大长径比12缸发动机凸轮轴中频淬火研究

对大长径比12缸发动机凸轮轴中频淬火感应器和淬火介质进行研究,采用文中设计的淬火感应器和选择的淬火介质,产品性能指标符合主机配套的技术要求。     

曲轴淬火机床三轴联动的程序实现

一台采用三菱C64CNC系统的8伺服轴曲轴淬火机床,其中X轴为感应器工作台水平移动轴,Y轴为工件旋转轴,其余6轴分别控制3个感应器前后和上下运动,感应器由摆杆悬挂系统控制.机床工作过程:①加热前,感应器下降紧密接触工件.②加热中,工件旋转,感应器随工件自由运动.③加热后,工件停止旋转,感应器上升.     

YX130-300-600型金属瓦楞板自动成形机的工艺设计

介绍了“YX1 30 -30 0 -6 0 0型金属瓦楞板”自动成形机的成形工艺设计和自动循环工艺过程设计。     

煤炭价格

20 0 4年 2、 3月份秦皇岛煤炭价格 单位 :元 /t日 期价 格煤种2月 18日 2月 2 5日 3月 3日 3月 10日大同优混( 2 5MJ/kg以上 )火车车板价 2 6 830 0 2 6 830 0 2 6 830 0 2 6 830 0港口场地价 2 74 30 0 2 74 30 0 2 74 30 0 2 74 30 0平仓价参考价 2 90 32 0 2 90 32 0 2 90 330 2 90 330最低价 - - - -山西优混( 2 3MJ/kg以上 )火车车板价 2 6 0 2 90 2 6 0 2 90 2 6 0 2 90 2 6 0 2 90港口场地价 2 6 42 90 2 6 42 90 2 6 42 90 2 6 42 90平仓价参考价 2 80 310 2 80 310 2 80 3152 80 315最低价 2 7530 0 2 7530 0 2 7530 52 7530 5…     

内蒙古海华露天煤矿采区过渡方式的选择

内蒙古海华露天煤矿生产规模0．90Mt／a,该矿前期为露天开采,后期为井工开采。露天开采设计采用单斗挖掘机-自卸汽车-推土机间断式开采工艺,当前如何选择合理的采区过渡方式,保证过渡期间该矿产销均衡发展,是一个关键性的问题。论文通过不同过渡方式的比较,论证了留沟缓帮过渡方式的优越性和可行性。     

2004年1、2月份秦皇岛煤炭价格

日 期价 格煤种1月 1 7日 1月 1 4日 2月 4日 2月 1 1日大同优混(2 5MJ/kg以上 )火车车板价 2 682 90 2 682 90 2 6830 0 2 6830 0港口场地价 2 742 95 2 742 95 2 7430 5 2 7430 0平仓价参考价 2 90 330 2 90 330 2 90 330 2 90 32 0最低价 - - - -山西优混(2 3MJ/kg以上 )火车车板价 2 60 2 80 2 60 2 80 2 60 2 90 2 60 2 90港口场地价 2 642 86 2 642 86 2 642 95 2 642 90平仓价参考价 2 80 31 5 2 80 31 5 2 80 32 0 2 80 31 0最低价 2 7530 0 2 7530 0 2 7531 0 2 7530 0普通混煤(1 6 7MJ/kg以上 )火车车板价 1 90 2 0 5 1 90 2 0…     

农药化工厂循环冷却水水质稳定试验

针对某农药化工厂循环冷却水水质特点和工艺条件 ,通过静态试验和旋转挂片试验确定了其水质稳定药剂配方 ,并进行了初步的技术经济分析。试验结果表明 ,采用 HEDP和 TS-6 0 9(浓度分别为 6 mg/ L 和 1 0 mg/ L)作水质稳定剂 ,系统阻垢率可达 90 % ,碳钢、紫铜和不锈钢 3种材质的年腐蚀率均可控制在有关标准要求之内。采用水质稳定技术后 ,该厂年节约水费达 1 90余万元。     

