基于CC2530的滑坡监测系统设计

滑坡监测是一种常用的地质灾害监测与预报手段。根据滑坡体变化特点以及检测环境特征提出了基于CC2530的滑坡监测系统设计。该系统以CC2530为核心控制芯片,由采集节点、基站、监控主机和PC机4部分组成。多个采集节点和基站采用Zigbee协议组成无线网络,以传递采集的滑坡位移、土壤温度、土壤湿度、倾斜度等信息。基站利用G...     

机房动力环境监控系统应用研究

对机房动力环境进行了调查,分析了机房动力监控设备复杂、通信协议繁多、监控要求各异的特点,在现有通信网络基础上,建立通信与监控平台,实现了对机房动力环境进行集中监控.该方案具有完善的自动监测和控制功能,对发生的各种事件能进行实时语音、电话、短信报警,并实时记录时间,有效的提高了监控系统的可靠性,实现了对机房设备的统一监控和科学管理.     

一种LabVIEW的铁路电源屏监控平台设计与实现

为了更好地保障铁路信号设备和供电设备,确保对信号设备的供电状况进行有效的监控,提出了一种基于Lab-VIEW的铁路电源屏监控平台。该电源监测系统最大的优势在于将实时监测和在线频谱分析功能结合起来,完全实现监测的自动化和智能化。该电源监测系统能够自动存储实时采集到的信号,对存储的采集数据进行谐波失真分析,并且能够通过以太网实现数据实时上传PC机,将来还可以扩展快速检索异常值等功能,能满足铁路站点现场对电源实时监控的要求。     

基于DSP技术的UPS监控与管理

介绍了基于DSP技术的UPS监控与管理的功能及实施方案。该系统可以实现对UPS的自动监测、自动生成数据报告,并对计算机数据进行自动保护及自动备份功能。     

非法电台自动监控系统设计

针对目前非法电台自动监控系统的不足和局限性,设计了一种具备电台异常信号自动识别和非法电台自动定位两个重要功能的非法电台自动监控系统.论述了系统的作用和组成、实现的主要功能,监测设备的组成和工作原理,对监测前端的关键技术做了深入研究,提出了一种全新的非法电台实时监测定位设计思想,从而实现了非法电台实时监测定位的自动化.     

西藏电视发射台智慧运维监控系统的实现

阐述西藏电视发射台智慧运维监控系统的实现方法.该系统实现对台站内发射机运行状态、电视节目信号源、发射播出信号以及发射台电力、环境、内外安全等进行实时监测、监控,台站各子系统出现故障时,运维监控系统能自动告警、自动切换,可以实时查询和统计各子系统的状态数据、告警数据.该系统有效提高了西藏电视发射台的工作效率和管理水平,增强了台站的指挥调度能力,更好地保障了台站的播出安全.     

天线馈管自动充气系统的改进

本文主要介绍一款天线馈管自动充气系统的功能和原理,以及通过PLC实现对其工作状态自动监控的方法.该系统在我台工作两年来,运行稳定、监控准确,有效保证了天馈线系统的可靠运行.     

光纤光栅传感技术在滑坡监测中的应用

设计了一种应用于滑坡监测的光纤布拉格光栅传感系统,利用光纤光栅反射波长与应力具有良好线性关系的特性,在滑坡体变形的不安全点安装FBG传感器,获得应变信息,实现对滑坡的监测.在理论分析的基础上,对纯弯曲梁进行了应变测量实验.实验结果与理论分析一致,表明系统具有很好的可靠性和灵敏度.     

滑坡形变的升降轨时序干涉合成孔径雷达监测与分析

采用升降轨时序干涉合成孔径雷达（InSAR）技术对金沙江某水电站库区边坡的滑坡形变进行识别和监测。研究结果与研究区历史滑坡地质调查划定的滑坡体范围和全球定位系统（GPS）监测成果相符,说明InSAR技术在山区水库边坡形变的监测中具有可靠性和实用性。其中新建滑坡体形变速率较大,最大年平均视线向形变速率可达198.90 mm/a。结合同时期GPS数据验证InSAR监测新建滑坡结果精度,得出两者沿视线向累积形变量差值的均方根误差为39.10 mm,最大差值位于XJ17点为56.65 mm。滑坡形变与日降水量及水库水位变化的相关性分析表明,新建滑坡体的形变呈周期性阶跃变化,在出现强降雨或水库水位的骤变后滑坡形变表现出滞后效应。该研究可为山区水库边坡形变监测工作及滑坡灾害预警提供新的高效的方法。     

基于物联网技术的城市燃气监控系统研究设计

为实现对城市燃气管网实时有效的监控,提出了将物联网技术应用到燃气自动监控系统中,对城市燃气监控现场数据进行实时监测,本文主要对基于物联网技术的城市燃气监控系统进行分析探讨.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.