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《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2003,32(10):1981-1987
In the present work we analyse the magnetic cloud (MC) at 1 AU on 9 November 1997. The appearance of a hotter and dense part (dense filament), with radial extent 106 km, immediately behind the frontal part of the MC, is a distinctive feature of the event. The INTERBALL - Aurora] Probe had a chance to observe field-aligned currents in the mid - altitude magnetosphere during the substorm expansion phase intensification related to the dense filament. We emphasise the appearance of unusual “N”- shape magnetic structure, duration 3 min, amplitude 50 nT between field-aligned current region 1 and the magnetosphere lobe in the late evening hours. To explain some of the MC features we refer to a model scenario of the 6 November 1997 coronal mass ejection. 相似文献
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石英半球谐振陀螺以其轻质、低功耗、长寿命、高可靠、应用精度范围宽、成本低等优势,引起了惯性技术界的瞩目。半球谐振陀螺的核心器件——石英半球谐振子的成型技术是当前的研究重点。经不断试验和摸索,以范成球面弹性展成为基础,通过均衡磨削原则、磨头最大包络原则和三阶段37道工序的精细优化工艺流程,较好地实现了高精度微应力硬脆石英谐振子异形薄壁件的成型,形成了专用的结构成型中心,为石英半球谐振陀螺的核心半球谐振子球壳成型开创了一条可行途径。 相似文献
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鸟撞高速摄影试验与过程研究 总被引:7,自引:0,他引:7
研究鸟撞问题时,一个很关键的问题是鸟撞载荷力学模型的建立.对飞机风挡进行全尺寸鸟撞试验,通过对鸟弹撞击风挡玻璃过程高速摄影、动态应变测量等试验结果的分析,提出了斜撞击过程的鸟撞载荷可以简化为三角形脉冲的简化分析模型,利用该简化载荷模型对风挡玻璃鸟撞进行的有限元分析,结果和试验结果很好地相符. 相似文献
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《Air & Space Europe》2001,3(1-2):45-49
Forecasts of air traffic growth and their interpretation in terms of the requirement for future airport and air traffic system capacity have an important part to play in guiding decisions about transport system design. The complex issues involved are illustrated in this paper, which analyses possible growth scenarios for the particular case of Germany. 相似文献
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《Air & Space Europe》2001,3(3-4):318-320
The Group for Aeronautical Research and Technology in EURope (GARTEUR) was set up with the main aim of facilitating European aeronautics R&T collaboration, covering both the civil and the military applications. Since its creation more than 25 years ago, GARTEUR has conducted numerous collaborative projects. This paper describes briefly the GARTEUR organisation and provides an overview of the scientific and technical activity performed under this umbrella. 相似文献
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《Air & Space Europe》2000,2(5):71-73
The Airbus wide-body aircraft are gradually becoming the aircraft of choice for conversion into freighters. Although the conversions are done by two independent companies who provide the support for their conversion, Airbus Industrie still provides the full support for the basic aircraft. 相似文献
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为了解决冲压发动机被动热防护结构在长时间、狭小空间、大温度梯度下的隔热问题,提出了多层组合梯度隔热方案。通过不同构型的梯度隔热层的氧乙炔实验研究,优化了梯度隔热层的构型,并对优化后的梯度隔热材料的隔热性能进行了冲压发动机试验验证。研究表明:2100K的高温下柔性梯度隔热层具有良好的隔热性能,能够解决狭小空间、大温度梯度条件下,冲压发动机长时间工作的隔热问题;梯度隔热材料的层数影响隔热层的隔热性能,较多的层数可提高柔性梯度材料的整体隔热性能;梯度隔热材料的隔热性能可采用氧乙炔隔热实验进行表征。 相似文献