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.     

WCDMA系统中功率控制的研究

功率控制是新一代无线通信网络的关键技术之一.在WCDMA系统中,如何有效地进行功率控制,在保证用户要求的QoS前提下,最大程度降低发射功率,减少系统干扰从而增加系统容量,是WCDMA技术中的重点.文中详细阐述了WCDMA系统中功率控制的原理、算法及存在的问题和相关研究方向,针对WCDMA系统内环功率控制、外环功率控制、上行功率控制、下行功率控制等进行了分析,提出了一种简单实用的外环功率控制算法.     

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.     

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.     

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.     

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.     

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.     

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.     

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.     

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.