导航卫星中断频次的分析方法

面向导航卫星中断频次的定量分析需求,该文分析导航卫星中断产生的主要原因,给出中断频次分析的流程,并针对分析过程中的三个关键问题,研究提出具体实施方法,包括通过相关性分析快速定位底层中断事件,通过中断树建立指标分析模型,并融合在轨数据、地面试验数据快速预估得到底层功能异常率等。最后通过示例进一步说明中断频次分析过程。该文方法已应用于北斗导航卫星工程。     

电铸镍Wolter I型光学系统制造技术发展综述

摘要： 为满足未来脉冲星导航和空间天文观测任务对X射线望远镜的载荷需求，Wolter I光学系统的研制正逐渐成为新的研究热点，电铸镍方案是当前国内外X射线光学系统镜筒制造的主要技术方案.文章对电铸镍X射线光学系统制造工艺、国内外研制现状、未来应用需求进行了介绍和整理，梳理了电铸镍X射线光学系统研制遇到的关键技术和难点，提出了后续研究发展建议，以促进中国在 X射线脉冲星自主导航、空间探测领域的快速发展.     

推进我国企业债券利率市场化的措施

企业债券利率市场化是我国利率市场化改革的重要组成部分。目前,我国已经基本具备了企业债券利率市场化的条件,宏观经济环境稳定,微观经济主体日趋理性,国债和金融债券发行利率市场化也为下一步实现企业债券发行利率市场化提供了宝贵的经验。鉴于此,可以根据企业债券融资发展的不同阶段,采取相应措施加快我国企业债券利率市场化的步伐,主要包括:取消发债企业的所有制限制、培育企业债券流通市场、逐步取消发债规模限制、放宽发行利率的浮动幅度、健全企业债券风险监管制度、规范企业债券信用评级。     

虚拟现实系统中立体显示算法的研究

实时生成三维立体图形是虚拟现实(VR)的一项核心技术.文中对基于投影变换的立体显示算法、基于相关性理论的立体显示算法以及基于计算机生成全息的立体显示算法等进行了研究.     

Riemann积分及其性质的非标准刻画

在非标准扩大模型下，利用内序列族定义了Riemann积分，并在此基础上讨论了可积的条件及积分的一些性质。     

rom 15 sel

with primary goat embryonic fibroblast showed no difference from traditional feederlayer-based culture method used in mouse and human. The putative primary EG colonies were multilayer clumps ofcompact cel     

关于公关文秘专业实习实训教学的探讨——以桂林航天工业高等专科学校为例

桂林航专公关文秘专业在实习实训教学方面做得是比较成功的,论文从构建学生整体实践能力培养目标体系、"双师"型教师队伍建设、校内实习实训基地建设、校企合作四个方面进行研究分析。     

计算机帧时间对半实物仿真的影响

半实物仿真试验中,要求计算机帧时间与计算积分步长相一致,但在实际试验中不容易精确地做到。本文分析了这种不一致给半实物仿真试验带来的影响,给出了解决的办法,文章中还给出了一实例来说明。     

Field formation around negatively biased solar arrays in the LEO-plasma

Heavy emission caused by impacting plasma ions results in a fast discharging effect of the initially large surface potentials on the dielectric solar cells. This eventually counteracts the energization process of the plasma ions to the cover glasses and leaves no significant electric fields. Thus, with an existing thermal plasma, electrons are again able to reach dielectric surfaces. Strong localized electric fields of the order of several 10 kV/cm form near the interconnector-cover glass interface.     

EUV emission from normal galaxies

Using data from the Wide Field Camera EUV all-sky survey, we have established upper limits to the EUV flux from a sample of 30 bright, nearby, non-active spiral galaxies. These galaxies were chosen to be those most likely to be detected in the EUV on the basis of (i) low interstellar absorption within our own galaxy, (ii) brightness in other wavebands, (iii) high star formation activity, and (iv) proximity. The derived EUV upper limits are restrictive, and establish for the first time that the EUV flux escaping from galaxies does not constitute a major component of their bolometric luminosity, and in particular that it cannot be the sink for the energy injected into the interstellar medium by supernova explosions, as had been suggested following the failure to detect this power in the X-ray band.