高功率微波导弹发展现状分析研究

简要介绍了高功率微波武器的概念、毁伤机理、基本特点,对高功率微波武器的发展脉络进行了梳理.重点介绍了美国CHAMP高功率微波导弹的发展情况,对其可能的应用情况进行了探讨.     

Cut-off features in interplanetary solar radio type IV emission

Solar radio type IV bursts can sometimes show directivity, so that no burst is observed when the source region in located far from the solar disk center. This has recently been verified also from space observations, at decameter wavelengths, using a 3D-view to the Sun with STEREO and Wind satellites. It is unclear whether the directivity is caused by the emission mechanism, by reduced radio wave formation toward certain directions, or by absorption/blocking of radio waves along the line of sight. We present here observations of three type IV burst events that occurred on 23, 25, and 29 July 2004, and originated from the same active region. The source location of the first event was near the solar disk center and in the third event near the west limb. Our analysis shows that in the last two events the type IV bursts experienced partial cut-offs in their emission, that coincided with the appearance of shock-related type II bursts. The type II bursts were formed at the flanks and leading fronts of propagating coronal mass ejections (CMEs). These events support the suggestion of absorption toward directions where the type II shock regions are located.     

Use of coated silicon field emitters as neutralisers for fundamental physics space missions

Spacecraft neutralisers are required as part of the ion propulsion system for accurate station keeping in fundamental physics missions. This paper describes the use of thin layers of insulating materials as coatings for the gated silicon field emitter array structure used in a spacecraft neutraliser. These thin coatings are postulated to reduce power consumption and reduce overheating. The power consumption and lifetime of aluminium nitride and amorphous hydrogenated diamond-like carbon coatings have been tested by current–voltage and endurance tests. Diamond-like carbon coatings were promising, performing better in endurance tests than uncoated samples, but further work is required to characterise the coating’s physical properties and its effects on field emission. The thermal conductivity of the coating material had little effect on measured sample lifetimes. Aluminium nitride had reduced power consumption compared to diamond-like carbon coated and uncoated samples. A thin (∼5 nm) layer of aluminium nitride was found to be optimal, meeting European Space Agency specifications for the neutraliser engineering model.     

超高强度钢不同性质缺陷的声发射特性研究

研究了超高强度钢30Si2MnCrMoVE的声发射特性,针对裂纹、夹钨、未焊透等几种常见焊接缺陷的声发射数据进行了分析,为相关产品的声发射检测结果评定提供参考,以此提高声发射技术在超高强度钢产品质量检测上的可靠性。     

电子束横波器件原理及应用

几十年前,前苏联成功研制了一系列电子束横波器件,其主要优点是线性、高效率和自保护。这些器件已在微波输电、雷达和通信中获得应用。文章对它们的结构、工作原理和技术参数等进行简要介绍。     

低温点源黑体关键技术及国内外发展现状

文章分析了低温点源黑体设备研制中的几项关键技术,包括3种常见发射腔腔形的特点,腔体发射率的计算方法,以及热管,恒温浴和液氮电加热3种恒温方式的原理和技术特性;比较了国内外典型低温黑体设备、产品的性能指标;并简述低温点源黑体设备在红外定标试验中的原理和应用.最后总结出现阶段低温点源黑体的发展水平以及未来的研究重点.     

一种微波功率放大器的热设计与验证方法

大功率、高热流密度微波功率放大器是环境监测有效载荷中的关键设备,对整星的热设计影响很大.功率放大器的热设计的目的是满足温度需要,从而确保功率放大器的安全可靠工作.文章在完成热设计的基础上,确定热控设计方案,对功率放大器进行了热试验.试验结果表明,热设计可以满足要求.     

正激波后OH A~2∑~+──X~2∏瞬态光谱的测量

用光学多道分析仪（OMA光学系统）测量了氢氧燃烧驱动激波管中典型状态下正激波后高温空气不同时刻的瞬态光谱。光谱结果显示高温空气的光谱中有很强的OHA2∑＋─X2∏光谱。通过采用线线合成光谱的方法得到激波后不同时刻高温空气中OH分子的转动温度。     

Limb Viewing Hyper Spectral Imager (LiVHySI) for airglow measurements onboard YOUTHSAT-1

The Limb Viewing Hyper Spectral Imager (LiVHySI) is one of the Indian payloads onboard YOUTHSAT (inclination 98.73°, apogee 817 km) launched in April, 2011. The Hyper-spectral imager has been operated in Earth’s limb viewing mode to measure airglow emissions in the spectral range 550–900 nm, from terrestrial upper atmosphere (i.e. 80 km altitude and above) with a line-of-sight range of about 3200 km. The altitude coverage is about 500 km with command selectable lowest altitude. This imaging spectrometer employs a Linearly Variable Filter (LVF) to generate the spectrum and an Active Pixel Sensor (APS) area array of 256 × 512 pixels, placed in close proximity of the LVF as detector. The spectral sampling is done at 1.06 nm interval. The optics used is an eight element f/2 telecentric lens system with 80 mm effective focal length. The detector is aligned with respect to the LVF such that its 512 pixel dimension covers the spectral range. The radiometric sensitivity of the imager is about 20 Rayleigh at noise floor through the signal integration for 10 s at wavelength 630 nm. The imager is being operated during the eclipsed portion of satellite orbits. The integration in the time/spatial domain could be chosen depending upon the season, solar and geomagnetic activity and/or specific target area. This paper primarily aims at describing LiVHySI, its in-orbit operations, quality, potential of the data and its first observations. The images reveal the thermospheric airglow at 630 nm to be the most prominent. These first LiVHySI observations carried out on the night of 21st April, 2011 are presented here, while the variability exhibited by the thermospheric nightglow at O(¹D) 630 nm has been described in detail.     

Behavior of the atomic oxygen 557.7 nm atmospheric emission in the solar cycle 23

We present the results of nightglow observation of the atomic oxygen 557.7 nm line emission in the solar cycle 23. We use the experimental data obtained at Geophysical observatory near Irkutsk (52°N, 103°E), Russia, for the 1997–2006 period. The 557.7 nm emission observations data are compared with atmospheric and solar parameters. We note a difference in correlation coefficients between the 557.7 nm emission intensity and the solar activity indices in different phases of the solar cycle. Airglow observation results are compared with the observational data obtained by other authors.