共查询到20条相似文献,搜索用时 562 毫秒
1.
采样时间序列的故障数据检测与滑动容错滤波 总被引:1,自引:0,他引:1
在导出采样时间序列数据滑动LS滤波的基础上,本文建立了了组简洁的故障数据检测与修复算法,地故障数据修复与滤波估计相结合,构造了对突发性故障数据有良好容错能力的滑动容错滤波算法。仿计算证实,该方法有效、可靠。 相似文献
2.
为弥补战争损耗,保持飞机的持续战斗力,必须对战伤飞机进行速修复,而决定战伤修复效率的关键因素是飞机本身所具有的固有属性-战伤修复性,本文分析了战伤修复的特点,给出了评估方法,战伤修复性设计要求和措施。 相似文献
3.
DME设备频繁出现遇天气炎热就双机双监控器“输出功率”告警,导致设备自动切换及以次告警维持工作,严重地影响了设备的正常运行。经导航技术人员的努力最终确定故障部位在造价昂贵的天线上。DME天线结构复杂且在检修上无任何经验可借鉴,技术人员在做了认真的技术准备后,一步一步地检查出天线存在的各种故障,并逐一予以排除,最终将天线系统修复。本文详细介绍了DME天线故障引起的设备告警,并对如何确定天线故障及修复天线提供了检测、检修方法。 相似文献
4.
5.
为了解决军机备件配置不合理的问题,通过对飞机预防性维修和修复性维修备件的需求分析,提出了一种较为科学的备件确定方法,开发了确地件项目和数量的计算软件。 相似文献
6.
7.
8.
张兴才%容敏智%章明秋 《宇航材料工艺》2006,36(1):1-4,63
着重从修复机理出发分别介绍了金属基、陶瓷基和聚合物基自修复材料的研究进展,分析了达到良好自修复功能对材料结构、组成和性能等方面的要求,综述了自修复材料的研究进展、存在的问题及其发展方向。 相似文献
9.
介绍了一种存储器自修复电路的仿真设计,其中内建自测试模块中的地址生成器采用LFSR设计,它面积开销相当小,从而大大降低了整个测试电路的硬件开销。而内建自修复模块采用基于一维冗余(冗余行块)结构的修复策略设计。通过16×32比特SRAM自修复电路设计实验验证了此方法的可行性。 相似文献
10.
11.
E 级计算给 CFD 带来的机遇与挑战 总被引:4,自引:0,他引:4
E 级(Exascale)计算机有望在2020年前后投入使用,E 级计算将给计算科学和科学研究带来革命性的变化。计算流体力学(CFD)作为超大规模计算机应用的重要领域之一,将迎来前所未有的发展机遇,同时也将面临极其严峻的技术挑战。本文对当前国内外超大规模 CFD 计算的现状进行了概述,探讨了未来 CFD 的发展趋势,并对 E 级计算给 CFD 带来的机遇与挑战进行了分析,最后提出了适应未来 E 级计算的 CFD 发展思路与建议。为了实现 E 级计算的宏伟目标,CFD 与计算机科学、应用数学等学科的“协同设计”势在必行。我们期待本文的分析能对我国的高性能计算应用、CFD 发展有一定的启示作用。 相似文献
12.
13.
《中国航空学报》2021,34(2):182-190
The advancement of Unmanned Aerial Vehicle (UAV) technology in terms of industrial processes and communication and networking technologies has led to an increase in their use in civil, business, and social applications. Global rules in most countries had previously limited the use of drones to military applications due to their deployment in the open air, drones are likely to be lost, destroyed, or physically hijacked. However, more recently, the presence of COVID-19 has forced the world to present new implementing measures which will also widen the use of drones in civil and commercial and social applications, especially now in the delivery of medicines for medical home care. In the period of required public isolation as a consequence of the SARS-COV-2 pandemic, this knowledge has become one of the principal partners in the fight against the coronavirus. This paper offers a summary of the medical drone manufacturing, with a specific emphasis on its approval by the pharmaceutical sector to solve logistical problems in healthcare during times of sensitive need. We also discuss the numerous challenges to be met in the integration of drones to save our lives and suggest future research directions. The question that arises for this problem, how to optimize delivery medical supplies times in-home health care made up of drones? We conducted a synthesis literature review devoted to the use of UAVs in healthcare with their different aspects. A total of different research made are given to describe the role of UAV in Home healthcare with the presence of SARS-COV-2. We conclude that the drones will be able to optimize the way of eliminating contamination with a very high percentage (through the reduction of human contact) with the increase of the flexibility of the flight (reaching the less accessible regions every hour of the day). 相似文献
14.
