Standard test method for measurement of ultrasonic attenuation coefficients of advanced ceramics by pulse - echo contact technique 用脉冲反射接触技术测量高级陶瓷超声衰减系数的标准试验方法
By using a numerical method , the effect of changing in magnetic field upon vibration frequency and coefficient of reduction is presented 最后给出数值结果，表明磁场的变化对振动频率及衰减系数的影响。
Acoustics - methods for measuring the longitudinal sound speed and attenuation coefficient of rubbers and plastics in the frequency range 1mhz to 10mhz 声学1 10mhz频率范围内橡胶和塑料纵波声速与衰减系数的测量方法
Ct method uses array linear detectors to perform high - resolution tomography and yield relative image of linear attenuation coefficient 测出的线衰减系数是相对的，成像要求高分辨。 tgs装置用的是同轴大体积hpge探测器。
( 4 ) the correlation property between the distribution of attenuation factor and that of the group velocity is indicated , in this study ( 4 )研究结果显示，在频率域内，面波衰减系数分布与群速度分布具有一定的相关性。
Especially , the algorithm obtains the phantom ' s mass attenuation coefficient and spectrum of the ct system at the same time 特别地，该算法在给出系统的x射线能谱估计的同时，还给出了构成模体的物质关于不同能量的光子的质量衰减系数的估计。
Abstract : expound the component , the principle and the working process ofthe material attenuation measure device , give the attenuation coefficient calculation method 文摘:阐述了材料衰减测试系统的组成、原理及工作过程，给出了衰减系数的计算方法。
Using the two - station methods , the fundamental - mode interstation attenuation coefficients y was calculated . in order to avoiding the negative attenuation coefficients y 为了避免计算出负的衰减系数的问题，本文提出了用频率域维纳滤波的方法来进行改善。
The study shows that using a obtained from cylindrical surface of column can characterize the alloy steel samples , which have complicated phase structure 研究表明，通过比较圆柱面法测得的相对衰减系数，能够对具有多种相结构的较大尺寸合金钢试样进行超声表征。
It is shown that the optimal cost function will be decreasing if the terminal state of the controller lies in a certain set and the upper bound of the decaying coefficient satisfies some conditions 指出当控制器的终端状态处于某集合内且集结衰减系数的上界满足一定条件时，其最优目标函数递减。
