飞机复合材料修理中固化技术的探讨

对飞机复合材料固化工艺中热固化、微波固化、电子束固化、紫外光固化等技术的机理和研究现状进行了分析对比。     

高精度紫外探测器定标测试方法

文章研究分析了紫外电学定标探测器的主要光电不等效因素,并建立了基于紫外电学定标探测器的紫外辐射定标系统。在此基础上,利用紫外探测器定标测试平台,开展了紫外探测器的测试方法研究,响应率定标的总不确定度为3%～5%,相对光谱测试的总不确定度为3%。     

Method of the HF wave absorption evaluation based on GIRO network data

High frequency (HF) communication is strongly dependent on the state of the ionosphere, which specifies the mode structure of the radio wave propagating in ionosphere. Another core factor defining the strength of the HF signal at the receiving site is the ionospheric absorption. Accurate modelling the effect of absorption is an essential part of many studies of the HF propagation in the ionosphere.This paper proposes a method for estimating the absorption. The method is based on analysis of vertical sounding ionograms. The main idea of the approach is to compare the main parameters retrieved from measured and simulated ionograms. The combination of Global Ionospheric Radio Observatory (GIRO, http://giro.uml.edu) data and ionograms modelling allows for developing the empiric absorption model available at near real-time. The ionogram simulation taking into account absorption utilizes the NIM-RT (North Ionospheric Model and Ray Tracing) software. As a result, the proposed technique provides more reliable and accurate evaluation of minimum frequency at which echoes are observed in vertical incidence ionosonde soundings. The values of these frequencies should be used in the following simulation to optimize parameters in the empirical formulae for defining absorption HF wave in ionosphere.The ultimate objective of this work is the designing the method, which allows the simulating of HF radio channel accounting for regular absorption due to UV radiation of the Sun. Eventually it could be considered as some kind of the HF propagation forecasting.     

基于虚拟仪器的空靶通用测试系统的研究

针对空中靶标测试设备现状和问题,提出了一种基于虚拟仪器的新型空靶通用化测试系统,研究了其总体结构和功能特点, 讨论了系统软件体系结构和开发设计。     

防原子氧与抗辐射环境薄膜性能研究

金属氧化物薄膜具有良好的光学,电学特性,因此是卫星表面热控材料防静电积累的重要材料之一。实验研究发现这些金属氧化物薄膜还是具有优良的防原子氧和抗空间辐照环境的能力,而且这种能力与成膜方法及工艺过程直接相关。经模拟原子氧环境的氧等离子体作用后,溅射镀氧化锡样品的质损明显小于蒸镀氧化铟锡薄膜的质损,而氧化铟锡薄膜的质损又小于未镀薄膜试样质损。     

Galaxy evolution in groups. USGC U268 and USGC U376 in the Leo cloud

With the aim of investigating galaxy evolution in nearby galaxy groups, we analyzed the spectral energy distribution of 24 galaxies, members of two groups in the Leo cloud, USGC U268 and USGC U376. We estimated the ages and stellar masses of the galaxies by fitting their total apparent magnitudes from far-ultraviolet to near-infrared with population synthesis models. The comparison of the results for a subsample of galaxies with smooth particle hydrodynamic (SPH) simulations with chemo-photometric implementation, shows that in most cases the estimated stellar masses obtained with the two different approaches are in good agreement. The kinematical and dynamical analysis indicates that USGC U268 is in a pre-virial collapse phase while USGC U376 is likely in a more evolved phase towards virialization.     

地月转移轨道自主导航算法研究

本文给出一种地月转移段的自主导航算法。以紫外敏感器输出的月心像素和月心距等信息为观测量,利用基于UD分解的扩展卡尔曼滤波算法确定探测器的轨道。仿真结果表明,基于紫外敏感器的地月转移段自主导航是可行的,引入单程多普勒测速的组合导航算法可以有效地提高导航精度与收敛速度。     

主成分估计的发展和完善及其在制导工具误差分离中的应用

本丈针对制导工具误差模型的特点,对[4]的主成分估计法作了深入的理论研究,发展和完善了[4]的方法,得到了一种适用于制导工具误差系数分离的方法。     

紫外辐照下透明聚氨酯胶片老化机理

针对高端夹层玻璃的老化问题,选用荧光紫外灯,对其主要粘结材料——透明聚氨酯胶片分别进行0/200/300/500 h的照射,借助紫外/可见光分光光度计、傅里叶红外光谱仪、扫描电镜等设备,研究照射过程中材料颜色、结构、微观形貌的变化。扫描电镜显示照射时间延长到500 h,材料表面出现龟裂。实验发现胶片的老化起始于硬段及软段部位与N,O相连的α位置的碳原子,在紫外光及氧气的联合作用下产生氢过氧化物;该过氧化合物一部分继续氧化成CO,一部分通过β分裂,使C—N,C—O键断裂,致使材料龟裂。     

压力传感器单电源调理电路技术研究

对单电源供电的压力传感器调试中出现零位输出较大且存在相应死区的问题,进行了理论分析,找出了问题原因,采取了有效的解决措施,为传感器产品化和产业化奠定了基础。