3db

Experimental results are presented which show that the new structure offers larger input signal range , wider & 3dB frequency bandwidth and higher slew rate than the basic OTA .

测试结果表明，这种新结构OTA在输入信号允许范围、&3dB带宽、转换速率等方面均优于基本OTA。

Three-dimensional braided carbon fiber reinforced silicon oxycarbide composites ( 3DB C_f / Si O C ) were fabricated via polysiloxane infiltration and pyrolysis .

采用聚硅氧烷（PSO）先驱体浸渍裂解工艺制备出碳纤维三维编织物增强SiOC复合材料（3D-BC（？）

The result shows that the OCDMA access network based on DQPSK modulation has the advantages of ~ 3dB enhanced spectral efficiency , higher security performance , fixed receiver threshold , more sensitive receiver , better robust performance to system noise and so on .

结果显示，基于DQPSK的OCDMA接入系统，具有3dB的频谱利用率优势、更高的安全性能、接收机的判决阈值固定、接收灵敏度高和良好的抗噪声性能等优点。

The three dimensional lead rubber dish bearings ( 3DB ) is composed of lead rubber beading in series with lead dish spring . The lead rubber bearing is used in horizontal isolation of earthquake while the lead dish springs bearing is in vertical isolation of earthquakes .

铅芯橡胶碟簧三维隔震支座（3DB）由铅芯叠层橡胶支座和铅芯碟形弹簧支座串联组成，铅芯叠层橡胶支座用于水平隔震，铅芯碟形弹簧支座用于竖向隔震。

Method : In an environment of 50 ± 3dB ( SPL , A ) background noise , with the audiometer developed by the authors , and an electric otoscope , the hearing of 195 infants aged 38 & 93 days in Beijing area were examined .

方法：在背景噪声为50±3dB（SPL，A）环境，使用作者自行研制的BA-33型听力筛查仪和电耳镜对195名北京市区38-93天的婴儿进行检查。