Effect of the amount of zinc-doped on the electrochemical performance of nickel hydroxide     

YU Danmei  ZHOU Shangqi  CHEN Changguo  WEN Li  WANG Huaqing College of Chemistry  Chemical Engineering  Chongqing University  Chongqing  P.R. China College of Material Science  Engineering  Chongqing University  Chongqing  P.R. Chin 《重庆大学学报(英文版)》2004,3(1):74-77

1.IntroductionInrecentyears,theNi-MHbattery,akindofnewtypesecondarybatterydevelopedonthebaseofrechargeableNi-Cdbattery,hasattractedtheattentionofmostcustomersintheworldduetotheirexcellentperformancessuchashighpowerdensity,verygoodcyclability,highspecificcapacityandlessenviron-mentalimpact.Currently,theNi-MHbatteryiswidelyusedasapowerforportableelectricdevices,electricvehicles,portablevideos,andsomeimportantsmallapplications[1-3].Nickelhydroxideiscommonlyusedastheactivematerialfornickelposit…  相似文献   

查询方体——评价用户数据库查询效率的框架结构     

Hock C.Chan  BERnard C.Y.Tan  Kwok—kee Wri  王玮 《中国教育信息化》1995,(2)

影响用户数据库信息查询效率的三个关键因素是查询描述的现实性、表达的简易性及任务的复杂性。描述的现实性是指构造查询时的数据抽象程度;表达的简易性指查询语言的自由度;任务的复杂性是指查询的困难程度。这几个因素构成了一个三维的查询方体。我们进行了一些实验用于估计和评价在查询方体的不同顶点上用户进行数据库信息查询的效率。结果表明,查询方体这一概念是一个评估用户效率的可行框架。  相似文献   

Multiobjective optimization and multivariable control of the beer fermentation process with the use of evolutionary algorithms     

ANDRS-TORO B.  GIRN-SIERRA J.M.  FERNNDEZ-BLANCO P.  LPEZ-OROZCO J.A.  BESADA-PORTAS E. 《Journal of Zhejiang University. Science. B》2004,(4)

INTRODUCTIONThefermentationprocesshasgreatscientificandpracticalimportance.Forseveralreasons,qua-litycontrol,forexample,itisimportanttoincludeallkindsoftechnologicaladvancesintheindustrialprocesses.Thisisthemainaimofourresearch,whichisverycomplexduetothenon-linearityofthestudiedphenomena.Themathematicalmodelsfoundinliteratureincludeonlylaboratoyconditions.Amathematicalmodelhasbeendevelopedforthebeerfermentationprocessbecauseoftheadvantagesthatitprovides.Itallowssimulatingwhatcanhappenwhe…  相似文献   

开放灵活的分布式学习环境     

Badrul H.Khan  张建伟 《现代教育技术》2003,13(4):11-17

为了帮助设计者创建开放、灵活的分布式E-Learning环境,该文提出了一个E-Learning框架模型,从八个维度列出了E-Learning设计中需要考虑的关键问题:机构,教学,技术,界面设计,评价,管理,资源支持,伦理。  相似文献   

浅谈计算机应用基础网络课程栏目构建     

斯坎达尔.买提尼亚孜 《乌鲁木齐成人教育学院学报》2005,13(3):77-79,86

本文从网络课程要借助互联网的四大优势实现教学全过程的角度出发,介绍了笔者制作的计算机应用基础网络课程的栏目构建。  相似文献   

Adaptive progressive download based on the MPEG-4 file format   总被引：1，自引：0，他引：1  

FRBER Nikolaus  DHLA Stefan  ISSING Jochen Multimedia Transport  Dept. Audio  Fraunhofer Institute for Integrated Circuits IIS  Erlangen  Germany 《浙江大学学报(A卷英文版)》2006,7(Z1)

In this paper we describe how progressive download and adaptive streaming can be combined into a simple and efficient streaming framework. Based on the MPEG-4 file format (MP4) we use HTTP for transport and argue that these two components are sufficient for specifying an open streaming architecture. The client selects appropriate chunks from the MP4 file to be transferred based on (1) the header information (i.e. the "moov" box) in the first part of the file and (2) his observation of network throughput. The framework is completely client driven which allows for better server scalability and reduces signalling overhead. We discuss architecture and implementation issues such as complexity, interoperability and scalability and compare to 3GPP PSS Re1-6 adaptive streaming when appropriate. Measurements from a simple MP4/HTTP streaming client are presented showing that appropriate chunks are selected such that increased reliability is achieved.  相似文献   

明星与政治     

Kevin F. Sherry 《海外英语》2003,(9):7

Bono vs.Pretty Much Eyerything博诺vs .几乎每件事Bono befriends O’Neill and Ghana President JohnKufuor. His Case:You name it,he’s trying to fix it:hunger,education,health care,orphans,whatever makes peopleunhappy;lately,he's pushing debt relief for the ThirdWorld nations and stopping the spread of AIDS in Africa.  相似文献   

希望与安慰     

A．J．McKenna  洪馥芝 《英语辅导》2006,(9)

查理去医院探望他太太。“你觉得怎样?”他坐在床边,问道。身旁的多莉微笑地看着他,一头黑发铺在白色的枕头上。“我很好。”多莉平静地说。在查理看来,她显得苍老无力;脸色如死一般的苍白,眼睛下面垂着黑色的眼袋。“你好像很累,”查理说。“没有睡觉吗?”“昨晚我有点睡不着。”多莉没有提到她的病痛——她不想让丈夫担心。  相似文献   

习惯如何形成     

м.и.станкин  陈一新 《职教译丛》2002,(4):31-36

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1919-1922年土耳其人民的民族解放斗争     

A.M.沙姆苏特基洛夫  艾周昌 《历史教学问题》1957,(4)

土耳其是在伟大的十月社会主义革命的影响之下,首先掀起民族解放运动的国家之一.十月革命中诞生的苏维埃国家,引起了土耳其人民群众的深刻同情.苏联政府放弃了对土耳其领土的一切侵害,放弃了沙皇政府在不平等条约(特权条约制度)的基础上所获得的损害土耳其人民利益的经济和法律的权益.苏联政府公布了沙皇俄国同英、法、意关于瓜分土耳其的密约,揭穿了协约国的侵略计划.  相似文献