微型热电制冷器非稳态特性的热电模拟研究

在微型热电制冷器应用中,精密恒温器、医疗仪器、电子控制元件等的快速制冷以及在环境条件变化情况下的适应性调节,都体现了非稳态研究的重要价值.介绍了一种利用等效电路网络思想来研究微型热电制冷器非稳态特性的方法.首先基于热电模拟思想,建立了微型热电制冷器的等效电路模型,该模型综合考虑了结构尺寸、非控制端温度、控制端热流量、附加热阻、附加电阻、工作电流以及驱动源等因素对器件特性的影响.然后利用该模型分别分析了制冷与热泵模式下,控制端热量、非控制端温度、工作电流等运行条件随时间改变时,对微型热电制冷器非稳态工作特性的影响.并最终得出了控制端的负载、非控制端温度、工作电流等参数对控制端温度Tcs影响的基本规律,这为微型热电制冷技术的深入研究和应用提供了理论指导.     

基于VC＋＋的无人机便携式地面站设备的设计

针对无人机控制中灵活性的需求,在原有地面站结构的基础上,利用PC104作为硬件平台,融合虚拟串口、多线程编程、矩阵键盘等技术,设计了一种性能可靠、轻巧灵活的便携式地面站.利用PC104中的GPIO口加入矩阵键盘,该键盘可以控制无人机飞行的全过程.并且设计了地面飞控站部分的软件界面,包括功能菜单、虚拟仪表、控制区域等部分的设计,实现了虚拟仪表部分的数据显示功能.经过实际调试,整个系统运行良好,很好的实现了对无人机的控制.     

弱电系统中管道的设计

弱电系统有两类,一类是国家规定的安全电压等级及控制电压等低电压电能.一类是载有语音、图像、数据等信息的信息源以及家庭内采集、控制、管理及通讯的控制或网络系统等线路.针对弱电系统中管道设计,通过分析小区内的弱电管道设计,从管道选材、容量、数量、孔径大小以及管道结构等详细进行了阐述.     

一种精密流场维持系统的设计与应用

对一种精密流场维持系统进行了设计,包括软件模块、维持单元控制模块、供液控制模块、运动平台控制模块等,并通过这一控制系统实现了精密流场的建立、动态维持和撤销等功能.使用流场温度测量系统、流场压力测量系统、流场气泡观测系统对相关流场进行了测量与验证,测试结果表明,流场的温度梯度、压力波动、气泡数量等指标达到实验要求.     

基于PLC的步进电机控制系统设计

文章根据传统步进电机控制中的不足和缺点,将PLC直接控制技术运用于步进电机的控制.该系统解决了传统控制技术中的各部分硬件的设计、选型、接口匹配往往要花费设计者-很大的精力和劳动,接口信号的匹配以及各器件的质量等对整个系统的可靠性影响很大等缺点.根据PLC控制步进电机的控制特点及其原理,把软件控制和硬件电路互相结合起来,形成整体的控制,有效的克服了它们的缺点而发挥了它们的优势.本文详细阐述了该系统中PLC（西门子）直接控制步进电机的实现方法、系统的各部件的组成、各部件的连接情况.     

白光干涉测量控制系统的集成化设计

微纳技术的发展带动了微纳米检测计量仪器的发展,微纳米测量仪器的智能化、集成化和小型化是仪器研发中的共性问题.在白光干涉测量系统中,设计了基于STM32处理器的控制系统,该系统将原本分立的光源控制、相机控制和样品台控制等控制模块集成构建于一台控制器.针对白光干涉测量系统的控制需求设计开发了驱动电路、通信电路、光源控制电路和相机触发电路等.设计优化了信号同步、光源控制策略,从而提高了扫描同步性和测量稳定性.控制系统的集成化设计有效提高了光学三维轮廓仪的小型化和集成性,降低了仪器的制造和维护成本.     

浅析电饭煲的电子线路设计

本设计通过热敏电阻把温度信号转变成电压信号,再经转换把电压信号变成的数字信号,然后由控制继电器,达到温度控制工作.本电饭煲采用起伏加热模式,通过微电脑控制,模拟人工炊煮.电饭煲由普通型的内胆外露,发展到豪华型全包式,其中功能由单一煮饭功,发展到煮粥、蒸炖等,控制方式由简单机械控制,发展为微控制以及模糊控制等.电饭煲的原理是利用电能转变为内能,具有方便,环保卫生,对食品进行蒸、煮、炖、煨等功能.已经成为人们日常生活的电器,缩减了家庭煮饭时间.     

IP Over WDM解决方案的研究

本文介绍了IP over WDM解决方案的基本原理.不同于以往的文章,本文分别从数据(传送)平面、控制平面、以及管理平面3个功能层面描述了IP层与WDM网络层的融合方案.首先对数据平面的IP Over ATM、IP Over SDH、IP Over GbE等技术解决手段进行了介绍.随后,着重对控制平面的MPLambdas、ASON等解决方案进行了阐述.最后对基于管理平面的解决方案做了介绍.此外,文中对基于控制平面的解决方案与基于管理平面的解决方案进行了对比.     

基于模糊控制的电磁智能车设计

智能车控制是涵盖自动控制、模式识别、传感技术、计算机、机械与汽车等多个学科的复杂系统.为了实现对其很好的控制,文章提出了基于模糊控制的电磁引导的智能车控制方案.实际结果表明智能车运行性能优良.     

基于虚拟仪器技术的激光雷达测量控制平台

虚拟仪器具有性能好、集成度高、界面友好,控制方便、扩展性强等特点.设计了一个基于虚拟仪器技术的激光雷达控制平台,把激光雷达控制、检测、数据分析单元有机地组合在一起,通过计算机虚拟面板操作雷达系统控制、检测和数据处理单元,使得激光雷达控制更为方便安全,信号分析更加实时有效,建立了激光雷达的通用信号平台.     

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.     

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     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.