基于AT89C52下智能化电镀设备控制系统设计

基于AT89C52下智能化电镀设备控制系统是以AT89C52单片机为基本内核,利用串口通信技术实现电镀设备数据采集和控制手段智能化的智能控制系统.设计对电镀设备的温度、液位和位置等参数的检测、处理以及控制的智能处理方式进行了说明,并在重点阐述系统硬件构成的基础上,对如何利用串口通行技术实现单片机的数据传递进行了简单的介绍.     

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.     

基于单片机的温度控制系统设计

本设计以AT89C52单片机为控制核心,进行温度采集,信息显示和执行器控制.AT89C52是SST在美国推出的高度可靠的小扇区FLASH微控制器.具有72KB的超级闪存和1KB的RAM.RAM的进一步扩展可以满足嵌入式系统的操作系统操作条件.通过使用AT89C52单片机和新型测温装置设计多点温度控制加热控制系统,并根据...     

一种新型的USB通信技术研究

为了提高单片机与计算机之间的数据传输速度,设计了基于CH372芯片的USB通信技术来实现单片机与计算机之间的数据通信.采用CH372芯片与单片机AT89C52配合的方法设计了单片机端的硬件电路,开发了CH372芯片基于汇编语言平台的单片机端的数据收发程序和基于Visual Basic语言平台的计算机端的命令、数据收发程序.试验结果表明,该系统设计能够很好地实现单片机与计算机之间的数据传输.     

基于单片机的智能照明控制系统设计

该设计是用单片机AT89C2051联合AT89S52制作的夜用照明灯智能控制器,利用单片机的端口分别控制LCD1602标准时钟系统、可控硅和蜂鸣器,实现智能照明系统。由于该系统采用单片机对环境光亮度进行测试,并计算相关数据,进行判断,因此电路能随着季节的变化自动调节每天的开关灯的时间,从而减少电能的损耗。     

基于红外反射式光电传感器的智能循迹小车

介绍了一种智能寻迹小车的设计与实现。基于红外反射式光电传感器的寻迹原理,采用AT89C52单片机为核心控制器件,通过红外传感器检测路面信息,单片机获取路面信息后,进行分析、处理,最后控制步进电机调节转向和转速。实验表明：该系统抗干扰能力强、电路结构简单,能够准确实现小车沿给定的黑线快速、平稳行驶。     

基于AT89C52的嵌入式网络监控系统设计

针对网络监控设备不断向小型化、智能化发展,文中提出了一种结合单片机AT89C52与RTL8019网卡的新型嵌入式网络监控系统.该系统以TCP/IP协议为基础,单片机通过ISA总线与网卡通信来实现网络数据包的收发.实验证明该系统可以可靠地实现TCP/IP协议,并对网络进行有效的控制.     

一种智能识别电话机的设计

介绍了一种智能识别新型电话机的设计,以AT89C2051单片机为呼叫智能识别核心,通过单片机判断后控制拨号电路,实现呼叫智能识别功能.     

一种低成本的病床呼叫系统

基于STC89C52单片机设计了一款低成本病床呼叫系统。使用单片机控制语音合成芯片和液晶显示模块,通过ISD1760的FT直通操作模式录制语音信息,然后利用ISD1760的SPI模式接口与单片机的I/O端口连接通信,实现单片机对语音芯片的控制。同时加入留言功能,使呼叫系统更加人性化。样机测试表明,呼叫系统的稳定性高,解决了落后地区乡镇医院中病人得到及时护理的问题。     

ZigBee无线网络信息通信的单片机智能灯泡设计

针对现代对智能灯控的需求,本文采用AT89S52单片机实现智能灯泡主控电路设计,并引入ZigBee无线通信技术实现灯光数据的通信和传输功能,利用上位机实现智能灯泡系统的控制.本文重点给出ZigBee的CC2530数据信息采集和通信的硬件部分分析.     

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.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.