基于LabVIEW和Arduino的远程监控系统设计与实现

针对现场采集数据实时远程监控的要求,根据LabVIEW强大的功能模块和Arduino灵活易用的开发特点,提出以Arduino为控制器,采用Arduino软件与LabVIEW软件交互编程的设计思想。为解决LabVIEW在本地服务器Web发布的局限性,同时简化系统的硬件设计,增加使用的灵活性,使用云计算作为服务器,设计实现了一种基于LabVIEW和Arduino的无线串口采控和实时同步Web发布的系统。测试结果表明,该系统界面友好,运行可靠,可扩展性很强,可以在整个互联网上通过网页建立Web请求。     

基于配置文件的航天器供配电测试软件一体化设计方法

针对航天器供配电测试系统中信号种类繁多、软件构架通用性差的问题,设计了一种基于配置文件的软件设计方法,该方法适用于虚拟仪器应用软件的开发;软件涵盖了指令控制、参数测量、状态检测等功能,依靠对配置文件的修改,使得供配电测试系统根据需求进行调整;经实践证明此方法不仅提高软件的可扩展性、实现软件结构一体化,而且延长了软件的生命周期,在某航天器的供配电测试系统应用中取得了较好的效果;该方法为复杂的航天器供配电测试软件设计提供了一种通用架构。     

基于LabVIEW的支架结构安全监控系统设计

针对路桥施工过程中支架结构的安全性能问题,设计开发一套基于LabVIEW的安全监控系统,通过采集应变和倾角信息,全面地监测支架结构所承受的载荷与稳定性;软件的开发融合了多种技术,利用LabVIEW软件实现串口通信、GPRS网络通信、数据库访问、数据报警以及Web发布等功能,将无线传感器网络采集到的数据信息实时地反映给操作人员,并同时具备数据报警、查询等功能;测试结果显示,系统构建了一个包含10个传感器节点的ZigBee网络,并准确地获得了支架结构在受力变化时参数的变动,且实现了GPRS远程监控的功能,说明系统能够稳定、准确地对支架的应变和倾角信息进行监测,并具有良好的后续开发空间和应用前景。     

基于数据格式库的卫星通用测试软件设计

针对当前卫星地面测试软件开发周期长、成本高及缺乏通用性的缺点,提出了使用对象数据库进行卫星数据格式库设计,并基于此进行通用化的卫星测试软件设计的方法,详细介绍了软件的组成构架、各部分的功能、工作机理以及软件的工作流程;基于数据格式库的卫星通用测试软件具有良好的通用性,能够满足不同卫星项目的设计和测试需求,支持数据格式的快速变动和修改,实现卫星测试系统的快速开发,并具有良好的应用外延;实际应用表明,该软件可节省卫星研制和测试的时间和成本,提高卫星研制的效率,是对卫星通用化测试软件发展一次有益的探索和尝试。     

阻性电子负载卡的设计及其在航空测试中的应用

阐述了采用PCI接口芯片和FPGA技术研制阻性电子负载卡的方法,重点分析了基于FPGA芯片控制逻辑的实现方法,总结了使用接口芯片开发PCI总线板卡的关键要点和开发驱动软件的步骤;通过在航空测试系统中的实际应用,验证了该PCI阻性电子负载卡的设计能够达到航空修理领域对电阻模拟的实时响应性、准确性的需求。     

基于LabVIEW的空间相机试验测控系统设计

在LabVIEW开发环境下,基于虚拟仪器和PXI总线,采用National Instrument(NI)公司的数据采集卡,设计了一个空间相机试验测控系统,实现了硬件设计和软件功能。该系统具有多个通道,可测试温度、应力、应变等多种参数,能实现测控参数设置、数据采集与处理、数据及曲线显示、信号分析与处理、远程通信等多种功能。在某空间相机分系统热平衡试验中,用于测试、控制36个热敏电阻测温点和14个热电偶测温点的温度。结果表明,系统达到了0.5℃的控温要求;热电偶的标定和标准水银温度计的比对结果表明,本系统测温精度可达到0.15℃。与传统的文本语言相比,利用LabVIEW节省了大约80%的时间。本系统具有延续开发能力和可移植性,其设计方法能为其它测控系统的开发提供参考。     

