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随着宏观调控措施的密集出台,节能减排任务已是迫在眉睫,而纺织行业特别是印染行业作为节能减排的重点领域,更是面临着新一轮调结构、转方式的压力。按照管住增量、调整存量、上大压小、扶优汰劣的指导思路,许 相似文献
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热压合技术改进的再探讨 总被引:2,自引:0,他引:2
《设备维修》杂志1982年第2期刊登王秩信译自日本《设备工程师》杂志的“热压合技术的改进”一文,应用应变能学说的等效应力y小于或等于材料屈服强度σs,配合部位的强度是安全的。译文中的过盈量比x =δd×10 3 。本人对x的取值问题曾有“热压合过盈的简化计算”一文(见〈设备管理与维修〉杂志1999 10期)作过探讨。今再作探讨如下。1 当y <σs 时 在y的最小值没有制约条件时,很容易达到y <σs,但浪费材料。若是过盈量比采用x =δd ×10 3 =3m4+12m2 ×σsE ×10 3 =3m4+14 2 0m2 σs,则y =Eδ3m4+12dm2 =3m4+14m4σs,也就是说不管包容件的… 相似文献
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朱彦龙 《石油化工技术经济》2005,21(3):52-56
化工行业是我国的支柱行业,化工领域技术研发有其特殊性和复杂性,文章对化工领域的技术研发以及转移过程中存在的难点进行了分析,并提出了对策建议。 相似文献
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从目前情况看,全球的包装机械需求预计将以每年5.3%的速度增长,到2005年达290亿美元。美国拥有最大的包装设备生产商,其次是日本,其他主要生产商还包括德国、意大利和中国。但到2005年,包装设备生产增长最快的是在发展中的国家和地区。发达国家将从刺激国内需求中获利,并在发展中国家寻找当地合适的生产厂家,特 相似文献
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George L. Peterson 《工程经济学家》2013,58(4):17-31
A general discussion of the undergraduate course in Engineering Economy is presented for comment and evaluation. The discussion is aimed at unification and cohesion of engineering decision methods by means of a basic structure of applied decision theory centered in a simplifying abstraction of teleological behavior. The traditional course covers concepts and methods that are useful to the improvement of the efficiency with which engineering decisions are made, but textbooks lack organization, cohesion, and rigor. Suggested elements of the unifying structure are (1) the formulation of specific objectives from value potential, (2) the measurement of value, (3) the specification of available choices, (4) the prediction of outcomes, (5) the estimation of criterion functions, and (6) optimization processes. Engineering Economy is traditionally taught as a bagful of disorganized tools. As a student of Civil Engineering the author went through it twice, once as an undergraduate and once as a graduate (at different institutions and from very able professors) without grasping the basic concepts that should have been learned. Many methods, definitions, and problems were well embedded in the gray matter, but the collection resembled a child's tool box where things are packed carelessly without regard for saw teeth, plane and chisel blades, or probing fingers. There is little orderly arrangement that might make the tools more easily found and more effectively used. More recently the author has been faced with the task of teaching the course to senior engineering students. In the meantime, between second and third rounds, two graduate degrees were acquired, and a lot of time was spent studying operations research and economics. It is, perhaps, needless to say that the bag of tools has gained a startingly new significance. Everything has begun to slip neatly into a basic framework, and this produces a large question mark. Why are the textbooks on the subject written so as to obscure the unifying principles that are so basic to decision processes and all goal-oriented behavior? In the author’s opinion, the objective of the course is simply to study the improvement of the efficiency of teleological or goal-seeking behavior in the engineering context. There is room for vast improvement. The following discussion is a recommended step in that direction. 相似文献
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大庆石化公司腈纶厂自投产以来先后更新过三种型号国产毛球打包机。对三种打包机性能进行了比较,三种打包机各有优缺点;打包机革新趋势是:劳动强度越来越小。 相似文献
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根据水头函数二阶导数的特性,对有压渐变管段的总水头和测压管水头线的沿程变化情况进行定性分析,同时也通过实例计算进行定量分析。 相似文献
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经国家多次规划和开发,我国形成了十二大水电基地,其中有十大水电基地在中西部地区.充分开发和利用中西部地区的水电资源,有利于全国的电力结构的调整和优化,中西部地区的电能大体通过北、中、南三条主要通道和东部电网联结,实现中西部电能与东部技术经济资源的区位互补,优化电能资源配置.西部地区水电开发对西部地区的经济发展有较强的拉动作用,对增加财政税收和就业,对相关的产业发展,对库区的脱贫和经济发展都有促进作用.西部水电资源开发必须与可持续发展战略相结合,保护生态环境,实行开发性移民,充分利用水库的航运、交通、水产养殖、旅游等自然条件,并注重水电站的防洪作用. 相似文献
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到1999年底,柳州供电局已建设综合自动化变电站9座,即220 kV月山变,110 kV的箭盘变、马鞍变、三中变、基隆变、鹿山变、八一变、新风变、鸡喇变."四遥”变电站1座,即110 kV的河北变.根据城市电网改造的规划,市区新建设的110 kV、220 kV变电站全部按无人值班变电站设计、建设和验收.目前我局无人值班变电站的管理模式是在变电运行工区设置巡检班,配备必要的交通工具、通讯工具,由传统的变电站固定值班变为流动值班.在没有大规模建成无人值班变电站时,对无人值班变电站的远方监视、控制等由地调值班员负责.这6座无人值班变电站的变电运行管理人员,目前仅为14人. 相似文献