建筑集成化微机辅助设计系统

一、概述 Hi-CAD是一个集建筑、结构、设备、电气和经济五个专业为一体的综合性集成化软件,其框图如下: Hi-CAD根据建筑工程设计的特点,构筑了一个以建筑专业为龙头的带几何信息和非几何属性的建筑核心数据库,并通过信息传送与各专业建立联系,避免了单专业CAD软件大量数据的重复输入,并确保各专业之间的一致性,以克服软件离散的弊病。     

平凡人的网络故事

自1994年4月20日中国与国际互联网实现了全功能连接，成为国际互联网大家庭的第77个成员以来，中国的互联网络至今已经发展了整整10年。这10年来，中国网络潮起潮落，逐渐普及。这10年来，我们的目光一直为灿若星辰的知识英雄们所吸引，从张树新到丁磊，从马化腾到鲍岳桥，各路才俊的沉浮起落，一直让我们唏嘘不已的话题。     

如何在PowerPoint2000中使用FLASH？

在PowerPoint中整合Flash动画或互动效果可以增加其表现力和影响。本文所述方法在Office 2000的PowerPoint中通过，对其早期版本而言，此方法须在某些步骤上加以改动。     

燃煤电站锅炉排烟中潜热的回收

提高燃烧效率和(或者)从排烟中回收余热都能够改善锅炉效率。目前的研究是确定同时回收潜热和显热时热和烟的收益比率。通过在一个350MW热电站中的一台交叉流管状换热器传热和传质的数学模拟,获得了理论结果。这一结果表明,在烟气温度为150℃时,由于从排烟中回收潜热,锅炉效率可以提高5—6％。对换热器表面的最大腐蚀率做了予测。     

曲轴扭转振动和发动机噪声的关系(译文)

概述 本文介绍了日本ISUZU内燃机有限公司对一台已进行声学处理的柴油机幅射噪声机理的实验结果。与按常规设计的柴油机相比,这台发动机的总噪声级虽已相当低,因为通过对发动机结构的改进,使在人听觉的重要范围800～1250Hz内的噪声降低到令人满意的程度。但现在,主要的噪声峰值出现在1/3倍频程315Hz及1600Hz处,这两个峰对总噪声级     

家具与设计的关联

我们可以说人类文化是由生活 中经设计过的器材所构成的。现今的生活型态是由过去传承下来的,也将是未来的借鉴。人类过去生活型态中定期性的改变和发展,显示 了定期性的社会因素。这些因素影响到我们日常生活中各种器材设备 的设计形式。换句话说,这些因原始美感和材料、科技进步而设计出的定期性、地域性产品,成为设计美学 的总体概念。     

网吧品牌机导购指南

中国人口众多、经济生活不够富裕。约有70％左右人群由于无法在家上网，而选择去网吧。在此需求下。网吧成为一个新的投资产业。而网吧PC的购买则是业主比较关心的问题。根据市场现象得知，由于PC厂商的积极努力。以及政府关于网吧PC的严格规定。品牌PC已经成为网吧业主采购的主要对象。[编者按]     

PHASE INTERFACE SEGREGATION OF Mg IN A Ni-BASE SUPERALLOY IN100

The segregation of Mg to phase interfaces in a nickel base superalloy IN 100 has been investi-gated using EPT(Electron Microprobe Technique).AES(Auger Electron Spectroscopy)and EDS analyses on thin TEM film.The results show that Mg segregates to the phase inter-faces of MC/γ and γ′/γ.The segregation concentration and layer thickness of Mg onMC/γ phase interface are larger than that on γ′/γ phase interface.Mg is not only a grainboundary segregation element,but also a phase interface segregation one.     

IN-SITU OBSERVATION OF CRACK TIP DEFORMATION IN A DUPLEX STAINLESS STEEL

The development of dislocation structures in the plastic zone ahead of a crack tip has been in-vestigated in a duplex stainless steel during in-situ deformation experiments in a scanningtransmission electron microscope.It was found that the dislocation distribution wassignificantly different in the ferrite and in the austenite.In the ferrite grains,the dislocationsemitted by the crack tip may cross-slip out of the original slip planes and form a broad plasticzone.However,in the austenite,the dislocation free zone is small and the dislocations emittedby the crack pile up in its slip plane.The selection of slip systems at the crack tip depends onthe crack tip Schmid factors in both phases.But after large deformation,the selection of thesecond slip systems at the craek tip in austenite does not depend on the Schmid factors.     

LOCALIZED CORROSION OF MICROCRYSTALS OF 1Crl8Ni9Ti STAINLESS STEEL

The resistances against localized corrosion of 1Cr18Ni9Ti microcrystals with normal grainsize and bcc structure obtained hy magnetron sputtering have been compared.The two kindsof microcrystals with (110) and (211) textures respectively were obtained under differentsputtering conditions.Both microcrystals were found to have better resistance against local-ized corrosion than the crystal with normal grain.The microcrystal with (110) preferredorientation has larger resistance to localized corrosion than that with (211) preferredorientation.