MiniCore系列模块提供以太网和Wi-Fi版本

Digi International旗下的Rabbit品牌推出的“MiniCore”系列网络连接模块具有易于使用、体积紧凑、成本低廉的特点,适用于实时控制、通讯与网络连接等应用,例如能源管理系统以及智能建筑物自动控制系统。该系列产品包括中文版的说明文件、一套用于Dynamic C开发软件的中文版图形用户界面（GUI）及本地技术支持。     

高性能开放式示波器加快嵌入式调试

在目前中档示波器(350 MHz～2GHz)的市场上,解决方案还存在着一些不足,特别是在探测、发现、捕获以及搜索和分析的5个调试阶段,客户有更高的期望. 根据客户的需求,泰克(Tektronix)公司日前推出了全新的MSO/DPO5000系列示波器,升级的MSO/DP04000B系列以及新高带宽无源探头为加快嵌入式设计人员调试的每个阶段,提供更高性能和更多分析功能.     

最小外型全功能波形监测仪满足视频测试

一直以来,泰克(Tektronix)公司在不断地推动视频产业链的技术创新和演进。2010年推出了WVR8300/8200,支持立体3D视频测量。WFM/WVR6xxx/7xxx系列产品新增了音频响度测量。     

基于LabVIEW和OPC实时数据采集系统研制

系统介绍了在LabVIEW中通过DataSocket编程技术对OPC服务器进行实时数据访问,完成了数据采集系统研制。该系统已应用于某电机厂第一超速实验室大型汽轮发电机转子试验监控系统改造工程中。应用表明,该系统安全可靠,可广泛应用于各种监控系统中。     

Direct numerical simulation of fluid flow in a 5x5 square rod bundle

Characterization of parallel flow through rod bundles is of key importance in assessing the performance and safety of several engineering systems, including a majority of nuclear reactor concepts. Inhomogeneities in the bundle cross-section can present complex flow phenomena, including varying local conditions of turbulence. With the ever-increasing capabilities of high-performance computing, Direct Numerical Simulation (DNS) of turbulent flows is becoming more feasible. Through resolving all scales of turbulence, DNS can serve as a “numerical experiment,” and can provide substantial insight into flow physics, but at considerable computational cost. Thus to date, the DNS in open literature for rod bundle flows is relatively scarce, and largely limited to unit-cell domains. Since wall effects are important in rod bundle flows, a multiple-pin DNS study can expand understanding of rod bundle flows while providing valuable reference data for evaluating reduced-resolution techniques. In this work, DNS of a 5x5 square bare rod bundle representative of typical light water reactor fuel dimensions was performed using the spectral element code Nek5000. Turbulent microscales based on an advanced Reynolds-Averaged Navier–Stokes model were used to establish the required DNS resolution. Velocity and Reynolds stress fields are analyzed in detail, and invariant analysis is used for further investigation into flow physics. The results show stark changes in the structure of turbulence in the edge gaps, suggesting the presence of gap vortices in these regions. In addition, turbulent kinetic energy budgets are presented to more fully illustrate the various turbulent processes. These data can prove useful for rigorous evaluation of lower-fidelity turbulence modeling approaches.     

半导体设备AMAT P5000死机故障分析及处理

著名半导体设备厂商美国应用材料公司生产了半导体制程设备P5000,该设备在实际使用过程中经常出现各种类型的死机现象。文章重点介绍了通过查询P5000设备的死机报告界面,对该界面进行分析,找出其中最关键的死机代码,并对常见的的死机代码进行原因分析,找出相应的死机原因。针对不同的死机原因提出相对应的可行性解决方案,最终快速、正确地解决常见的死机问题。     

基于GJB5000A二级的军用分系统项目过程与产品质量保证的实施

本文简单介绍了过程与产品质量保证这个过程域以及该过程域的实施方法.分析了军用分系统项目的特点,并结合这些特点重点介绍了项目PPQA如何在各个研制阶段对军用分系统项目实施质量保证活动.     

N-(6,7-methylenedioxy-3-quinazolinio)amidates—I synthesis spectra and some dark reactions

The title compounds 5 and/or their dimers 6, obtained by ring closure of the diacyl derivatives 4, exist in monomeric and dimeric forms in aprotic solvents, the positions of equilibria being dependent on the nature of the substituents and solvent. In several cases the pure monomeric and dimeric forms were obtained in the crystalline state. In protic solvents adducts of types 7 and 12 are formed, some of which are stable in the crystalline state. IR, NMR and mass spectra of compounds 5–7 and 12, and several dark reactions, are discussed.     

一种基于超级电容快速充电的循迹小车设计

文章利用MSP430F149单片机、TPS63020芯片、TCRT5000红外传感器、无线充电模块、计时控制电路、自启动电路、DC DC模块和直流电机等模块设计并制作了一个可循迹的电动小车动态无线充电系统,可通过灯光显示是否处于充电状态,小车检测到发射线圈停止工作时可自行启动,并在行驶期间实现动态充电,设计了电容"快充慢放"电路,能够完成预期功能,在电能输出效率最优情况下沿引导线稳定行驶。     

GJB5000A体系中基于V模型的软件测试流程

软件测试模型是软件测试工作开展的依据,合理的软件测试流程是提升软件测试质量的重要保障。文中通过对V模型及GJB5000A体系中基于V模型的软件测试流程进行了介绍与分析,结合当前软件测试工程实践,提出了一种更合理有效的软件测试流程。该流程能更好地管理软件测试过程的系列活动,提高了软件测试效率及质量。