应力分析在锅炉设计中的作用

本文从技术的角度,举例详细说明了应力分析工作在锅炉设计制造过程中的作用--通过优化设计,节约时间、控制成本,从而提高企业生产效率及经济效益.     

A theoretical framework for examining the role of third-party certifiers

Third-party certifiers play a significant role in the global food system. The information economics literature provides a rich theoretical structure for understanding the emergence of third-party certification bodies. In this theoretical structure, third-party certifiers provide market signals concerning food quality claims. Successful third-party certifiers ensure buyers of food quality and reduce the potential for market failure that might otherwise occur when information about food quality is uncertain and information is asymmetrically distributed.     

甬杭地区天然气管道的设计优化

根据甬杭地区天然气用户的情况和需求,确定了合理的天然气长输管道线路走向和输气站场、压气站的设置,并根据具体情况,有针对性地进行了有关管道通过城镇地段的处理、天然气的计量交接和调峰的设计优化,可以有效地降低管道建设的建设投资,减少生产运行的能量消耗,最大限度地提高管道建设及运行的综合经济效益。     

面临新世纪的中国矿业经济

知识经济对我国矿业的发展至关重要。文章在分析中国矿业经济,阐述矿业经济形态的基础上,指出了矿业面临亟待解决的课题,即深化与转变对自然资源价值的认识,走出封闭小天地,进入社会经济大循环,使矿业市场更加国际化,同进应加强高技术素质人材的培养,以适应全球竞争的需要。     

The economics of a solar/diesel hybrid — A case study

The energy system, discussed, was a typical hybrid where a farmer decided that with the escalating cost of diesel as well as the logistics attached to the supply of diesel to his farm, adding a photovoltaic array to his diesel based system would make economic sense. A study of the energy consumption in comparison with the cost input for different scenarios was carried out.     

网络经济与皮革工业(I)我国互联网经济的发展历程

我国的互联网产业紧随世界潮流 ,在经历了最初的概念推广到圈地热潮直到 1 999年的电子商务热之后 ,互联网已经开始全面渗透到各个传统的行业 ,皮革行业也同样受到网络的冲击。本文较为详细地介绍了我国互联网经济发展的历史、现状和信息化发展水平。     

Economics of solar air pre-heating in south Indian tea factories: a case study

Tea processing is an energy intensive operation requiring both thermal and electrical energy. Hot air at a temperature of 100–130°C for tea drying and withering has been obtained in the past by burning coal or firewood. Over the last four years, roof integrated solar air heating systems have been introduced in some of the tea factories of south India, as a partial energy source. This paper aims to present the economical analysis of one such system: a 212 m² collector area system that has been in operation for 2.75 yr. The system has reduced specific fuel consumption for tea production from 0.932 to 0.71 kg/kg dmt (drier mouth tea), which represents a fuel savings of approximately 25%. The economic analysis considered the annual investment cost and return cost and included concessions offered by the Government. It shows a payback period of from two to four years, depending upon whether the company is profit making or non-profit making. This work has helped to establish the economic viability of this method.     

利用"数据挖掘"技术解决矿山资源危机的可行性研究

阐述了在解决老矿山资源危机的找矿勘探、矿产经济研究、尾矿和废石的利用等方面新采取的对策，应用数据挖掘技术的可行性，并就数据挖掘技术在矿山中的应用提出了一些建议。     

多层反射型保温结构热经济性优化

通过分析间距对多层圆筒反射型保温结构散热损失及当量导热系数的影响 ,计算了不同条件下散热损失最小的间距分布 ,得出了最佳间距分布 ,提出了多层圆筒型反射型保温结构的优化变间距分布布置设想。与等间距结构对比 ,这种新型结构可进一步改善隔热保温效果 ,提高热经济性     

Revisited Progressive Second Price Auction for Charging Telecommunication Networks

Flat-rate charging of telecommunication networks does not seem relevant anymore as it creates congestion (like in the Internet). Among usage-based charging schemes, auctionning for bandwidth looks very promising. We review here the tremendous work called progressive second price auction and give some new results about users' behaviour in order to prove the results published in the literature.