Alterations in adenylate ratios in plant cells after accelerated ion irradiation.

Levels of adenylate metabolism have been studied in cells of Nicotiana tabacum growing in vitro, and in root apex extracts of Pisum sativum irradiated at the 95-in. isochronous cyclotron U-240, Institute for Nuclear Research, Ukrainian National Academy of Sciences, Kyiv. Particle beams of accelerated helium ions with energy 9.34 keV/micrometer were used. Replacement and rapid freezing of the irradiated plants samples in liquid nitrogen were carried out with a manipulator and a remote control system. After doses of 5, 20, 50, and 100 Gy of gamma-irradiation, as well as 50 and 100 Gy 4He irradiation, the cellular ATP/ADP ratio increased during early stages of the response. This effect was absent at higher doses and after exposure to sparesly-ionizing radiation, when a rapid decline in the cellular ATP concentration and the ATP/ADP ratio occurred.     

Rocket observation of the ultraviolet spectrum of comet Halley

An ultraviolet sounding rocket telescope/spectrograph experiment observed Comet Halley on 26 February 1986, 17 days after perihelion. From the long-slit spectra, the production rates of O, C, and CO are calculated. The derived water production rate is a lower limit of 5.0 × 10²⁹ s⁻¹ and the volume mixing ratio of CO to H₂O is 21%. The predicted brightness distribution from a radial outflow model with H₂O and CO as parent molecules are in accordance with the measured spatial profiles of OI and CO emissions. The ratio of the production rates of CO to C is 2.7 which is consistent with the carbon source being the photodissociation of CO. However, the radial outflow model which best fits the CO data predicts significantly weaker CI emissions than was observed. A better fit to the carbon data is found when an inner coma source of C at a rate of 3% of the water production rate is included in the model.     

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。     

一种变论域模糊自适应导引律研究

针对空空导弹的导引律问题，基于模糊逻辑和遗传算法．提出了一种论域自调整的进化模糊导引律。将导弹与目标的接近速度以及导弹的视线角速度作为模糊控制器的输入，指令加速度作为输出，并在传统的模糊逻辑控制基础上引入了一个非线性变论域函数，从而实现了模糊变量论域的动态改变，然后使用遗传算法对导引规则进行了寻优。以某型空空导弹模型为对象使用MATLAB对导弹攻击过程进行了仿真。仿真结果表明，该方法的机动过载小，拦截飞行时间短，是一种较为优越的制导方法。     

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