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等离子体隐身技术浅析 总被引:1,自引:0,他引:1
关于等离子体对雷达波的隐身机理,等离子体的红外及可见光隐身,等离子体天线,飞行器用等离子体火花杆,等离子体喷枪等问题,本文作了初步探讨。这对开展等离子体隐身技术的进一步研究是必要的,也可能是有帮助的。 相似文献
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不均匀非磁化等离子体柱的ZTFDTD分析 总被引:1,自引:0,他引:1
推导出了一种归一化的Z变换FDTD算法(ZTFDTD),将这种方法用于仿真电磁波与非磁化等离子体的相互作用的研究中,给出了非磁化等离子体的FDTD迭代公式.通过二雏模型分别仿真了在不同等离子体自由电子密度分布下等离子体柱对同一频率电磁波的折射作用、相同自由电子密度分布下等离子体柱对不同频率电磁渡的折射作用,以及在不同电磁波频率和等离子体碰撞频率下,非磁化等离子体柱对电磁波的折射和碰撞吸收作用.数值结果表明,等离子体隐身在理论上是有效可行的,合理地设置等离子体参数,可以极大地增强等离子体隐身效果. 相似文献
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等离子体对于高功率微波的攻击具有独特的防护效果。基于等离子体流体近似方法,利用COMSOL软件研究了高功率微波与柱状等离子体阵列相互作用过程中入射电场随时间的演变过程,分析了等离子体防护高功率微波的物理过程和作用机理。研究结果表明,入射的高功率微波会使等离子体参数发生剧烈变化,特别是其电子密度将急剧增加,从而使等离子体对入射的高功率微波表现出类似金属的电磁特性,最终实现对入射高功率微波的有效防护。此外,利用高频辉光放电产生柱状等离子体阵列,通过实验验证了等离子体对高功率微波的防护作用。最后,总结了基于等离子体的高功率微波防护技术需解决的主要问题。 相似文献
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介绍和分析了几种等离子体微波器件中等离子体源,重点讨论了紧凑型氢等离子体枪的设计及其驱动电路。 相似文献
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Si C光学材料具有高化学稳定性,其在普通的等离子体加工中难以获得较高的加工效率。在等离子体加工实验中,发现提高等离子体的自身射频电压可增强等离子体与Si C材料之间的电弧放电作用,而借助电弧的增强作用可提高Si C材料的加工效率,因此提出电弧增强等离子体加工方法。为研究电弧的形成原理,使用自制的探针分别测量了普通电感耦合等离子体和电弧增强等离子体的电压。分别使用传统方法和电弧增强方法对S-Si C进行直线扫描加工实验,证明了电弧增强等离子体加工方法具有更高的加工效率。 相似文献
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由于SiC光学材料具有高化学稳定性,使其在普通的等离子体加工中难以获得较高的加工效率。在等离子体加工实验中,我们发现提高等离子体的自身射频电压,可增强等离子体与SiC材料之间的电弧放电作用,而借助电弧的增强作用提高SiC材料的加工效率,因此本文提出了电弧增强等离子体加工方法。为研究电弧的形成原理,本文使用自制的探针分别测量了普通电感耦合等离子体和电弧增强等离子体的电压。并分别使用传统方法和电弧增强方法对S-SiC进行直线扫描加工实验,证明了电弧增强等离子加工方法在加工过程中具有更高的加工效率。 相似文献
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George R. Fitzpatrick Jerome Bracken Mary J. O'brien Lee G. Wentling Justin C. Whiton 《海军后勤学研究》1967,14(2):241-255
A linear programming model for analyzing the strategic deployment mix of airlift and sealift forces and prepositioning to accomplish the composite requirements of a set of possible contingencies is described in this paper. It solves for the least-cost mix of deployment means capable of meeting any one of a spectrum of contingencies, or meeting simultaneous contingencies. The model was developed by RAC as part of the U.S. Army's study program and has been used in analyses of deployment systems conducted in support of the U.S. Army, the Joint Chiefs of Staff and the Office of the Secretary of Defense. Results of analyses have influenced the preparation of long-range plans as well as the formulation of the FY67 Department of Defense budget. The paper gives the background and assumptions of the model, describes the model by means of a simple hypothetical example followed by a selected subset of a complete version, and discusses how the model is used. 相似文献
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测定了溶胀的PPU/PSAB 交联聚合物中链段和侧基的13CT1和NOE ,用VJGM模型和三等价位跃迁内旋转、扩散内旋转以及等价、不等价两位置跃迁内旋转模型分析了其中的主链链段运动和侧基内旋转运动 ,求出了主链和侧基的运动相关时间、扩散系数和活化能等参数 .结果表明PS含量对PPU运动的影响极小 ,PS主链运动活化能与PPU含量存在线性关系 .丙烯酸与苯乙烯共聚对PPU的运动几乎无影响 相似文献
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Shameer Modongal 《Defense & Security Analysis》2016,32(4):354-360
