智能抽油井示功仪

本文介绍了一种基于微控制器的抽油井示功仪的硬件结构、软件设计及其工作原理，并介绍了一种快速测试方法，即单周期测试法。     

基于飞行器的飞行导航与飞行控制数据综合的研究

针对基于双处理器结构的飞控计算机数据综合过程中的时间同步、时间管理问题,采用了初始同步和周期同步相结合的方式,对任务运行中的误差进行了修正,并在时间同步的基础上,将控制链条分解成若干个控制单元进行分时调度,实现了双机并行处理.同时对数据综合过程中的数据处理方式也进行了讨论.     

中介粗集及其在数据挖掘中的应用

粗集理论已成功应用于数据挖掘，如基于粗集方法的属性发现和决策规则的约简等。中介集合论是以中介逻辑为基础，也可以用于数据挖掘。文中将两者相结合，提出了中介粗集的概念。中介粗集是普通粗集的推广，为不完全信息系统的数据挖掘提供了新的工具，不仅可用于一般的信息系统，还适用于数据取空值的信息系统（允许结论取空值）。利用中介粗集进行数据挖掘不但可以得出粗集理论中的约简，还能得到更为简洁的中介约简。文中还给出了     

云计算综述

论述了云计算的起源、概念、特点,与分布式计算和网格计算的区别;介绍了云计算厂商,及各厂商采用的数据存储、数据管理、编程模式、提供的服务种类云计算存在的问题,特别是云计算安全的风险种类及防护方法。提出了云计算需解决的问题。     

Reducing variability in short term orbital lifetime prediction

Within the last year three major re-entries occurred. The satellites UARS, ROSAT and Phobos-Grunt entered Earth’s atmosphere with fragments reaching the surface. Due to a number of uncertainties in propagating an object’s trajectory the exact place and time of a satellite’s re-entry is hard to determine. Major influences when predicting the re-entry time are the changing precision of the available orbital data, the satellite’s ballistic coefficient, the activity of the sun which influences the Earth’s atmosphere and the underlying quality of the atmospheric model. In this paper a method is presented which can reduce the variability in short-term orbital lifetime prediction induced by fluctuating orbital data accuracies. A re-entry campaign is used as a reference for this purpose. For a window of a few weeks before the re-entry the position data of a synthetic object is disturbed considering different degrees of orbital data errors. As a result different predictions will exist for the generated position data of a given day. Using a regression algorithm on the available data an average position is obtained, which is then used for the orbital lifetime prediction. The effect of this measure is a more consistent prediction of the orbital lifetime. The paper concludes with the comparison of the generated re-entry windows in various test cases for the original and the averaged data.     

用输入数据符号加权减小MSK信号的带外功率

由于最小频移键控信号具有较为理想的功率谱特性，近年来已得到广泛关注，但在某些场拾它的带外能量泄漏不能满足实际需要。在此情况下可以对输入数据符号进行加权处理，从而得到一类ＭＳＫ信号这类ＭＳＫ信号仍为等幅波，相位仍保持连续。本文给出了这类信号功率谱的计算公式以及加权函数和功率谱的关系，并给出实例。     

基于LabVIEW的飞机电源地面试验测试系统

为了检验飞机电源的供电品质是否达到国家标准,设计了一套基于虚拟仪器技术的通用飞机电源地面测试系统.本文介绍了系统的硬件组成和软件的实现.     

Working Group 4 Report: Composition and Elemental Abundance Variations in the Solar Atmosphere and Solar Wind

This paper contains a summary of the topics treated in the working group on abundance variations in the solar atmosphere and in the solar wind. The FIP bias (overabundance of particles with low First Ionization Potentials over photospheric abundances) in coronal holes and coronal hole associated solar wind amounts to values between 1 and 2. The FIP bias in the slow solar wind is typically a factor 4, consistent with optical observations in streamers. In order to distinguish between different theoretical models which make an attempt to explain the FIP bias, some observable parameters must be provided. Unfortunately, many models are deficient in this respect. In addition to FIP fractionation, gravitational settling of heavy elements has been found in the core of long lived streamers. The so-called electron 'freeze in' temperatures derived from in situ observed ionization states of minor ions in the fast wind are significantly higher than the electron temperatures derived from diagnostic line ratios observed in polar coronal holes. The distinction between conditions in plumes and interplume lanes needs to be further investigated. The 'freeze in' temperatures for the slow solar wind are consistent with the electron temperatures derived for streamers. This revised version was published online in June 2006 with corrections to the Cover Date.     

飞行模拟器动力学仿真系统算法分析

针对六自由度飞行模拟器仿真算法复杂性与实时性要求高的特点，首先将算法离散化为简单的加乘、三角函数运算，然后采用SDK编写C 程序实现控制算法。该方法程序设计紧凑、执行迅速，通过Setrrimer()函数以采样时间(1／30s)为周期定时发出WM_TIMER消息，在该消息处理函数中具体实现手柄输入数据的读取、控制算法的计算、计算结果网络传输，从输入数据读取到输出数据传输所用时间小于采样时间(1／30s)，满足了飞行模拟器在线实时控制的要求。     

基于Delphi下Winsock的应用程序开发与研究

介绍了W insock的发展历程,分析了利用W insock开发应用程序的过程和步骤,并研究了在D elph i下如何应用W insock组件实现数据传输,并动态显示接收到的数据。