靶后炸点距离测试仪前放装置的研制

本文介绍了一种靶后炸点距离测试仪前放装置的设计、通过采集弹丸从发射到爆炸过程所产生的各种光信号，并运用光纤编码的原理进行分析从而确定炸点的距离，该装置设计新颖，精度高，配合后置的瞬态记录仪可进行实时测量和纪录。     

一种适合于非相干直扩信号捕获的方法

介绍了非相干直接序列扩频的基本概念,并建立了非相干直接序列扩频信号基带传输模型;在此基础上研究了直接序列扩频中捕获的难点,并提出一种基于后相关滤波和功率检测的捕获方法;最后,根据工程需要对系统进行了简化。仿真结果表明提出的捕获方法是适合非相干直接序列扩频的,且性能接近相干直接序列扩频。     

Air Tight ATM-4电子管后级功率放大器

这台具有古典气质的电子管后级功率放大器的诞生背后有一个小故事：在1991年8月时Air Tight收到了一封来自前苏联的信件，内容是说MIST公司与前苏联军方签定的电子管生产合约已经终止，因此可以开始对一般民用厂商提供各种电子管。在产品清单中，Air Tight看到了以前一代名机Mclntosh MC240所使用的6L6-GC功率放大管，引起了设计师的极大兴趣。     

后向攻击技术方案的对比与选择

以空战前向攻击为参照，以对比的方式分析，论证了导弹越肩发射后向攻击和后向发射后向攻击技术方案的特点和存在的问题，在此讨论的基础上，提出了选择空战导弹后向攻击技术方案的倾向性意见。     

理论物理所专题讲座(Colloquium)简况

 在理论所第十次专题讲座上,中科院生物所郭爱克研究员作了题为《脑--世界的选择性表征》的报告.     

Experimental Investigation of High Power Erbium-Ytterbium Co-doped Double Clad Fibre Laser

All-fibre high power erbium-ytterbium co-doped double clad fibre lasers are proposed and demonstrated. By using different back-cavity mirrors, the different double clad fibre lasers are constructed. It is experimentally found that the output behaviour of laser can be controlled by a back-cavity mirror. The lower the reflectivity of the back-cavity mirror, the higher the output power and the high the slop efficiency. The maximum output power is about 1.6 W and the slop efficiency is 27.6%.     

用后向散射压缩器产生超高强度激光

报道自制的一台小型的激光系统,用后向布里渊散射与光栅压缩系统组合,把5ns激光脉冲压缩到40ps,压缩率大于100倍.     

Mechanism for Influence of Nose Bluntness on Asymmetric Vortices

Pressure distributions on slender bodies are measured at various roll angles; it is found that the side loads on the blunted-nose slender body are as small as one-third of that on a pointed-nose one, or even zero at some roll angles. Numerical simulation shows that different flow structures are generated on the leeside of the bodies with different noses. The results confirm that a structure of U-shaped horseshoe vortex develops on the top of the blunted nose due to the closed type of surface flow separation. The shear layer separated from the nose is entrapped into the horseshoe vortex core and forms two mainof this structure is to hold in the two main nose vortices andvortices on the two sides of the body. The function to restrict the emergence of asymmetry.     

“粉末包埋”型离子交换树脂的研究

本文介绍了一种新型树脂—“粉末包埋树脂”的合成及性能。在三聚氰胺—甲醛的预聚浆液中加入无机离子交换剂磷钼酸铵(AMP),经悬浮聚合,可得到含有AMP的珠状“粉末包埋树脂”AMP—MF。这类树脂具有AMP的特殊选择性及优良的机械性能。珠状树脂适宜柱层析操作,克服了粉末状无机离子交换剂AMP不适于工业操作的缺点。本合成方法为制备特大孔型缩聚珠提供了一新的合成途径。