SCADA系统在西安天然气管网中的应用

通过对西安市天然气总公司SCADA系统设计的阐述，反映现代电子技术在燃气行业中的应用现状，与同行共同探讨如何更好地使用先进的信息手段改进燃气行业中的系统管理。     

小型燃气安全防护系统设计

现有燃气系统安全防护系统是通过间接地采集空气燃气浓度来判断燃气系统是否存在安全隐患的情况,这里设计一种燃气系统安全防护装置,该设计通过热电偶和流量传感器实时直接采集燃气系统的运行参数,然后由单片机判断燃气系统的工作状态,进而达到对燃气系统安全起到防护作用。通过仿真本设计能对各种情况做出相应的响应。     

广电智能媒资系统标签体系和数据结构的设计与实现

随着媒体行业的发展和数字化转型,广电媒体资产管理系统的智能化已成为行业发展的必然趋势。在智能化广电媒体资产管理系统的基础上,对标签体系和数据结构的设计与实现进行研究,更好地满足媒体资产管理的要求,提高管理效率和质量,为媒体行业的数字化转型提供有力支持。     

投影机运行数据管理系统开发与应用

为了更好地了解高等院校投影机运行情况,系统管理投影机数据,应设计开发一个数据管理系统。投影机运行数据管理系统就是一个具有存储管理、自定义检索和统计分析功能的管理系统,通过检索结果,分析数据,使高校管理人员对不同型号投影机的使用情况,进行清晰的对比分析,进而对投影机设备有个规范、准确、高效的管理。     

煤矿安全生产监测管理系统的设计与实现

针对煤矿地理环境复杂、井下作业环境恶劣,难以有效地对煤矿井下开采环境进行有效地监测和管理,设计并实现了煤矿安全生产监测管理系统。该系统采用MFC开发语言和基于GIS与组态软件开发技术,对目前的主从式监测管理系统进行了升级,对煤矿生产过程中的基本非安全因素可以进行全面地监控。该系统实现了分散煤矿信息采集的自动化,具有及时、高效、准确、基建投资少、运行成本低等特点,具有显著的社会效益和较大的经济效益。     

电力通信网络管理系统

现代电网能安全、经济、稳定的运行,电力通信具有十分重要的作用,电力通信管理系统能管理和经营业务信息、传递各种生产电力。经过这些年的发展,我国电力通信网已拥有了庞大的通信网络,建成了相当规模的光纤传输网、电话交换网等。然而,网内设备样式繁多,要求通信网络资源具有智能化、自动化和综合化管理功能。因此,需要设计一套综合的网络管理系统,全面地管理现有的网络设备。     

电子仪表行业供应链管理系统解决方案

本文主要介绍了电子仪表行业供应链管理系统的解决方案,包括电子仪表行业的现状及特点,供应链管理的设计思想及原则,针对电子仪表行业供应链管理系统的整体架构、功能模块。     

电力自动化设备综合监控管理系统研究

随着计算机、通信以及自动化技术的快速发展,电力系统运行逐渐朝自动化、智能化方向发展,电力自动化设备综合监控管理系统被越来越广泛地应用于电力系统运行,在保障电力安全生产中发挥着及其重要的作用。本文简要分析电力系统运行维护现存不足,并以某电力工程项目为例,对电力自动化设备综合监控管理系统的构成与功能实现进行简单分析,以供同仁参考。     

企业网环境下碳素行业生产管理系统的设计

通用的ERP软件与碳素企业特有的生产管理不相适应,且价格昂贵。以现有的企业网环境为基础,采用B／S模式的系统结构,将量化生产管理引入到碳素行业,所设计的软件系统以图表并用的形式自动产生包括利润、产出投入比等在内的各种生产、管理报表。一年来的运行表明,系统能很好地适应碳素行业的生产管理方式。     

公证行业办公自动化系统设计

公证行业办公自动化系统能够有效提高公证业务流程流转的便利性和高效性。本文通过分析公证行业自身的特点和具体要求,提出了公证行业管理系统铺设搭建的设计原则与目标。由于公证行业的独特性,本文讨论了公证行业管理系统需解决的具体问题。最后,文章讨论了公证行业管理系统铺设的要求,提高系统的针对性,对公证行业的发展具有非常积极的作用。     

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.