AS-Interface现场总线及其在低压配电与电控系统中的应用

介绍面向工控网络最底层的AS-Interface现场总线的系统构成、物理介质、电源数据传输方式及其性能和特点.AS-Interface现场总线适用于由一个控制器连接多个二进制传感器和执行器的典型要求.应用AS-Interface现场总线能组成一个在空间上独立的由网络实现两部分逻辑运作的低压配电与电控系统.     

Capturing Attention When Attention "Blinks".

Four experiments addressed the question of whether attention may be captured when the visual system is in the midst of an attentional blink (AB). Participants identified 2 target letters embedded among distractor letters in a rapid serial visual presentation sequence. In some trials, a square frame was inserted between the targets; as the only geometric object in the sequence, it constituted a singleton. Capture effects obtained when the AB was most severe and when it was over were compared. There were 3 main results. First, capture occurred even when the AB was crippling, suggesting that a singleton exogenously engaged attention even when processing of a previous target was continuing apace. Second, when the singleton contained the key target feature, capture effects were clearly manifest. Third, even when the singleton did not possess the key target feature, it still succeeded in capturing attention, although the effects were both feeble and fleeting. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

SWP-LE智能流量积算控制仪的应用

本文主要介绍了SWP-LE系列表计的实用功能、工作原理及实际操作中的注意事项,论述了该表计在生产中的应用价值.     

基于MSP430单片机的便携式智能设备的设计

以商务大楼为应用背景，介绍了一种通用性很强的便携式智能设备的设计方法，该系统可对机电设备运行，保安签到(巡更)，环境(卫生，绿化，设施)管理实施适时监控等，实现商务大楼的职能化管理，文中详细阐述了系统的硬件结构，软件流程等相关技术，并着重说明了该设备的巡更功能和串口通信。     

RS232串口通信在摩托车排放测试中的应用

针对传统的摩托车排放检测硬件电路复杂,易受干扰的不足,提出了一种新型的串口通信的摩托车排放测试方法.将工控机和排放仪利用串口线相连,利用MSComm控件编写RS232串口通信程序,实现了工控机对排放仪数据的采集、数据显示和结果判断.实际运行结果表明,该方法硬件电路简单、成本低、传输数据不易受干扰.     

直流输电线路故障对电信线路感应的计算

直流输电线路对电信线路的危险影响、影响机理和计算方法,国内外资料及文献中尚无系统的介绍,我国也尚无统一的计算、设计标准。为便于工程设计,可以采用理论计算与实测对比相结合的方法推导出的简化公式进行计算。     

火电厂电气监控系统间隔层通信的现状与发展

对火电厂电气监控系统间隔层设备的通信接口方式及通信协议进行了介绍,并指出了其特点及发展方向。     

基于VB6.0的单片机与PC通讯的实现与应用

如何利用微机来实时监控工业现场，将被越来越多的企业所重视。为了达到用PC机与单片机通讯实现控制工业现场的目的，研究并分析了基于VB6．0的可视化性和通讯控件以及与单片机关于串行通信原理和程序设计特点，结合实例介绍了单片机与PC机的串口通讯，通过指令和数据的传送来控制工业对象的方法。通过实例可见取得了相应程序的应用效果，本研究的方法结论是：产品应用的代码具有广泛的应用价值，稍加改动即可用于其他系统。     

Fat-tree routing and node ordering providing contention free traffic for MPI global collectives

As the size of High Performance Computing clusters grows, so does the probability of interconnect hot spots that degrade the latency and effective bandwidth the network provides. This paper presents a solution to this scalability problem for real life constant bisectional-bandwidth fat-tree topologies. It is shown that maximal bandwidth and cut-through latency can be achieved for MPI global collective traffic. To form such a congestion-free configuration, MPI programs should utilize collective communication, MPI-node-order should be topology aware, and the packet routing should match the MPI communication patterns. First, we show that MPI collectives can be classified into unidirectional and bidirectional shifts. Using this property, we propose a scheme for congestion-free routing of the global collectives in fully and partially populated fat trees running a single job. The no-contention result is then obtained for multiple jobs running on the same fat-tree by applying some job size and placement restrictions. Simulation results of the proposed routing, MPI-node-order and communication patterns show no contention which provides a 40% throughput improvement over previously published results for all-to-all collectives.     

Broadband MIMO Antenna System for 5G Operations in Mobile Phones

A broadband 8‐antenna multiple‐input and multiple‐output (MIMO) system working for 5G new radio N77 (3.3‐4.2 GHz) in mobile terminals is proposed. In particular, each antenna element/unit consists of a monopole‐type meandered branch and an inverted U‐shaped self‐isolated antenna branch; and the antenna unit is fed by the meandered branch. The antenna unit has two resonances generated separately by each branch of the antenna unit. Since the monopole couples strongly with the self‐isolated antenna element that has the inherent self‐isolation characteristics, quite good isolation for the broadband 8‐antenna MIMO system can be obtained. The results such as antenna efficiency, radiation patterns, envelope correlation coefficient, and channel capacity are also presented.