1) Ultrasonic velocity and attenuation
超声声速与衰减
2) Ultrasonic attenuation
超声衰减
1.
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
2.
Ultrasonic attenuation coefficient of the spray-atomized and co-deposited 6061Al/SiCp composite;
用超声衰减法研究喷射沉积6061Al/SiCp复合材料的阻尼性能
3.
Ultrasonic attenuation technique is used to investigate a method to measure mass concentration of paper fibers in dilute pulp suspensions.
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。
3) Ultrasonic attenuation
超声波衰减
1.
Based on analyzing the theoretical model of ultrasonic attenuation, the formula was integrated into the ultrasonic attenuation model, and the relation of ultrasonic attenuation to pulp density and particle size was derived.
在分析超声衰减基本理论模型的基础上,将不同粒径的筛下累积含量集成到超声波衰减模型中,推导出超声波衰减与矿浆浓度、粒度之间的关系模型。
2.
A formula is proposed for calculating the sand content of different size in the case of matching particle size of sand,thus obtaining the correlation between ultrasonic attenuation and density of solid particles in the pulp,as well as particle size.
提出了在矿砂粒径尺寸级配情况下的不同粒径时的矿砂含量的公式,并由此得到了超声波衰减与矿浆中固体颗粒浓度、粒度之间的关系。
4) ultrasonic attenuation spectrum
超声衰减谱
1.
An ultrasonic path length-variation device was used to measure the pulsed ultrasonic attenuation spectrum of 2% nano-ATO dispersions at 25 ℃,and the McClements theoretical model coupled with the BLBL theoretical model were selected to describe simultaneously the ultrasonic attenuation spectrum of nano-ATO particles in dispersion.
通过发射脉冲超声波并利用变声程方法测量25℃时2%(体积分数)的纳米ATO-H2O分散液的超声衰减谱;选取McClements理论模型叠加BLBL理论模型共同描述纳米ATO颗粒分散液中的超声衰减现象;采用最优正则优化反演算法反演得到纳米ATO颗粒的粒度分布以及平均粒径。
6) subsonic and sapersonic velocities
亚声速与超声速
补充资料：超声衰减（ultrasonicattenuation）
超声衰减（ultrasonicattenuation）
BCS理论给出超导态和正常态两相超声衰减系数αs和αn之比为：
αs/αn=2[1 exp(Δ(T)/kBT)]-1
由此实验上可测量能隙Δ，并对铅、铝、锡等测出的Δ值与其他方法测得的结果基本相符，比值与温度T变化的实验曲线也与理论公式相符，也说明BCS理论对这些超导材料是正确的。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条