Windws95与UNIX系统互联及实时通信

探讨了Ｗｉｎｄｏｗｓ９５的网络性能，并介绍了一个Ｗｉｎｄｏｗｓ９５与ＵＮＩＸ系统互联和实时通信实例。     

Power Builder4.0菜单技术

ＰｏｗｅｒＢｕｉｌｄｅｒ４．０是一个基于Ｗｉｎｄｏｗｓ的前端应用开发平台；用它开发出来的应用就是一个普通的Ｗｉｎｄｏｗｓ应用．在开发切合实际的应用程序中，会碰到不同于普通程序的特殊问题．文中对对象、事件的行为、脚本实质以及对象之间的方式作了分析，并且给出了如何实现菜单系统的方法。     

微软新一代分布式计算机数据处理系统结构在民航的具体作用——基于组件对象

Ｗｉｎｄｏｗｓ ＤＮＡ（分布式集成网络应用体系结构），是第一个将Ｉｎｔｅｒｎｅｔ、客户／服务器以及用于计算的ＰＣ模型结合并集成在一起的为新一类分布式计算方案而设计的应用软件体系结构，Ｗｉｎｄｏｗｓ ＤＮＡ的核心是将Ｗｅｂ和客户机／服务器的应用开发模型通过一套公共对象集成起来。利用Ｗｉｎｄｏｗｓ ＤＮＡ提供的优势，我们构建了西南航空重公司人劳管理系统，该系统通过ＣＯＭ（Ｃｏｍｐｏｎｅｎｔ Ｏｂｊｅｃ     

可用于空管员的超宽显示器

Ｐａｎｏｒａｍ技术公司推出ＰｏｗｅｒＶｉｅｗ２９０超宽显示器，由三个１０９厘米Ｘ３１厘米、３８４０ｘ１０２４像素的平板显示器组成，屏幕之间的边条宽度仅１．５厘米。它能像一个显示器那样工作，并与Ｕｎｉｘ、ＭａｏＯＳ及ＷｉｎｄｏｗｓＮＴ操作系统兼容。可用于空管员的超宽显示器     

一种基于Windows NT的实时测控操作系统

本文根据航天实时测控的需求，对Ｗｉｎｄｏｗｓ ＮＴ进行系统扩展，设计开发了一种基于Ｗｉｎｄｏｗｓ ＮＴ的实时测控操作系统。     

X—Window系统环境下汉字的使用方法

本文介绍了在Ｘ－Ｗｏｎｄｏｗ系统环境下，实现使用汉字的一种基本方法；对建造Ｘ－Ｗｉｎｄｏｗ环境中的字符库进行了详细的探讨；并对使用汉字提出了几点建议。     

对DOS和Windows的功能改进及计算机病毒防治的模糊分析法研究

首先对ＤＯＳ操作系统中ＣＤ命令的不足进行了改进；针对一些在Ｗｉｎｄｏｗｓ中不能安全运行甚至根本无法运行的ＤＯＳ程序，笔者设计了一个小工具，作为“安全套”加载在这些与Ｗｉｎｄｏｗｓ不相容的程序上，使其安全性有了保障；然后介绍了ＤＯＳ常用命令在计算机病毒防治方面的应用技巧，并针对文件型病毒提出了一种完全脱离汇编知识的、方便实用的“模糊分析法”。各部分均附有相关程序或实例．     

电网中利用ODBC实现对历史数据库的访问

详细介绍了ＯＤＢＣ的使用，并结合电力系统中的一个实例，说明在Ｗｉｎｄｏｗｓ９５环境下，ＶＣ＋＋５０利用ＯＤＢＣ实现对历史数据库的访问     

Windows环境下的坐标测量机软件系统

Ｗｉｎｄｏｗｓ环境下的坐标测量机软件系统ＤＥＡ公司已采用通用的Ｗｉｎｄｏｗｓ程序增强其Ｔｕｔｏｒ数据处理及控制系统测量软件。新一代的Ｗｉｎ加ｒ驱动的Ｔｄｅｒ控制及数据处理系统采用基于特征的测量方法，并为用户提供一个非常容易学习的图形接口，该接口在其表...     

