智能定时调功器的开发研究

提出一种智能调功器的硬件及软件实现方法。为了拓宽设备的应用范围，在吹件实现中编制了两种控制方式－－移相控制方式和通断控制方式。     

基于HDPLD的FIR滤波器设计

文章介绍了采用高密度可编程逻辑器件(HDPLD)对FIR滤波器进行设计的原理、技术和方法,并利用MAX+PLUSⅡ开发软件进行了仿真实现。     

低温生长GaAs实现半导体泵浦红外激光器被动调Q锁模研究

用低温生长GaAs红外晶体材料作为饱和吸收体兼输出镜，在二极管泵浦全固态激光器上实现了调Q锁模。激光器调Q运转阈值为2W。当注入泵浦功率为3．6W时，调Q锁模开始出现。当注入泵浦功率为8．4W时，平均输出功率达到837mW，调Q包络的重复频率为100kHz，锁模脉冲的重复频率为760MHz。     

处理机、微处理机、多机处理系统

0618588一种改进型PDM调功控制方式〔刊,中〕/熊磊//南昌大学学报(工科版).—2006,28(1).—99-102(G)提出了一种改进型PDM(Pulse Density Modulat-ed)调功控制方式,它能有效解决传统PDM调功控制方式所存在的电流波动大、呈有级调功、开关损耗较大等缺点。基于改进型PDM调功控制方式的逆变器工作于准谐振状态,可以自动跟踪负载频率变化,提高功率因数。利用DSP的快速处理能力对此控制方式进行数字化实现,能较好地增强了系统的抗干扰性和稳定性。参60618589基于DSP构建综合仿真平台的OFDM系统实现〔刊,中〕/姜沫岐//信息安全与通信…     

利用时空变换获得超短激光脉冲

由LD抽运Nd-YLF固体激光器输出的单纵模调Q激光脉冲，脉宽约为85ns，经过快速LiNbO3电光偏转器实现时空变换，用狭缝削取脉宽约为1ns的超短激光脉冲。导出激光束通过偏转器后扫描光线长度与加到偏转器上的快速电压脉冲变化率关系，并在实验中分别用MOS管和雪崩管高压电脉冲发生器取代价格昂贵的冷阴极管高压电脉冲发生器，获得激光脉冲宽度压缩约两个量级，且实现激光脉冲宽度可调。     

触摸式电火锅无级调功插座

<正> 用触摸式调光电路SL7232制作的触摸式电火锅调功插座,可对电火锅实现无级调功,随时都可将电火锅调至你所需要的温度,同时,也从根本上消除了机械旋钮因触点磨损、烧熔、或接触不良等造成的各种故障,使电火锅使用起来更方便、可靠、耐用。 这种无级调功插座电路如图1所示。为制作方便,可直接采用SL7232调光电路成品板改制。因电火锅的功率一般都在2kW左右,而调光电路中的电流较小,其所用可控硅不能用于电火锅的控制,因此需用一只12～16A、600V的     

臭氧发生器多频逆变电源中的PDM控制策略

简要分析DBD型臭氧发生器逆变电源的工作原理,在对PDM调功原理与实现方法的分析的基础上,针对其调功方式的优点和缺点,提出了一种PDM和PWM的混合调功策略.通过对拓扑结构功率输出单元工作过程和功率输出周期工作过程的分析,得到了多频臭氧发生电源的功率调节规则,并通过仿真对其进行了验证.     

1ns脉宽延迟可调码型发生器在低速时钟下的实现方案

利用Altera公司高端FPGA芯片Stratix II FPGA的内嵌式增强型锁相环的特性，在采用较低速率时钟的情况下，通过配置锁相环参数，实现了高速率、占空比和延迟均可调的码型发生器，精度可达1nS．文中给出该算法的实现方案，并对其实现误差进行了讨论．最后用EP2S30F484C5芯片对该算法进行了实现，取得了预期的效果．     

上海光源硬X射线微聚焦光束线站首轮调试暨首台真空波荡器自主研制获得成功

硬X射线微聚焦及应用光束线站（BL15U1）是上海光源工程首批光束线站中．第一条进行调试的真空波荡器光束线站。2月6日下午．科研人员完成了调束前准备工作，晚18：00开始正式调束，随即在光束线荧光靶和丝扫描探测器上分别观测到波荡器辐射光斑和光电流，21：30分在实验站铍窗出口处的电离室上探测到波荡器辐射的5．4keY单色光（3次谐波），并扫描获得该能量下单色器摇摆曲线，实现了首轮调束目标。     