基于LabVIEW的空间相机试验测控系统设计

在LabVIEW开发环境下,基于虚拟仪器和PXI总线,采用National Instrument(NI)公司的数据采集卡,设计了一个空间相机试验测控系统,实现了硬件设计和软件功能。该系统具有多个通道,可测试温度、应力、应变等多种参数,能实现测控参数设置、数据采集与处理、数据及曲线显示、信号分析与处理、远程通信等多种功能。在某空间相机分系统热平衡试验中,用于测试、控制36个热敏电阻测温点和14个热电偶测温点的温度。结果表明,系统达到了0.5℃的控温要求;热电偶的标定和标准水银温度计的比对结果表明,本系统测温精度可达到0.15℃。与传统的文本语言相比,利用LabVIEW节省了大约80%的时间。本系统具有延续开发能力和可移植性,其设计方法能为其它测控系统的开发提供参考。     

远程控制在大功率固体激光加工系统中的应用

针对目前大功率固体激光加工系统的特点,结合相关产品使用的网络构架,研制开发了一套基于Internet的远程监控系统。它是一种将网络技术与系统监控相结合,在异地通过Internet实时监控系统的运行状态,并为系统的故障诊断提供依据的技术。该系统具有高效性、准确性和实时性等特点。在设计方面采用了先进的软件构架,可以实时监控激光加工系统的操作情况和参数状态;查询激光加工系统的当前数据和历史数据,并对开放权限的数据进行修改;通过和用户在线沟通完成疑难问题的解答。     

基于LabVIEW的CSRm电源输出监测系统

针对兰州重离子加速器原有的CSRm电源监测系统进行改造, 设计了基于LabVIEW的一体化电源监测系统。系统采用LabVIEW作为软件开发平台, 硬件为NI公司的PXI-6133多功能数据采集卡, 采用C/S模式进行系统搭建。前端服务器程序负责进行电源输出数据的采集和基本处理, 并将数据通过DataSocket传输协议上传;客户端程序负责数据采集卡控制参数的设定、电源数据的集中显示以及数据存储。根据现场测试可知, 该系统工作稳定可靠, 操作界面简洁方便, 易于管理, 功能完善。     

PCI总线锅炉水位系统的多样化控制及其组态仿真实现

针对现有锅炉水位实验系统存在控制装置交互性差、控制算法单一等缺点和不足,作者提出采用基于PCI总线数据卡构建锅炉水位控制系统的控制方案,给出了PCI总线锅炉水位控制系统的设计方案。在此基础上,详细阐述了锅炉水位实验系统的模糊控制方案,给出了模糊控制器的设计过程和设计步骤。最后,使用组态软件将锅炉水位控制过程进行可视化,生动直观地展示锅炉水位的控制全过程。运行结果表明：采用模糊控制和组态软件的PCI总线锅炉水位控制系统具有控制算法灵活、控制过程可视、控制效果理想等特点。     

Self-organization of five species in a cyclic competition game

Cyclic competition game models, particularly the “rock–paper–scissors” model, play important roles in exploring the problem of multi-species coexistence in spatially ecological systems. We propose an extended “rock–paper–scissors” game to model cyclic interactions among five species, and find that two of the five can coexistent when biodiversity disappears, which is different from the “rock–paper–scissors” game. As the number of fingers is five, we named the new model the “fingers” game, where the thumb, forefinger, middle finger, ring finger, and little finger cyclically dominate their subsequent species and are dominated by their former species. We investigate the “fingers” model in two ways: direct simulations and nonlinear partial differential equations. An important finding is that the number of species in a cyclic competition game has an influence on the emergence of biodiversity. To be specific, the “rock–paper–scissors” model is in favor of maintaining biodiversity in comparison with the “fingers” model when the variables (population size, reproduction rate, selection rate, and migration rate) are the same. It is also shown that the mobility and reproduction rate can promote or jeopardize biodiversity.     

