A phase controlled antenna system for anti-jamming purposes

A phase controlled antenna system has been constructed for aircraft EW purposes. With only two radiating elements conventionally installed on top of the fuselage, the system is capable of introducing a 30 dB radiation pattern minimum to desired or optimized directions. The system uses computer controlled parallel down conversion technique, which gives the freedom to automatically adjust for any anomalies in the respective individual element patterns, normally caused by the airframe structures. The same computer can be used for active search-and-minimize procedures. Extensive tests have been performed with an F-18 scale model to verify the system performance     

Future instrumental capabilities in the energy range of nuclear transitions

Gamma-ray lines are the fingerprints of nuclear transitions, carrying the memory of high energy processes in the universe. Setting out from what is presently known about line emission in gamma-ray astronomy, requirements for future telescopes are outlined. The inventory of observed line features shows that sources with a wide range of angular and spectral extent have to be handled: the scientific objectives for gamma-ray spectroscopy are spanning from compact objects as broad class annihilators, over longlived galactic radioisotopes with hotspots in the degree-range to the extremely extended galactic disk and bulge emission of the narrow e^-e⁺ line.The instrumental categories which can be identified in the energy range of nuclear astrophysics have their origins in the different concepts of light itself: geometrical optics is the base of coded aperture systems — these methods will continue to yield adequate performances in the near future. Beyond this, focusing telescopes and Compton telescopes, based on wave- and quantum- optics respectively, may be capable to further push the limits of resolution and sensitivity.     

The story behind Finnish telecommunications industry: militaryradio systems and electronic warfare in Finland during World War II(1939-1945)

The growth of the Finnish telecommunications industry is not only based on the common Nordic need of talking to each other nor is it only dependent on the generally superior technical skills achieved through education but also has its tradition, which dates back to the years of WW II, when Finland was alone at the most critical moments of the nation's history and had to develop procedures and technologies to survive. From post-war documents, a connecting link can be found between key persons and organizations, which were once designing military electronics, but later adopted their know-how to the needs of public communications     

科技综合实力评估指标与数学模型

运用灰色系统原理和德尔菲法，建立了省级区域科技综合实力评估指标体系。在灰色定权聚类模型的基础上，提出了一种基于三角白化权函数的评估模型。     

基于Euler方程的翼型优化设计高效基因算法研究

把基因算法 ( GAs)用于翼型优化设计 ,构造了用于优化设计的适应度函数 ,发展了一种具有全局优化性能的翼型优化设计方法。为提高算法的搜索效率 ,提出了改进型的实数编码方式 ,设计了新型的 Bézier样条翼型基因表达方式 ,并发展了高效隐式 Euler方程解算器。用此方法进行了基于升阻比极大化的跨音速和基于阻力极小化的超音速翼型优化设计数值模拟 ,取得了令人满意的结果。     

基于CORBA的制造执行系统的实现

提出了一种适合我国离散制造业的制造执行系统的功能模型，针对传统的制造执行系统缺少柔性，不易重构，难以维护的缺点，系统地论述了基于CORBA（Common object request broker architectore)的制造执行系统的实现方法，包括领域分析，面向对象分析，面向对象设计和应用CORBA技术实现制造执行系统等主要内容，实例证明该系统具有良好的扩展性，可重构性和易集成性。     

纤维增强塑料拉挤型材弯曲强度研究

研究了纤维增强塑料 ( FRP)拉挤型材的弯曲强度。试验结果表明 ,FRP拉挤型材在大跨距 (跨高比 l/h>1 0 )下的弯曲破坏模式通常是梁的纵向开裂 ;FRP拉挤型材由于剪切变形较大 ,强度计算时不能按普通各向同性梁理论进行计算 ,应考虑剪切变形的影响。为此 ,本文应用复合材料薄壁梁理论给出了 FRP拉挤型材在大跨距下弯曲强度计算的半经验公式     

大规模定制设计的产品簇匹配研究

采用基于规则与基于实例相结合的推理方法，给出典型的基于实例推理的专家系统解决问题的一般过程，本文重点研究大规模定制设计的产品簇匹配问题，实施二级匹配策略，先采用规则推理的方法对产品簇大类属性进行匹配，缩小匹配范围，后采用基于实例推理的方法对产品簇小类具体属性进行定量精确匹配，优化了设计手段，效果良好。     

宽带高效率E类功放负载网络的设计

依据“参数补偿压缩法”的原理，给出宽带E类功放电路，借助于电路优化理论设计出实际的宽带负载网络，制作出一个工作于30－90MHz，输出功率为7．6－10．2W，总效率为72％－84％的功放电路，实验证明，该宽带负载网络及其设计方法正确且实用。     

企业MIS数据集成

企业管理信息系统（MIS）大多数是按单项业务开发的,不同系统的开发方式以及对于开发规范的遵从程度都有所不同,这使得各系统之间存在很强的孤立性,使企业内部许多信息难以交换,各部门开发出的管理信息系统最终成为一个个“信息孤岛”。本文针对目前企业信息集成所存在的这一问题,结合目前企业信息化工作的热点－企业信息集成,根据本人在对某集团企业开发MIS的基础上,介绍了企业MIS数据集成的目标,基础工作,探讨了解决企业MIS数据集成的方案和策略,并介绍应用实例。