摘要： The influence of the choice of the intramolecular potential on the resulting frequency shift of the fundamental vibrational transition in the dihydrogen molecule adsorbed on zeolite NaA is estimated. It is shown that an improved Morse potential and the potential calculated by Kolos and Wolniewicz lead to the same frequency shift value. Application of the Buckingham method for the frequency shift calculation to this case is discussed.

关键词： 移动计算网络   无线局域网   计算机网络  

摘要： 本文介绍移动计算网络的概念，讨论实现移动计算网络的各种途径。重点讨论由无线局域网实现移动计算网络的方法及主要技术问题，并介绍有关电波法规及标准化活动。

关键词： 移动计算   总经理   Khaw Kheng Joo   掌上型计算机   HP   掌上计算机   个人计算机   PC机  

摘要： 对于刚刚度过10周岁生日的中国惠普公司而言,1995年8月15～16日两天也是极不平凡的日子。这两天,HP公司,这个本世纪三十年代诞生于美国硅谷、被人誉为发展最稳定的高科技先驱将其数十年来在信息技术方面的成果集中展现于北京中国大饭店——举

关键词： mobile station   bandwidth management   Platform   Software maintenance   Mobile Computing   Distribute   mobile communication  

摘要： With the rapid development of mobile computer systems and mobile communication infrastructures, a broad field of distributed mobile computing is enabled. The paper first discusses these developments in closer detail and summarizes the resulting requirements concerning adequate software support. An application scenario of the service engineering area illustrates specific aspects including bandwidth and location management, dynamic configuration, resource heterogeneity, disconnection, and security. Based on these considerations, a generic software support platform for distributed mobile computing is derived. It addresses several of these aspects by providing application-independent and reusable support services. In particular, it offers a framework for organizing distributed mobile applications into manageable domains, it equips mobile stations with enhanced functionality for location, resource and bandwidth management, and it uses industry standard RPC communication facilities for enhanced portability. The design, implementation and use of the support platform is illustrated based on a specific part of the application, a mobile multimedia e-mail system. Experiences and implementation aspects in this context are particularly emphasized.

关键词： 群组软件   功能   所有   移动计算   邮件程序   GroupWise 4.1   最终用户   日程安排   窗体  

摘要： Novell的GroupWise 4.1称得上是一个非常好的产品。虽然Groupwise只是一个基于相当简单的电子邮件结构的产品,但从产品功能上讲GroupWise堪与LotusNotes匹敌。从产品命名来看,GroupWise容易使人混淆,直到最近,该产品还被称作WordPerfect Symmetry,在此之前名为WordPerfect Office。 幸运的是,GroupWise非常棒,足以使人们忘掉其混乱的发展历程。在GroupWise中集成了许多新的、具有革命性意义的客户机平台软件,增加了对SimpleMAPI的支持,提供了新的定制消息能力、Internet风格讨论论坛以及大量移动计算选项,所有这些功能使GroupWise足以超越其不凡的早期版本,成为一种工作组综合软件以及符合企业级应用的标准。

关键词： LAN   MAC   存取点   移动计算   无线数据网络   传输速度  

摘要： 十几年前,移动计算的第一个浪潮 开始汇成汹涌澎湃的力量,彻底 地改变了许多人的工作方式。现在,随着无线局域网(LAN)的到来,漫游大革命正在从路上向办公室扩散。这种技术之所以能变得实际可行,关键之一就是今年年底将定案的新的IEEE802.11无线数据标准。 早期的便携式计算机使臂力很大的旅行者有可能带着它上路,作为其办公室的随身部分使用于会议室、旅馆住房、航班就餐桌,偶尔还用于游泳池旁的休息处,从此开始了移动计算的时代。现在,第二个移动计算浪潮发生于

关键词： 移动计算机系统   计算机系统   无线通信  

摘要： 移动计算机系统王令朝（上海铁路局工业总公司上海２０００７１）当前，世界计算机领域出现一种计算机技术与无线通信技术相互结合的趋势。这是继膝上式、笔记本式、掌上式计算机之后又一个引人注目的发展新动向。正如８０年代迅速发展起来的移动电话系统一样，作为一个崭...

关键词： 数术记遗   《史记·五帝本纪》   移动计算   方之中   《将进酒》   《易·系辞》   我国古代   解注文   分成三份   三才  

摘要： 《数术记遗》中“珠算”浅析高建基《数术记遗》一书，为东汉徐岳撰，北周甄驾所注。自清代以来，有人认为此书系甄鸾伪托之作。近些年，我珠算史研究者，经过多方考证，认为此书是徐岳原著无疑。书中记述了我国古代民间较为流行的十三种计算工具，它对研究我国古代珠算史...

关键词： 多媒体时代   信息超高速公路   多媒体技术   交互式电视   移动计算   计算机电话   克林顿政府   多媒体信息服务   信息量   电视中心  

摘要： 最近,美国一家调查公司公布的调查结果表明,美国将比原先预计的提早10年,即1998年至2000年进入多媒体时代。提早的原因,一方面是由于多媒体技术本身的长足进步,另方面克林顿政府上台后提出的"信息超高速公路"设想,促使许多公司在这方面进行巨额投资,也是重要因素。什么是多媒体时代媒体是指信息的载体。

关键词： communication   digital radio systems   distributed processing   hand-held mobile computing   mobile computers   mobile computing   mobile radio systems   mobility   portability   portable computers   software   software designers   software engineering  

摘要： The technical challenges that mobile computing must surmount to achieve its potential are hardly trivial. Some of the challenges in designing software for mobile computing systems are quite different from those involved in the design of software for today's stationary networked systems. The authors focus on the issues pertinent to software designers without delving into the lower level details of the hardware realization of mobile computers. They look at some promising approaches under investigation and also consider their limitations. The many issues to be dealt with stem from three essential properties of mobile computing: communication, mobility, and portability. Of course, special-purpose systems may avoid some design pressures by doing without certain desirable properties. For instance portability would be less of a concern for mobile computers installed in the dashboards of cars than with hand-held mobile computers. However, the authors concentrate on the goal of large-scale, hand-held mobile computing as a way to reveal a wide assortment of issues