Contrastive analysis on tone between Putonghua and Taiwan Mandarin

The differences of the pitch and duration of Chinese syllables between Putonghua （PTH） and Taiwan Mandarin （TM） were studied. The speech materials to be used are not only isolated syllables, but also sentences. The results reveal that： For the isolated syllables, T1 and T2 in TM are influenced by Minnan dialect, therefore their pitch are lower than those in PTH. T3 is fall-rise in PTH, while it is fall in TM. Moreover, the syllable duration sequence for different tone is T3〉T2〉T1〉T4 in PTH, while it is T1〉T2〉T3〉T4 in TM. For the syllables in sentences, T2 is mid-rise in PTH, while it is mid-level in TM. And the T3 is longer than T4 but shorter than T1 or T2 in PTH, while it is the shortest in TM. Furthermore the effects of prosodic phrase boundary on duration for different tones are almost the same in PTH, but the lengthening part of T1 or T2 is longer than that of T3 or T4 in TM.     

Experimental study on downstep in Chinese intonation

Downstep in pitch contour of Chinese Putonghua is examined using subtly designed sentences by controlling tone combinations. The results show both automatic and nonautomatic downstep phenomena exist in Chinese. In non-automatic downstep, low tones compress downwards the pitch range of the following syllables. and the main influence of downstep is on topline. Low tone not only lower the topline behind it, but also raise the high tones before it, the effects are compatible with each other. In automatic downstep, the topline of pitch contour in intonational phrase is presented as a linear downtrend, but it differs among speakers due to the effect of personal stress practice. In comparison with downstep phenomenon in other tone or non-tone languages, the downstep ratio in Chinese is not constant, and the domain of downstep is not limited within the adjacent tones.     

Abelian-Higgs phase of SU(2) QCD and glueball energy

It is shown that SU(2) QCD admits an dual Abelian-Higgs phase, with a Higgs vacuum of a type-Ⅱ superconductor. This is done by using a connection decomposition for the gluon field and the random-direction approximation. Using a bag picture with soft wall, we presented a calculational procedure for the glueball energy based on the recent proof for wall-vortices [Nucl. Phys. B 741(2006)1].     

Theoretical analysis and simulation of conjugate heights for dual-conjugate AO system in lidar

A multi-conjugate adaptive optics （MCAO） can offer a possibility of widening field of view （FOV） characterized by the isoplanatic angle, and the choose of conjugate height becomes a basic problem for MCAO, which influences the size of iosplanatic angle. Considering the application of lidar, the isoplanatic angle＇s expressions of two deformable mirrors （DMs） MCAO for uplink and downlink are deduced. The effects of conjugate heights for dual-conjugate AO are thoughtfully discussed, and the isoplanatic angles are further analyzed. The results show that the isopanatic angle varies with the conjugate height and reaches the maximum as the conjugate height is at the optimal altitude. Moreover, the optimal conjugate height changes with the propagation distance.     

Quick single-photon detector with many avalanche photo diodes working on the time division

Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution (QKD) system.A new idea is put up to design a quick single-photon detector.This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes (APDs).Au of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal.The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector.The single-photon prompt detection can come true for high repetition-rate pulses.The applying of this detector will largely raise the code rate of the QKD, and boost the commercial use.     

Signal generation in an isotropic medium in scanning electron acoustic microscope

Based on the research in Ref. [5][Materials Science and Engineering, 1989; A122： 57 63], an improved model of heat source is set up, the different modes of Lamb wave in an isotropic sample generated by a chopped electron beam at frequency f are obtained with integral transform and normal function expansion method, and the output signal of PZT coupled at the back surface of the sample is found out. The generation mechanism of SEAM （Scanning Electron Acoustic Microscopy） signal is discussed. It shows that the SEAM is a near field imaging technique with high spatial resolution and its best lateral spatial resolution is about 2√2α （α is the radius of the focused electron beam）. Some of experimental results of SEAM images are presented in the paper and it shows that the spatial resolution of SEAM is better than 0.5 μm and smaller than the thermal diffusion length of the sample. Therefore the character of near field imaging in SEAM is also proved experimentally.     

High efficiency filtering using two-dimensional photonic crystal coupled cavity structures

Transmission spectra of coupled cavity structures (CCSs) in two-dimensional (2D) photonic crystals (PCs) are investigated using a coupled mode theory, and an optical filter based on CCS is proposed. The performance of the filter is investigated using finite-difference time-domain (FDTD) method, and the results show that within a very short coupling distance of about 3λ, where λ is the wavelength of signal in vacuum, the incident signals with different frequencies are separated into different channels with a contrast ratio of 20 dB. The advantages of this kind of filter are small size and easily tunable operation frequencies.