sound attenuation

Tension of abdominal muscle, epigastrium tenderness, rebounding pain, and gurgling sound attenuation or disappearance.

腹肌紧张、上腹部压痛、反跳痛、肠鸣音减弱或消失。

Lateral Attenuation of Aircraft Sound Levels Over an Acoustically Hard Water Surface

在声学上硬水表面上方飞机声音强度的侧向衰减

Results The values of calcaneal broadband ultrasound attenuation ( BUA), speed of sound ( SOS) and stiffness ( STI) in altitude group were significantly lower than those in plain group at any age ( P < 0.01).

结果进驻高原地区官兵跟骨超声振幅衰减（BUA）、超声声速（SOS）和刚度（STI）各年龄段均较返回平原组显著降低（P<0.01）。

Conclusion Using the technique of ultrasound diagnosis ( USD) to measure the bone density, BUA ( Broadband Ultrasonic Attenuation) is an im-portant statistic data, SOS ( Speed of Sound) is of no characteristic importance.

结论用超声诊断技术（USD）测骨密度值，声量减弱（BUA）值是具有统计意义的重要参考值，声速（KE）值不具备此特点。

A brief review is given in this paper for sound attenuation in turbid water.

对混浊水声衰减作了简要的综述.

Study and Application of Active Sound Attenuation to Exhaust Noise from Engines

发动机排气噪声有源控制技术的研究与应用

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。