首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   5篇
  免费   0篇
物理学   5篇
  1985年   2篇
  1983年   2篇
  1979年   1篇
排序方式: 共有5条查询结果,搜索用时 0 毫秒
1
1.
本文叙述了声压级为168dB的宽频带噪声对家兔内脏器官损伤的特征。实验表明,家兔内脏的损伤部位与动物所处的体位有关。自由体位和俯卧位动物,主要损伤部位是向外环境开放的肺,其次是空腔脏器胃和肠管。仰卧位动物除肺脏受损外,心脏的损伤非常严重,靠近腹壁的肠管,胃体部及肝脏也受损明显。这些关系表明,高声强噪声对内脏的致伤主要是由于声波的机械效应。  相似文献   
2.
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   
3.
近代高速喷气飞机喷口附近的噪声级高达155分贝.由于在整个飞行过程中飞机尾部处在强噪声环境中,薄板结构因声致振动而产生声疲劳和断裂。我们用气流扬声器直接耦合到行波管,在测试段产生165—170分贝的无规噪声场。对 Ly_(12)-CZ-δ_(0.8),Ly_(12)-CZ-δ_(1.0)和RIT-0.6三种薄板进行了实验研究:观察了裂纹出现和扩展的全过程,比较了不同结构的声疲劳特性,并由实验初步归纳出表述0.8毫米和1.0毫米铝合金板和0.6毫米不锈钢板的噪声场声压级和断裂时间(L_p-t)的关系。  相似文献   
4.
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   
5.
本文叙述了声压级为165—173dB的宽频带噪声场对豚鼠的生理效应。求得了在不同声压级下豚鼠致死的时间。实验表明,若声级增加3dB,豚鼠致死时间减半,并且它的噪声的致死剂量是一个常数,约为33J/mm~2。  相似文献   
1
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号