acoustic impedance

Opposition to the flow of sound through a surface; acoustic resistance is the real component of acoustic impedance and acoustic reactance is the imaginary component.

声音在通过一个表面时受到的阻力；声阻是声阻抗的实部，声抗是声阻抗的虚部。

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We followed up 25 subjects in 1-2 weeks, the results of pure-tone audiometric testing and acoustic impedance audiometry of 24 subjects were normal, and had no significant differences to those examined before administration.

给药后1-2周，共随访到25例正常受试者，其中24例复查纯音测听和声阻抗测试都在正常范围，与受试前纯音测听结果相较未见明显差异。

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The product of the velocity and density of a rock is termed in the acoustic impedance.

岩石的波速和密度之乘积称为声波阴抗.

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As poststack acoustic impedance inversion use the seismic data of full angle multiple stack, it weakens the reflection sensitivity of reservoir character. AVO analysis and inversion provides various lithology parameters, but it can be easily affected by many kinds of noise.

叠后波阻抗反演使用全角度叠加的地震资料，削弱了反映储层特征的敏感性；叠前AVO分析和反演能够提供丰富的岩性参数，但受噪音的影响较大。

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Negative coefficients occur where there is a decrease in acoustic impedance across the reflecting interface.

当反射界面上下两侧的声波组抗降低时,反射系数就会出现负值.

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All children underwent routine otoscopic examinations of ear, nose and throat, and were also examined using the Madsen acoustic impedance audiometer.

均进行耳科常规及声阻抗检查，发现腭裂患儿中耳静态压力与声顺值，声镫骨肌反射引出率都低于正常儿童。

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On the basis of acoustic impedance inversion, sand percentage section and sandstone porosity section are made using time average equation and interpolation formula. These two sections are significant to the extrapolation of logging data under ideal condition.

在波阻抗反演的基础上，利用时间平均方程和内插公式做了砂岩百分含量剖面和孔隙度剖面，这两种剖面在比较理想的条件下，对测井信息的外推有重要参考意义。

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A New Surface Acoustic Wave Impedance Sensor and Its Application in Liquid System

一种新型的表面声波阻抗传感器及其在液相体系中的应用

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Methods Pure tone audiometry, Gelle's test, acoustic impedance radiological examination were performed in the 19 patients ( 38 ears).

方法对19例（38耳）LVAS患者进行了纯音听阈测试、盖莱氏试验、声导抗测试及颞骨高分辨CT检查。

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Methods To check on objective acoustic impedance and subjective pure tone audiometry.

方法对外伤性聋进行客观声导抗测试和主观纯音测试。

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It may match the impedance of acoustic loads in order to increase transducing efficiency.

为提高换能效率,可以采用匹配声阻抗法.

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