上海国际航运中心集疏运体系“十二五”发展之我见

评估了上海国际航运中心集疏运体系"十一五"期间的成就与问题,分析了该体系在国民经济未来发展中可能面临前所未有的压力,并结合上海国际航运中心集疏运体系"十二五"期间面临的发展形势,提出上海国际航运中心集疏运体系发展的目标和发展思路。     

关于职校生职业生涯设计教育的实践与研究

职业生涯是一个人一生的职业经历和发展道路。职业生涯设计是根据经济社会发展和个人发展需要,结合外部环境和本人实际,制定未来职业生涯的发展规划。本文探讨了如何对职校生进行职业生涯设计教育,给出了方法和结论。     

The dune size distribution and scaling relations of barchan dune fields

Barchan dunes emerge as a collective phenomena involving the generation of thousands of them in so called barchan dune fields. By measuring the size and position of dunes in Moroccan barchan dune fields, we find that these dunes tend to distribute uniformly in space and follow an unique size distribution function. We introduce an analytical mean-field approach to show that this empirical size distribution emerges from the interplay of dune collisions and sand flux balance, the two simplest mechanisms for size selection. The analytical model also predicts a scaling relation between the fundamental macroscopic properties characterizing a dune field, namely the inter-dune spacing and the first and second moments of the dune size distribution.     

More than a master plan: Amman 2025

The recent plan for Amman, Jordan, combined elements of both master planning and strategic planning while pushing beyond the boundaries of both to incorporate governmental reorganization, national development concerns, and the “branding” of the city. The paper explores this deviation from traditional master planning and documents the innovations that emerged from a commitment to bring planning and implementation closer together in time and use the planning process to build planning capacity in Amman and throughout Jordan. As planners continue to negotiate between holistic visions and the pressures of development, Amman 2025 exposes the strengths and weaknesses of strategic planning and offers useful lessons.     

Production of in situ aluminum-titanium diboride master alloy formed by slag-metal reaction

Al-TiB₂ master alloys have received much attention in recent years owing to their potential as efficient grain refiners for aluminum foundry alloys. In this study, the process of production of master alloys was investigated to develop a low cost method, namely, slag-metal reaction. This method can be used to fabricate Al-TiB₂ master alloy in situ from the TiO₂-H₃BO₃-Na₃AlF₆ and Al system. Since the price of the raw materials is low and the technology is simple, the processing technique appears to reduce the cost of the master alloy. Because of exothermic reactions, not much energy is needed to melt materials. In this process, Titanium diboride particles were formed in situ through the reactions of TiO₂, H₃BO₃ and Na₃AlF₆. Results showed that when the aluminum melted, the condensed TiB₂ particles that formed in situ were spherical with an average diameter of 1 μm. Furthermore, these TiB₂ particles were distributed uniformly through the master alloy.     

基于MasterCAM的印章加工方法研究

印章是常见的办公用品.利用MasterCAM软件对印章进行了加工设置,介绍了采用曲面加工对印章进行加工的方法,达到了提高加工效率,提升加工质量的目的.     

从皇城到投资者的城市—北京城的扩展与建设

北京具有2000多年的城市历史，留下许多层面的城市结构和建筑类型，目前，北京城的心脏依然是故宫，而且老城的几何秩序似乎仍然主宰着整个大都市，作为13亿人民的政治和文化中心的北京，正寻找着能够充分体现现代化成就和中国特色的建筑风格，北京也同样必须作出巨大的努力，来解决实现了房屋，基本设施和环境问题，最后，北京需要一个区域性发展的新概念，来控制城市的动态扩张。     

变导程锥状正螺旋面的研究及其投影图与展开图画法

本文分析了变导程螺旋运动的一般规律及方程,对由此形成的变导程锥状正螺旋面以及决定该曲面投影图与展开图画法的变导程圆柱螺旋线和变导程圆锥螺旋线进行了研究,建立了它们的参数方程.从而为变导程锥状正螺旋面的画法找到了依据,也为计算机绘制其投影图与展开图提供了数学模型.     

网络技术在高炉建设管理中的应用

总结应用网络管理技术在实施柳钢4号高炉施工管理中的经验。     

"九五"期间我国能源需求预测问题的探讨

分析了“九五”期间中国能源生产与消费特点 .结果表明 ,2 0世纪 90年代对我国能源需求的预测结果均与“九五”期间我国能源消费的实际状况背离 ,从而对能源需求预测产生巨大困惑并面临新的抉择 .在分析“九五”期间我国能源消费需求总量下降和能源生产以及消费结构变化原因的基础上 ,提出了几个值得探讨的问题 .