基于Proteus的网上单片机实验室设计与开发

本文在分析《单片机原理与应用技术》课程教学目标与教学标准的基础上,根据实际教学需求,将电路仿真软件应用于单片机课程网上教学中,开发了基于Proteus软件的网上单片机实验环境,重点介绍其仿真环境的建立、实验项目的开发以及教学环节的设计。该实验室以学习者为中心,具有直观、灵活、开放和资源丰富等特点,为单片机远程实验教学提供了一个良好的解决途径,为培养学生的分析设计能力和单片机开发技能提供了一种新方法。     

基于Proteus的单片机仿真实验室构建

在电类专业教学中,单片机的实验室建设大多采用硬件仿真器配目标实验板方式,存在着一定的弊端:硬件设备采购量大,资金投入大;单片机技术更新快,实验仪器很快落后;设备维护工作量大;单片机实验箱由于是成品,学生很难参与到其中的细节设计中去,学生动手能力难得到训练与提高等.文章提出一种基于Proteus软件的单片机仿真实验室建设方案,大量的实验在软件环境中仿真实现,有效地解决资金和设备维护问题,增强了实验室向学生开放的便利性、时效性.     

“单片机原理”实验教学体系建设

本文针对＂单片机原理＂课程实验教学与实践能力培养方面存在的实验内容单一、验证性实验比重偏大、受时间、地点制约严重和缺乏系统指导等问题,结合单片机课程自身的特点,对＂单片机原理＂实验教学体系的建设进行了改革和探索。我们提出了＂传统实验平台＋网络虚拟实验平台＋便携式单片机开发实验平台＂相结合的单片机实验教学体系,并对实验课程体系、指导方法和实验实践教材等进行了探索。     

虚拟仿真技术在单片机实验中的应用

介绍了PROTEUS虚拟仿真实验技术的特点,以单片机定时器实验为例阐述了Proteus软件在单片机实验中的应用方法。将Proteus软件运用于单片机实验教学中,为单片机系统应用学习实践和开发提供了理想的平台,解决了高校资金投入与人才培养之间的矛盾。     

AT89S51单片机实验系统的开发与应用

针对传统单片机实验系统依赖于仿真器调试,实验成本高且效率低,不适应现代科技的开发要求的问题,为改善单片机实验系统的性能,采用在系统编程（ISP）的方法,利用AT89S51芯片设计了一种单片机实验系统。实验表明系统结构简单,实用性强,达到了工科类高职生快速掌握单片机的基础知识的预期效果。     

依托公共实验基地培养全日制专业硕士

本文依托研究生公共实验教学基地,以自动化领域高新技术工程应用与科技创新能力培养为抓手,探索应用复合型全日制专业硕士生的教育教学方法;对DSP、ARM、单片机、FPGA和PLC等自动化领域高新技术系列课程的课程体系与教学内容、教学模式与教学方法,以及公共实验基地的开放机制进行了深入改革,取得了良好效果。     

一种通用模块化单片机实验系统的设计

给出一种采用MCS-51／96系列单片机为核心的通用模块化单片机实验系统的硬件设计,该系统能在一块电路板上灵活地进行单片机系统与各种外部接口器件连接的实验,从而能有效锻炼学生的实验能力和动手能力,进而提高了《单片机原理及应用》课程的教学质量。     

核电磁脉冲对单片机系统的辐照效应研究

核电磁脉冲对单片机系统具有很强的干扰和破坏作用。为研究核电磁脉冲对单片机系统的各种效应，利用GTEM室产生的模拟核电磁脉冲，对单片机系统进行了辐照效应实验。实验表明，单片机系统在核电磁脉冲作用下，会出现“死机”、重启动、通讯出错、片内RAM和外部RAM内容改变以及数据采集误差增大等现象。在实验基础上，研究了单片机系统的各种效应产生的原因。     

单片机控制系统实时参数的保护

本文分析了单片机控制系统ＲＡＭ存储的实时参数受干扰的可能性，并针对８０９８单片机温、湿度控制系统设计了瞬间开放ＲＡＭ写允许、分布存储及自动纠错的ＲＡＭ参数保护方案。     

MPLAB IDEv8．20和APP001Ver．2开发板简介及使用经验点滴

MPLAB IDE是Microchip公司出品的PIC系列单片机集成开发环境,适用于PIC系列单片机应用开发,MPLAB IDEv8．20为现在较高级版本。APP001Ver．2实验板为Microchip公司为其18系列单片机配套生产的多功能实验板,支持PIC18系列单片机的多种功能模块。本文就MPLAB IDEv8．20和APP001Ver2实验板配合使用学习PIC18系列单片机中遇到的常见问题,给出一些经验和建议。     

Graphene‐Based Nanomaterials: Synthesis,Properties, and Optical and Optoelectronic Applications