煤炭价格

20 0 4年 6、 7月份秦皇岛煤炭价格 单位 :元 /t日 期价 格煤种6月 2 3日 6月 30日 7月 7日 7月 1 4日大同优混(2 5MJ/kg以上 )火车车板价 30 0～ 350 30 0～ 350 30 0～ 360 30 0～ 360港口场地价 32 0～ 390 32 0～ 390 32 0～ 390 32 0～ 390平仓价参考价 340～ 435 340～ 435 340～ 435 340～ 430最低价 - - - -山西优混(2 3MJ/kg以上 )火车车板价 2 90～ 330 2 90～ 330 2 90～ 340 2 90～ 340港口场地价 2 90～ 360 2 90～ 360 2 90～ 360 2 90～ 360平仓价参考价 32 0～ 41 5 32 0～ 41 5 32 0～ 41 5 32 0～ 41 0最低价 30 0～ 39…     

分离式感应器的设计和应用

近年来随着优质、高效、节能、环保热处理技术的进一步推广,感应热处理日日受到重视,涌现出大量先进的感应器设计和制造新方法。在实际生产中需要感应加热的热处理零件形状和结构多种多样,而对于不同规格的零件需要设计不同类型的感应器,这对于多品种小批量生产的企业来说,每年光设计和制造感应器所需费用就达数万元甚至几十万元,而且在使用、维修、更换和调试过程中耗费了大量的工时,不利于企业降低成本提高生产效率。针对这种现状,我们设计了一种分离式感应器,节     

红霉素肟的合成研究

红霉素A9-肟是第2代新型红霉素的共同中间体。以硫氰酸红霉素为起始原料在酸-碱缓冲溶液中合成红霉素A9-肟,对其合成工艺进行了综述,对合成工艺进行了较详细的研究,开发出了一条全新的合成红霉素肟的工艺路线,使产品转化率高于90%。优化了红霉素肟合成中溶剂配比、盐酸羟胺配比、肟化反应pH值、肟化反应温度等反应条件,做了相应的稳定性实验。改进后的合成路线适合工业化生产。     

中小型科技企业全寿命周期成本管理方案设计

中小型科技企业全寿命周期成本管理是一种实现其全寿命周期成本最小化、提高生存和发展能力的方法。在仿生学视角下将中小型科技企业的成长划分为孕育期、婴儿期、少年期、青年期、壮年期、老年期6个阶段,指出各阶段的属性、特征和成本管理应注意的事项,调查分析南阳市中小型科技企业所处寿命周期阶段和成本管理存在的问题及对策,发现其寿命周期曲线,分步设计中小型科技企业全寿命周期成本管理方案,介绍如何编制全寿命周期成本报告并进行分析应用,提出中小型科技企业全寿命周期成本管理的措施与建议。     

Enhancing Technological Practice: An Assessment Framework for Technology Education in New Zealand

The stated aim of technology education in New Zealand is to develop students' level of technological literacy. This paper introduces the Technology Assessment Framework (TAF) as an organisational tool for the development and delivery of technology programmes that focus on increasing students' technological literacy through the enhancement of their technological practice across technological areas and contexts. The TAF was developed and refined in 1999 and 2000 as part of a two year New Zealand Ministry of Education funded research project, and integrated within a national professional development programme in 2000 designed for preservice and inservice teacher educators in New Zealand.This paper backgrounds the sociocultural theoretical position of the TAF and explains how it reflects and furthers the aim of technology education in New Zealand. The TAF is then presented and explained with the aid of illustrative examples from classroom practice.     

The Nature of Technological Knowledge: Philosophical Reflections and Educational Consequences

Technological knowledge has a normative component that scientific knowledge does not have. When we have knowledge of a computer, that often comprises normative judgements: it functions well or it does not function well. In knowledge of technical norms, rules and standards as another type of technological knowledge we also find a normative component. This characteristic has consequences for our assessment of knowledge. For scientific knowledge truth is the ultimate condition. For knowledge of norms, rules and standards as a type of technological knowledge this the condition is problematic. They refer to things that do not exist yet, but are still to be designed or made. Nor truth, but effectiveness is the condition here. For technology education the normative component is important. Pupils must learn to make judgements about effectiveness, as this is a prominent characteristic of technological knowledge, that makes it distinct from scientific knowledge. Pupils must also learn to deal with ethical and other values when doing technological project work.     

A Review of: ”THE IMPACT OF GOVERNMENT SUBSIDIES ON NDUSTRIAL MANAGEMENT” by Nachum Finger Praeger Publishers,Inc.1971 124pp. $12.50

Companies' attempts to adapt to today's technological capabilities and globally competitive environment have been greatly constrained by antiquated accounting systems. Improved management accounting systems can be designed:

1) for operational control, to motivate the learning and improvement activities for managers and employees, and to provide feedback on the efficiency of operating processes;

2) for activity-based costing, to calculate accurately the profitability of individual products and customers; and

3) for capital investment decisions, to guide decisions on acquiring advanced technological capabilities. The paper summarizes recent advances in all three applications.     

Mid-entry technology strategy: the Korean experience with CDMA

Mid-entry strategy is an R&D strategy designed for an efficient utilisation of scientific and technological resources across the nations. It chooses the entry point of R&D projects in the mid-stage of technical development. The technological situation of developing countries compels them to choose the mid-entry strategies tailored to specific technologies. The development of the CDMA (Code Division Multiple Access) based digital cellular mobile communication system by ETRI, Korea's government-sponsored research institute, is an example showing the application of this strategy. ETRI utilised scientific resources owned by US based Qualcomm Ltd and co-operated with local companies for the development. In the first half of 1996 the successful commercialisation of the CDMA digital cellular telephone service was launched in Korea, ahead of all other countries. Two Korean mobile communications providers have adopted the system.     

智能温室大棚系统设计

鉴于目前中国温室大棚系统科技水平低下的现状,专门设计了一个采用PC上位机、3G传输装置和嵌入式下位机相结合的智能温室大棚控制系统,该系统可以智能地调节农作物生长所需的各项环境因数,进而使农作物生长更好,产量更高。此外,由于该系统在上位机和下位机间采用了分散控制,相比于集中控制的温室大棚系统,该系统的稳定性和使用的灵活性都得到了显著提高。     

中国工业转型升级效果评价研究

中国长期以来高能耗与高排放的粗放式发展方式已难以为继,工业转型升级迫在眉睫。本文首先梳理工业转型升级相关研究进展,设计与构建出囊括经济效益、技术创新、结构优化、绿色驱动等四大类要素的工业转型升级效果评价指标体系。然后借鉴PCA方法,利用1999～2014年23个工业行业的面板数据,测算中国工业转型升级效果指数,并剖析效果指数的变化情况以及行业异质性特征。     

Where Does Your New Technology Fit into the Marketplace?

Many companies are prepared to make considerable investments in developing technologies to support sustainable competitive advantages. Yet translating technological capability into business opportunities remains a difficult problem. Frank Lynn and Susan Heintz report their experiences with a three-level technology screening process, starting with a needs screen, moving to an economics screen and ending with a time screen. The screening process is designed to emphasize the importance of identifying realistic market opportunities and it also helps to define a product rollout timetable.     

The cosmopolitan engineering student: an analysis of a recruitment campaign for KTH Royal Institute of Technology in Stockholm

This paper presents a study that seeks to examine the messages conveyed in one of the initiatives that have been initialized in order to make young people interested in pursuing engineering studies at technological universities. The study is a case study of the web-based advertising (recruitment) campaign KTH from the Inside designed for KTH Royal Institute of Technology. The analysis draws on a theoretical framework from governmentality studies. The analysis of the campaign conclude that the ideal engineering constructed in the campaign is one of an individual who meets the requirements asked of a lifelong learner with cosmopolitan aspirations. This is an ideal that builds on a notion of progress associated with social progress and sustainability. This is a break with historical and cultural patterns, which symbolically have linked technology to capitalist profitability and masculinity. Though a break with gender patterns is suggested the ideal subject constructed in the campaign is almost exclusively based on the students on Masters’ level. This excludes students at Bachelor programmes. This I argue is problematic as it narrows the recruitment of students to technological universities to a small group of students.