一种测试生理刺激反应时间的电路设计

随着电子技术的飞速发展,在集成技术高度发达的今天,人们已越来越不满足使用传统的通用逻辑器件的设计。FPGA的应用是现代教育发展的一种趋势,通过生理刺激反应时间测试仪设计实例,比较详细地说明人体受到刺激反应后在数字逻辑电路的实践应用。通过本设计,有意识地激发学生学习的兴趣和积极性,培养他们熟练运用EDA技术的能力,以满足时代的需要。     

仿真软件在《数字电子技术》课程教学中的应用

在此针对当前《数字电子技术》课程的教学现状以及存在的问题,通过实例详细介绍了Proteus仿真软件在《数字电子技术》教学过程中的应用。不仅增强了教学的直观性、生动性,激发了学生的学习兴趣,也有利于培养学生的创造性思维,更好地落实因材施教,提高课堂教学的效率和质量,为《数字电子技术》课程的教学提供了一种新的尝试。     

简易数字钟制作

为了让学生对数字逻辑电路的应用有更加深入的了解,主要应用分频器和数字钟专用集成电路设计制作了简易数字钟电路.通过分析数字电子钟的电路工作原理,使学生加深对分频器和数字钟专用集成电路的理解;通过数字钟电路的模块化设计,可以提高学生应用数电进行简单电路设计的能力.实践证明,通过对数字电子钟的实际制作,能够进一步强化学生的动...     

简易数字钟制作

为了让学生对数字逻辑电路的应用有更加深入的了解,主要应用分频器和数字钟专用集成电路设计制作了简易数字钟电路。通过分析数字电子钟的电路工作原理,使学生加深对分频器和数字钟专用集成电路的理解;通过数字钟电路的模块化设计,可以提高学生应用数电进行简单电路设计的能力。实践证明,通过对数字电子钟的实际制作,能够进一步强化学生的动手操作和分析解决问题能力。     

一种音乐播放控制电路的设计

简谱是一种比较简单易学的音乐记谱法,数字简谱用不同的点和线段配合八个阿拉伯数字0～7构成音符,记录并表示千变万化的音乐曲子及其基本音乐元素。通过音乐播放控制电路的设计实例,比较详细地说明音乐播放控制电路在数字逻辑电路的实践应用。通过该设计介绍用频率信号驱动蜂鸣器演奏电子音乐的原理,使读者掌握模可变计数器的设计方法以及只读存储器（ROM）的应用。     

具有数据中继功能的三相数字电表设计

设计了一种具有数据中继功能的三相数字电表.该电表巧妙地引入了无线收发器nRF905,结合特定多功能电表通信协议,有效解决了自动抄表系统中485抄表通信成功率低、不能即连即通的问题.电表可以在-40～80℃正常稳定地实现电参数测量和数据中继,电表通过软件校正后,其有功测量精度满足0.2、0.5 S.数据中继在数字电表设计上是一个创新点,该电表具有较高的实用价值和很好的应用前景.     

基于树莓派和Python的数字均衡器实验设计

传统的实时性数字音效处理系统主要基于DSP硬件平台进行开发，对于本科生而言开发难度和成本都较高，针对此问题，提出了基于树莓派和Python的数字均衡器综合实验设计方案。首先，提出了一种基于尖峰滤波器模型的均衡器方法；其次，从理论角度阐述了IIR数字滤波器形式的设计过程，并通过窗函数法转换为FIR数字滤波器；最后，借助树莓派数字音效处理系统，印证了实验方案的可行性和拓展性，提高了学生的理论应用能力和创新实践兴趣。     

超宽带数字正交变换的一种高效实现结构

介绍了一种基于频域数字信道化的高速数字正交变换器的设计方法和实现结构。这种结构利用数字正交变换的优化算法，通过合理的滤波器组设计，在满足应用要求的前提下，极大地拓宽了正交变换的有效处理带宽，同时大大地减少了计算量和硬件电路资源的消耗。这种正交变换器不需要高精度的正交数字本振（NCO）。此技术的实现在宽带接收机和实时信号处理等领域具有重要意义。     

基于MATLAB的《信号与系统》课程实验设计

利用Matlab软件仿真环境设计了信号与系统课程实验系统.对FIR数字滤波器和IIR数字滤波器的MATLAB设计进行了详尽的描述.实践表明,实验系统的开发和设计使学生能更好地理解和掌握该课程的基本理论,并能提高学生的工程应用能力.     

面向复杂数字系统的乘法器教学设计

分析和研究了面向复杂数字系统设计的乘法器教学设计问题。课程以二进制乘法为基础,强调乘法器原理在课程中核心地位,通过分析实例与计算过程,逐步过渡到有符号定点数乘法器设计;以复杂数字系统设计为应用目标,设计有限冲击响应滤波器设计实验;教学实践表明,乘法器教学改革有助于提高学生的核心竞争力,在新工科背景下,培养学生实践中解决问题的能力和创新精神。     

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.