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正2014年6月16~20日,第12届法国国际地面与防空装备展(下文简称"法国防务展")在法国巴黎戴高乐机场附近的维勒潘特展览中心如期举行。本届展会共吸引了来自58个国家和地区的1 504家参展商,91个国家及国际组织的172个官方代表团应邀出席,5.5万余名专业人士现场观摩、商洽业务,707位新闻记者采访报道了本届展会。法国防务展是全球最大的专业性展会之一,也有新闻媒体将其称为"欧洲萨托利防务展",创办于1992年,是世界一流大型综合性陆军装备展之一,由法国国防部提供赞助、法国地面武器工业协会及其下属负责承办展览 相似文献
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谢建玲 《导弹与航天运载技术》1995,(5)
Internet──世界最大的互联网谢建玲(北京长征科技信息研究所)编者按目前Internet已引起很多人的关心,有许多人在使用它,从本期开始,我们将连续介绍一些Internet的情况,与大家一起浏览这一当今世界最大的信息网络。1概述Internet... 相似文献
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给出用于空空导弹最大发射距离估算的方法和公式, 这种方法建立在利用马赫数倒数拟合零升阻力系数的基础上, 由此得到弹道设计的解析公式, 可以较精确地估算一自由度弹道, 或确定发动机推力特性。给出一个设计的实例, 并与仿真结果进行了比较。 相似文献
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<正>2011年2月17日,澳大利亚皇家海军首艘"堪培拉"级新型多用途两栖攻击舰"堪培拉"号在西班牙纳凡蒂亚造船公司费路尔船厂下水,澳海军两栖战能力由此进入一个新阶段。西太平洋上最大战舰曾经是日本1998年3月服役的"大隅"号(标准排水 相似文献
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对淅开线齿轮齿根曲线进行分析,从而推导出计算齿根曲线最大曲率半径的公式。根据齿轮啮合时有效工作起点,对齿根曲线最大曲率半径给予确定。 相似文献
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<正> 最大动态强度极限,它可表征材料在给定温度下,承受高速载荷时的极限应力。 按上文(见本刊23页—编者注)所述试验方法,将试验材料车出φ12~10×1毫米的圆环试样或加工成直径为1.3~1.5毫米专用试样(见图),应用高速压气枪 相似文献
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最近定义的信息指标用来增强寻的导弹捕获问题的最小控制力弹道的信息量,对于位置信息量加权控制力的性能指标,获得了最优平面拦截弹道。假设导弹和目标的飞行速度不变,用打靶方法计算最优轨迹:但是,因为模型很简单,有可能得到具有信息量增强的制导规律的联机最优化。 相似文献
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在反舰导弹火控系统精度试验中,现有的估计最大瞄准误差方法只局限于单独航次上,而对于多航次的最大误差没有进行估计。本文针对此问题推导了多航次最大误差的理论分布,给出了估计方法。通过误差分析得出该方法的估值精度不依赖于观测数据,故可在满足估值精度的情况下使得试验航次数最少。最后结合一个具体实例给出了最大误差估计值求取的全过程。 相似文献
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可燃气体(或蒸气)最大试验安全间隙值的测定 总被引:1,自引:0,他引:1
提出了测定可燃气体最大试验安全间隙值的测试系统和测定方法,给出了几种可燃气体与空气混合物混合爆炸的最大试验安全间隙数据。所测数据与IEC标准中的推荐数据有较好的可比性。 相似文献
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根据对现有国内外红外空对空导弹的性能数据进行统计,总结出估算红外空对空导弹动力射程的经验公式.该公式用于导弹初步设计和评价国内外空对空导弹的性能是行之有效的.指出采用推力矢量控制技术是提高红外空对空导弹性能的重要技术途径. 相似文献
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用实验研究和理论分析的方法建立了小口径埋头无壳弹在内弹道起始过程中,弹丸侵彻两种结构形状的塑料帽所产生的最大阻力函数模型.用该模型为埋头无壳弹装药所用塑料帽的优化设计提供了理论依据. 相似文献
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Tetraacetyldibenzylhitane (TADBIW) was subjected to debenzylation by nitrosating with inorganic materials available commercially to synthesize tetraacetyldinitrosohexaazaisowurtzitane (TADNSIW). TADNSIW was purified, and its structure was determined by FTIR, 1H NMR, MS and element analysis. The debenzylation reaction of TADBIW gave quantitative benzaldehyde as a by-product. This indicates that the reaction produces an imine cation as an intermediate. Hexanitrohexaazaisowurtzitane (HNIW) was prepared from unpurified TADNSIW with the yield over 96.0 % and the purity more than 98.0 %. And the mechanism of the reaction from TADNSIW to HNIW is proposed to be oxidation of nitroso and nitration of acetyl on the molecule of TADNSIW, This reaction system involved is simple, and the reaction can complete within a short time and under mild conditions. The product can be easily to separate and the waste disposed readily. 相似文献
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The technique of watermarking has been introduced into 2D vector maps for many potential applications such as protecting the copyright of important GIS (geographical information system) data and tracing the data source of military maps. In most previous works, although the validity of the map data could be preserved during the embedding procedure, the shape-distortions of the map elements are usually neglected which would tend to degrade the invisibility of the watermarking schemes. A shape-preserving algorithm for watermarking 2D vector maps is presented in this paper. A 1D distance sequence extracted from the original map is adopted as the cover data instead of 2D coordinates. A watermark bit is represented by changing the distributions of the cover data. The embedding procedure induces lower shape-distortions than in former works. Experimental results indicate better invisibility of the proposed scheme, as well as its robustness to certain attacks such as map simplification, interpolation, additive noise and most geometric transforms. 相似文献
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Open rule-setting method advanced in this paper concentrates on providing designers of engines with a convenient way to express their design innovations and develop the expected prototypes in the early CAD stage, and constitute effective models for the following analysis process of CAE and CAPP. The problems arisen in the process of conceptual design with the traditional experience-based development method are analyzed. Based on those analyses, open rule-setting method is presented and some associated technical problems are discussed. The functional framework of open rule-setting system was built as software engineering methods. The speciality of the engine product as a kind of complex product and the requirement of the engine product based on its structural particularity to rule-setting system are considered carefully. A demonstration is supplied to illustrate how the open rule-setting method enhances the efficiency and quality of the engine conceptual design. 相似文献