基于GPRS和Internet的河流水情实时远程监测系统研究

为实现河流水位信息的实时远程监控,提出基于GPRS和Internet的河流水情实时远程监测系统解决方案。以STC12C5A60S2单片机作为系统控制中心,控制水位传感器进行河流水位信息的采集和处理,并控制GPRS通信模块进行数据传输。选用LC-SW1型水位传感器测量水位,使用SIM900A无线通信模块作为GPRS通信模块。监控通信网络通过具有公网IP的服务器建立,网络连接方式为TCP,将远程监测端的数据和监控端连接。该系统具有成本低和监控范围广的优点,能够满足应用的要求。     

基于GPRS的水文信息无线远程监测系统

研究设计了一种基于单片机与GPRS网络的水文信息远程监测管理系统,利用GPRS网络的短消息业务来完成水位、温度等参数的无线、远程和实时传输,实现测量结果的计算机管理,测量精度高。经过实际使用证明,系统具有较高的稳定性与实用性,从而为科学开发和合理利用地下水资源、有效地预防地面沉降及地裂缝的发展和政府决策提供了科学依据。     

池塘水位水温实时远距离监测装置的设计

针对目前池塘水位水温测量不精确、实时性较差等问题,设计一种池塘水位水温实时远距离监测装置。该装置包括硬件和软件两部分。硬件由单片机最小系统、水位传感器、水温传感器、SIM模块、液晶显示模块等组成。软件由主程序、温度采集子程序、液晶显示子程序等组成。水温水位采集模块将水位和温度信息传送到数据处理模块;通过键盘可以设置温度和水位的上下限值,单片机把水位和温度传感器传送来的数据经过处理,产生相应的显示代码驱动液晶显示模块进行显示,同时能将水位水温信息实时发送到手机上,并可进行远程控制。实践表明,装置工作稳定、监测距离远,池塘水位水温测量比较准确、实时性好。     

一种基于GPRS的森林防火远程数据传输系统

针对传统的地面巡防、航空巡防等森林防火监测方法实时性差、监测效果不理想等问题,设计了基于GPRS技术的森林防火远程数据传输系统,硬件采用SIM300模块和单片机,由单片机发送指令控制GPRS工作,GRPS通过网络与上位机进行通信,并将数据上传给上位机.上位机以C++ Builder为开发环境,采用Microsoft SQL Server 2000作为系统的数据库,用C++Builder连接数据库,并实现数据的存储、显示和查询.实验结果表明,该系统能够实时监测森林各项信息数据,能够在很大程度上预防森林火灾的发生.     

基于GPRS技术的矿用水文遥测系统的设计

针对煤矿井下地理环境复杂和水害事故多发等因素,将现代GPRS无线通信技术应用于煤矿水文监测系统中,设计了一种新型的智能遥测系统。通过高精度水温、水压传感器采集井下的水位、水温信息,结合低功耗芯片P89LPC936对数据进一步处理,并通过GPRS无线通信的方式传输到上位机中,上位机实时显示水位、水温等信息,实现对矿井水文信息的无线监测。实验表明,此系统具有良好的精确性和稳定性,能够有效地对矿井水文信息进行实时监测。     

基于GPRS技术的远程广播电视发射机监测系统的研究

为了对广播电视发射机的运行状态远程监控,设计了一种基于GPRS技术的远程监测系统,可以对发射机数据、温度、灰尘等信息进行实时采集和监测采集系统以单片机为控制核心,制用GPRS馍块实现数据的远程传输根据目前现状,验证了利用GPRS进行数据远程传输的可行与优势.     

基于51单片机精确水位控制系统的设计

文章设计了一种精确水位控制系统,具有水位监测、水位限设定和水位控制功能.采用LCD1602液晶显示器作为显示设备,能够实时显示测量得到的水位值.通过扩散硅压力传感器测量压强信息,进一步得到水位信息.此外,文章采用了主从机的设计,主机可以通过串行接口与从机进行数据交换和远程控制.系统实现了远程监测、控制水位的功能,能够较好地满足工业生产中对水位控制的要求.     

海水养殖环境水质实时监测系统的设计

海水养殖环境水质监测通常采用人工采样、实验室分析方法,存在实时性差、实验环境与实际环境有差异等问题。本文提出一种基于无线通信技术的远程水质实时监测方法。采用无线传感器网络作为主要通信手段,实现对养殖环境水质的远程实时监测。实验表明,该系统运行可靠、操作方便。     

基于GPRS的远程水温水位测控系统的研究

针对现代化小区对远程水温水位测控的需求,设计了一款基于GPRS的远程无线通信的水温水位系统。系统分为数据采集、无线传输和PC机显示三部分;数据采集部分采用STM32微处理器,实现对多路信号的数据采集;无线传输部分通过SIM900A模块接入GPRS网络,来实现对数据的传输;PC机实时显示水温水位情况。经测试,PC机与各测控制节点通过GPRS通讯,通讯稳定,可靠性高。     

基于Linux的家居无线安防监控系统的设计与实现

针对传统家居安防系统存在布线困难、建设及维护费用高、接收报警信息不及时等不足,提出一种基于GPRS和Linux的家居远程安防监控系统的设计方案。系统采用低功耗的MSP430单片机构成底层传感节点,高性能嵌入式ARM9处理器S3C2440A构成系统控制平台,构成以系统控制平台为核心的星型无线传感器网络。移植了实时性强、可扩展性好的嵌入式Linux操作系统,利用GPRS实现远程通信,采用SQL Lite数据库进行数据管理。实验测试表明,该系统具有实时性强、可扩展性好和报警成功率高的优点,能满足家居信息采集、远程报警和实时监控的要求。     

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.     

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.