直升机卫星通信系统关键技术研究

基于直升机卫星通信系统的特点,分析了卫星通信系统中姿态角提取、坐标变化及抗遮挡等关键技术,采用链路分析估算方法,提出了针对关键技术点的测试方案设计,通过工程案例验证,实现了对系统的测试与评估。     

A KU KLUX KLAN CIPHER

Discussion of a cipher system used by the Ku Klux Klan during the 1920's     

一种基于波导E-T结的新型功分器的设计方法

针对传统功分器的不足,提出了一种改进型波导E-T结功分器。通过三维电磁仿真软件CST对其进行了建模仿真,得到一个合理的设计方案,该结构具有高隔离度、低插入损耗、小体积、宽频带等优点。加工的实物经测试在12~17 GHz的频率范围内,该功分器的插入损耗＜0.12 dB,回波损耗＞18 dB,隔离度＞15 dB,具有良好的工程应用价值。     

一种新颖的Ku频段宽带波导功分器

介绍了一种新颖的E面波导T型宽带功分器结构,并利用HFSS软件对这种结构进行了优化设计。实物测试结果表明,在12．5～18GHz频率范围内,插损小于0．3dB,输入端口的回波优于-17dB,与仿真有较好的一致性。     

Complex of HIV-1 Integrase with Cellular Ku Protein: Interaction Interface and Search for Inhibitors

The interaction of HIV-1 integrase and the cellular Ku70 protein is necessary for HIV replication due to its positive effect on post-integration DNA repair. We have previously described in detail the Ku70 binding site within integrase. However, the integrase binding site in Ku70 remained poorly characterized. Here, using a peptide fishing assay and site-directed mutagenesis, we have identified residues I72, S73, and I76 of Ku70 as key for integrase binding. The molecular dynamics studies have revealed a possible way for IN to bind to Ku70, which is consistent with experimental data. According to this model, residues I72 and I76 of Ku70 form a “leucine zipper” with integrase residues, and, therefore, their concealment by low-molecular-weight compounds should impede the Ku70 interaction with integrase. We have identified such compounds by molecular docking and have confirmed their capacity to inhibit the formation of the integrase complex with Ku70. Our data demonstrate that the site of IN binding within Ku70 identified in the present work may be used for further search for inhibitors of the integrase binding to Ku70.     

Effect of Ta addition on magnetic properties of (Fe45Pt55)1−x-Tax thin films

It was studied that FePt-Ta thin films prepared on MgO (1 0 0) buffer-layer by DC/RF magnetron co-sputtering have shown better magnetic properties and micro structural improvement. The Ta-doped FePt-Ta films indicate somewhat differences in micro structural ordering and the aspect of grain growth after annealing. With respect to magnetic property, the sample having 30% increased coercivity was obtained after a heat treatment at 700 °C. In particular the addition of Ta (5.5%) enhances the L1₀ ordering of FePt at relatively high temperature (above 500 °C).     

Ku频段信号模拟器

介绍了一种新型的Ku频段信号模拟器——它采用了软件无线电方法实现多种信号调制方式，可以模拟某些通信系统的高速数据传输，为通信系统的验证试验提供必要的对象信号。     

一种应用于Ku波段脉冲行波管的两级降压收集极的研究

本文介绍了一种应用于Ku波段脉冲行波管的两级降压收集极的研制结果,应用了该两级降压收集极的Ku波段脉冲行波管的总效率已经达到40%以上。     

一种应用于合成孔径雷达的高效率脉冲行波管的研制

本文介绍了一种Ku波段脉冲行波管的研制结果,其总效率在使用一级降压收集极的情况下已经达到30%以上。