会计电算化中"反复核、反记账、反结账"的研究

"反复核、反记账、反结账"是会计电算化系统中的概念,其功能是使得制单、登账、结账和报表会计业务可以逆向再操作.本文对"反复核、反记账、反结账"的概念、功能以及存在的弊端进行了阐述,并提出了一些改进措施.     

北部湾经济区背景下桂林市“反边缘化”策略研究

分析了“城市边缘化”概念提出的背景，系统界定了“反边缘化”问题的实质在于城市再定位，并基于北部湾经济区这一背景，就桂林市如何突围“边缘化”的策略进行了战略性研究。     

反辐射导弹设计技术

反辐射导弹（ＡＲＭ）是一种利用雷达辐射源的电磁波，发现、跟踪并摧毁雷达系统的导弹。反辐射导弹的出现，使仅有“软”杀伤能力的电子战有了“硬”摧毁能力。论述了反辐射导弹的特点及其局限性，讨论了提高反辐射导弹性能的技术方法。这些技术包括：缩窄工作频带、采用比相比幅单脉冲侧向体制、数字化和集成化设计等。     

如何改善高职高专基础会计的教学质量

论文针对基础会计难入门的特点,提出将其教学内容划分为三个模块:会计基础知识、借贷记账法和基于工作过程的案例教学。会计基础知识模块要求作一般了解;借贷记账法模块要求掌握账户结构和记账规则;基于工作过程的案例教学模块分为三轮进行教学,由简到繁,从个别业务核算到较多业务处理,逐渐深入,通过三轮教学使学习者掌握建账、填写原始凭证和记账凭证、登记账簿、对账、错账更正、试算平衡、结账、编制简单会计报表等。     

俄罗斯反辐射导弹撷览

反辐射导弹亦称反雷达导弹。它是一种专门攻击辐射电磁波的雷达等电子设备的精确制导武器，是压制、摧毁防空系统的主要硬杀伤手段。反辐射导弹的出现，使电子战从电子侦察、电子干扰和反侦察、反干扰扩展到电子摧毁和电子反摧毁阶段，使电子战技术从软杀伤发展到硬杀伤阶段。自美军于２０世纪５０年代末在世界上首先装备了“百舌鸟”（ＡＧＭ－４５）反辐射导弹后，为了与美国竞争，前苏联／俄罗斯同样研制和装备了多种型号的反辐射导弹。目前，一些设计新颖、技术先进的反辐射导弹已经对北约的预警飞机和防空系统中的雷达构成了严重的威胁…     

反隐身雷达发展初探

隐身飞机的巨大作用极大地促进了反隐身雷达技术的研制与开发，现代雷达在研制上皆将反隐身探测功能作为其主要性能之一。本文主要阐述国外若干典型的具有反隐身功能的雷达型号与技术。这些型号与技术皆属于美国、俄罗斯及法国正在装备或研制开发的反隐身雷达，反映出当今反隐身的技术水平及21世纪初反隐身雷达发展的技术方向。     

补偿反造法加工凸轮造模

论述了凸轮造模“补偿反靠”的制造方法。从标准轴的靠拢，修正标准轴的刮削，靠模的反靠，工件凸轮的磨削，以及标准轴和工件凸轮的测量“补偿反靠”的工艺过程等，阐明了轮造模型的制造与检测过程。     

电子对抗中的隐身和反隐身技术

隐身技术属于无源干扰,是有效的抗雷达技术手段.目前应用最广的是“反雷达信号隐身”.实现反雷达隐身的途径有三种:(1) 改变飞机机身结构与外型;(2) 在飞行器外表面涂敷雷达电磁波吸收材料;(3) 用高强度、低比重的复合材料制作飞行器结构部件.随着隐身技术的发展,各种反隐身技术也应运而生.采用脉冲压缩技术、多波段雷达或频率捷变技术、降低噪声,以及采用其他一些非电子反隐身技术,都能有效地提高雷达效能.     

反辐射导弹的无线电电子设备

介绍了反辐射导弹的无线电电子设备的组成及其工作原理,对其提出的具体要求及有关技术的实现方法.以“哈姆”导弹导引头的结构为例,论述了导引头接收机的设计原理,给出了弹上接收机的工作原理框图.     

反卫武器发展何去何从

随着空间技术的迅速发展和广泛应用，日常经济生活和军事行动对空间系统的依赖日趋增强，空间系统已成为国家基础设施重要的组成部分，空间安全越来越受到世界各国的重视。反卫武器作为威胁空间安全的首要因素，长期困扰世界各国。本文分析已有国际条约对反卫武器的限制，回顾国际上限制反卫武器发展的努力，介绍布什新空间政策发布后反卫武器发展的新动向，阐明制订反卫武器控制协定可供选择的5种模式，为制定反卫武器控制协定提供了借鉴。     

电工电子类课程多媒体教学的体会

本文分析了在电工、电子技术课程中采用多媒体教学的特点和遇到的问题,并且叙述了一些多媒体课件制作的方法。     

浅析"模仿-反馈"练习法在体育实践教学过程中的作用

在我国普通高校广泛实行"快乐体育"教育理念形势下,总结当前体育实践教学过程存在的不足,分析"模仿-反馈"练习法的特点及作用.得出,"模仿-反馈"练习法有利于发挥学生学习的自主性、积极性和创造性,对学生课堂主体意识的培养以及"快乐体育"教育理念的实现具有重要的促进作用,同时也有利于教师因材施教提高教学效率.     

