【摘要】 本文用水浴法测试了白鱀豚额隆切片标本沿体轴方向的声压衰减系数和声速。实验表明额隆内有若干点声衰减为负值及零值、意味着声波沿这些点传输时、声压非但不减小反而增大了。再将这些点连接起来看、恰巧和从左、右鼻栓到头前部的水之间的声传输相一致、这两条途径看起来有点像小声道似的。更多还原

【Abstract】 This paper describes the measurement of ultrasonic attenuation and sound velocity in the melon slices of the Baiji (Lipotes vexillifer) . The experiment showed that in the melon slices there were some points where the sound pressure attenuation coefficient were negative value or zero. It meant that the sound pressure increased instead of decreased when the sound wave propagated along these points. Connecting these points from one to another,we found two sound paths looked like two small sound channels and happened to coincide with the direction from the nasal plugs of the dolphin to the water in front of the head.更多还原