基于BU-61580的MIL-STD-1553B远程终端设计

介绍了MIL-STD-1553B总线和BU-61580芯片的特点,给出了基于BU-61580的MIL-STD-1553B远程终端设计思路和方法。最后结合工程实际给出了利用单片机MS1210Y5对BU-61580的初始化、接收、发送过程。     

高校图书流通的5M1E管理法

借鉴质量管理中的"人机料法环测"(5M1E)因果分析管理方法,提出了高校图书流通管理的5M1E分析管理方法.在分析高校图书流通过程中诸要素的作用及其相互关系的基础上,阐述了"以读者为核心,以网络为平台,以图书为对象,依规程做约束.依测量做评价,依环境做创新"的高校图书流通管理指导思想及分析管理方法.     

Pro/E二次开发技术在导弹设计中的应用

为了提高导弹快速设计的效率以及降低设计人员的工作量,以VC++6.0为开发环境,充分利用Pro/E基于骨架模型的参数化建模、变量化和单一数据库等技术,研究基于Pro/TOOLKIT异步模式的Pro/E二次开发技术,实现了应用软件与Pro/E之间的数据通信以及数据共享,从而保证了飞行器的外形及其相关参数能够快速、自动地更新,进而驱动各个学科自动分析.最后通过工程实例,验证了该方法的有效性和系统的可行性,结果表明此方法是可行的.     

Unlicensed Spectrum Sharing Game Between LEO Satellites and Terrestrial Cognitive Radio Networks

By cognitive radio,the low Earth orbit(LEO) satellites may prefer to operate in the unlicensed spectrum which is open to all the users,and compete for the limited resources with terrestrial cognitive radio networks(CRNs).The competition can be regarded as a game and analyzed with game theory.This particular unlicensed spectrum sharing problem is modeled here,and the special properties of "spatially-distinguished-interference" and the short period of the interactions between satellites and terrestrial CRNs are explored.Then,the problem is formulated as a "partially-blind" finitely repeated prisoner’s dilemma by game theory.Finally,we begin with two promising spectrum sharing schemes,which can be used to enforce the frequency reuse among the remotely located terrestrial CRN players as well as to overcome the observation noise.By analysis and comparison,it is proposed that the novel refreshing-contrite-tit-for-tat(R-CTFT) is the optimal spectrum sharing scheme.Simulation results verify that it can be used to utilize the spectrum most efficiently.     

适合多种机床结构的数控系统5坐标变换库

研究了适合多种结构布局形式的统一坐标变换方法,开发出数控系统5坐标变换函数库,并作为坐标变换控制模块集成到数控系统中.分析了5坐标数控机床运动学模型,归纳出12种5坐标数控机床结构布局,并推导了对应的坐标变换数学算法.通过结构分析和数学变换将12种算法扩展归纳到3类基础算法,并基于3类基础算法开发出适合多种机床结构布局的5坐标变换库.利用机床三维仿真系统验证了5坐标变换库的可行性,并将该坐标变换库集成到北京航空航天大学开发的CH-2010开放式数控系统中.     

嫦娥工程技术发展路线

月球是距离地球最近的天体,以其独特的空间位置、广阔的科学探索前景,成为人类地外天体探测和资源利用的首选目标和持续选择。简要总结世界各主要航天大国的探月发展历程和后续计划,详细介绍了我国探月工程(嫦娥工程)"绕""落""回"三步走的发展思路和技术路线,分析了后续的发展方向,提出了2030年前月球机器人科研站任务设想。     

Parameterized Regional Ionospheric Model and a comparison of its results with experimental data and IRI representations

We describe a Parameterized Regional Ionospheric Model (PARIM) to calculate the spatial and temporal variations of the ionospheric electron density/plasma frequency over the Brazilian sector. The ionospheric plasma frequency values as calculated from an enhanced Sheffield University Plasmasphere–Ionosphere Model (SUPIM) were used to construct the model. PARIM is a time-independent 3D regional model (altitude, longitude/local time, latitude) used to reproduce SUPIM plasma frequencies for geomagnetic quiet condition, for any day of the year and for low to moderately high solar activity. The procedure to obtain the modeled representation uses finite Fourier series so that all plasma frequency dependencies can be represented by Fourier coefficients. PARIM presents very good results, except for the F region peak height (hmF2) near the geomagnetic equator during times of occurrence of the F₃ layer. The plasma frequency calculated by IRI from E region to bottomside of the F region present latitudinal discontinuities during morning and evening times for both solar minimum and solar maximum conditions. Both the results of PARIM and the IRI for the E region peak density show excellent agreement with the observational values obtained during the conjugate point equatorial experiment (COPEX) campaign. The IRI representations significantly underestimate the foF2 and hmF2 compared to the observational results over the COPEX sites, mainly during the evening–nighttime period.     

A New Scheme and Microstructural Model for 3D Full 5-directional Braided Composites

Three-dimensional(3D) braided composites are a kind of advanced ones and are used in the aeronautical and astronautical fields more widely. The advantages, usages, shortages and disadvantages of 3D braided composites are analyzed, and the possible approach of improving the properties of the materials is presented, that is, a new type of 3D full 5-directional braided composites is developed. The methods of making this type of preform are proposed. It is pointed out that the four-step braiding which is the most possible to realize industrialized production almost has no effect on the composites'properties. By analyzing the simulation model, the advantages of the material compared with the 3D 4-di- rectional and 5-directional materials are presented. Finally, a microstructural model is analyzed to lay the foundation for the future theoretical analysis of these composites.     

激光焊接ZL114A/5A06 异种铝合金接头组织及性能

采用激光焊接ZL114A/5A06异种铝合金,通过参数优化以获得性能优良的焊接接头,利用光学显微镜(OM)、拉力试验机、高温疲劳试验机、SEM和EDS对接头的显微组织、力学性能和拉伸断口进行了研究。结果表明:焊缝中心区的金相组织为等轴晶;接头焊后不经热处理,抗拉强度可达到265 MPa,为母材强度的80%以上,并有很好的抗疲劳性能;断口分析显示断裂位置在ZL114A母材一侧的熔合线附近;在保证焊透的前提下,激光功率越小,晶粒越细小,接头强度越高。对框架蒙皮结构铝合金贮箱产品试验件进行了焊接,试验件达到了产品各项性能指标要求。     

水杨醛缩－5－碘－8－氨基喹啉新西夫碱试剂的合成及其分析应用研究──分光光度法测定痕量镓

本文介绍了水杨醛缩－５－碘－８－氨基喹啉新西夫碱的合成、提纯与鉴定。特别对其性质及其与镓金属离子显色反应的光度特性作了研究，其配合物３．４９×１０４Ｌ·ｍｏｌ（－１）·ｃｍ（－１）．