基于SIM300的煤矿监测监控系统

提出了以SIM300 GSM通信模块结合CAN总线技术实现煤矿无线监测监控系统的技术方案,阐述了系统的实现方法、硬件结构、各模块及软件运行方式.该系统利用CAN总线网络采集各节点传感器测量信息,并通过GSM无线通信模块实现煤矿远程监测监控运行情况.     

基于GSM的无线抄表系统安全性的设计、

将GSM移动通信技术和Meter—Bus总线协议用于远程无线水表抄袁系统,可以对用户用水量进行有效的实时监控,减少人力物力,简化布线,实现数据和能量共同传输。为了实现远程无线抄表,采用光电直读技术计量水表数据,Meter-Bus总线读取水表数据,GSM通信网络发送水表数据三者结合的方法,通过微控制器的综合管理,得到稳定可靠的远程无线抄表系统;对数据短信采用对称加密算法,CRC校验、插入随机数、异或、字节置换和映射的方法实施加密操作,提高了系统安全性,适合以MCU为核心的远程抄表系统。     

气象环境监测远程数据采集系统

针对小区域范围气象环境监测问题,设计了一种气象环境检测远程数据采集系统。该系统以MSP430单片机为控制核心,利用多种气象环境传感器采集相关信息参数,并通过NRF24L01无线收发模块和GSM通信模块实现了对所测气象环境数据的远程无线传输。实验结果表明,该采集系统实现了小区域气象环境参数的实时无线监测,测量精度高,稳定性好。     

广播发射台天线区调配室无线监测及防盗系统设计

为了实现对距离广播发射台较远的天线区设备进行远程监测和看护,本文利用多种无线传感器、GSM/GPRS网络、INTERNET网构建了天线区调配室的远程监测及防盗系统。该系统通过GSM短消息的方式向发射台值班人员发送报警信息,通过GPRS通信方式向发射台机房监控平台发送报警数据和执行远程监控。     

污水监测实时数据采集系统的设计

针对当前污水监测的特点与需求,设计了一种基于多传感器数据采集技术,及GSM网络和短消息技术的污水监测远程实时数据采集系统。通过对监测现场传感器数据的采集、分析和处理,实现对污水的酸碱值、流量、氨氮含量等参数的监测,并能够利用GSM模块TC35与远程监控中心进行无线通信,满足污水实时监测的要求。     

基于TC35和nRF24L01的远程智能监控系统设计

文中自主设计了一种基于GPRS模块TC35和无线射频模块nRF24L01的远程智能监控系统,实现了对远程监测量的采集与监控,数据传输处理和管理控制。系统运用单片机组成数据监控系统,结合无线射频模块nRF24L01,通过GSM网络以短信的形式完成远程数据的传输和系统的远程控制。重点介绍了系统的框架结构与设计原理,以及硬件电路与源程序设计。本系统具有较高的扩展性以及性价比,适用于各种环境监测的嵌入式应用。     

水位自动监测系统的研究与设计

利用超声波技术设计了一种多从结构的水位自动监测系统,系统主要由数据中转站和水位数据采集终端两部分组成。水位采集终端通过超声波方式采集水位,将采集的水位数据通过无线传输给数据中转站,然后由数据中转站发送至远程终端。实验表明,系统能够实现水电站水位监测和数据传输功能,且系统具有传输数据精度高和无线传输及远程监控的能力。     

GPRS技术在配电自动化中的应用设计

分析了远程抄表系统的组成、硬件配置、软件设计、工作原理、功能以及技术性能。给出了通过下位机和无线收发模块来采集、整理数据,并通过无线MODEM模块经GSM网与上位机进行通信,从而实现水电公司远程抄表功能实现方法。     

一种改进型水坝监测系统

为保证堤坝安全运行,提出了一种基于分布式传感光线与GSM/GPRS网络的实时监测系统.该系统对水坝渗漏进行监测,能够准确及时地获取堤坝状态信息.介绍了分布式光纤传感基本原理,DiTtSt-STA202光纤分析仪及GPRS无线模块.使用DiTtSt-STA202完成堤坝数据采集,通过内嵌TCP/IP的GPRS模块实现数据远程传输,在检测数据达到预警值时通过GSM网络短信预警,编写基于CS结构的控制中心软件,完成数据的远程传输和本地处理.实际使用结果证明本系统运行良好,完成了设计要求.     

一种基于ZigBee技术的智能家居系统设计

系统以微控制器CC2530F256为核心,将温湿度传感器、烟雾浓度传感器等各传感器节点将数据采集完成后无线发送给ZigBee协调器;通过串口将采集到的数据信息上传给上位机,再通过电脑端上位机管理软件对各传感器节点设施进行相应的控制。用户可在PC端上位机上远程实时监测室内环境数据,实现家居的智能控制,整个系统具有较强的抗干扰能力及可靠性,可适用于智能家居应用领域。     

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.