Delphi平台下的1553B总线卡通信应用技术研究

介绍一种基于Delphi平台的PCI-1553B总线卡接口通信应用技术,主要包括Delphi下1553B总线周期消息、非周期消息定义、消息传输故障重试、消息数据的中断采集、消息数据的动态更新以及总线消息的传输监控记录等编程技术。并基于1553B总线卡和Delphi平台设计了一套电控模拟器通信系统,验证了1553B总线的BC->RT通信和RT->BC通信以及BM总线监控功能。实践表明,利用Delphi开发1553B总线通信应用技术以及Delphi对数据库技术的完美支持,与其他开发语言相比,该技术可快速建立完善的1553B总线通信测试系统。     

基于BU-64843的MIL-STD-1553B 总线远程终端的设计

为了研究MIL-STD-1553B总线协议在某航空机载设备中的使用方法,提升1553B总线远程终端的性能,通过分析1553B总线的结构和特点,提出了采用DSP作为处理器,以BU-64843作为协议芯片实现远程终端（RT）的方案,并进行了硬件和软件的详细设计。相比传统以BU-61580为协议芯片的RT,简化了硬件设计,提高了数据处理能力。对设计的RT进行了1553B总线消息的接收、发送测试,结果表明其能够可靠地实现总线数据的传输,在高性能嵌入式设备的研制中具有一定的工程应用前景。     

基于DSP的空间相机1553B总线通信设计与实现

为提高MIL-STD-1553B总线接口的实时性并简化接口逻辑,从星载平台与相机控制器实际通讯功能需求出发,设计出了基于1553B专用接口芯片BU-61580与控制器核心TMS320C30的1553B总线通信系统;由FPGA完成BU-61580和TMS320C30之间的逻辑综合电路,并产生中断与片选信号;该系统实现了接收卫星平台数据注入与程控指令,发送工程参数等功能;系统硬件电路连接简单,数据时效性好,经过反复调试,已成功应用于某型号空间相机中。     

基于DSP和LabVIEW的1553B总线芯片测试系统的设计与实现

B芯片测试系统由上位机和下位机两部分构成,下位机是用两片DSP芯片作为控制芯片构建两个1553B总线的终端,上位机在计算机上用LabVIEW平台控制一块1553B的总线板卡,并且通过串口发送各种测试命令给下位机,共同完成对DDC公司的BU-61580系列芯片的内部功能、总线协议功能及电气特性测试,对被测芯片处于BC、RT、MT三种不同类型终端时的各种功能与时序进行直观显示;测试环境与芯片在实际运用中效果一样,可以对芯片进行筛选,成本低;通过在某单位实际应用表明,该测试系统具有测试简单、功能全面、性能稳定的特点,系统还可自检,满足了用户的要求。     

基于BU-61580总线控制器的接口及容错设计

针对RS-422接口与1553B总线接口无法直接进行高可靠性数据通信,提出了一种基于BU-61580总线控制器的接口及容错设计。设计采用1553B接口芯片BU-61580,通过FPGA控制完成了RS-422与1553B的接口控制及二者之间的数据处理。在硬件接口设计的基础上,设计IP-CORE完成BU-61580的芯片配置,并通过增加容错设计提高了总线控制器数据通的可靠性。经测试结果显示,计算机通过总线控制器与RT终端通信稳定、可靠,并应用于某测试系统中。     

基于VPX总线的潜射导弹综合电气系统集成化设计

提出了潜射导弹测控系统集成化设计需求,对VPX总线与其他总线的性能进行了对比,提出了潜射导弹地面综合电气系统集成化设计方案,提出了基于VPX总线的测控系统设计方案。     

高速1553B总线通讯控制器测试验证系统研究

通过对10M1553B总线通讯控制器的特性进行分析,再结合10M1553B总线通讯控制器的A、B总线通道切换测试及通讯强度测试的测试指标,提出了相应的测试验证系统方案;通过对测试验证结果的研究与分析,证实10M1553B总线通讯控制器具有较好的品质,能够在一定程度上替代国外的同类产品;同时针对10M1553B总线通讯控制器所设计的测试验证系统方案、各测试指标所对应的测试方法和通过准则,对于其它类似产品的系统级综合测试具有普遍性、适用性和指导性;并通过实际测试验证了该测试验证系统的可靠性和稳定性。     

基于1553B总线和以太网的接口卡设计

为实现指令的可靠接收和远距离、大容量数据的高速回收,结合1553B总线的实时性、高可靠性和以太网传输的速度快、距离远等优点,设计了基于1553B总线和以太网的接口方案;介绍了BU-65170作为RT端与BC端通信的硬件设计、初始化配置及消息的接收,阐述了W5300与远端上位机通讯的硬件设计及UDP传输,并针对以太网采用快速UDP传输方式的不可靠性,从硬件设计和逻辑实现进行了可靠性优化,经过试验验证,采用20 m屏蔽双绞线,以7 MB/s速度传输数据,未出现丢数和误码现象,已成功应用在工程实践中。     

基于1553B总线的飞行器电气综合系统管理设计

为了简化飞行器日益发展电气设备而造成的复杂连接关系,并实现电气综合系统的自主管理;通过对两种典型总线比较,采用了一种基于1553B总线、冗余的飞行器电气综合系统模块化设计方法,主要通过总线控制器备份控制方式,在主计算机出现故障的时候,备份计算机能完全接替总线控制权;该方法在满足实时性和可靠性需求同时,可以针对不同的电气系统设计构架,快速进行系统重构,具有很强的可配置性,而且大大减小了系统的体积和重量,适应电气综合系统构架的发展方向。     

用于光电设备的航电总线数据测试系统

由于单项的专用总线测试系统通用性、兼容性较差,功能扩展和技术升级的难度较大,介绍一个可以支持1553B、ARINC429、CAN、RS232和RS422五种航电标准的数据总线测试系统的设计方案及技术实现。重点介绍了数据总线测试系统的硬件框架组成,同时分析了系统软件实现方法以及总线逻辑控制设计。该测试系统已成功用于某光电设备在线检测,经实验验证该系统运行稳定可靠。     

Chalcogenide Fibers: An Overview of Selected Applications

Chalcogenide glass fibers have many unique properties that make them attractive for applications that are not possible with silica fibers. Selected applications of chalcogenide fibers in research, commerce, and the military are reviewed.     

Some mathematical aspects of Anderson localization: boundary effect,multimodality, and bifurcation

Anderson localization is a famous wave phenomenon that describes the absence of diffusion of waves in a disordered medium. Here we generalize the landscape theory of Anderson localization to general elliptic operators and complex boundary conditions using a probabilistic approach, and further investigate some mathematical aspects of Anderson localization that are rarely discussed before. First, we observe that under the Neumann boundary condition, the low energy quantum states are localized on the boundary of the domain with high probability. We provide a detailed explanation of this phenomenon using the concept of extended subregions and obtain an analytical expression of this probability in the one-dimensional case. Second, we find that the quantum states may be localized in multiple different subregions with high probability in the one-dimensional case and we derive an explicit expression of this probability for various boundary conditions. Finally, we examine a bifurcation phenomenon of the localization subregion as the strength of disorder varies. The critical threshold of bifurcation is analytically computed based on a toy model and the dependence of the critical threshold on model parameters is analyzed.     

辣椒碱与β-环糊精包合物的核磁共振研究

利用核磁共振方法研究了辣椒碱β-环糊精包合物的化学计量比、空间结构信息及其在水溶液中的自扩散系数. 通过测定不同浓度比的辣椒碱和β-环糊精混合溶液的 ¹H NMR数据,绘制Job's曲线,辣椒碱和β-环糊精的Job's曲线均在r=0.5处出现拐点. 同时测定了该包合物的2D ROESY和DOSY谱图,ROESY谱图中NOE交叉信号出现在辣椒碱的H-1~H-8和β-环糊精的H-3′、H-5′、H-6′之间,DOSY测得β-环糊精和辣椒碱形成包合物前后的表观自扩散系数. 结果表明,辣椒碱β-环糊精包合物的主客体分子的化学计量比为1∶1,辣椒碱分子的异丙基端从β-环糊精的宽口端进入疏水腔,其中H-1~H-8部分在空腔内部,包合物的自扩散系数为2.95×10^-10m²/s.     

