宽带超声衰减(BUA)反映了骨密度疏密程度。
Broadband ultrasound attenuation (BUA) reflects the degree of bone mineral density.
超声衰减可表征聚合物共混物的相容性和相形态结构。
Ultrasonic attenuation can characterize the miscibility and phase morphologies of polymer blends.
结果表明：泡沫铝合金的超声衰减性能决定于其孔结构；
The results show that the ultrasonic attenuation properties are determined by the pore structures of Al alloy foam.
目的：探讨跟骨宽带超声衰减诊断骨质疏松的临床价值。
Objective: To study the diagnostic role of broadband ultrasonic attenuation (BUA) in measurement of bone mineral density.
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。
Ultrasonic attenuation properties of porous and cellular Al alloy foam with spherical pore;
本装置用超声脉冲回波与定标指数波形比较的方法测量超声衰减。
An instrument for measuring ultrasonic attenuation by means of comparing the ultrasonic pulse echo with a calibrated exponential decay wave-form is described.
本文对超声衰减系数和超声声速断层成像的测量过程进行了描述。
This paper describes the measurement procedure of ultrasonic attenuation coefficients and ultrasonic velocity tomography.
结果表明，可以通过超声衰减的？度直接预测复合材料的力学性能。
Therefore, by determining the intensity of ultrasonic damping, the mechanical properties of composite can be predicted directly.
目的探讨超声衰减成像技术(uai)定量评估肝纤维化的可能性。
ObjectiveTo investigate the feasibility of quantitatively assessing hepatic fibrosis by ultrasonic tissue attenuation imaging (UAI).
目的探讨超声衰减双定标定量分析技术是否可获得高重复性的检测结果。
Objective To discuss whether ultrasonic attenuation dual calibration quantitative analysis may acquire highly repeatable checkout results.
本文广泛地收集了有关内耗，力学谱，超声衰减方面的专著及会议文集。
An extensive collection of recommended books and proceedings from numerous conferences on internal friction-mechanical spectroscopy, and ultrasonic attenuation is provided.
试验结果表明，豆乳在凝固超声衰减曲线上有一明显转折点即凝固初始点。
The result showed that there is a turn point on the ultrasonic attenuation curve.
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。
The results indicate that the temperature dependence of ultrasonic attenuation in liquid hydrogen is mainly determined by volume viscosity effect.
目的探讨超声衰减成像技术定量评估肝细胞性肝癌患者肝功能储备的价值。
Objective to investigate the value of quantitative assessment of hepatic fibrosis in predicting hepatic functional reserve of patients with hepatocellular carcinoma (HCC).
研究微波热疗组织超声衰减系数的温度相关性，以期实现肿瘤微波热疗超声无创测温。
The temperature correlation of ultrasound attenuation coefficient in the organization of microwave hyperthermia is researched in order to achieve non-invasive organization temperature.
结果表明：超声衰减系数与频率之间存在线性关系，而且其斜率随孔隙率的增大而增大。
The attenuation coefficient shows approximately linear behaviour with frequency over the frequency range used, and the attenuation slope increases with the void content.
采用超声衰减技术研究了稀释纸浆悬浮液中纸纤维质量浓度的测量方法，讨论了稀释纸浆悬浮液中超声的衰减机理。
Ultrasonic attenuation technique is used to investigate a method to measure mass concentration of paper fibers in dilute pulp suspensions.
本文介绍利用超声共振法测量声速和声衰减系数的原理及自来水和乙醇的测量结果。
In this paper, the principle and primary results of measure ultrasonic sound velocity and attenuation coefficient by ultrasonic syntonic method are introduced.
目的研究凹球面超声换能器的声焦域在高声强和媒质有较大衰减情况下，其形状和几何位置的变化。
Objective the variations of the site and shape of focal region for a concave spherical ultrasound transducer in the case of high sound intensity and stronger attenuation were studied.
研究了带有粘弹性包覆层管道中超声导波扭转模态的频散及其衰减特性。
Dispersion and attenuation characteristics of torsional modes of ultrasonic guided wave in pipe with viscoelastic coating are investigated.
材料对超声波的衰减是影响超声波探伤仪检测能力的主要因素之一。
Attenuation of ultrasonic wave by material is one of main factors influencing detection capability of ultrasonic wave defectoscope.
实验结果表明：超声波在高水基流体介质中的衰减与一定范围的介质浓度存在较好的线性关系。
The results of experiments show that there are obvious linearity relationship between the attenuation of ultrasonic and the concentration of high water based fluid in some ranges.
本文报道了近年来我国在生物组织超声特性——传播速度、衰减、吸收、反射、散射和非线性声参量方面的研究进展情况。
We reported the main progress made in China in recent years of the study of ultrasonic tissue characterization-propagation velocity, attenuation, scattering and nonlinearity parameter, etc.
目的：探索胃肠内容物的声学特性及超声波经过胃肠内容物的衰减规律。
Objective: To research the acoustical quality of gastrointestinal contents and the attenuation criterion of ultrasound passing through gastrointestinal contents.
在高温状态下，超声波探伤实施的关键在于声耦合、声衰减和声路径的控制。
The linchpin of undertaking high temperature ultrasonic testing is the control of the coupling, attenuation and route of the sound.
超声波在岩石中的衰减特征通常用岩石吸收品质因子(Q值)来表征。
The ultrasonic attenuation character in the rock is usually expressed by rock absorbability quality factor (q).
本文提供了一种用于识别这类随机信号的数学统计模型，并介绍了一种时间平均法用来获取超声背散射信号的衰减系数。
In this paper, a mathematical model is used to characterize this random signals, and a time averaging method is used for obtaining the ultrasonic attenuation coefficient.
采用数字手段测取了超声波信号的衰减系数，通过衰减系数可得出含沙量。
By using the digital means, the attenuation coefficient of the ultrasonic signal is measured, through which the sediment content can be obtained.
从理论上建立材料的缺陷模型，并结合声衰减分布图与超声损伤力学原理，就能获得材料的失效模型。
After built the material's defect model in theory, combined the attenuation image and damage mechanics of acoustic, we can get the material's invalidation model.
在分析现有超声波衰减理论模型的基础上，建立了混合粒度分布下超声波的衰减模型。
Based on the analysis of the existing theoretical model of ultrasonic attenuation, the model for ultrasonic attenuation of composite particle size distribution was established.
应用推荐