Graphene, a two‐dimensional, single‐atom‐thick carbon crystal arranged in a honeycomb lattice, shows extraordinary electronic, mechanical, thermal, optical, and optoelectronic properties, and has great potential in next‐generation electronics, optics, and optoelectronics. Graphene and graphene‐based nanomaterials have witnessed a very fast development of both fundamental and practical aspects in optics and optoelectronics since 2008. In this Feature Article, the synthesis techniques and main electronic and optical properties of graphene‐based nanomaterials are introduced with a comprehensive view. Recent progress of graphene‐based nanomaterials in optical and optoelectronic applications is then reviewed, including transparent conductive electrodes, photodetectors and phototransistors, photovoltaics and light emitting devices, saturable absorbers for ultrafast lasers, and biological and photocatalytic applications. In the final section, perspectives are given and future challenges in optical and optoelectronic applications of graphene‐based nanomaterials are addressed.     

高速光纤综合通信网络平台研究

现代通信网络应能满足各种通信业务和通信容量日益发展的需求,实现话音、数据、视频、IP等业务的一体化综合交换和传输。在比较TDM、IP和ATM三种协议的基础上,提出"采用内置RPR和MPLS功能的MSTP平台"建设光纤综合通信网络平台的实现方法。MSTP采用SDH的数据帧结构,保持了SDH标准光接口、灵活分插低速信号、自愈环保护和功能强大的网管等优点,可对TDM、IP和ATM协议进行优化传输。     

Wireless IP and Its Challenges for the Heterogeneous Environment

The tremendous momentum toward building a mobile wireless Internet using the Internet Protocol (IP) has thrust many challenges upon the technology developers and the operators. These challenges encompass the 2.5G, 3G, and future solutions and standards. Some of the key issues deal with supporting IP traffic across different wireless and MAC protocols, end-to-end QoS and mobility, traffic engineering and scalability, protection/restoration, operations and management, authentication/privacy/security, billing, and content and context aware networking. This article addresses the drivers, the issues, and solutions (wherever possible) in the above areas, and concludes with a summarization of the challenges that lie ahead.     

卫星遥感温室气体的大气观测技术进展

全球、区域及城市的碳浓度、碳源汇信息是应对气候变化、达成双碳目标、完善国际谈判、支持治理政策制定与执行的重要依据。国际认可的“自上而下” 方法将卫星观测作为基础的通量计算技术, 是验证温室气体排放清单的重要手段。系统介绍了温室气体的卫星探测载荷原理、类别和发展, 以及反演、估算CO2、CH4 和N2O 的浓度和排放通量的方法, 还有探测缺失和误差存在的影响因素等; 分析了对卫星探测温室气体能力提高的迫切需求, 浓度反演和排放量估算精度不足, 以及N2O、氟化物等其他温室气体遥感研究缺乏、地基遥感验证能力薄弱等问题; 最后总结了我国温室气体卫星遥感技术的发展趋势, 主要是面向主被动高时空分辨率卫星的研制应用、高精度多尺度排放量估算(特别针对城市、小区域和点源尺度)、氟化物遥感评估等主题, 以加强对碳排放的量化观测, 并增强对碳循环的理解, 提高感知和应对气候变化的能力。     

卫星通信组呼业务MAC层研究

组呼通信在指挥调度中有着重要作用,而在一些地面没有基站的地方,就无法正常使用。卫星通信具有无视地形,通信范围广,不易受陆地灾害影响,易于建设等优点。把卫星通信和组呼通信结合在一起的卫星组呼通信技术兼顾两者的优点,能更好的发挥指挥调度这一作用。当前卫星组呼通信采用固定频率方式,组呼成员在一个频率下进行通信,这种方式实用性不好。本文研究的是移动卫星组呼,在GMR-1系统的基础上研究了卫星组呼通信中MAC层的功能,提出了MAC-Ready-Gcc、MAC-Dedicated-Gcc这两个为了支持组呼的状态,并针对在MAC层发生的PTT竞争提出了一种回退策略。     

机动6m抛物面天线车结构总体方案探讨

文章遵循策划、分解、综合及优化的总体方案研究思路,根据要求,提出了三个机动6 m抛物面天线车结构总体备选方案;针对系统结构组成,详细分析了天馈线、天线座、拖车以及系统标定等子系统所有可能的结构方案;最后综合权衡研究三个备选方案在技术、质量、成本、周期等多方面的优劣,选择了最佳结构总体方案,确保了所选方案具有合理性、可行性、经济性、先进性和科学性。实践证明,所选方案用户满意,实施效果良好。     

