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The present study describes the characteristics of visceral injuries of rabbits exposed to a wide-band noise field of 168 dB sound pressure level.The experimental results demonstrated that thesites of the injuries are dependent to a certain extent on the postures of the animals.For animalsin free body posture or in prone posture,the most vulnerable organs are the lungs,which are opento the external environment,and the next are the hollow organs(with empty cavities)such as thestomach and intestines.For animals exposed in supine posture,the heart is usually very seriouslyinjured.Besides,the liver,which is situated near the abdominal wall,will also show some significantinjuries.The characteristics of these visceral injuries reveal that the primary cause of those patho-logical findings is the mechanical effect of the sound waves. 相似文献
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沈 《声学学报:英文版》1983,(2)
Some results from the study of the physiological effects of high level broad-band noise fields(165-173 dB)on guinea-pigs are presented in this paper.The lethal time for guinea-pigs undervarious sound pressure levels was determined.The logarithm of exposure time and the sound pres-sure level had good linear correlation.The experimental results showed that lethal time was decreasedby half if the sound pressure level was increased by 3 dB.These results agreed with the law ofequal energy and showed the death of guinea-pigs depended on the noise-dose,i.e.the noise in-tensity times the exposure duration.The average value of the lethal noise-dose is a constant,about33 J/mm~2. 相似文献
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目的:探索随机振动和正弦振动因素下生成语音在听觉效果上的变化规律。方法:随机振动采用频率范围2-20Hz,加速度为0.3G、0.5G、0.7G(有效值,下同),正弦振动采用频率4、6、8、10、12Hz,加速度为0.3G、0.5G;在安静及信噪比分别为0dB和-6dB三种状态下对随机振动组、正弦振组及对照组3个组的语音材料进行清晰度测试。结果:和对照组相比,随机振动组,清晰度几科没有变化,正弦振动组,0.3G时4Hz、0.5G时6Hz和8Hz作用下语音清晰度有明显降低,检验结果非常显著。研究还发现,清晰度的降低随听音环境的信噪比的降低而变得严重;结论:正弦振动对发音人发音的影响,会使通话效果变差,并且在听音环境恶劣时尤为突出。 相似文献
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