棒线材轧制批量调度多目标混合优化

在分析批量调度问题特征的基础上建立了精轧工序轧制批量调度的数学模型,采用混合自适应多目标进化算法进行求解．在该算法中,采用全局搜索与局部优化相结合来加快算法的收敛速度,基因修正与罚函数相结合来解决约束问题,运用免疫共享方法维护种群的多源性,根据评估结果自适应改变遗传操作的概率．应用生产实际数据进行测试,表明该调度方法能获得所需的Pareto优化前沿．     

察哈素煤矿掘进工作面合理空顶距的确定

为确定察哈素煤矿3103工作面连续采煤机掘进巷道空顶距的合理长度,根据测量仪器观测数据的分析研究,最终得出掘进巷道合适空顶距为7.3 m。克服了空顶距选择的盲目性,实现了空顶距选择的定量分析,保证了巷道掘进的速度和安全性,为煤矿高效生产提供了指导。     

世界遗产柏林现代主义住宅区揭示的遗产保护新趋势与理念

德国是一个文化遗产丰富的西方发达国家,在遗产保护领域走在世界前列.本文以世界遗产地柏林现代主义住宅区为主要实例,深入分析遗产地的特点、申遗理由、价值内涵,揭示作为现代主义运动主要发源地的德国对这项重要的20世纪文化遗产保护中体现的新理念、新趋势,并得出以下结论:注重保护20世纪遗产将使遗产保护观更趋完整,它们是历史记忆不可或缺的一部分.这些“年轻的”遗产将为城市和地区未来的发展提供一个更加完整的历史文化坐标,使之不会在全球化爆发式的大发展中迷失自我.     

Heuristic search algorithms for lot streaming in a two-machine flowshop

The objective of this paper is to propose and evaluate heuristic search algorithms for a two-machine flowshop problem with multiple jobs requiring lot streaming that minimizes makespan. A job here implies many identical items. Lot streaming creates sublots to move the completed portion of a production lot to second machine. The three heuristic search algorithms evaluated in this paper are Baker’s approach (Baker), genetic algorithm (GA) and simulated annealing (SA) algorithm. To create neighborhoods for SA, three perturbation schemes, viz., pair-wise exchange, insertion and random insertion are used, and the performance of these on the final schedule is also compared. A wide variety of data sets is randomly generated for comparative evaluation. The parameters for GA and SA are obtained after conducting sensitivity analysis. The genetic algorithm is found to perform well for lot streaming in the two-machine flowshop scheduling.     

带有信息的建筑

文章介绍了两德统一后在德国新首都都柏林开工建设的具有代表意义的几个使馆项目：法国使馆、英国使馆、美国使馆、荷兰使馆、奥地利使馆等。介绍了使馆建筑的功能组成。概述了德国海外外交建筑的组成类型，为读者打开了一扇了解外交建筑的大门。     

An iterative procedure for lot streaming in job-shop scheduling

The issue in Lot Streaming is to split lots into sublots in order to improve the makespan (or some other criterion). We present a model and an iterative procedure in a general job-shop environment. In a first step, optimal sublot-sizes are computed given a sequence of sublots on the machines. In a second step, a better sequence is computed by solving a standard job-shop scheduling problem with fixed sublot-sizes. Some computational results on a sample (including the famous 10-10) are reported. In case of no set-up, in few iterations, the makespan approaches a lower bound with few sublots.     

精锌锭打印装置的设计

论述了一种新型打印装置的设计，该装置与铸锭机联动，从而实现精锌锭生产批号的自动打印。     

Nothing More than a Fragile Edge: Blurring the Boundaries with Mario Cucinella

The main focus of Mario Cucinella's work is an overlapping preoccupation with technology and the natural environment. In his hands buildings are transformed into complex climatic machines. Anna Giorgi explains how, when combined with an instinctive sense of place, these concerns allow Cucinella's buildings to remain open objects, fragments of a greater natural or urban system. Copyright © 2007 John Wiley & Sons, Ltd.     

Confronting the Contemporary: Stefano Boeri

Diego Caramma describes Stefano Boeri's pervasive influence on architectural thought in recent years as editor of Domus, exhibition curator and founder of the Multiplicity urban research platform. As he explains, Boeri's significance lies in his ability to confront contemporary conditions for architecture rather than just the dissemination of current trends and ideas. Copyright © 2007 John Wiley & Sons, Ltd.     

Failures of Berlin Freedom Bell since 1966

On October 24th 1950 the “Freedom Bell” rung for the first time in the tower of the former West Berlin town hall. One year after the Berlin blockade and at a first climax of the “Cold War”, the “American National Committee for a Free Europe” donated the bell to the city of West Berlin. The bronze bell has a weight of about 10 tons. Its clapper has a length of 2.40 m and a weight of nearly 1 ton. In 1966 the hanging of the clapper and in 1979 the clapper of the bell broke down. Both failures were found to be caused by fatigue fracture. In 1974, a crack in the bell body was detected. After years of periodic monitoring using non-destructive testing, the crack was closed in 2001.