束头

首先将认知用户发送给束头和直接发送给融合中心的误比特率进行比较从而筛选束内认知用户。

Compare the the bit error rate under the cognitive users send message to cluster head and which sends it to the fusion center directly , selected the cluster members .

电子束钎焊接头组织分析

Analysis of the microstructure of the electron beam brazed joint

根据测量系统的要求，对激光传感器的光源、光纤束、测头部分都分别进行了设计以提高精度。

According to the requirements of the measurement system , designs the light source , fiber bundle and the probe .

通过实验研究了大能量激光束对光纤连接头和光纤端面的烧蚀作用。

The ablation of optical fiber connector and end face by a high energy laser beam were studied through experiment .

分析认为，QCr0.8／1Cr21Ni5Ti电子束熔钎焊接头组织结构的形成是由匙孔形熔池形成阶段、熔合过渡层形成阶段、钎缝形成阶段及最终组织形成阶段组成。

The analysis shows formation of EB melt-brazed joint is made up of four steps : formation of molten pool with keyhole , formation of fusion transition layer , formation of braze welding seam , formation of final microstructure .