The influences of different parameters on the transverse acoustic phonon excitation are also illustrated. It's found that the coupling of the magnon-phonon coupling and the spin wave stiffness are the main factors affecting the transverse acoustic phonon softening. 并且又讨论了各项参数对横向声频支声子激发的影响,发现磁振子-声子耦合与自旋波劲度常数对横向声频支声子软化起很大的作用。
Explicit expressions for the acoustic reflection coefficients from the interfaces are given and ultrasonic experiments for measuring the interface stiffness constants are described. 文章还给出了两相同固体中界面声反射系数的表达式,介绍了测量界面劲度常数的超声反射谱方法。
Background Acoustic radiation force impulse imaging ( ARFI) is a newly developed technique for the evaluation of tissue stiffness. 研究背景声脉冲辐射力成像(ARFI)是一种可用于评价组织弹性的新型超声弹性成像方式。