The Far Ultra-Violet Imager on the Icon Mission

ICON Far UltraViolet (FUV) imager contributes to the ICON science objectives by providing remote sensing measurements of the daytime and nighttime atmosphere/ionosphere. During sunlit atmospheric conditions, ICON FUV images the limb altitude profile in the shortwave (SW) band at 135.6 nm and the longwave (LW) band at 157 nm perpendicular to the satellite motion to retrieve the atmospheric O/N₂ ratio. In conditions of atmospheric darkness, ICON FUV measures the 135.6 nm recombination emission of \(\mathrm{O}^{+}\) ions used to compute the nighttime ionospheric altitude distribution. ICON Far UltraViolet (FUV) imager is a Czerny–Turner design Spectrographic Imager with two exit slits and corresponding back imager cameras that produce two independent images in separate wavelength bands on two detectors. All observations will be processed as limb altitude profiles. In addition, the ionospheric 135.6 nm data will be processed as longitude and latitude spatial maps to obtain images of ion distributions around regions of equatorial spread F. The ICON FUV optic axis is pointed 20 degrees below local horizontal and has a steering mirror that allows the field of view to be steered up to 30 degrees forward and aft, to keep the local magnetic meridian in the field of view. The detectors are micro channel plate (MCP) intensified FUV tubes with the phosphor fiber-optically coupled to Charge Coupled Devices (CCDs). The dual stack MCP-s amplify the photoelectron signals to overcome the CCD noise and the rapidly scanned frames are co-added to digitally create 12-second integrated images. Digital on-board signal processing is used to compensate for geometric distortion and satellite motion and to achieve data compression. The instrument was originally aligned in visible light by using a special grating and visible cameras. Final alignment, functional and environmental testing and calibration were performed in a large vacuum chamber with a UV source. The test and calibration program showed that ICON FUV meets its design requirements and is ready to be launched on the ICON spacecraft.     

Earthshine and Asteroseismology Telescope (East) Network

Several automated optical telescopes have been setup at appropriate longitudes around the globe to study earthshine variations and asteroseismology. The first telescope has been setup at Teide Observatory, Tenerife, Spain in October 2004. The intensity of earthshine relates to the average of Earth’s albedo, and in turn relates to the global temperature of the Earth. A global network is necessary because each site can measure the earthshine reflected from only a part of the Earth. The network will also be used for asteroseismology study. It can measure photometric variations of pulsating stars. The long-term and continuous measurements allow the accurate determination of mode frequencies of stellar pulsations, which provides information on the properties of stellar interior.     

超燃冲压发动机研究综述

超燃冲压发动机技术是一项新型的、具有广阔发展前景的推进技术。本文对国内外超燃冲压发动机最新研制情况进行了综述，重点论述了该类发动机关键技术研究情况，并对关键技术研究及思路提出了几点建议。     

纤维复合材料的形变功密度断裂准则

通过单边缺口、中心裂纹和中心圆孔碳/环氧和玻璃/环氧复合材料层合板试样的试验证实,在考虑了材料的各向异性后,把各向同性材料的J积分分析结果用于确定复合材料层合板的断裂过程区特征长度d₀是适宜的。 根据碳/环氧复合材料层合板的有限元分析结果和试验观察,提出了一个新的断裂准则 σ_y（d0,0）ε_y（d0,0）=ασ_Fε_F 称为形变功密度断裂准则。这个准则已得到试验验证。使用本文方法可以得出不随试样几何形状和应力分布而变化的特征长度。     

Development and verification of an innovative photomultiplier calibration system with a 10-fold increase in photometer resolution

In this study, we construct a photomultiplier calibration system. This calibration system can help scientists measuring and establishing the characteristic curve of the photon count versus light intensity. The system uses an innovative 10-fold optical attenuator to enable an optical power meter to calibrate photomultiplier tubes which have the resolution being much greater than that of the optical power meter. A simulation is firstly conducted to validate the feasibility of the system, and then the system construction, including optical design, circuit design, and software algorithm, is realized. The simulation generally agrees with measurement data of the constructed system, which are further used to establish the characteristic curve of the photon count versus light intensity.     

固体火箭发动机燃烧不稳定性预估

本文以Culick线性理论为基础,提出预估固体火箭发动机燃烧不稳定性的方法,并给出一个算例.讨论了提高微粒阻尼预估精度和考虑平均流动影响的问题.首次提出用统计方法评定燃烧不稳定性、给出发生燃烧不稳定概率的方法,并讨论了这种统计方法的合理性和可行性.     

空间科学实验机器人辅助遥操作系统

建立了一个面向空间舱内晶体生长科学实验的地面模拟机器人遥操作系统。该系统通过基于虚拟现实的预测仿真来克服通讯时延的影响，并通过仿真图形和实际视频图像的叠加来对虚似仿真环境进行校准，以提高预测仿真的保真性。操作员利用空间鼠标等人机交互工具实时控制仿真机器人系统的运动，通过遥控与自主相结合的方式，并借助全局和局部视觉信息，完成了在空间晶体生长科学实验中更换晶体炉料棒的作业任务。     

SIS/LPB/PAn导电橡胶复合物

采用原位聚合法,在SIS(苯乙烯-异戊二烯-苯乙烯嵌段共聚物)/LPB(液体聚丁二烯)橡胶基体中合成PAn(聚苯胺),形成单面导电的导电橡胶复合物.研究了基体聚合物交联度、苯胺、氧化剂用量和聚合反应时间等几种主要反应条件对复合物导电性的影响.导电层中PAn含量只有6.1%,导电面电导率就可达5.5S/m.该复合物的电导率:①随基体聚合物的交联度的增大而减小;②随苯胺用量的增大而增大;③随氧化剂用量的增大先增大后减小.      

快速计算虚拟物体之间精确接触位置的算法

在触觉、力觉交互的虚拟现实系统中,快速计算虚拟物体之间精确接触位置是触觉、力觉交互碰撞检测系统的前提.在这样的系统中虚拟物体大多是多面体模型且是三角形模型,采用层次包围盒法判断物体是否相交,如果相交,采用本文提出的二级检测算法快速计算出物体的接触位置.该算法首先判断那些相交三角形是异面还是同面,如果是异面,求出一个三角形T₂与另外一个三角形T₁所在平面的交线,然后再判断该交线与T₁之间的位置关系,进而求出有效的相交线段;如果是同面,需要判断两个三角形之间相互位置关系,然后有针对性地求出相关线段之间的交点,从而求出三角形的相交区域.最后用实例验证了该算法的有效性和鲁棒性.     

一种基于数据融合的加速度传感器的静态模型辨识方法

通过对现有加速度传感器静态模型参数辨识方法进行分析,指出传统的算术平均值法在实现加速度传感器静态模型参数辨识中存在的缺陷,提出了数据融合方法,并对其进行了讨论。数据融合方法是将来自同一目标的多源数据加以智能化合成,从而产生比单一数据源更精确更完全的估计和判决。通过分析表明,采用数据融合方法进行参数辨识得到的参数的离散度小于传统的算术平均值法所求参数的离散度,使模型参数的精度有明显提高。因此数据融合方法优于传统的算术平均值法,特别适合于加速度传感器静态模型参数的辨识。该方法的提出为控制系统的实时补偿提供了良好的条件。