脏外染料被动压缩准分子激光的输出脉冲特性研究

用紫外染料PTP、BPBD、t-B_uPBD等对XeC1准分子激光施行腔外被动压缩,获得了压缩比为3的XeC1激光脉冲透射输出和压缩比大于8的染料辐射输出。提出“光子传输速率方程”来描述被动压缩现象,计算机模拟计算结果较好地解释了准分子激光压缩及染料辐射的实验结果。

螺旋波纹波导被动式脉冲压缩模拟研究

研究了一种基于螺旋波纹波导特殊色散特性对输入微波脉冲进行压缩的新方法。利用3维全电磁粒子模拟软件对X波段螺旋波纹波导进行了建模,模拟分析了该波导的特殊色散特性及提高功率增益的方法,并将已有模型脉冲压缩增益提高了6.65。模拟结果表明:通过优化输入微波的频率调制特性,可以获得更加符合被动式脉冲压缩所需要的调频形式;采用改进后的椭圆波导,可以得到更有利于被动式脉冲压缩的本征模式;通过延长渐变段长度,可以减少规则段和渐变段之间不均匀性造成的微波反射,从而实现更高的脉冲压缩增益。

基于螺旋波纹波导高增益高效率被动式压缩方法

对一种改进型螺旋波纹波导实现高增益高效率被动式脉冲压缩进行了研究,并利用微扰理论求解出了该波导的损耗特性。结合波导的色散和损耗特性,设计了输入微波的频率调制形式。还对改进型螺旋波纹波导进行了模拟研究,在输入脉冲宽度为66ns的条件下,得到了半高宽为1.9ns的压缩脉冲,增益为21.2倍,脉冲宽度比为34.7倍,压缩效率为61%,这表明改进型螺旋波纹波导应用于被动式脉冲压缩具有高效率高增益特性。

旋转磁通压缩脉冲发电机驱动电磁轨道炮实验

介绍了被动式旋转磁通压缩发电机和电磁轨道炮的基本原理。给出了 2 5MW被动式旋转磁通压缩发电机的短路实验和驱动电磁轨道炮的连发实验 ,连续将 4发 7.8g弹丸驱动到2 50m·s- 1。

Seismic Response of Liquid-Filled Tank with Baffles

In thispaper, the effects of a rigid baffle on the seismic response of liquid in a rigid cylindrical tank are evaluated. A baffle is an annular plate which supplies a kind of passive control on the effects of ground excitation. The contained liquid is assumed incompressible, inviscid and has irrotational motion. To estimate the seismic response, the method of superposition of modes has been applied. To analyze the rigid tank response, Laplace＆#39;s equation is considered as the governing equation of the fluid domain, in both time and frequency domains. The boundary element method （BEM） is employed to evaluate the natural modes of liquid in a cylindrical tank. To gain this goal, the fluid domain is divided into two upper and lower parts partitioned by the baffle. Linearized kinematic and dynamic boundary conditions of the free surface of the contained liquid have been considered.