Stability among the great powers during the Cold War is widely theorized in terms of nuclear deterrence. Rationality of states and their preference for survival are the basis of nuclear deterrence. The rationality of non-state terrorist groups is different from that of nation-states. Even though they are also rational actors with their own hierarchy of preferences, survival may not be their ultimate goal. Deterrence of nuclear terrorism is therefore different from deterrence against states. South Asia is more vulnerable to nuclear terrorism than any other region of the world for many reasons. This article analyzes the possibility of nuclear terrorism and the ways of deterrence against it in the context of South Asia. 相似文献
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This paper describes a method of solving aircraft service life problems. The particular application concerns aircraft in the Naval Advanced Jet Training Command. The method of solution is comparative present value analysis of alternative replacement policies. The likely risks of estimation errors are reflected in the comparisons of present values. Differences are noted in the benefits associated with each policy, but external to Naval Aviation. Since the values of these benefits can be determined only at a higher level of decision-making, the result of the study is not a conclusive selection among policies, but a schedule of present values on the basis of which, together with values of the external benefits, a decision can be reached. This paper discusses replacement policies for aircraft used in the Naval Advanced Jet Pilot Training mission. Taking engineering technology and the training syllabus as given, four feasible plans for introducing replacement aircraft into service are evaluated in terms of the present values of differential costs associated with the plans and in terms of the likely errors in cost estimates used in calculation of the present values. The trade-off between present value of costs and planning flexibility is emphasized in choosing a recommended time pattern of aircraft replacement. The specific aircraft mixes considered are the TF–9J/TAF–9J and the TA–4F/A–4B. The first is the currently employed mix; the second is the proposed replacement. The problem is to select an optimal time-pattern of replacement of F–9's by A–4's, given technological differences favoring the A–4 and increasing costs of maintaining squadrons of F–9's. Replacements by aircraft types other than the A–4 are considered impractical. Four feasible plans for introducing A–4's through a 5-year period are evaluated in terms of current best estimates of the related costs of the plans and in terms of the flexibility of modifying each plan given future better information concerning the relevant costs. The method of analysis is comparative present value of expected costs. 相似文献
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军事刑法是普通刑法的特别法,因而,刑法的一般原则对军事刑法具有当然的指导意义,但是这些原则在军事刑法中会有特殊的体现。军事刑法保护的是国防利益、国家军事利益。但是,为了保护国防利益、国家军事利益而不当的牺牲个人权利是罪刑法定原则不允许的。法律面前人人平等原则要求,对任何人犯罪,在适用法律上一律平等。但是,由于军人具有特殊的身分,刑法对军人和非军人加以区别对待。罪刑相适应原则要求,刑罚的轻重,应当与犯罪分子所犯罪行和承担的刑事责任相适应。战时缓刑是刑罚个别化原则在军事刑法中的体现。 相似文献