氧化铝的直接电镀

讨论了在氧化铝基板上的厚膜应用领域中采取直接电镀的方法。研究了建立在钯涂层、碳涂层和导电聚合物基础上的三种直接电镀的方法，测定和比较了它们与传统电镀／ 化学镀技术的操作步序、电镀速度和膜层结合力等技术指标。     

真空等离子装置的改进设计

利用旧的真空装置改造成一个物理气相沉积设备，不仅节约了大量的资金，而且还为今后的科研工作开辟了一个崭新的领域。本文主要讨论了在改造过程中，根据物理气相沉积的共性以及本实验装置的特定要求和需要注意的几个问题，如一个真空沉积腔的整体结构、密封性和冷却结构，如何有效地利用载物台、励磁电路和点火电路的设计等，提出了改造方案。目前，已成功地将它改造成真空度为１０－ ２τ的低真空等离子沉积装置。     

Solar wind-driven electron radiation belt response functions at 100-min time scales

We present a simple yet numerically robust technique, using autoregressive linear filters, to remove unwanted “colored noise” from solar wind and radiation belt electron data at sub-daily resolution. The remaining signal is then studied using finite impulse response linear prediction filters to represent the driven portion of the linear dynamics that describe the coupling between solar wind speed and electron flux. Sub-daily resolution response profiles covering magnetic L-shells between 1.1 and 8.0 R_E are presented which are consistent with daily resolution response functions. Namely, while there is strong global coherence governing electron flux dynamics, there are at least two distinct responses. The first response is an immediate dropout of electrons between L = 4 and L = 7 that is at least a partly adiabatic effect associated with enhancements in the ring current. This is followed by a 1–2 day delayed enhancement across the same L-shells that is likely a result of increased radial diffusion. The second response is an immediate enhancement seen between L = 3 and L = 4 with a typical duration of less than one day. Plausible explanations for this second response are briefly discussed, but neither empirical nor theoretical evidence can establish conclusively a definite physical cause. Finally, the response profiles show significant solar cycle and seasonal dependencies, indicating that better model output might be achieved with: (1) additional simultaneous solar wind inputs; (2) more sophisticated dynamical model structures capable of incorporating non-linear feedback; and/or (3) time-adaptive linear filters that can track non-stationary dynamics in time.     

喷射沉积Ni3Al基高温合金及其复合材料的显微组织和力学性能

利用喷射沉积技术成功地制备了Ｎｉ－Ａｌ－Ｍｏ系Ｎｉ３Ａｌ基高温合金及其复合材料盘坯，对其显微组织和力学性能进行了测试和分析，并对陶瓷粒子的复合机制进行了初步探讨。     

碳布缝合预制体孔隙与热解碳沉积时变相依的多尺度研究

以甲烷为前驱体,碳布缝合织物为预制体,采用等温化学气相渗透(ICVI)工艺,在1 368 K温度和1 s滞留时间下制备了C/C复合材料。采用压汞仪表征不同致密化时间下预制体的孔隙分布,采用偏光显微镜观察热解碳的结构。结果表明:预制体的孔隙分布呈现多峰分布,热解碳的沉积速率与[A/V]值成反比,热解碳的结构与预制体的比表面积相关,沉积初期比表面积较大时,得到的热解碳织构为各相同性和低织构热解碳,随着沉积的进行,比表面积逐渐减小,在纤维束的边沿等部位出现了高织构热解碳。     

燃油气液比对飞机吸力供油的影响研究

吸力供油是民用飞机燃油系统的基本功能,燃油气液状态是影响吸力供油能力的关键性因素。以某型飞机为例,通过严格的试验方法,对吸力供油能力进行了验证,并以试验数据为基础,对燃油气液比进行计算,分析了其产生的影响。研究结果可用于指导飞机燃油系统设计和发动机性能评定。     

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.     

NOx羽烟引起的局部电离层电子密度扰动

通过空间飞行器抛出羽烟的球状近似，研究白天ＮＯ和ＮＯ２羽烟在Ｅ层的扩散，光化学过程及它们对电子密度的影响。由于光致电离和郭解复合反应，抛出的ＮＯ羽烟在Ｅ层造成电子密度最大７．５倍的瞬时增加，而ＮＯ２羽烟可以使Ｅ层下部电子密度瞬时升高达２４倍。     

Retrieval of the change of precipitable water vapor with zenith tropospheric delay in the Chinese mainland

As a preliminary step for assessing the impact of global positioning system (GPS) refractive delay data in numerical weather prediction (NWP) models, the GPS zenith tropospheric delays (ZTD) are analyzed from 28 permanent GPS sites in the Chinese mainland. The objectives are to estimate the GPS ZTD and their variability in this area. The differences between radiosonde precipitable water vapor (PWV) and GPS PWV have a standard deviation of 4 mm in delay, a bias of 0.24 mm in delay, and a correlation coefficient of 0.94. The correlation between GPS ZTD and radiosonde PWV amounts to 0.89, indicating that the variety of tropospheric zenith delay can reflect the change of precipitable water vapor. The good agreement also guarantees that the information provided by GPS will benefit the NWP models. The time series of GPS ZTD, which were derived continuously from 2002 to 2004, are used to analyze the change of precipitable water vapor in Chinese mainland. It shows that the general trend of GPS ZTD is diminishing from the south-east coastland to the north-west inland, which is in accordance with the distribution of Chinese annual amount of rainfall. The temporal distribution of GPS ZTD in the Chinese mainland is that the GPS ZTD reaches maximum in summer, and it reaches minimum in winter. The long term differences between the observational data sources require further study before GPS derived data become useful for climate studies.     

Simultaneous observations of the plasma density on the same field line by the CPMN ground magnetometers and the Cluster satellites

By applying the cross-phase method and the amplitude-ratio method to magnetic field data obtained from two ground stations located close to each other, we can determine the frequency of the field line resonance (FLR), or the field line eigenfrequency, for the field line running through the midpoint of the two stations. From thus identified FLR frequency we can estimate the equatorial plasma mass density (ρ)$(\rho )$ by using the T05s magnetospheric field model [Tsyganenko, N.A., Sitnov, M.I. Modeling the dynamics of the inner magnetosphere during strong geomagnetic storms, J. Geophys. Res. 110, A03208, 2005] and the equation of Singer et al. [Singer, H.J., Southwood, D.J., Walker, R.J., Kivelson, M.G. Alfven wave resonances in a realistic magnetospheric magnetic field geometry, J. Geophys. Res. 86 (A6) 4589–4596, 1981].