A comment on "the far future of exoplanet direct characterization"--the case for interstellar space probes

Following on from ideas presented in a recent paper by Schneider et al. on "The Far Future of Exoplanet Direct Characterization," I argue that they have exaggerated the technical obstacles to performing such "direct characterization" by means of fast (order 0.1c) interstellar space probes. A brief summary of rapid interstellar spaceflight concepts that may be found in the literature is presented. I argue that the presence of interstellar dust grains, while certainly something that will need to be allowed for in interstellar vehicle design, is unlikely to be the kind of showstopper suggested by Schneider et al. Astrobiology as a discipline would be a major beneficiary of developing an interstellar spaceflight capability, albeit in the longer term, and I argue that astrobiologists should keep an open mind to the possibilities.     

编队飞行卫星在间断式导航、天基干涉仪和分工式工作星的可行性构想

对将编队飞行卫星应用于用户间断性三维无源自主定位导航 ,用干涉仪对敌方目标被动定位和卫星分工式工作的可行性进行初步分析对比研究 ,除指出这些构想的队形要求和优点外 ,同时也给出其缺点和存在的困难     

An analysis of low-frequency component in microacceleration measurements made onboard the <Emphasis Type="Italic">Foton M-2</Emphasis> satellite

The low-frequency component is investigated in the data of measurements performed onboard the Foton M-2 satellite with the three-component accelerometer TAS-3. Investigations consisted in comparison of this component with its calculated analog found from a reconstruction of the satellite’s attitude motion. The influence of the Earth’s magnetic field on the accelerometer readings is discovered by way of spectral analysis of the functions representing the results of determining the low-frequency microacceleration by two methods. After making correction for this influence, the results obtained by these two methods coincided within a root-mean-square error of less than 10^?6 m/s².     

The relative role of visual and non-visual cues in determining the perceived direction of "up": experiments in parabolic flight

In order to measure the perceived direction of "up", subjects judged the three-dimensional shape of disks shaded to be compatible with illumination from particular directions. By finding which shaded disk appeared most convex, we were able to infer the perceived direction of illumination. This provides an indirect measure of the subject's perception of the direction of "up". The different cues contributing to this percept were separated by varying the orientation of the subject and the orientation of the visual background relative to gravity. We also measured the effect of decreasing or increasing gravity by making these shape judgements throughout all the phases of parabolic flight (0 g, 2 g and 1 g during level flight). The perceived up direction was modeled by a simple vector sum of "up" defined by vision, the body and gravity. In this model, the weighting of the visual cue became negligible under microgravity and hypergravity conditions.     

The first "space" vegetables have been grown in the "SVET" greenhouse using controlled environmental conditions

The paper describes the "SVET" project--a new generation of space greenhouse with small dimensions. Through the use of a minicomputer, "SVET" is fully capable of automatically operating and controlling environmental systems for higher plant growth. A number of preliminary studies have shown the radish and cabbage to be potentially important crops for CELSS (Closed Environmental Life Support System). The "SVET" space greenhouse was mounted on the "CRYSTAL" technological module docked to the Mir orbital space station on 10 June 1990. Soviet cosmonauts Balandin and Solovyov started the first experiments with the greenhouse on 15 June 1990. Preliminary results of seed cultivation over an initial 54-day period in "SVET" are presented. Morphometrical characteristics of plants brought back to Earth are given. Alteration in plant characteristics, such as growth and developmental changes, or morphological contents were noted. A crop of radish plants was harvested under microgravity conditions. Characteristics of plant environmental control parameters and an estimation of functional properties of control and regulation systems of the "SVET" greenhouse in space flight as received via telemetry data is reported.     

Sulfuric acid Speleogenesis associated with a glacially driven groundwater system-paleo-spring "pipes" at Borup Fiord Pass, Nunavut

Gypsum filled "pipe" features were discovered in the proglacial area of the Borup Fiord Pass supraglacial sulfur spring. Stable isotope data suggest that gypsum is formed through oxidation of sulfides and are consistent with models of sulfuric acid speleogenesis. These results suggest that gypsum pipes are paleo-spring discharge channels analogous to those that feed the modern sulfur spring at Borup Fiord. A conceptual model is proposed whereby retreat of the glacial front and associated growth of permafrost in ground exposed now to low arctic temperatures leads to "freezing-in" of the spring system and abandonment of old channels in favor of more open flow systems in the subglacial region. Results provide a model for glacially driven groundwater systems that may form in association with Mars' polar icecaps and potential geological signatures for paleo-groundwater discharge.     

俄罗斯“火星—96”探测器

该文主要叙述俄罗斯“火星—96”探测器的飞行过程,着陆器在火星上的着陆过程以及穿透器的工作情况。     

海上“网络中心战”

海上"网络中心战"以计算机网络为中心和基础,使整个海上战场、各种部队、各个武器平台形成有机的整体,以提高海上整体作战效能.介绍了"网络中心战"的体系结构和协同交战能力系统,进行了作战效能分析.