信号杆

通过对常用不同直径波导杆的室内实验，给出了声发射信号在波导杆中传播特性，为选择传播衰减小、传播特性好的波导杆提供理论、实验依据。

By the lab experiment of different diameter wave-guiding rod , the transmitting characteristic of the AE signal in the wave-guiding rod has been given , which offered the academic and experimental foundation for choosing wave-guiding rod of slight attenuation and good transmitting characteristic .

正常发育的斑马鱼，腹部视网膜的RA丰富，视杆和视锥细胞的分化强烈，表明RA信号系统在视杆、视锥的分化成熟中和眼球早期发育起作用。

In normal developed zebrafish , retinoic acid is abundant in abdominal part of the retina , where the development of cones and rods is obvious . This means retinoic acid is effective in cone and rod development and eye development .

用超声波检测信号预报抽油杆剩余寿命

Predict remaining lifetime of pump rod by ultrasonic signal