基于MSP430无线照度计节点的设计

本文设计和实现了以MSP430单片机为核心控制器的无线照度计节点。该无线照度计节点采用LX1971可见光传感器作为照度探测器,采用MSP430G2553作为控制核心,并通过NRF24L01无线通讯模块实现数据的无线传输。实验表明,该无线照度计节点能准确地测量相应环境的光照强度,并具有低功耗的特点。     

基于51单片机的无线温度控制系统设计

本文介绍一种无线多点温度采集控制系统的设计和实现。本设计系统以STC89C52作为控制核心,采用传感器DS18B20进行实时温度检测,并通过无线收发芯片NRF24L01进行数据传输,从而实现温度数据的采集和无线远程监控。     

温度采集无线传输系统设计

为实现特殊环境温度采集,设计了一种基于NRF24L01射频芯片的无线温度采集传输系统,选用DS18820温度传感器,使用51单片机作为系统控制器,将温度值通过NRF24L01无线模块发送,接收系统通过NRF24L01接收温度值,并将接收数据在LCDl602液晶屏上显示,同时通过RS232串口发送到PC机。本文设计的无线温度采集系统具有硬件电路简单、设计成本低、功能稳定等优点。     

基于NRF24L01+的多点无线测温系统设计

利用NRF24L01+和AT89S51单片机构成无线测温模块,多点发送,一点接收,接收到的温度数据送到单片机,经过单片机处理后,再通过RS232串行通信发送至上位PC机接收程序加以显示。     

基于C8051单片机的无线心电监护系统设计

介绍一款低功耗无线心电监护系统,它由数据采集盒和PC监护终端两部分构成。数据采集盒在C8051F320单片机控制下实时采集心电数据．通过NRF24L01无线模块发送给PC监护终端。终端中的C8051F320通过NRF24L01模块接收心电数据．并由自带的USB接口将数据传送给PC机进行心电波形的显示和分析处理。该系统可实现多个病人心电信号的采集、存储和分析等功能,小巧便携、方便实用。     

基于无人机的无线动态数据传输系统总体设计

基于无人机设计独立于无人机控制系统的实时无线数据传输系统。以STM32微处理器和NRF24L01无线传输模块构建数据信息处理和数据无线传输的平台,加大对无人机飞行数据的采集,获取准确的飞行姿态和飞行环境的相关数据。     

基于AVR单片机的无线火灾报警系统

针对传统的有线报警系统存在误报、灵活性差和安全性及稳定性较差等问题。采用NRF24L01无线模块,设计了基于AVR单片机的无线火灾报警系统。该报警系统由两部分组成,分别为发射检测端和接收端。当有安全隐患时,如温度过高并超过阀值时,发射端通过NRF24L01无线模块发送隐患信息到接收端,接收端进行声光报警用来提示有安全隐患产生,同时利用GSM模块发送短信通知相关人员进行检查。测试结果表明,基于NRF24L01的无线火灾报警系统稳定性更强,可以广泛应用于现代建筑等领域。     

基于C8051单片机的无线心电监护系统设计

介绍一款低功耗无线心电监护系统,它由数据采集盒和PC监护终端两部分构成.数据采集盒在C805117320单片机控制下实时采集心电数据,通过NRF24L01无线模块发送给PC监护终端.终端中的C8051F320通过NRF24L01模块接收心电数据.并由自带的USB接口将数据传送给PC机进行心电波形的显示和分析处理.该系统可实现多个病人心电信号的采集、存储和分析等功能,小巧便携、方便实用.     

基于NRF24L01的多路无线智能抢答器设计

针对市场上有线抢答器节点扩充困难,而无线抢答器价格过高的问题,利用STC89C52单片机和NRF24L01无线收发模块设计出一个能够双工通信,自动检测、自动恢复、自动语音播报的无线智能抢答器系统,本系统具有成本低、节点扩充容易,经实验测试,性能稳定,能够满足各种抢答竞赛需求。     

基于无线通信的汽车后视镜控制系统

目前减小后视镜视野盲区是提高驾驶员行车安全的重要措施。利用无线通信技术设计了汽车后视镜控制系统,发射端采用方向盘转角传感器采集方向盘的转角数据,用NRF24L01模块实时发送数据;接收端采用NRF24L01模块对数据进行无线接收,利用STM32进行数据处理后,控制后视镜控制端的电机转动,使后视镜自适应地调整到最佳位置。经过测试分析后得出,采用无线通信技术的方式实现了汽车后视镜的自适应调整,减小了驾驶员行车过程中后视镜视野盲区。     

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.     

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.     

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.     

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