最新一代系统节电器的综合介绍——G4 Speed Uni Saver

本文较全面地介绍系统节电器，包括生产，趋势，污染后果，浪涌型式，性能，特点，原理，应用场合，参数，各代区别，第四代的优点，装置方式，功率确定，动能区别，系统框图，使用结论等。     

小型演播厅灯光,舞美的计算机辅助设计

小型电视台（站）由于人员，经费，设备，场地等限制，演播厅灯光，舞美因不同的演出和栏目需要，需经常调整或重新设计，布置，使用计算机进行辅助设计，可以在机上进行调整，修改，避免与实际操作发生时空交叉，冲突，影响演播厅的正常使用。     

价格战的博弈分析

企业之间竞争加剧，价格战时常发生，从将博弈的角度来分析，通过建立模型，最后可以得出唯一的纯策略纳什均衡解，即降价，当然，在竞争初期，通过价格战，竞争双方大大增加了用户从而提高市场占有率，但同时降低了ARPU，在注重利润的资本市场中，长期下去只会造成两败俱伤，然而，可以通过政府和市场相结合，对企业竞争行为进行规范，从而约束价格战。     

《量子电子学报》2006年（第23卷）总目次

.综述期页脉冲激光沉积法制备2 no基薄膜研究进展.…，.……，..................……，.，..…，董伟伟，陶汝华，方晓东1(l)晶格原子光学及其应用..…，....................................……，..................……浑星，印建平1(10)超强飞秒激光脉冲在空气中的传输研究(特约)...……张杰，郝作强，远晓辉，郑志远，张吉吉，俞进，鲁欣，奚婷婷，王兆华，仲佳勇，金展，刘运全，令维军，赵卫，魏志义3(282)纳米光子学综述...........……，......……，.............................................……，.余雷3(374)空芯光子晶…     

从大哥大到三哥三中国3G十年马拉松

近日，在全国信息产业工作会议上，信产部部长王旭东的讲话再次提到了对3G的看法，王旭东称，一，经过多年的努力，我国发展3G的条件已基本成熟；二，要继续做好TD-SCDMA规模网络技术应用试验，充分考虑电信网规模经济特点，遵循市场竞争规则，推动自主知识产权技术发展；三，优化市场竞争结构，优化网络资源配置；四，制订和完善相关的准入，业务，资费，监管，频率，建设管理等政策，确保3G发展平稳起步。 对此，知名电信专家，信产部通信科技委委员，北京邮电大学教授宋俊德提出了自己对中国3G的相关看法。[编者按]     

白衣秀士明基-西门子EF51

一袭白衫，不带一丝花哨，弹指之间，音乐信手拈来，将小喇叭塞入耳中，与喧闹的都市完全隔离，把思絮沉淀，再沉淀，直到波澜不惊，轻启唇齿，只需说出那个再熟悉不过的号码，让思念之人的话语在耳边响起，一切都那么轻松，那么简单。[编者按]     

激光治疗复发性口疮疗效观察

本文通过对３２例复发性口疮病人用氦氖激光治疗的观察与分析，由于光热效应改善了营养代谢，使炎性代谢产物排出，达到镇痛，消炎，消肿，粘膜上皮组织修复，上皮细胞再生的目的，从而加速了溃疡面的愈合。提出此方法具有操作简单，无副作用，无痛苦，疗程短，愈合快，病人易接受等优点，值得推广。     

碟报频传

机械公敌，刺激1995十周年(收藏版)，致命档案，证言，圣战风云，哈里波特3，金刚(1976)，幸福终点站，     

永唱新经济 挽手相伴行

新 经济，新经济……恰似乱花迷人眼，年青人 抱着一夜发财梦，有关人士对以电子信息技术为代表的高新技术，热得发烫的网络经济抱着过度的乐观，认为将永远是从增长走向增长。 天有不测风云，去春科技股开始下落，今年初决然崩溃，加上美国经济明显走缓，网络神话泡沫破灭，信息技术产业陷入低迷，微电子工业今年铁定下降等等，乱云翻滚，阴■沉沉。于是，对新经济怀疑者有之，反对者有之。 这几年，人们说了许许多多的新经济，媒体上刊载了许许多多的新经济文章，其实至今也没有规范出一个明确的定义，仁者见仁，智者见智。大致归结，多数…     

一种改善球形目标RAM优化速度的方法

采用遗传算法设计球形目标雷达吸波材料时，由于适应度函数是以级数形式给出，且随物体尺寸的增大，级数收敛减慢，优化时间成倍增长，为提高设计效率，依物体电尺寸的大小分段使用不同的方法进行优化设计，其次，采用浮点数编码，可以节省计算机内存，简化优化过程，从而大大缩短优化设计的时间，为避免算法陷入局部最优，采用分段变参数遗传算法，提高进化的效率，最后，用Matlab设计算法，通过算例证明方法的快捷、有效。     

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...     

法国军用电子信息技术发展研究

法国国防部于2007年6月公布《未来30年远景规划》,其中提出未来防务需要重点发展军用电子信息技术,尤其是微电子技术、光电子技术和电真空技术等基础技术,并把空间技术、信息通信技术、微纳米技术等高新技术纳入优先研究和发展领域。法国经过多年的自主研发和大型技术计划的成功推进,已具有完整独立的军用电子信息技术研制能力以及开发设施,其雷达、通信以及先进探测技术均位居世界先进水平。文中主要介绍了法国军用电子信息技术发展的现状、发展趋势和发展特点。