卫星扩频应答机抗单粒子翻转技术研究

对卫星扩频应答机抗单粒子效应的方法进行分析,设计了采用反熔断丝工艺的FPGA （A54SX32）,通过回读比对功能对FPGA 进行监控和处理。此方法大大降低了单粒子效应造成卫星扩频应答机发生功能性故障的可能性,并在系统中通过内部高可靠单机对易发生单粒子效应的扩频应答机进行监控,诊断出故障后进行修复,同时设计定时复位对应答机进行复位、开机操作,确保卫星在轨扩频应答机的正常稳定工作。     

面向层流减阻设计的转捩预测方法研究

发展高效可靠的转捩预测方法是飞行器层流减阻设计的关键。本文针对未来飞行器对层流减阻设计的强烈需求,发展了三种工程实用的转捩预测方法,分别为基于线性稳定性理论的双eN方法、基于流场当地变量的γ-Reθ转捩模型和一种基于动模态分解的DMD/eN转捩预测新方法。通过DLR-F4翼身组合体、镰刀形机翼及NLF0416自然层流翼型转捩预测算例的计算值与实验值对比,验证了所发展的转捩预测方法的正确性。以双eN方法为例,将转捩预测方法与优化方法结合,开展了针对中短程民机的跨声速层流机翼优化设计研究。结果表明,优化机翼相对于基准机翼减阻效果明显,证明了本文发展的转捩预测方法有较强的工程应用价值。     

氢处理对钛合金组织性能的影响及其机理

总结了钛合金的氢处理工艺方法，综述了氢在钛合金中的基本效应，以及氢对钛合金的组织结构和力学性能的影响规律及其机理。     

一种基于USB2．0接口的数据采集系统的设计方案与实现

提出了一种基于USB2．0(Universal Serial Bus)接口数据采集系统的设计及具体实现方法；该系统使用CYPRESS公司的EZ_USB系列芯片；整个系统的开发主要围绕EZ_USB—CY7C68013芯片；该系统可进一步扩展成对多媒体采集系统。     

Tírez lake as a terrestrial analog of Europa

Tírez Lake (La Mancha, central Spain) is proposed as a terrestrial analogue of Europa's ocean. The proposal is based on the comparison of the hydrogeochemistry of Tírez Lake with the geochemical features of the alteration mineralogy of meteoritic precursors and with Galileo's Near Infrared Mapping Spectrometer data on Europa's surface. To validate the astrobiological potential of Tírez Lake as an analog of Europa, different hydrogeochemical, mineral, and microbial analyses were performed. Experimental and theoretical modeling helped to understand the crystallization pathways that may occur in Europa's crust. Calculations about the oxidation state of the hypothetical Europan ocean were estimated to support the sulfate-rich neutral liquid model as the origin of Europa's observed hydrated minerals and to facilitate their comparison with Tírez's hydrogeochemistry. Hydrogeochemical and mineralogical analyses showed that Tírez waters corresponded to Mg-Na-SO(4)-Cl brines with epsomite, hexahydrite, and halite as end members. A preliminary microbial ecology characterization identified two different microbial domains: a photosynthetically sustained community represented by planktonic/benthonic forms and microbial mat communities, and a subsurficial anaerobic realm in which chemolithotrophy predominates. Fluorescence in situ hybridization has been used to characterize the prokaryotic diversity of the system. The subsurficial community seemed to be dominated by sulfate-reducing bacteria and methanogens. Frozen Tírez brines were analyzed by Fourier-transform infrared techniques providing spectra similar to those reported previously using pure components and to the Galileo spectral data. Calorimetric measurements of Tírez brines showed pathways and phase metastability for magnesium sulfate and sodium chloride crystallization that may aid in understanding the processes involved in the formation of Europa's icy crust. The use of fluorescence hybridization techniques for microbial detection and characterization in hypersaline environments makes this methodology strongly advisable for future Europa astrobiological missions.     

一种新的微型表面微机械隧道式加速度计

作者已征税出一种新的微型表面微机械隧道式加速度计。加速度计的结构是在单晶硅片上产生出来的，由含有静电偏转电极的单个悬臂梁及其下面的隧道式顶部组成。在空气中，１００μｍ和２５０μｍ长的悬臂梁的噪声分辨率在５００Ｈｚ条件下分别为８．３×１０＾－４ｇ／Ｈｚ＾１／２和８．５×１０＾－５ｇ／Ｈｚ＾１／２。该器件使用一种低噪声自动伺服控制电路，以力再平衡伺服状态工作，所提供的动态量程为１０＾４ｇ。这种新的加速     

高加速度,高性能固态加速度计的研制

本文介绍了由美陆军导弹司令部主管的，用在先进功能导弹（ＡｄＫＥＭ）开发项目上的高性能，高ｇ值的战术加速度计的研制进展情况，加速度计的设计目标就是在整个２０ｇ的软发射阶段、１２００ｇ的助推阶段及低ｇ值的巡航阶段提供捷联战术导航级的加速度信息。加速度计所提供的加速度测量精度必须满足５００ｍ距离内导航精度为０．５ｍ（ＣＥＰ），即加速度计具有以１ｍｉｌｌｉ－ｇ分辨率测量１２００ｇ加速度的能力。先进功能导弹