Occurrence of Lawn Care and Agricultural Pesticides in the Don River and Humber River Watersheds (1998–2002)

Between 1998 and 2002, surface water samples were collected from several sites in the Don River and Humber River watersheds, both tributaries to Lake Ontario, and analyzed for a variety of pesticides, including those used for urban lawn care. Analyses included 152 pesticide active ingredients and eight metabolites. Samples were collected during base flow periods (i.e., dry events) and rainfall events (i.e., wet events). The objectives of the study were to determine which pesticides were detectable, whether there was a difference in the detection frequency between the two watersheds and between upstream and downstream in each river, and whether precipitation influenced the frequency of detection. Eleven pesticides and one metabolite were detected in surface waters of the Don and Humber rivers or their tributaries, with approximately 72% of samples containing at least one pesticide attributable to lawn care use. The pesticides and pesticide metabolite detected in this study included 2,4-D, atrazine, bromacil, carbofuran, chlorpyrifos, cypermethrin, diazinon, dicamba, MECOPROP, metolachlor, metribuzin, and an atrazine metabolite (des-ethyl atrazine). Four pesticides exceeded federal or provincial water quality guidelines/objectives. Diazinon exceeded the provincial water quality objective in 28% of the samples taken. For the three other pesticides (atrazine, carbofuran and chlorpyrifos) exceedance of a water quality criteria occurred in less than 1% of the samples.     

上海市松江新城突进式发展的体制创新与探索

本文用理论和现实的案例分析详细阐述了“经营城市”的六项特征和“三赢”的理念 ,简要介绍了松江新城在财政不出一分钱的情况下为取得突进式发展所采取的制度创新和探索 ,并总结了两点如何树立规划权威性的经验。     

探讨低收入阶层住区建设的公共政策

探讨了低收入阶层住区建设的现状及弊端，从旧城改造、新城建设及住房政策三方面对解决低收入阶层住区建设问题的对策进行了研究，以妥善解决低收入阶层的住房问题，从而达到构建和谐社会的目的。     

基于非确定性思考下的城市规划新思维探讨

通过对城市规划编制与实施过程中的问题分析，提出非确定性城市规划思想的理念以及非确定性规划思想与确定性规划思想的差别，并在分析非确定性规划思想内涵的基础上，提出非确定性规划思想指导下的城市规划的新程式。     

市内通信电缆绝缘电阻特殊要求的实现和措施

本文对市内通信电缆的各生产过程进行分析、研究和控制 ,从而提出了解决绝缘电阻特殊要求的方法 ,以及改进的措施。     

辽宁省城镇居民生活用水定额

本文分析了城镇居民生活用水的特点,介绍了辽宁省城镇居民生活用水定额制定的原则、方法。通过对全省县级以上城镇居民生活用水情况的调查,制定适合辽宁省实际情况的城镇居民生活用水定额。     

城市可持续发展的水资源约束分析

自然资源与环境的可持续性是城市可持续发展的基础。在城市化加速发展的过程中,资源提供了经济发展的动力,也天然地确定了城市经济发展的边界。随着城市化水平的不断提升,我国大部分城市中水资源的需求量急剧增大,供需矛盾日趋尖锐化。作为城市发展不可缺少资源之一的水资源已经成为制约城市可持续发展的重要因素之一。     

以株洲市为例探析城市私房区的改造

首先分析了城市私房区带来的问题和改造的必然性,然后讨论了国内外私房区改造的经验和启示,最后提出了城市私房区改造的基本思路。     

Analysing the Diversity of Water Pricing Structures: The Case of France

This paper presents the results of a 2003 national survey of urban water pricing structure implemented by 429 district level water utilities. After providing some background elements on the diversity of existing water pricing structures, the paper shows how each structure can be used to achieve different management objectives (water allocation efficiency, costs recovery, and equity). It then describes the structures adopted by French water utilities, showing that flat rate are rarely adopted; declining blocks frequently used; and increasing blocks pricing which should be used to promote water use efficiency remain extremely rare. A statistical clustering is then conducted and a typology of situations elaborated. The paper concludes with highlighting that current pricing structures are influenced by past practices and that the dominant objective of water utilities is to cover costs.     

Impacts of green roofs and rain water use on the water balance and groundwater levels in urban areas

Ohne Zusammenfassung

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Impacts of green roofs and rain water use on the water balance and groundwater levels in urban areas