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。     

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     

logy, Fujian Agricul

2Many Cucurbitaceae plants were known to be Chinese medicine herbs and contain ribosome-inactivating proteins (RIP), a group of toxic proteins that have been proposed and demonstrated to play potential use as toxins in the therapy of a variety of human tumors and viruses inc     

China to Ban Unlicensed Production of Cakes and Moon Cakes Next Year

On August 29th, Pu Changcheng, Deputy Director of AQSIQ, addressing a national press conference on cake and moon cake quality safety market access, reported that as of the end of July 2007, 761cake and moon cake enterprises had gained market access qualifications and had obtained food production licenses.     

AQSIQ Sends Working Groups to Implement the Spirit of National Quality Working Conference

On August 1st, the General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ) convened a conference to transmit the spirit of national quality work and study an important speech regarding standards from Wen Jiabao,Premier of the State Council.     

Implement Obligations Seriously, Enjoy Rights Fully Make Active Countermeasure to the Barrier of Foreign Technology Trade

December 11th, 2006 is the fifth anniversary of China's entry into WTO. Over the past five years, what AQSIQ has done in implementing the obligations and enjoying the rights as a member of WTO? How's the performance? Facing with the current complicated barrier of technology trade worldwide, how will China reply to it? For these questions, reporters have made a special interview with Li Changjiang, Minister of AQSIQ.     

强度级别X70大直径钢管用厚板钢材的生产

亚速钢公司生产名牌品种和尺寸品种众多的K52到K60强度级别大直径天然气输送管用厚板钢材，供给乌克兰和俄罗斯企业一哈尔崔兹斯克钢管厂、维克苏钢铁厂、伏尔加钢管厂和其它厂，而同时强度级别从X42到X70，主要提供给国外远方的用户一印度、墨西哥、土耳其、东南亚。     

高跨导常断GaN MODFET

成功地制作出常断ＧａＮ基ＭＯＤＦＥＴ（调制掺杂ＦＥＴ）。该器件的栅长和沟道长度分别为３和５μｍ，其非本征跨导高达１２０ｍＳ／ｍｍ，在正栅偏压为３Ｖ时其电流为３００ｍＡ／ｍｍ。该跨导值与先前报道的栅长分别为１和０．２３μｍ、跨导分别为４５和２４ｍＳ／ｍｍ的器件相比，是相当不错的。     

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。