带监视器DS1270型场强仪

该产品是新—代接收机，它实现了全自动、扫频测量。用命令指挥本地振荡器改变频率，指挥预选器实现调谐，被测信号经过多次混频变为中频信号，经加权检波器变成直流信号，模拟数字变换器将模拟信号变成数字信号，电脑对此信号进行分析判断，再发出相适应的命令指挥衰减器和校准器等部件，进行校正和测量。     

舰载雷达及电子对抗装备性能测试评估系统的设计与实现

利用软硬件结合方式,设计一种针对舰艇雷达及电子对抗装备主要性能的测试及评估系统,实现非接触测试,无须上舰,在距离舰艇100~200 m的码头,采用"定量比对法"对雷达及对抗装备的关键参数进行测试和评估。     

3G接入技术中认证鉴权的安全性研究

对3G用户接入时的认证鉴权进行分析和研究，介绍了3G的安全体系结构，详细分析了3G的认证和鉴权机制和过程、用户信息的加密和完整性保护的过程和方法、密钥协商机制，并指出了3G认证鉴权机制可能存在的缺陷，最后对2G和3G的互通方面的安全性和2G与3G安全上下文之间转换运算的算法进行了分类和剖析。     

All-Learning: The state of the art of the models and the methodologies educational with ICT

This paper presents a systematic review of models and methodologies that integrate information and communication technologies (ICT) and education. The systematic review was based on the methodology of Kitchenham. The steps used and developed correspond to the steps proposed in the methodology. The starting point of the review are the research questions, then keywords, selection of the databases, definition of the inclusion and exclusion criteria, the definition of the search chains, search process and selection of papers, the analyzes of the paper and the results of the systematic review to answer the questions posed. In the systematic review, 919 papers were found in 6 academic databases and 129 relevant papers were selected. The work developed intends to know the different models and methodologies that integrate the ICT and the education. Develop an analysis and characterize to find common elements among models and methodologies. The idea is to find limitations, disadvantages and spaces that allow to propose a new model. This systematic review is the first step in the development of a doctoral research in which the development of a U-Learning model based on Connective Learning and Experience Learning is proposed.     

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.     

小信号多腔速调管主要性能指标简化分析

介绍了速调管在我国的发展现状和小信号条件下速调管的各种主要性能指标的简化分析方法。在这种简化分析方法中,首先不考虑非线性和相对论效应等带来的影响,并把多腔速调管看作是几个双腔速调管的级联,得出了增益、效率、带宽和输出功率等重要参数的计算公式。然后通过给出部分参数的修正系数说明了这种简化分析方法的实用价值及理论指导意义。     

基于S3C2440的智能模拟人的控制

以S3C2440为平台,实现了S3C2440单板机对智能模拟人的控制箱,按压和通气功能的控制,以及S3C2440与上位机通信功能,通过对内核的裁剪和驱动及控制程序的编写,不仅可以实现各种控制箱的操作,而且也可以对模拟人的按压和通气模拟操作功能进行控制,产生与之对应的各种模拟反应。最后,提出了用设置加权系数的办法解决按压和通气控制条反应速率过缓问题。     

GPS 接收机交调互调敏感度测试方法研究

GPS 卫星定位技术已广泛应用于航空航天系统。本文通过阐述GPS 接收机的工作原理及GPS 信号的特点,分 析了接收机交调互调传导敏感度测量原理,扩展了GPS 接收机交调互调传导敏感度的试验方法。该测试方法快捷、易 于掌握,便于得到接收机互调交调抑制比参数。     

直流电源输出的纹波和噪声的测量

对于直流电源纹波和噪声的测量,不同的测量方法测量的结果往往差别较大。针对这个问题,本文先介绍了电源输出的纹波和噪声的基本概念,并在此基础上介绍了三种常见的纹波和噪声的测量方法：直接测量的方法、去掉探头和探头接地线的测量方法和使用同轴电缆的测量方法。通过分析、比较,阐明了不同测量方法之间的区别,明确了对示波器的要求及测量的注意事项,以使大家能够根据具体情况选用适宜、方便的测量方法,准确地测量到直流电源输出的纹波和噪声。     

Designing an Embedded Video Processing Camera Using a 16-bit Microprocessor for a Surveillance System

