F-117A飞机外形隐身性能的研究

本文简要地介绍了美国隐身战斗机F—117A的有关情况,并模拟了F-117A的外形,制作了模型,经雷达测试后,得出在各姿态角下的雷达散射截面,用突防理论对F—117A进行隐身性能分析。并据此得出了应加强具有隐身性能材料研究的结论。     

智能化人口-经济发展战略决策支持系统CDSS

本文提出将基于人工智能技术、运用知识和推理的专家系统与基于数字仿真技术、运用数据和模型的仿真模型体系相集成的智能化决策支持系统CDSS。CDSS用领域专家的知识选择和组合模型,完成问题的推理和系统的仿真运行。系统支持决策过程的各阶段并通过人-机界面实现定性与定量相结合的交互式决策。其系统结构对解决管理科学中非结构化问题具有普遍适用的价值。     

英汉古典诗格律比较

诗是最凝练、最富有表现力的艺术形式,是语言的精华,诗的格律是由无数诗人的长期创作实践而形成的一套诗创作声律方面的格式和规则。格律的各种要素,使人们在听觉上,视觉上和意念上对诗歌产生综合的美感。平仄及音步的程式能使诗产生抑扬之美,用韵规则可使诗具有回环之美。     

应用BDP光度法测定水中微量阴离子表面活性剂

本文报导了用溴化—1—苄基—4—(4—二乙基氨基苯偶氮)吡啶盐(BDP)光度法测定水中微量阴离子表面活性剂,实验结果,回收率为90.2％—104.8％;标准偏差为O.0193;变异系数为O.64％。     

可逆变流器的OPWM控制

提出一种适用于单片机实现的可逆变流器谐波优化控制方法 .它使变流器可以工作于较低的载波频率而具有近于零的低次谐波 ,因而特别适用于 GTO大功率变流器 .论述了优化开关角的求解方法 ,分析了优化开关角的特点 .仿真结果表明了优化开关角解的正确性     

简论哲学现代化

马克思主义哲学现代化问题是近年来哲学界普遍关心的问题，但始终未能达成共识。本文认为，哲学现代化的实质是哲学的时代化。其具体内容应当包括：对象现代化、体系现代化、内容现代化、功能现代化、哲学应用化、哲学通俗化     

Graft of Polybutylene Terephthalate Meltblown Nonwovens by Plasma Initiation and Their Surface Performance

Main factors affecting the low temperature plasma initia-tion and graft modification of acrylic acid onto polybuty-lene terephthalate(PBT)meltblown nonwovens are stud-ied.The relations between hydrophilic performance ofthe product and plasma power,treating time,andmonomer concentration are investigated.The surfaceperformances of grafted products are analyzed.It is ob-tained that hydrophilic performance of PBT nonwovens isgreatly improved due to the etching of the plasma andthe introduction of polar groups so as to meet the needsof leukocyte depleting materials.     

Study On Pattern Design of Men''''s Tailored-suit Sleeve

Sleeve pattern design of men' s tailored - suit is one of the most difficult problems of clothing pattern design. Based on the experimental studies of armhole girth, the difference of armhole width and crown height, crown angle, under sleeve curve's diagonal line length, crown ease and its distribution rule, this paper mainly deals with the sleeve pattern design of tailored - suit for Chinese men. The influences of these factors are discussed and furthermore, some qualitative, quantifiable conclusions are drawn to design perfect pattern of men' s tailored - suit sleeve.      

Measurement and Analysis of a Take-down Mechanism of Eccentric Links

In this paper the rule of take-down speed variationthrough a mechanism of eccentric links is analysed.Us-ing telemetric technique,the authors dynamicly mea-sured take-down speed and tension of this mechanism.The curve diagram of the take-down speed is experi-mentally obtained.Results of theoretical analysis and ex-perimental measurement show that take-down tensionof this kind of mechanism is more even than that of theoblique rings in model Z214 interlock machine and it isdeeply affected by many factors which include the instal-lation of the conic gear,horizontality of the take-downroller,gaps between hinge joint points of the wholemechanism and so on.     

Measuring Fiber Orientation in Nonwoven Fabrics by Laser Scattering Method PartⅠ Principle and Instrumentation

The scattering performance of a parallel laser beam onthe parallel fiber model and nonwoven fabrics are studiedin detail. A device of computer - program - controlledsystem for measuring laser scattering intensity - angledistribution function of fiber assemblies is set up, and themeasuring condition for distingulslhing the fibers ar-ranged at different directions is carried out. The materi-als of two categories, the models of fiber assembly andnonwoven fabrics made with varied processing methods,are studied. The analysis and experiments show that thefiber orientation distribution functions in the 2 - dimen-sional fiber assemblies can be sensitively determined bylaser scattering method.