1) fore-and-aft amplitude ratio
前后幅比
1.
It also describes the working principle and relative acoustics performance of the tri-modal directional transducer, and gives the test results of directivity,transmitting voltage response,fore-and-aft amplitude ratio,efficiency,etc.
描述了三模态换能器的工作原理和有关声学性能,给出了指向性、发射电压响应、前后幅比、效率等测试结果。
2) assembling of front & back part
前后幅合并
5) before and after comparison
前后对比
1.
An effect post-evaluation model,combination of fuzzy analytic hierarchy process and before and after comparison process was putted forward.
针对水利加固改造工程的特点,构建了评价指标递阶层次结构及模糊层次分析法与前后对比分析法相结合的效果后评价模型,并将模型应用于南四湖二级坝二闸加固改造工程实例中。
6) front-to-back
前后比
1.
The radiation characteristics of this antenna are very good, with a front-to-back ratio >18db and cross polarization level <-18db.
文章介绍了一种中心频率为3GH的微带准八木天线,这种天线的辐射性能非常好,其前后比大于18dB,交叉极化电平小于-18dB,这些性能都已经通过FDTD仿真得到验证。
补充资料:前后
前后
生理术语。出《黄帝内经》。前为小便,后指大便。《灵枢·邪气脏腑病形》:“肾脉急甚为厥癫疾;微急为沉厥奔豚,足不收,不得前后。”
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条