城市大型给水工程系统迁建设计

在环保督察背景下,城市饮用水水源保护问题凸显。以铜陵为例,介绍城市大型取水口、对应水厂系统迁建设计案例。铜陵市三水厂横港取水口水源保护区内存在多座码头,结合铜陵市长江岸线规划、现状供水布局及存在问题,将横港取水口、三水厂整体迁建至下游新民取水口附近,设计规模为30万m^3/d,同步建设配套给水管道,将原三水厂改造为加压泵站,工程建成后逐步关停现状一、二水厂,形成更加科学合理的供水系统。     

雾霾治理的偏好性--以奥运期间首钢搬迁为例

中国在近些年的经济发展规划中提出经济转型计划--走资源节约型,环境友好型的发展道路,这说明环境治理工作是一项不可忽视的、对社会各方面进程均会产生影响的任务。但是,环境治理需要顶层设计和路径选择。本文主要以首钢搬迁为例,讨论在治理以雾霾为代表的环境治理中,偏好性事实的产生及其后果。     

合成氨装置搬迁改造项目CO_2吸收塔主要参数的确定

介绍美丰100kt/a合成氨装置搬迁改造项目整体更换CO2吸收塔的实例,对新CO2吸收塔的主要参数进行了确认计算。生产实践表明,CO2吸收塔各主要设备参数的选择、内件及填料的选型是符合实际要求的。     

加强管线搬迁工程的投资控制

市政工程中,自来水、煤气、通信、电力四大管线搬迁费用,占相当的比重。为了努力将管线搬迁投资控制到一个合理的水平,介绍了事前控制(包括邀请招标、合同签订、预付款支付)、事中控制(包括注重施工方案、深入现场)和事后控制(包括合理采用定额、合理取定材料价格、准确核定工程数量)等的具体内容和方法。     

文物建筑搬迁保护选址的可拓方法分析

搬迁保护是文物建筑保护的措施之一．选址又是其中非常重要的一环。该文运用可拓学的原理与方法。如发散树、蕴含系分析方法和相容度判别、优度评价方法。对以往迁址保护比较成功的案例进行分析。进一步验证了选址的科学性。因此，可拓方法能够完善选址的科学性和系统性，可拓学将为文物建筑搬迁保护新址的选择和论证提供一个可行的方法。     

对城市建设拆迁中土地制度的思考

分析了城市建设拆迁中土地权力关系变化及其利益格局变化的过程,指出现行城市土地制度由于存在土地收回权的行使范围扩大化、拆迁补偿标准不合理、安置不妥善、程序不合理等缺陷,已不适应城市建设拆迁中土地权利关系变化的需要,因而认为土地制度创新势在必行,进而提出了土地制度创新的初步设想,包括:明确城市建设拆迁中被拆迁人的土地财产权利;对“公共利益的需要”作出明确的界定,规范政府行使土地收回权的范围;充分考虑被拆迁人对土地的权利,给予公平、合理的市价补偿;提高房屋拆迁补偿标准,完善拆迁安置办法;从保护群众合法权益和规范政府行为出发,完善城市建设拆迁程序等。     

Start-ups and relocations: Manufacturing plant location in Portugal

This article analyses the spatial pattern of plant start-ups and plant relocations in Portugal between 1986 and 1997. The results show that start-ups and relocations are not attracted by the same set of location characteristics. The probability of a plant start-up is more strongly related to increases in local market size and labour force qualification, lower labour costs, and a more diversified economic environment. In contrast, relocations show a greater preference for areas with better national market accessibility, availability of producer services and a larger industrial basis. Relocations are also much more strongly attracted by the provision of inter-regional motorways. The results are consistent with the assertion that firms value location attributes differently over the plant life cycle.Received: 29 January 2003, Accepted: 3 March 2004, JEL Classification: L6, R3, R4Financial support from the ESRC, grant T026271031 and grant RES-000-22-0056 is gratefully acknowledged. I would like to thank Paulo Guimarães for his invaluable assistance with the establishment data for Portugal and his helpful suggestions, and Peter Bibby for his support with GIS programming. I have also benefited from comments and suggestions by Harvey Armstrong, Max Craglia, John Henneberry, and Ricardo Mora.     

无形文化遗产的异地保护与开发——以湖南大崇山文化生态园规划为例

通过对无形文化遗产异地保护必要性的理解，对无形文化遗产保护与旅游开发相结合进行了一种新的尝试。     

工业搬迁企业原场地土壤Pb、Cd、Hg、Cr污染研究

针对城市建成区工业企业搬迁原生产场地土壤污染问题，采用单因子指数法、内梅罗指数法和地累积指数法等方法，对原场地土壤中Pb、Cd、Hg和Cr污染程度进行研究。研究结果表明:单因子指数法评价土壤中Cd元素是主要污染因子，属于重污染；Pb元素为中污染；Hg、Cr元素为未污染。内梅罗指数法评价土壤中 Pb、Cd和Hg元素为重度污染，Cr元素为安全；点位1、11和13为重度污染，点位7为中度污染，其他为轻度污染、警戒及安全。地累积指数法评价土壤中Cd元素为偏中污染，Pb元素为轻度污染；Hg和Cr元素为清洁；点位1为中度污染，点位11和点位13为轻度污染，其他点位污染等级为清洁。     

Particle Effects on Penetration and Solidification of Flowing Mixed Melts on Metal Structures

In severe-accident analyses of liquid-metal-cooled reactors, assessing the relocation and solidification of disrupted core materials is of importance. We investigate here the fundamental characteristics of these behaviors in flowing melt mixed with solid particles under various conditions. To simulate the melts, we use a low-melting-point metal (viz., Bi-Sn-In alloy) mixed with various concentrations of copper and bronze as solid particles; the flow channels used were inclined open ones with a V-shaped cross section made of either stainless steel or brass plate. Transient melt flow was recorded, and melt penetration lengths and frozen melt distributions along the channel were measured. Results indicate that penetration length decreases for molten-metal/solid particle mixtures (mixed melts) compared with a pure molten metal (a pure melt), as well as decreases with decreasing solid particle size and increasing particle volume fraction in the melt. For the pure melt, we found only one freezing mode of all melt adhesions along the channel, whereas there were two freezing modes of melt separation with high solid particle concentrations, as well as melt adhesion, along the channel for mixed melts. The results obtained will be utilized in an experimental database to validate and improve physical models used for reactor safety analysis codes.