This paper describes the design and implementation of a hybrid intelligent surveillance system that consists of an embedded system and a personal computer (PC)-based system. The embedded system performs some of the image processing tasks and sends the processed data to the PC. The PC tracks persons and recognizes two-person interactions by using a grayscale side view image sequence captured by a stationary camera. Based on our previous research, we explored the optimum division of tasks between the embedded system and the PC, simulated the embedded system using dataflow models in Ptolemy, and prototyped the embedded system in real-time hardware and software using a 16-bit CISC microprocessor. This embedded system processes one 320 × 240 frame in 89 ms, which yields one-third of the rate of 30 Hz video system. In addition, the real-time embedded system prototype uses 5.7 K bytes of program memory, 854 K bytes of internal data memory and 2 M bytes external DRAM. Koichi Sato is a Ph.D. student in the Department of Electrical and Computer Engineering at The University of Texas at Austin. He earned his B.S. in University of Tokyo, Japan in 1993. He worked for Automotive Development Center in Mitsubishi Electric Corporation where he was involved in lane and automobile recognition in vehicle video processing products such as automatic cruise control and drowsiness detection systems. He enrolled in the current University at 1998 and received an M.S in 2000. In his Master's thesis he worked on human tracking and human interaction recognition. His current work includes velocity extraction using the TSV transform, object tracking, and 3D object reconstruction. Brian L. Evans is a tenured Associate Professor in the Department of Electrical and Computer Engineering at The University of Texas at Austin. His research and teaching efforts are in embedded real-time signal and image processing systems. In signal processing, his research group is focused on the design and real-time software implementation of ADSL and VDSL transceivers, for high-speed Internet access. In image processing, his group is focused on the design and real-time software implementation of high-quality halftoning for desktop printers, smart image acquisition for digital still cameras, and 3-D sonar imaging systems. In signal and image processing, Dr. Evans has published over 100 refereed conference and journal papers. Dr. Evans is the primary architect of the Signals and Systems Pack for Mathematica, which has been on the market since October 1995. He was a key contributor to UC Berkeley's Ptolemy Classic electronic design automation environment for embedded systems, which has been successfully commercialized by Agilent and Cadence. His BSEECS (1987) degree is from the Rose-Hulman Institute of Technology, and his MSEE (1988) and PhDEE (1993) degrees are from the Georgia Institute of Technology. From 1993 to 1996, he was a post-doctoral researcher in the Ptolemy project at UC Berkeley. He is a member of the Design and Implementation of Signal Processing Systems Technical Committee of the IEEE Signal Processing Society, and a Senior Member of the IEEE. He is the recipient of a 1997 National Science Foundation CAREER Award. J.K. Aggarwal has served on the faculty of The University of Texas at Austin College of Engineering since 1964 and is currently Cullen Professor of Electrical and Computer Engineering and Director of the Computer and Vision Research Center. His research interests include computer vision and pattern recognition focusing on human motion. A Fellow of IEEE since 1976 and IAPR since 1998, he received the Senior Research Award of the American Society of Engineering Education in 1992, the 1996 Technical Achievement Award of the IEEE Computer Society and the graduate teaching award at The University of Texas at Austin in 1992. He has served as Chairman of the IEEE Computer Society Technical Committee on Pattern Analysis and Machine Intelligence (1987--1989); Director of the NATO Advanced Research Workshop on Multisensor Fusion for Computer Vision, Grenoble, France (1989); Chairman of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition (1993), and President of the International Association for Pattern Recognition (1992--1994). He is a Life Fellow of IEEE and Golden Core member of IEEE Computer Society. He has authored and edited a number of books, chapters, proceedings of conferences, and papers.     

胆小管超微细胞酶学研究

以电镜细胞化学的方法,观察了小鼠胆小管酶的分布。观察的12种酶中,NDPase和G6Pase三种酶分布于胆小管微绒毛;AlPase、Na~+-K~+ATPase、Mg~(++)-ATPase、Ca~(++)-ATPase、CMPase、ACase和5＇-Nase等7种酶分布于胆小管微绒毛,也分布于肝细胞邻接面细胞膜和Disse间隙微绒毛;ACPase、细胞色素氧化酶以及线粒体ATPase不分布胆小管微绒毛,也不分布Disse间隙微绒毛和肝细胞膜。据信,胆小管微绒毛上的酶参与胆汁成份的转运,提供转运所需能量以及还可能与某些代谢过程有关。本实验中磷酸水解酶类使用的铈基法及亚铁氰化钾半还原的锇酸后固定法,效果优于铅法。