While the chips are attached to near center or near a edge of subatrate , the mean , deviation and maximum are at the almost same level ; when the chip is attached near a corner , the deviation and the maximum is far larger than those of the above two positions ; during thermal treatment followed , the residual stress demonstrates a regular cycle trend when the chips are attached near center or edge of the substrate and fluctuates in a wide range when the chip is attached near a corner 当芯片粘贴在基板中心和靠近基板边缘的位置时粘合剂固化后残余应力的平均值、最大值和数值的分散性皆处于相接近的水平,而当粘贴在基板靠近一角的位置时应力分布状况则有很大不同:应力的分散性增大,应力最大值也远大于粘贴于另外两个位置时的值。
( 2 ) based on the propagation equation of fgbs passing through unapertured paraxial abcd optical systems , the similar transformation conditions are obtained for the first time , which is expressed as that two fgbs with the same beam order have similar intensity distributions at the two positions of equal generalized fresnel number when they propagate through two ajb , cjdi ( i = l , 2 ) systems . furthermore , a comparison between a fob and a sgb of the same beam a ^ - factor but different waist widths is performed for the first time ( 2 )通过对作为整体的平顶高斯光束在无光阑限制近轴abcd光学系统中传输公式的分析,首次得到了平顶高斯光束的相似变换条件,即阶数相同的平顶高斯光束在传输矩阵为a _ ib _ ic _ id _ i ( i = 1 , 2 )的两个光学系统中传输时,在菲涅尔数相等的两个面上具有相似的光强分布。