基于单片机的单总线多点温度测控系统

本课题主要介绍基于AT89C52单片机和DS18B20数字温度传感器的多点温度采集系统.该系统利用AT89C52单片机分别采集各个温度点的温度,实现温度显示、报警等功能.它以AT89C52单片机为主控制芯片,采用数字温度传感器DS18B20实现多路温度的检测,测量精度可以达到0.5℃.该系统采用了LCD1602A液晶显示模块,LCD1602A作为显示器,形象直观的显示测出的温度值.基于AT89C52单片机的单总线多点温度采集系统具有硬件组成简单、多点温度检测、读数方便、精度高、测温范围广等特点,在实际工程中得到广泛应用.     

基于nRF905的小区周界防越报警系统

本文以AT89S52单片机和无线数传芯片nRF905为核心,提出了一种小区周界防越报警系统的设计。重点介绍了系统结构和功能,无线数据通信模块设计以及系统软件设计,实现了点对多点形式的小区监测报警系统。     

基于AT89S52单片机的无线通信报警监控系统的设计与实现

提出一种基于AT89S52单片机的无线通信报警监控系统设计方案,利用GSM无线通信网络,可以随时向指定手机号码发送报警信息。该智能化方案适用于无人值守岗位和少人值守岗位的监控管理,以此降低管理成本,提高报警的实时性。     

基于nRF905的温湿度无线数据传输系统

为提高温湿度测量效率,降低系统的成本,提出一种采用无线技术组建温湿度传输系统.系统以AT89S52单片机为主控制核心,通过控制温湿度传感器STH10采集环境的温湿度,利用单片机AT89S52的IO模拟SPI协议与nRF905进行数据交换,从而完成无线数据传输系统的数据发射和接收过程.测试结果表明:系统具有良好的可靠性和...     

由AT89C52单片机组成的智能呼救系统设计

从系统硬件设计和软件构成上,介绍一种以AT89C52单片机为核心,通过无线遥控方法实现对预设电话自动拨号报警的智能呼救系统.系统提供了患者在紧急情况下无法使用电话报警时的一种报警手段.由用户预设的多组电话号码作为语音报警对象,预录可长达20 s的语音信号来说明患者所处地点及病情,并通知患者家人.     

应用nRF24L01设计的智能灭火小车

在此的设计采用AT89S52单片机,由n RF无线通信模块,多传感器检测模块,灭火设备模块和电源驱动模块组成。通过烟雾报警系统的无线发射模块与智能灭火车本身的无线接收模块之间建立的的无线通信迅速得到房间着火的信号,然后启动相应程序,通过超声波传感器测距检测前进,红外传感器寻找火源,实现完整的灭火过程。     

基于AT89S52的温湿度检测系统的设计

以AT89S52为系统的核心,采用DS18B20温度传感器和湿度传感器来检测温度和湿度,并通过6个共阳极数码管实时显示当前的温度与湿度值。系统还采用了ISD1420语音播报技术。在检测到实验室的温度或湿度过高/过低时通过语音播报来报警,同时继电器立即切断电源,实现系统的保护。     

室内温度多点检测系统设计

温度检测目前广泛应用于工农业生产及人民生活的的各个领域.介绍了以DS18B20和AT89C52单片机为基础设计实现多点温度检测与分析报警功能的基本过程,阐述了系统的基本组成及硬件、软件设计过程,并完成了系统功能的实验室测试,结果表明该系统能够实现小型区域内的多点温度检测与温度超限报警,可应用于对环境温度要求严格的病房、居室、办公室、小型仓库等场所.     

基于AT89S52和nRF24L01的无线温度监测系统

基于AT89S52单片机和射频芯片nRF24L01模块设计了一种的低功耗无线温度监测系统。该系统能实现在恶劣条件下的实现对温度的远程采集和无线传输,并可利用RS-232串口与PC联机。它具有电路简单、功耗低、数据传输可靠性高等特点,能满足恶劣条件下的环境温度监测的要求。     

基于AT89S52单片机的红外遥控温度报警器的设计与实现

温度报警器系统以AT89S52单片机为主控制器,对温度报警和时间的显示、调整进行控制。采用高精度DS18B20为温度传感器,实现对环境温度的实时检测与采集,通过12864液晶显示温度和时间,当实时温度高于温度报警上限或低于下限时可利用蜂鸣器进行报警。通过红外遥控可以修改温度报警上限和下限、时间参数以及设置闹钟。本设计的创新点是增加了用VC6.0开发的上位机,在计算机上显示出时钟、温度计和视频界面,构成友好的人机界面。因此,本系统具有很高的实用价值。     

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.     

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.     

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.     

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.     

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.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks