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超声空化的电化学检测及混响场空化效应的研究 总被引:2,自引:1,他引:2
本文提出并设计了超声空化的电化学检测法,实现了通过分析样品的电学量变化来检测声空化,通过对混响场空化效应的研究,定性分析解释了混响场中空化饱和现象? ? 相似文献
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Ultrasonic attenuation and velocity were measured for six fresh pig tissues:blood vessel,brain,heart,liver,spleen and kidney by using the pulse insertion method. Frequency dependence of attenuation has been found to be nearly linear,with the power rangingfrom 0.96 to 1.39 over the 1—13 MHz at 37℃. Velocity dispersion has been observed for all of the six tissues and the average value was 0.11—O.38 m/s.MHz for frequency range from 5 to 13 MHz at 37℃. Temperature effect over the 7—37℃ range for brain was also studied.Velocity at 1 MHz wasfound to be of positive temperature coefficient with average value 1.3m/s·℃and attenuation at 1,3,5MHz decreased with increasing temperature. Velocity for six tissues studied was an approximately linear function of their whole protein content.Every unit protein percentage concentration raises velocity by about 2.9m/s at 5 MHz and 37℃. 相似文献
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冯若 《声学学报:英文版》1988,(1)
With the rapid development of ultrasonic application in clinical diagnosis,especially inobstetrics,the problem on the safety has been attracting more and more attention of scientists andpublic.In this review a series of problems concerning exposure parameters,data generalization ofultrasonic bioeffects,recommendations on safety threshold,epidemiological studies on the safety ofultrasonic examination in pregnancy and some phenomena expected urgently to be studied aredicussed and several intelligent guide principles which would be accepted for use of ultrasound inobstetrics will be pointed out. 相似文献