共查询到20条相似文献,搜索用时 93 毫秒
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利用ANSYS软件研究了组件式热阴极与非组件式热阴极在阴极温度分布和启动时间等特性上的异同,并与实验结果进行对比。结果表明:组件与非组件式结构的阴极表面温度分布都十分均匀,组件式阴极钼筒外表面的温差与热子输入功率成正比;组件式阴极的钼筒外温度、阴极温度高于非组件式的,而热子温度明显低于非组件式的,但非组件式阴极启动更快;非组件式阴极通过增加阴极下表面发射率可以显著升高阴极温度,增加热子发射率可以显著降低热子温度,从而热性能也能达到与组件式阴极相近水准。 相似文献
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简述了软件无线电波形及波形组件,分析了SCA波形软件装配描述文件SAD,提出了一种基于软件通信体系结构和波形组件管理器的组件动态部署方法,并设计实现了组件管理器;使用组件管理器为组件的创建和部署提供统一接口,为波形组件的动态部署操作提供灵活方便的通用接口实现;以宽带网络波形为例,在vxWorks下进行了波形组件的部署试验;结果表明,该方法可以满足SCA波形组件的动态创建和部署要求,解决了波形组件的创建和部署操作与其它操作夹杂在一起,耦合度高的问题,从而提高了组件的可重用性、可移植性和可维护性。 相似文献
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描述了量子阱640×480低温红外探测器用IDCA组件的研制和集成,包括斯特林制冷机的选择、杜瓦的设计、芯片封装和组件的试验结果与分析,组件可靠性设计,给出了量子阱640×480用IDCA组件的主要性能参数。 相似文献
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在压水堆核电站中,由于燃料组件装配的压紧力、冷却剂流动、辐射蠕变、燃耗等因素会导致燃料组件的弯曲,燃料组件的弯曲对组件间的水隙分布产生影响,从而影响中子的慢化行为及堆芯的传热性能,进而对反应堆堆芯的运行参数造成影响。本文分析了组件弯曲的成因及机理、影响及后果(包括对堆芯功率分布、径向功率倾斜、焓升因子、热点因子等参数的影响),并使用蒙特卡罗软件JMCT,对组件弯曲的确定论计算程序的正确性进行了验证。最后通过确定论的计算程序模块,对CPR1000核电站的组件弯曲情况进行了模拟分析,计算结果表明:在某一燃耗下,随着水隙增加或减小,燃料组件功率会随之增加或减小,使堆芯的功率分布发生倾斜,影响核电站的安全运行。 相似文献
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描述了PtS i512×512CCD红外探测器用集成式杜瓦和斯特林制冷机组件的集成,包括斯特林制冷机的选择、集成杜瓦的设计、芯片封装和组件的试验结果与分析,组件可靠性设计和考核,并给出了PtS i512×512CCD用ID-CA组件的性能参数。 相似文献
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Zhi-Bo Yang Jin-Song Liu Ai-Dong Zhu Hong-Yu Liu Rong-Can Yang 《Annalen der Physik》2020,532(9):2000196
This study presents nonreciprocal transmission and nonreciprocal magnon–phonon entanglement in a spinning microwave magnomechanical system. This system consists of microwave photons, magnon modes, and phonons. These are created by the vibrational mode of a yttrium iron garnet sphere. This investigation reveals that nonreciprocity is caused by the light that is circulating in a resonator that is experiencing a Fizeau shift. This leads to a difference in the effective detuning frequency of the photon for forwarding and backward drives. A super-strong transmission isolation rate (>100 dB) and a strong entanglement isolation rate (≈50 dB) are obtained by applying the experimental parameters. This scheme opens a new route for exploiting a variety of nonreciprocal effects, and it provides the theoretical basis for the design and realization of magnetically controllable isolators and diodes. 相似文献
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Optical homodyne receivers based on modified Dither Optical Phase-Locked Loop is analyzed taking into account the laser phase noise, photo detectors shot noise and the dither signal. This modified loop contains all the components of a standard Dither OPLL in conjunction of an additional phase modulator. This modified loop considerably improves the performance of the homodyne reception technique over the earlier technique with the help of commercially available external cavity lasers with line-width of about few hundred kHz. This modified dither OPLL seems a realistic approach for receiving modulated signal for inter-satellite communication systems. This modified technique provides the advantage of low weight, small size and above low cost because the proposed technique significantly reduces the requirement of very narrow line-width lasers. This modified dither loop shows good improvements in the reduction performance over previously reported methods, like, less system power penalty, relaxed line-width requirement. 相似文献
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This paper proposes a scheme for information concentration of two remote two-level
atoms in cavity QED. This scheme does not involve the Bell-state measurement. During
the interaction between atom and cavity, the cavity frequency is large-detuned from
the atomic transition frequency, thus the scheme is insensitive to both the cavity
decay and the thermal field. This idea can directly be generalized in the case of
multi-atom information concentration. 相似文献
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一种新型同步摄影控制系统 总被引:1,自引:1,他引:0
本文介绍了一种新型同步摄影控制系统,它应用具有良好瞬态响应的速度控制和具有较为理想特性的鉴频鉴相技术,大大地缩短了频率牵引过程,使系统快速地进入相位锁定区域,实现了高的同步摄影精度、宽的同步摄影频率范围、短的同步时间,使同步摄影控制系统性能有较大的提高。 本文介绍了该系统的设计思想、控制系统电路、系统性能。该系统已成功地应用于靶场中。系统结构简单,工作稳定可靠,有一定的实用价值。 相似文献
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This paper talks about a new conservation law in non-Kerr law media. This new integral of motion is used to provide an equation for the phase of the soliton. This law is also used to obtain the adiabatic variation of the soliton phase due to perturbation terms in a non-Kerr law media that includes the power law, parabolic law and the dual-power law. 相似文献
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多功能向心力测量转台应用控制变量法,实现对向心力规律的全面定量探究;也可用于"弯道受力分析、滚桶脱水、柱形墙内的水平圆周运动、法拉第电磁感应定律"等典型物理问题的教学.装置采用变频电源驱动同步电动机的方式来实现匀速转动,调速和计速一步到位,无需电磁或光电门测速装置;利用手持电子秤代替弹簧秤或拉力传感器,从而免去了DIS... 相似文献
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In detecting particles on a substrate, two-white-spots phenomenon was observed. This gives an illusion that light scattering is caused by two spheres, in fact it is just caused by one sphere. This phenomenon makes particle detection by light scattering much more complicated. Analysis on this phenomenon shows that Mie effect is the reason of formation of two white spots. This experiment demonstrates the images of Mie effect, and provides a strong evidence of theory of Mie effect. 相似文献
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This paper presents the spectral emission and saturation properties of a Lumilass G9 fluorescence glass excited using a 157 nm laser emitting ∼10 ns duration pulses. This fluorescence glass can be applied in conjunction with a CCD array for beam profiling and divergence measurements. This method can also be used for deriving information on the spatial coherence function of the F2 laser. This constitutes one of the major contributions of the paper and is also discussed. 相似文献