航空类院校人文环境的构建

航空类院校是高等教育的重要组成部分,随着当前我国航空产业的不断发展,航空类院校的重要地位更加凸显。富有自身特色的人文环境的构建关乎航空院校培养全面发展的人才。     

An overview of RADOM results for earth and moon radiation environment on Chandrayaan-1 satellite

The RADiatiOn Monitor (RADOM) is a miniature dosimeter-spectrometer that flew onboard the Chandrayaan-1 lunar mission in order to monitor the local radiation environment. Primary objective of the RADOM experiment was to measure the total absorbed dose, flux of surrounding energetic particles and spectrum of the deposited energy from high energy particles both en-route and in lunar orbit. RADOM was the first experiment to be switched on after the launch of Chandrayaan-1 and was operational until the end of the mission. This paper summarizes the observations carried out by RADOM during the entire life time (22 October 2008–31 August 2009) of the Chandrayaan-1 mission and compares the measurement by RADOM with the radiation belt models such as AP-8, AE-8 and CRRESS.     

火箭整流罩声振环境缩比特性研究

针对火箭整流罩全尺寸声振环境试验过程中难度大、成本高的问题，通过量纲分析的方法建立了缩比模型的相似准则，研究并获得了缩比模型与原模型之间内部声场、壁面振动加速度的关系，并使用声学有限元方法(FEM)进行了仿真计算。仿真结果表明，缩比模型与原模型场点处声压级相吻合，壁面振动加速度成一定的比例关系，符合缩比准则结果。该方法为火箭整流罩的声振环境预示和试验提供了理论依据。     

航天器空间环境干扰力矩分析与仿真研究

针对航天器在轨运行时所受到的空间环境干扰力矩进行建模分析,并通过实时解算和矢量叠加的方式进行仿真研究,尤其对太阳光压力矩与大气阻力力矩的建模与仿真提出了新的方法,该方法通过建立光照面与迎风面的判断准则,准确地对太阳光压力矩与大气阻力力矩进行了估计。对各种空间环境干扰力矩的精确建模与仿真为航天器精确姿态控制设计及系统姿态控制方案和控制执行机构的选取提供了依据,文中提出的方法简单易用,工程实现性强,为未来的工程应用提供了一定的理论依据。     

Sulfur “concrete” for lunar applications – Sublimation concerns

Melting sulfur and mixing it with an aggregate to form “concrete” is commercially well established and constitutes a material that is particularly well-suited for use in corrosive environments. Discovery of the mineral troilite (FeS) on the moon poses the question of extracting the sulfur for use as a lunar construction material. This would be an attractive alternative to conventional concrete as it does not require water. However, the viability of sulfur concrete in a lunar environment, which is characterized by lack of an atmosphere and extreme temperatures, is not well understood. Here it is assumed that the lunar ore can be mined, refined, and the raw sulfur melded with appropriate lunar regolith to form, for example, bricks. This study evaluates pure sulfur and two sets of small sulfur concrete samples that have been prepared using JSC-1 lunar stimulant and SiO₂ powder as aggregate additions. Each set was subjected to extended periods in a vacuum environment to evaluate sublimation issues. Results from these experiments are presented and discussed within the context of the lunar environment.     

Minimizing energy utilization for growing strawberries during long-duration space habitation

Strawberry is a candidate crop for space that is rich in protective antioxidants and could also have psychological benefits as a component of crew diets during long-duration space habitation. Energy for electric lighting is a major input to a controlled-environment crop-production system for space habitation. Day-neutral strawberry cultivars were evaluated at several different photoperiods to determine minimum lighting requirements without limiting yield or negatively impacting fruit quality. The cultivars ‘Tribute’, ‘Seascape’, and ‘Fern’ were grown at 14, 17, or 20 h of light per day, and fruit yield was evaluated over a 31-week production period. This amounted to a difference of 2418 kWh m⁻² in energy usage between the longest and shortest photoperiods. All cultivars produced similar total fresh weight of fruit regardless of photoperiod. Volunteer tasters rated organoleptic characteristics including sweetness, tartness, texture, and overall appeal as measures of fruit quality. Generally, organoleptic attributes were not affected by photoperiod, but these attributes were somewhat dependent upon cultivar and harvest time. Cultivars under different photoperiods varied in their production of fruit over time. ‘Seascape’ was the most consistent producer, typically with the largest, most palatable fruit. ‘Seascape’ plants subsequently were grown at 10-, 12-, or 14-h photoperiods over a treatment period of 33 weeks. Photoperiod again had no significant effect on total fruit weight, although there were periodic flushes of productivity. Fruit under all photoperiods had acceptable approval ratings. A large-fruited, day-neutral strawberry cultivar such as ‘Seascape’ remains productive under shortened photoperiods, allowing reductions in energy and crew labor while maintaining flexibility for mixed-cropping scenarios in space.     

支持内容分析的网络监视器的设计与实现

当网络发生异常时，对网络上传输的数据进行监视和分析，是网管人员解决网络故障的一种常用方法。本文介绍一种支持多种平台及内容分析的网络监视器系统的设计与实现，并简要介绍其中所涉及的数据包截获、数据包分析以及应用数据重组等关键技术。该系统可以监听网管人员感兴趣的数据包，通过对其进行分析和研究，分析出其遵守的协议以及其应用层数据，同时支持将应用层数据进行重组，恢复到被监视用户所看到数据的格式，达到与被监视用户相同的显示效果。该系统的实现，为网管人员有效地管理网络提供了一种直观的工具。     

网络环境下的知识产权保护

网络的发展推进了人类信息化进程。但网络也给知识产权的保护带来了难题。文章通过对网络环境下知识产权保护的诸多问题的讨论及其所使用法律法规的分析 ,从而提出了对其进行保护的措施。     

全球导航完好性通道（GNIC）方案讨论

国际民航组织(ICAO)将采纳 GPS GLONASS INMARSAT 联合组成的 GNSS 系统供全球导航使用。对系统的增强和完好性监控是至关重要的问题。本文介绍近年来提出的各种地面完好性监控通道(GIC)的方案,包括地面监测台网、地面数据传输的通信链路和卫星转发。重点阐述 INMARSAT 提出的静止卫星加发导航信号的重叠(IGO)概念和全球性完好性监测台网(IMN)。然后进行比较和讨论,并提出需进一步跟踪研究。     

基于DSP和单片机的刀具监控系统设计

根据刀具监控系统数据采集量大，计算量繁重以及对实时性要求高的特点，采用单片机和DSP并行处理的双CPU处理方案对系统进行设计，即该系统由并行运行的两个子系统构成：基于单片机80C196KC的信号采集及控制功能子系统负责反映刀具状态的各路信号的采集和各种控制功能；基于DSP TMS320C32为核心的信号处理子系统负责信号处理和刀具状态值的估计。此方案充分利用了DSP运算能力强和单片机控制能力强的优点，实现了系统的快速运算和实时控制功能。