两段法生产砂状氧化铝附聚过程的研究

本文在试验的基础上．分析了高浓度铝酸钠溶液两段法分解工艺中各因素对附聚效率的影响，并总结出最佳的附聚条件。将该条件用于生产实践后，种分系统粒度波动幅度大大减小．整体粒度明显增大，取得了令人满足的结果。     

对高架路桥周边空间的分析及合理化设计

针对高架路桥引发的一系列问题,通过对近些年来国内高架路桥现状的调研和分析,对目前我国高架路桥周边空间的特征和存在的问题进行了研究,在对已有经验总结和改进的基础上提出了对此类空间的合理化设计方法。     

关于《城镇道路工程技术标准(征求意见稿)》的探讨

文章针对新近发布的《城镇道路工程技术标准》(征求意见稿),结合现行设计规范和实践工程中的可操作性,分析了新标准的改进之处,并提出了关于路面结构和公交停靠站等方面的可商榷内容和建议增补的内容。     

环境革命与城市发展

阐述了对环境革命的认识 ,包括环境革命的产生背景、环境革命的思想观念、环境革命的深层价值等八个问题 ,并从城市发展契机、城市发展观、城市生态功能、城市环境容量、城市环保产业、城市空间格局、城市环境安全、城市规划的生态学化等十一个方面论述了环境革命对城市发展及城市规划的影响。     

The electronic superhighway: Melbourne's CityLink Project

Melbourne's CityLink, the largest private construction project in the world, promises motorists a new mobility which eases the conventional gridlock-freeway impasse. Based on an electronic toll system, it also represents an interesting case study of how information technology can facilitate improved urban transit systems. However, such benefits, which in this case accrue to the construction company and motorists, may be illusory for the transport and urban welfare of the city as a whole when aesthetic, environmental and community questions are considered.     

城市生态的自然回归——波特兰雨园

本文以波特兰雨园为案例,就城市景观作为城市环境不可或缺的重要部分,如何在迎合城市发展的过程中,真正化身为城市生态系统的一个有益环节,协调优化城市与自然的关系,营造丰富并具有深度的体验场所的问题展开分析。     

In search of a stable urban regime for Montreal: issues and challenges in metropolitan development

As with many major North American urban areas since the 1960s, Montreal has faced contextual changes that have brought to the fore the question of its development. However, because of its history and the uncertainties linked with Quebec's constitutional future, attempts to stimulate its development have required certain compromises, often with unexpected results. In order to evaluate the performance of coalitions formed with the objective of meeting the challenges associated with urban and metropolitan development, we have drawn upon the concept of urban regimes. Focusing specifically on Montreal, we ask whether it is possible to transpose urban regime analyses that consider both structural and cultural factors specific to local organized forces. Revealing though they might be, these analyses nevertheless possess certain limitations, notably the underestimation of the weight and increasing importance of players and forces occurring on a metropolitan scale. This is particularly true in the case of Montreal.     

Hydraulic habitat composition and diversity in rural and urban stream reaches of the North Carolina Piedmont (USA)

The differences between urban and rural streams regarding hydrological process, channel morphodynamics and ecosystem functioning have been highlighted by a number of studies in recent decades. The need to understand lotic ecosystem functioning in these environments at scales relevant to individual organisms has led to research focusing on hydraulic composition and structure over small areas of channel bed. In this study we map and analyze the hydraulic biotope composition of two urban and two rural stream reaches in the North Carolina (USA) Piedmont to determine if urban flow regimes and attendant channel modification processes might translate into important differences in hydraulic environment, and if so, what those differences are. Hydraulic biotope assemblages were found to vary only moderately in diversity per unit stream length between sites, but were distinctly different in composition. One important control on the differences between rural and urban streams was found to be the localized incision of urban channels into bedrock and saprolite. Resistant rock outcrop in the beds of urban streams creates rapid and riffle biotopes and long stretches of upstream pool habitat by impoundment. Urban reaches were found to be more homogeneous than rural reaches in hydraulic composition and were dominated by pools. Rural reaches, characterized by copious sandy alluvium in the bed, were dominated by runs or glides. Quantitative differentiation of biotopes based on four hydraulic indices generally yields coherent associations, although these may vary in content. Comparisons between hydraulic and biotic diversities suggest relationships favoring biotic functional group aggregation over species richness‐based indices of diversity. Because the majority of published hydraulic diversity analyses are based on coarse‐bed streams, further study of hydraulic diversity in streams with finer substrate is likely to be beneficial. Copyright © 2008 John Wiley & Sons, Ltd.     

共同沟的特点以及在居住小区的应用

简述了共同沟的优越性,结合重庆某高档别墅小区的概况,介绍了共同沟的实际应用情况,实践表明,共同沟运行良好,为设计人员在选择和利用共同沟时提供了参考借鉴。     

醇水共沉淀法制备氧化锆超细粉末及团聚控制

以氯氧化锆和氨水为原料，在醇水溶液中制得氧化锆前驱体，经过陈化和低温处理后干燥，前驱体在600℃下煅烧后球磨得到氧化锆超细粉末。采用TG—DSC，XRD，TEM分别对制备的粉末进行了分析。研究表明在共沉淀过程中引入无水乙醇，采用低温处理工艺，能减少粉末的团聚，避免硬团聚的形成。运用该方法可以制备出粒度为20～30nm、少团聚的超细氧化锆粉末。