下一代的CMM硬件和软件

下一代的ＣＭＭ硬件和软件英国ＬＫ公司目前正在采用一种易于使用的Ｗｉｎｄｏｗｓ环境下的测量软件包，并推出了其经重新设计过的Ｃ—９０Ｃ系列三坐标测量机．Ｗｉｎｄｏｗｓ环境下的ＣＭＥＳ２０００测量软件包可在任何４８６或奔腾计算机平台上运行，并且可根据ＣＡＤ...     

天体对地球同步静止轨道卫星的影响研究

天体对地球同步静止卫星的正常运行有极大的影响.探讨了卫星与地球、太阳及月球之间的相互关系,研究了它们对确定卫星轨道、姿态的影响,分析了它们对姿态造成干扰、导致太阳能供给中断的地影、月影及影响卫星通信的日凌中断现象,给出了精确预报这些现象的算法,这些方法已经成功地应用到我国在轨地球同步静止卫星的工程测控中.     

基于故障树分析法的压气机振动故障分析

为了研究某型压气机在部件试验过程中发生的振动异常故障,基于Isograph的故障树分析法,对33项底事件主要从流体激振、机械激振和测试系统复查等3方面进行定性分析。结合试验中的气动数据和监测数据,利用排除法(设计排查和实物排查)逐级确定各底事件的不可用度大小,选取其中不可用度最高的底事件再进行详细分析,确定了故障原因:有3片压气机第1级转子叶片的叶尖与对应的机匣发生偏摩,其转子不平衡量发生了较大变化。通过采取对磨损的叶尖部位进行抛修,重新对压气机转子进行动平衡的方法排除了该故障,使试验顺利开展。     

基于语音的奥运信息智能查询系统

提出了一个基于语音交互的奥运信息查询系统。该系统综合应用语音识别、智能人机交互等先进技术,实现了通过语音对历届奥运会的相关信息的查询。在语音识别和问句理解方面,将统计方法与规则方法相结合,利用领域相关知识和受限语言文法,显著地提高了语音识别和问句理解的正确率。实验结果表明,提出和采用的各种技术方法是有效的。     

基于均值的副翼作动筒载荷事件划分方法

副翼是民用飞机重要操纵面之一,主要功用是产生飞机滚转力矩,用于改变飞机的航向。现代中大型飞机的操纵系统大都采用伺服作动器-操纵面装置,当操纵面受到铰链力矩时作动器也相应受载。以民用飞机副翼作动筒为研究对象,基于试飞实测数据与主操纵面作动筒载荷计算模型,提出了一种基于均值的作动筒载荷事件划分方法。结果表明,该事件划分方法效果理想,较好地反映出了不同飞行事件之间载荷均值的差异。通过对14 000次飞行作动筒载荷历程进行雨流处理,给出了相应的载荷谱及载荷幅值、均值分布直方图,总结出相关分布规律。该疲劳载荷谱及相应的分布规律对工程实践中的寿命计算具有重要意义。     

Basic Physical Mechanism of Fast Reconnection Evolution in Space Plasmas

Large dissipative events, such as solar flares and geomagnetic substorms, may result from sudden onset of fast (explosive) magnetic reconnection. Hence, it is a long-standing problem to find the physical mechanism that makes magnetic reconnection explosive; in particular, how can the fast magnetic reconnection explosively evolve in space plasmas? In this respect, we have proposed the spontaneous fast reconnection model as a nonlinear instability that grows by the positive feedback between plasma microphysics (anomalous resistivity) and macrophysics (global reconnection flow). On the basis of MHD simulations, we demonstrate for a variety of physical situations that the fast reconnection mechanism involving slow shocks in fact evolves explosively as a nonlinear instability and is sustained quasi-steadily on the nonlinear saturation phase. Also, distinct plasma processes, such as large-scale plasmoid propagation, magnetic loop development and loop-top heating, and asymmetric fast reconnection evolution, directly result from the spontaneous fast reconnection model. Obviously, MHD simulations are very useful in understanding the basic physics of explosive fast reconnection evolution in space plasmas. However, they cannot treat the details of microphysics near an X neutral point, which should be precisely studied in the coming 21st century.     

High-energy solar-particle events

Conclusion Recent high-energy solar-particle events have been illustrated and described individually. The manner in which the observations have been used to develop and test concepts of the hydromagnetic behaviour of the solar plasma in space has been outlined. Some of the events have been analyzed in more detail than hitherto. The results seem to support the concept that the magnetic field of a sunspot tends to erupt, or to balloon, into space in the form of a great tongue or sack attached to the sun near the sunspot. Supersonic shock processes also must be involved in the propagation of disturbances in planetary space, and the fluxes of galactic and of solar particles may change in the vicinity of such shocks, but alone shocks do not appear to be capable of explaining all the observed effects.     