Gerhard Haerendel 《Space Science Reviews》2006,124(1-4):317-331
Three types of processes, occurring in the weakly ionized plasmas of the Earth’s ionosphere as well as in the solar chromosphere,
are being compared with each other. The main objective is to elaborate on the differences introduced primarily by the grossly
different magnitudes of the densities, both with respect to the neutral and, even more so, to the plasma constituents. This
leads to great differences in the momentum coupling from the plasma to the neutral component and becomes clear when considering
the direct electric current component transverse to the magnetic field, called “Pedersen current”; in the ionosphere, which
has no quasi-static counterpart in the chromosphere. The three classes of processes are related to the dynamical response
of the two plasmas to energy influx from below and from above. In the first two cases, the energy is carried by waves. The
third class concerns plasma erosion or ablation in the two respective regions in reaction to the injection of high Poynting
and/or energetic particle fluxes. 相似文献
15.
Gambling is prohibited in Taiwan, although it has existed in the society for a long time. With the emergence of the Internet in the past decade, not only is e-commerce being promoted, but Internet gambling as well. The negative influence of Internet gambling, however, is much greater than the impact of traditional gambling on our society. Due to the properties of anonymity, lack of boundaries, and the rapid spread on the Internet, it is becoming increasingly difficult for law enforcement to seize suspects who engage in illegal gambling. In this paper, we introduce some serious problems resulting from Internet gambling, and provide a procedure to investigate and curb the spread of Internet betting in Taiwan. According to our proposal, the information of evidence collected is believed to be presented conclusively in a court of law. Persons attempting to bet on the Internet should be deterred. 相似文献
16.
Numerous attempts have been made over the years to link various aspects of solar variability to changes in the Earth's climate. There has been growing interest in this possible connection in recent years, spurred largely by the need to understand the natural causes of climate change, against which the expected global warming due to man's activities will have to be detected. The time scale of concern here is that of decades to centuries, and excludes the longer millennial scale in which orbital variations play a dominant role. The field has long been plagued by the lack of an acceptable physical mechanism by which solar variability can affect climate, but the discovery of variability in the Sun's total irradiance (the solar ``constant' of meteorology) by spacecraft instruments has pointed to a direct mechanism. Other less direct mechanisms that have been suggested involve variations in the Sun's ultraviolet flux and in the plasma outflow of the solar wind. The purpose of this paper is to summarize the current state of the field, emphasizing the proposed mechanisms as an introduction to the more detailed papers that follow. The particular case of sea-surface temperature data will be used as an illustration. 相似文献
17.
本文试图说明在喷气发动机上或燃气轮机的进气道内建立聚氧滞氮的流场,增加燃烧室氧的浓度,组织富氧燃烧.提高涡轮前的温度和整机热效率.加大喷气发动机的推力,降低航空煤油耗量,减少喷气尾气对大气的污染.对各种可能的聚氧滞氮的方案进行了初步探索. 相似文献
18.
用隐式多重网格法计算三维粘性流动 总被引:1,自引:0,他引:1
求解高雷诺湍流流动时,边界层法向网格间距较流向和展向相比非常小,因此边界层中存在高度伸缩的网络,这将大大降低多重网格的求解效率。通过谐调的处理多重网格过程的各个细节,既提高了解的精度,又克服了网格展弦比的影响,使得计算效率提高了6~7倍。 相似文献
19.
发展我国农村非正规金融的政策建议 总被引:3,自引:1,他引:3
当前,我国农村非正规金融已形成很大规模,对我国农村经济发展起到了积极的推动作用,同时也带来一定的负面影响。为趋利避害,更好地疏导规范农村非正规金融,从政府角度,应重点做好以下几个方面的工作:首先,对农村非正规金融合理定位,并加强对其规范与管理;其次,要加强对农村正规金融的改革,使其替代部分农村非正规金融;再次,要从法律法规的健全、利率市场化的进程、信用中介组织的建立与农村征信系统建设等诸多方面努力,营造有利于农村非正规金融健康发展的大环境。 相似文献
20.
Pierre Y. Bely Holland C. Ford Richard Burg Larry Petro Rick White John Bally 《Space Science Reviews》1995,74(1-2):101-112
The tropopause, typically at 16 to 18 km altitude at the lower latitudes, dips to 8 km in the polar regions. This makes the cold, dry and nonturbulent lower stratosphere accessible to tethered aerostats. Tethered aerostats can fly as high as 12 km and are extremely reliable, lasting for many years. In contrast to free-flying balloons, they can stay on station for weeks at a time, and payloads can be safely recovered for maintenance and adjustment and relaunched in a matter of hours. We propose to use such a platform, located first in the Arctic (near Fairbanks, Alaska) and, potentially, later in the Antarctic, to operate a new technology 6-meter, diluted aperture telescope with diffraction-limited performance in the near infrared. Thanks to the low ambient temperature (220 K), thermal emission from the optics is of the same order as that of the zodiacal light in the 2 to 3 micron band. Since this wavelength interval is the darkest part of the zodiacal light spectrum from optical wavelengths to 100 microns, the combination of high resolution images and a very dark sky make it the spectral region of choice for observing the redshifted light from galaxies and clusters of galaxies at moderate to high redshifts.Affiliated to the Astrophysics Division, Space Science Department, European Space Agency 相似文献