Darboux Transformation and N-soliton Solution for Extended Form of Modified Kadomtsev-Petviashvili Equation with Variable-Coefficient

The extended form of modified Kadomtsev-Petviashvili equation with variable-coefficient is investigated in the framework of Painlevé analysis. The Lax pairs are obtained by analysing two Painlevé branches of this equation. Starting with the Lax pair, the N-times Darboux transformation is constructed and the N-soliton solution formula is given, which contains 2n free parameters and two arbitrary functions. Furthermore, with different combinations of the parameters, several types of soliton solutions are calculated from the first order to the third order. The regularity conditions are discussed in order to avoid the singularity of the solutions. Moreover, we construct the generalized Darboux transformation matrix by considering a special limiting process and find a rational-type solution for this equation.     

The ρ-π Puzzle of J/φ and φ′ Decays

The recent BES Collaboration data on φ →PV, particularly the isospin violating mode φ′ → π^oω^o and finding of a finite number for B(φ′ → K^*OK^O), enable us now to deal more precisely about the challenges to theory concerning this extraordinary and remarkableso-called ρ-π puzzle of J/φ and φ′ decays. In terms of the existing data and deploying the simplest phenomenology, measurement of φ′ → π⁺π^- and whether a finite number for the K^*+K^- mode might require a significantly large accumulation of data remain interesting questions.     

Interaction of Wave Trains with Defects

The evolution and transition of planar wave trains propagating through defects(obstacles) in an excitable medium are studied. When the frequency of the planar wave trains is increased, three different dynamical regimes,namely fusion, "V" waves, and spiral waves, are observed in turn and the underlying mechanism is discussed. The dynamics is concerned with the shapes of the defects. Circle, triangle, and rectangle defects with different sizes are considered. The increase of pacing frequency broadens the fan-shaped broken region in the behind of a rectangle defect.The increase of width of a triangle defect leads to breakup of wave trains easier while the change of height shows opposite effect, which is presented in a phase diagram. Dynamical comparison on defects with different shapes indicates that the decrease of the defect width along the propagation of wave trains makes the fan-shaped region and the minimal frequency for breakup of spiral both increased.     

HL-2M 装置时序控制与数据采集系统设计

基于 FPGA 和 IEEE1588PTPv2 协议设计了 HL-2M 装置时序控制系统,用于在精准时刻为测控系统 提供触发。数据采集系统采用客户端/服务端双模式管理。在 HL-2M 装置初始等离子体放电实验中测试结果表明, 时序控制和采集系统具有纳秒级精度触发,实时性强,数据传输速度快,稳定可靠,方便部署和管理的特点,满 足 HL-2M 等离子体放电实验的应用需求。     

Double Diffractive Dissociation Process p + p(p) → Xp + Xp(p) + Π+ + Π- at High Energy and the Pomeron Model of Donnachie-Landshoff

Large p_γ charged pion pair produced in Double Diffractive Dissocjation (DDD) process at high energy is studied with double pomeron (IP) exchange mechanism. Using DonnachieLandshoff pomeron model we have calculated the cross-section of the process at the energy interval from ISR to LHC when the rapidity of the charged pions is approximately equal to zero. It is shown that this process is the favorite in experiments which could effectively be used to examine Donnachie-Landshoff pomeron model and provide a possibility to check the value of the suppression coefficient N².     

CFETR N-NBI验证样机恒温供水系统的设计

通过分析中国聚变工程实验堆(CFETR)的基于负离子源的中性束注入系统(N-NBI)验证样机中等离子体电极的工况,确定了其恒温供水的技术参数,设计出了CFETR N-NBI验证样机恒温供水系统。     

环位形下鱼骨模驱动快离子输运的数值模拟研究

考虑包含动理学效应的鱼骨模结构,使用导心轨道程序 ORBIT,在磁面坐标下研究了不同的扰动模 幅度、频率对快离子再分布的影响,并分析了粒子与扰动发生共振的条件。模拟得出,鱼骨模扰动会使快离子在 实空间、相空间中发生再分布,芯部( ψ_p/ψ _w≤0.2 ,ψ_p 为极向磁通,ψ_w 为最后一个闭合磁面的磁通)快离子密 度下降约 20%,中间磁面位置上( ψ_p/ψ _w≥0.2,ψ_p/ψ _w≤ 0.6)的快离子密度增加约 7%;通过扫描频率发现,相空间中快 离子的再分布对模式频率敏感,并分析了快离子与鱼骨模扰动共振的条件。