地铁视频监控系统结构与故障

地铁视频监控系统为了应急突发事故,满足控制中心调度员监视、各车站值班员、电力调度、应急管理等监视的需要,以及为车站治安防控提供基础平台.它的正确运行是保证地铁运输安全及地铁维护的重要手段,同时还可以与防盗报警系统等其他安全防范体系同时运行,是一种先进的、防范能力极强的综合系统.在日常维护的过程中要认真仔细,同时也要熟记相关的注意事项,并且要了解一些常见的故障,能准确的处理故障.     

基于单片机的无线智能家居设计

本设计通过把无线网络技术结合到智能家居系统中,配合各种传感器采集家里的环境信息,然后通过无线的方法将信息传送给智能家居控制中心,可以实现火灾报警、煤气泄露、温度检测、智能调温、智能调光等一系列功能。当有火灾、煤气泄露发生时,该无线智能家居系统就会发出相应的报警声音,使得户主在得到报警信息以后,马上采取有效的应急措施,对紧急事故进行处理。能够弥补有线设备的缺点,具有成本低、鲁棒性好等优点。     

基于3G技术的远程环境污染应急监测系统的研究

根据环境污染事故应急监测的需要,设计了一套环境污染应急监测系统,包括无线通信网络、环境污染应急监测车和指挥控制中心。利用GPS/GIS来定位环境事故的位置、并且采用3G网路对事故现场的情况进行实施发送,指挥控制中心的远程指挥和决策支持等功能,能够很大程度上提高环境污染事故的应急处置效率。     

基于DTMF—MT8880的铁路道口远程报警主机的设计及实现

给出了一种基于电话线远程通讯的铁路道口自动报警主机的设计方案,该方案中的主机能识别列车运行方向,并具有系统故障自诊断、报警处理、记录报警和监控等功能,文中给出了该系统中主机设备的硬件结构和软件设计方法.     

基于VR技术的实验室安全事故应急处置系统设计

为了提高实验室安全管理和监控力量,提供安全稳定的科研环境,充分利用VR技术的高度逼真模拟功能,设计实现了实验室安全事故应急处置系统。系统中各种传感器采集实验室环境信息,基于该信息VR系统装置构建实验室安全事故模型库,模拟实验室安全事故数值,并实现事故现场可视化重建。在此基础上,实验室安全监控装置实现事故报警信息分析、处理后,依据报警信息切断实验室内电源、启动排风系统、清空实验室内所有人员。同时VR系统装置将模拟的安全事故应急处置现场可视化重建结果发送到反馈控制装置,为事故应急处置提供可靠依据。经实验验证,该系统处置5次实验室火灾与爆炸事故的平均总用时为8.83 s,7.0 s,低于对比系统,应急处置效率高。     

基于嵌入式的智能家居应急系统的研究与实现

随着物联网应用研究的深入,各类基于嵌入式的智能家居开发也成了研究的热门。文中研究设计了一套可以实时监控家中空气质量,并能对火情和燃气泄漏这些险情做出应急处理的系统;系统通过传感器检测家中空气质量,若检测到险情发生,则步进电机转动关闭燃气阀门,系统通过无线通信发送报警信息给用户,用户也可发送指令给控制中心主动关闭燃气阀门。文中介绍了系统总体设计,子模块硬件设计的同时,重点介绍系统电路的设计与软件的实现。     

内蒙古广播电视台广播智能化监测系统概述

智能化监测系统涵盖了广播信号监测硬件、软件、数据库、存储系统等各方面设备的运行状态监测和管理,在全程监控、自动报警、应急代播的基础上,开创性的提出了智能化维护辅助播出的概念,将极大的提高了一般值班技术人员发现和处理设备故障的能力,有效地保障了电台播出的安全、稳定、高效运行。     

消息报警平台的研究改进

原有的短信报警系统存在着硬件设备负载经常超限、报警通道单一、无信息交互功能、无报警维修建议等问题,影响了对报警故障的处置率。为此,基于提高报警信息的传达与处理能力的目的,采用了两种方法对系统进行改进:硬件部份采用两个设计成负载均衡的冗余短信猫(MODEM)设备作为支撑;软件部份则采用了消息传达保障技术、定位技术、知识库技术、多通道方式冗余报警方式对平台进行优化。平台经过优化改进后,通过生产实际检验,提高了报警信息的传达与处理能力,报警故障及时处置率由60%左右提高到了100%。     

消息报警平台的研究改进

原有的短信报警系统存在着硬件设备负载经常超限、报警通道单一、无信息交互功能、无报警维修建议等问题,影响了对报警故障的处置率。为此,基于提高报警信息的传达与处理能力的目的,采用了两种方法对系统进行改进：硬件部份采用两个设计成负载均衡的冗余短信猫（MODEM）设备作为支撑;软件部份则采用了消息传达保障技术、定位技术、知识库技术、多通道方式冗余报警方式对平台进行优化。平台经过优化改进后,通过生产实际检验,提高了报警信息的传达与处理能力,报警故障及时处置率由60%左右提高到了100%。     

火灾自动报警系统在地铁火灾中的实践探析

地铁火灾作为一种特殊的火灾灾害,给乘客和地铁运营安全带来严峻挑战。火灾自动报警系统在地铁火灾中发挥着重要作用,它通过感知器和探测器等设备,在火灾早期发现火灾迹象并及时发出警报,以促进快速应急响应和灭火处置。文章通过实践探析火灾自动报警系统在地铁火灾中的应用情况,深入探讨其实际效果与问题,期望能够为相关人员提供参考。     

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.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

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.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

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.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.