浅谈档案室的管理

如何加强档案规范化管理,充分发挥档案在实际工作中的作用,本文从档案的收集、整理、保管、利用和人员的素质五个方面来进行阐述。从而提高人们对档案室管理工作的认识,以确保档案室管理工作的进一步提高。     

SCADA系统在石油储运中的应用

应用组态软件及PLC技术实现石油储运数据库的SCADA系统的构建,详细阐述了模拟石油储运中数据采集的硬件需求设计、软件构成,说明了石油储运数据库的SCADA系统的特点、功能、控制原理,完成了石油储运数据库的建立,为石油储运的研究提供了大量的实验数据,为石油储运新方法、新技术的推广提供依据。     

等离子体对空间飞行器表面充电效应探测研究

为确保空间飞行器在轨安全，有必要搭载探测器对轨道空间环境进行实时监测，获取表面充电效应数据。在对轨道空间充电环境分析的基础上，确定探测器的任务目标并完成基于电位探头和电流探头的探测器方案设计，包括探头设计和电路设计。探测器设计方案在空间环境特殊效应测量领域迈出的关键一步，为更多空间效应参数的测量奠定了坚实基础。     

Evaluation of substorm models with Cluster observations of plasma flow reversal in the magnetotail

We evaluate two prevailing substorm models with an event of plasma flow reversal from tailward to Earthward detected by Cluster at the downstream distance of ∼19 R_E in the magnetotail during a substorm on August 22, 2001. We use the unique capability of Cluster measurements in determining gradients to examine the associated current density, Lorentz force, and current dissipation/dynamo term. In association with plasma flow reversal, it is found that (1) there was no clear quadrupole magnetic perturbation signature, (2) the x-component of the Lorentz force did not change sign, (3) the y-component of the product of the current density and the electric field was occasionally negative indicative of a dynamo effect, and (4) the timing sequence of flow reversal from the Cluster configuration did not match tailward motion of a single plasma flow source. These observations are consistent with the near-Earth initiation model for substorms with multiple current disruption sites moving progressively tailward near the late stage of substorm expansion.     

A sample collector for robotic sample return missions II: Radiation tests

Sample return from small solar system objects is playing an increasingly important part in solar system exploration. Critical to such missions is a robust, simple, and economic sample collector. We have developed a collector such as this for near-Earth asteroid sample return missions that we have termed the Touch-and-Go Impregnable Pad (TGIP). The collector utilizes a silicone substrate that is pushed into the dust and gravel surface layer of the asteroid. As part of a systematic evaluation of the TGIP, we have investigated the resilience of this substrate to ionizing radiations. Several miniature versions of the collector, containing typically ∼3 g of the collection substrate, were exposed to 0.564 MeV beta particles from a ⁹⁰Sr source and a 6 MeV electron beam in a linear accelerator to simulate the wide range of energies of solar and galactic ionizing radiation. Various radiation levels up to eight times greater than expected on a six-year asteroid mission (in the case of beta radiation) and 50 times greater than expected (in the case of the 6 MeV electron radiation) were administered to the substrate. After irradiation, the efficiency of the substrate in collecting samples of mock regolith was compared with that of collectors that had not been irradiated. No difference beyond experimental uncertainty was observed and we suggest that the operational TGIP will not be affected adversely by radiation doses expected during a typical six-year inner solar system mission.     

基于VC++和CVI的光纤陀螺测斜仪自动化标定与测试系统

针对光纤陀螺测斜仪的标定和导航精度测试,设计了一种自动化标定与测试系统.该系统利用高精度转台作为运动控制设备,数据采集盒以FPGA和DSP作为硬件核心,标定软件采用VC++作为开发平台,转台控制软件采用LabWinows/CVI作为开发平台,两个软件之间通过基于以太网的UDP协议进行通信.通过测试表明,该系统有效降低了人为因素引入的标定参数误差,提高了导航精度,并缩短了标定与精度验证的时间.     

我国在职管制员的英语现状及其解决对策

新的ICAO通话标准提高了对飞行和管制人员英语听说能力的要求,这对我国民航英语培训和测试都将产生重大影响。本文结合我国实际情况,分析了目前我国在职管制员的英语现状及其存在的问题,并提出了相应的解决对策。     

一种晨昏轨道卫星地球反照系数估计方法

针对地球反照对太阳同步轨道卫星太阳电池阵输出电流的影响,首先比较不同降交点地方时卫星的太阳电池阵输出电流,分析其变化规律,然后选定晨昏轨道卫星作为研究对象,建立太阳电池阵输出电流模型与地球反照系数估计模型,利用最小二乘法估计电流参数与地球反照系数,最后结合不同季节、不同轨道高度卫星的遥测数据进行在轨验证。结果表明,对于轨道高度在1200km以下的晨昏轨道卫星,地球反照系数在0.05以上;地球反照系数随轨道高度增加呈指数规律衰减,衰减系数约为0.002。     

教学用信号发生器的硬件设计

信号发生器以单片机MSP430F4260IDLR内置的高精度16位∑-△型ADC对输入电压信号采样,通过控制数字频率合成芯片AD9850输出可控频率正弦波信号,并将转换后的电阻值与输出信号频率显示于液晶LCD1602。     

过冷大水滴变形与破碎的影响因素

过冷大水滴（SLD）结冰过程中,影响水滴变形与破碎及其导致的效应的因素众多,多种影响因素耦合作用于水滴变形与破碎的规律还未得到清晰认识。采用数值计算的手段,模拟了SLD运动过程中的变形与破碎现象,分别研究了水滴直径、流场速度及绕流物体尺寸变化对水滴破碎与变形及其效应的影响。通过研究,提出了包含SLD的典型流场区域划分方法,得到了不同因素对水滴破碎区域面积、物面的水滴收集特性、破碎子水滴分布特性的影响规律,发现水滴直径、流场速度、翼型前缘半径与变形和破碎影响撞击特性的程度呈正相关关系。在此基础上,提出了一个综合影响参数X,线性回归分析的结果初步说明,X是表征水滴变形与破碎及其效应的合适参数。相关工作可以为SLD结冰的计算、试验以及防/除冰设计提供参考。