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.
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。
The scattering parameter expression of two port properties of impedance Z (in series connection) and admittance Y (in parallel connection) are discussed and their active RC model is presented.
讨论了用散射参数表达的串联阻抗Z和并联导纳Y的二端口特性，给出了它们的有源RC电路模型。
The optical back scattering characteristic of wake is a most important parameter for under water targets' scout , recognition and position.
尾流光的背向散射特性是水下航行体跟踪、识别和定位目标的重要参数。
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