ultrasonic attenuation

Objective: To study the diagnostic role of broadband ultrasonic attenuation ( BUA) in measurement of bone mineral density. Determination of Fatty Liver Ultrasonic Attenuation

目的：探讨跟骨宽带超声衰减诊断骨质疏松的临床价值。脂肪肝超声衰减系数测定

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Vivo Determination of Placenta Ultrasonic Attenuation Coefficients in Normal Pregnant Women

38例正常孕妇的胎盘超声衰减系数

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Solidification degree of PETN composite explosive would affect ultrasonic attenuation.

介绍泰安混合炸药固化程度对超声波衰减的影响.

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Ultrasonic Velocity and Attenuation of Tightening Screw in Nuclear Power Plant

核电紧固螺栓的超声速度和衰减

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Pulse-echo based ultrasonic attenuation model for porosity test of carbon fiber composites

碳纤维复合材料孔隙率的脉冲反射法超声衰减测试模型

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The results indicate that the temperature dependence of ultrasonic attenuation in liquid hydrogen is mainly determined by volume viscosity effect.

实验结果表明，液氢的超声衰减的温度依赖特性主要取决于体积粘滞效应。

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Research of Measuring the Ultrasonic Attenuation Coefficients and Texture Parameters of the Diseased Liver

肝脏病变的声衰减系数与纹理参数的测定

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Ultrasonic attenuation in normal and abnormal human tissues

超声在人的正常与病变组织中的衰减

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Then a theoretical relationship between ultrasonic velocity and attenuation of rock and axial stress based on an effective crack density parameters are given.

在此基础上用裂纹的体积变形建立岩石在单轴加载过程中的等效裂纹模型，用该等效模型建立了岩石在单轴加载全过程中超声波速及衰减系数随应力变化的理论关系。

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In addition, TWM analysis results also proved that acoustic particle size based on the principle of ultrasonic attenuation could accurately describe the particle size distribution of nanometer calcium carbonate suspension.

另外，样品透射电镜分析结果表明，基于声衰减原理的声波粒度仪较好地反映了纳米级碳酸钙悬浊液中颗粒粒度分布情况。

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Evaluating the density of cancellous bone using quantitative ultrasound, it's a theory developed for more than ten years in the field of Ultrasonic Diagnosis Technic, broadband ultrasound attenuation ( BUA) and speed of sound ( SOS) are two pivotal parameters of the QUS diagnosis.

在超声诊断技术领域，定量超声骨密度检测理论已发展了十余年，宽带超声衰减（BUA）和超声声速（SOS）是用定量超声（QUS）进行骨质疏松症诊断的最重要的两项参数。

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The theory of ultrasonic attenuation in superionic glasses

超离子玻璃中的超声吸收理论

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The broadband ultrasonic attenuation ( BUA) of proximal femurs, fat-free dry weight and ash weight of the femur of the rat model were measured by quantitative ultrasound.

同时用定量超声检测大鼠股骨近端超声振幅衰减（BUA）及大鼠股骨骨干重和骨灰重。

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Because of ultrasonic attenuation in organism is proportional to frequency, 2 MHz ultrasonic distance and receiving sensitivity.

超声波在生物体中的衰减与频率成正比, 使用2MHz超声换能器由于衰减大致使穿透深度小、接收灵敏度低、仪器综合灵敏度难以提高.

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Ultrasonic attenuation capacity of cellular Al alloy foam were studied.

研究了闭孔泡沫铝合金孔结构参数对其超声衰减性能的影响.

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This method overcomes the difficult and unrealizable experiment conditions that are used to measure the absolute attenuation coefficient and impels the technique of ultrasonic characterization to be more closed to the engineering requirements and more practical.

该方法克服了绝对衰减系数测定法对实验条件要求极为苛刻、难以实现的不足，使得超声表征技术更接近工程条件、更具实用价值。

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