人类的健康做出贡献。

Since the human body and organs in the body can be seen as more focused, more flexible point of vibration whose vibration inherent in the frequency infrasound vibrations, so infrasound have a stronger effect on the human body.

人体和体内器官固有振动频率均在次声震动范围内，次声波对人体有较强的作用效果。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。