Alternative Schemes for Dynamic Secure VPN Deployment in UMTS

Three alternative schemes for secure Virtual Private Network (VPN) deployment over the Universal Mobile Telecommunication System (UMTS) are proposed and analyzed. The proposed schemes enable a mobile node to voluntarily establish an IPsec-based secure channel to a private network. The alternative schemes differ in the location where the IPsec functionality is placed within the UMTS network architecture (mobile node, access network, and UMTS network border), depending on the employed security model, and whether data in transit are ever in clear-text, or available to be tapped by outsiders. The provided levels of privacy in the deployed VPN schemes, as well as the employed authentication models are examined. An analysis in terms of cost, complexity, and performance overhead that each method imposes to the underlying network architecture, as well as to the mobile devices is presented. The level of system reliability and scalability in granting security services is presented. The VPN management, usability, and trusted relations, as well as their behavior when a mobile user moves are analyzed. The use of special applications that require access to encapsulated data traffic is explored. Finally, an overall comparison of the proposed schemes from the security and operation point of view summarizes their relative performance. Christos Xenakis received his B.Sc. degree in computer science in 1993 and his M.Sc. degree in telecommunication and computer networks in 1996, both from the Department of Informatics and Telecommunications, University of Athens, Greece. In 2004 he received his Ph.D. from the University of Athens (Department of Informatics and Telecommunications). From 1998–2000 was with the Greek telecoms system development firm Teletel S.A., where was involved in the design and development of advanced telecommunications subsystems for ISDN, ATM, GSM, and GPRS. Since 1996 he has been a member of the Communication Networks Laboratory of the University of Athens. He has participated in numerous projects realized in the context of EU Programs (ACTS, ESPRIT, IST). His research interests are in the field of mobile/wireless networks, security and distributed network management. He is the author of over 15 papers in the above areas. Lazaros Merakos received the Diploma in electrical and mechanical engineering from the National Technical University of Athens, Greece, in 1978, and the M.S. and Ph.D. degrees in electrical engineering from the State University of New York, Buffalo, in 1981 and 1984, respectively. From 1983 to 1986, he was on the faculty of Electrical Engineering and Computer Science at the University of Connecticut, Storrs. From 1986 to 1994 he was on the faculty of the Electrical and Computer Engineering Department at Northeastern University, Boston, MA. During the period 1993–1994 he served as Director of the Communications and Digital Processing Research Center at Northeastern University. During the summers of 1990 and 1991, he was a Visiting Scientist at the IBM T. J. Watson Research Center, Yorktown Heights, NY. In 1994, he joined the faculty of the University of Athens, Athens, Greece, where he is presently a Professor in the Department of Informatics and Telecommunications, and Director of the Communication Networks Laboratory (UoA-CNL) and the Networks Operations and Management Center. His research interests are in the design and performance analysis of broadband networks, and wireless/mobile communication systems and services. He has authored more than 150 papers in the above areas. Since 1995, he is leading the research activities of UoA-CNL in the area of mobile communications, in the framework of the Advanced Communication Technologies & Services (ACTS) and Information Society Technologies (IST) programmes funded by the European Union (projects RAINBOW, Magic WAND, WINE, MOBIVAS, POLOS, ANWIRE). He is chairman of the board of the Greek Universities Network, the Greek Schools Network, and member of the board of the Greek Research Network. In 1994, he received the Guanella Award for the Best Paper presented at the International Zurich Seminar on Mobile Communications.     

MATLAB在地理信息系统开发中的应用

GIS是计算机科学、地理学、测绘学、地图学等多门科学综合的技术,其核心是计算机科学,基本技术是数据库、地图可视化及空间分析。MATLAB是当前流行应用软件和编程语言,它集数学计算、可视化和编程于一体,易学易用。本文介绍了MATLAB软件的主要特点,阐述了MATLAB地图工具箱、数据库工具箱、用户图形界面及其与外部程序的接口等技术,并探讨了它们在地理信息系统开发中的应用。     

基于声卡的虚拟示波器设计

随着现代科学和信息技术的不断进步,示波器作为一种电子测量处理仪器也在不断发展并且已经变的越来越精密,也越来越智能.传统的模拟示波器受到低频响应能力和带宽限制等多方面因素影响在很多领域已显得力不从心,虚拟示波器的出现很好的解决了这些问题.本文以LabVIEW18版本为开发平台,设计制作了一款基于声卡的虚拟示波器.重点介绍...     

The effect of soldering process variables on the microstructure and mechanical properties of eutectic Sn-Ag/Cu solder joints

Fundamental understanding of the relationship among process, microstructure, and mechanical properties is essential to solder alloy design, soldering process development, and joint reliability prediction and optimization. This research focused on the process-structure-property relationship in eutectic Sn-Ag/Cu solder joints. As a Pb-free alternative, eutectic Sn-Ag solder offers enhanced mechanical properties, good wettability on Cu and Cu alloys, and the potential for a broader range of application compared to eutectic Sn-Pb solder. The relationship between soldering process parameters (soldering temperature, reflow time, and cooling rate) and joint microstructure was studied systemati-cally. Microhardness, tensile shear strength, and shear creep strength were measured and the relationship between the joint microstructures and mechani-cal properties was determined. Based on these results, low soldering tempera-tures, fast cooling rates, and short reflow times are suggested for producing joints with the best shear strength, ductility, and creep resistance.