Optimum Adaptive Reception for Binary Sequences

The a posteriori probability density function p(?|X1, X2,...,Xk), where the Xi, i=1, 2, ..., K, represent Kvector-valued observations statistically related to the random vector ?, appears in many applications of the methods of statistical inference to problems in pattern recognition and statistical communication theory. In this paper, it is shown that for equally likely binary sequences (M= 2) of anticorrelated patterns for signals observed in additive Gaussian noise, a device that computes p?|X1, X2, XK) can be synthesized from a correlator, a simple instantaneous nonlinearity, and a multiplier. These results are used to derive some equally simple structures for various optimum nonsupervised estimators, pattern recognition machines, and signal detectors.     

度量空间X与H(X)空间的连续映射

度量空间是用距离来定义拓扑结构的特殊拓扑空间，度量空间的完备性是度量空间的一个独有的性质．在完备度量空间上建立分形空间H(X)，如果函数在完备度量空间上连续，则函数在分形空间H(X)空间上连续。由局部基的覆盖来刻划紧空间，用H(X)表示X中的全体非空紧集构成的集族．在此集族中定义豪斯道夫距离，连续映射的定理在分形空间成立。     

Space Weather and the Ground-Level Solar Proton Events of the 23rd Solar Cycle

Solar proton events can adversely affect space and ground-based systems. Ground-level events are a subset of solar proton events that have a harder spectrum than average solar proton events and are detectable on Earth’s surface by cosmic radiation ionization chambers, muon detectors, and neutron monitors. This paper summarizes the space weather effects associated with ground-level solar proton events during the 23rd solar cycle. These effects include communication and navigation systems, spacecraft electronics and operations, space power systems, manned space missions, and commercial aircraft operations. The major effect of ground-level events that affect manned spacecraft operations is increased radiation exposure. The primary effect on commercial aircraft operations is the loss of high frequency communication and, at extreme polar latitudes, an increase in the radiation exposure above that experienced from the background galactic cosmic radiation. Calculations of the maximum potential aircraft polar route exposure for each ground-level event of the 23rd solar cycle are presented. The space weather effects in October and November 2003 are highlighted together with on-going efforts to utilize cosmic ray neutron monitors to predict high energy solar proton events, thus providing an alert so that system operators can possibly make adjustments to vulnerable spacecraft operations and polar aircraft routes.     

Energy Spectra, Composition, and Other Properties of Ground-Level Events During Solar Cycle 23

We report spacecraft measurements of the energy spectra of solar protons and other solar energetic particle properties during the 16 Ground Level Events (GLEs) of Solar Cycle 23. The measurements were made by eight instruments on the ACE, GOES, SAMPEX, and STEREO spacecraft and extend from ～0.1 to ～500–700?MeV. All of the proton spectra exhibit spectral breaks at energies ranging from ～2 to ～46?MeV and all are well fit by a double power-law shape. A comparison of GLE events with a larger sample of other solar energetic particle (SEP) events shows that the typical spectral indices are harder in GLE events, with a mean slope of ?3.18 at >40?MeV/nuc. In the energy range 45 to 80?MeV/nucleon about ～50?% of GLE events have properties in common with impulsive ³He-rich SEP events, including enrichments in Ne/O, Fe/O, ²²Ne/²⁰Ne, and elevated mean charge states of Fe. These ³He-rich events contribute to the seed population accelerated by CME-driven shocks. An analysis is presented of whether highly-ionized Fe ions observed in five events could be due to electron stripping during shock acceleration in the low corona. Making use of stripping calculations by others and a coronal density model, we can account for events with mean Fe charge states of 〈Q _Fe〉≈+20 if the acceleration starts at ～1.24–1.6 solar radii, consistent with recent comparisons of CME trajectories and type-II radio bursts. In addition, we suggest that gradual stripping of remnant ions from earlier large SEP events may also contribute a highly-ionized suprathermal seed population. We also discuss how observed SEP spectral slopes relate to the energetics of particle acceleration in GLE and other large SEP events.