Tax neutrality and the Saskatchewan Uranium Royalty

In their analysis of the Saskatchewan Uranium Royalty (SUR) scheme Anderson and Barnett (1983) conclude that the scheme is effective in that, together with the other levies on the uranium industry, it succeeds in appropriating 75–80% of available economic rent under reasonable assumptions about uranium price and production costs. While collecting a substantial proportion of economic rent was a major provincial government objective in designing the tax structure, provincial tax planners may also have been concerned to ensure that marginal production decisions be affected as little as possible by the tax. Because their model of the Key Lake mine considers only the extraction plan adopted by the firm, Anderson and Barnett are unable to conclude whether a different plan would have been adopted in the absence of the tax. In other words, the nature of their model confines their investigation to the question of effectiveness, as defined above. The purpose of the present article is to examine the question of whether the SUR is likely to be neutral with respect to the extraction plan and to assess the effects of any tax-induced distortion.     

植物修复技术在铀矿山放射性铀污染治理中的潜在应用

植物修复技术用于治理环境中的放射性污染，具有成本低廉、易于实施和对环境扰动小等突出优点，是近年来国内外有关研究的热点。本文简单介绍了植物修复的原理，系统地介绍了环境中铀污染的植物修复及影响修复效率的因素。分析了该技术应用于铀矿山放射性铀污染治理的可行性。     

VIRGINIA USA WATER QUALITY, 1978 TO 1995: REGIONAL INTERPRETATION1

ABSTRACT: Nine surface water‐quality variables were analyzed for trend at 180 Virginia locations over the 1978 to 1995 period. Median values and seasonal Kendall's tau, a trend indicator statistic, were generated for dissolved oxygen saturation (DO), biochemical oxygen demand (BOD), pH (PH), total residue (TR), nonfilterable residue (NFR), nitrate‐nitrite nitrogen (NN), total Kjeldahl nitrogen (TKN), total phosphorus (TP), and fecal coliform (FC) at each location. Each location was assigned to one of four physiographic regions, and mean state and regional medians and taus were calculated. Widespread BOD and NFR improvements were detected and FC improvements occurred in the state's western regions. TR and TKN exhibited predominantly increasing trends at locations throughout the state. BOD, TKN, NFR, and TR medians were higher at coastal locations than in other regions. NN, TKN, and TR exhibited predominantly increasing trends in regions with high median concentrations, while declining trends predominated in regions with relatively high BOD, FC, and NFR medians. Appalachian locations exhibited the greatest regional water‐quality improvements for BOD, FC, NFR, and TKN. Factors responsible for regional differences appear to include geology, land use, and landscape features; these factors vary regionally.     

铀在土壤中的吸附动力学

以四川盆地红层丘陵区涪江河谷两岸广泛分布的第四系中更新统亚粘土为对象,用动态法测定了铀在该土壤中的平衡吸附量,为极低放废物的处置提供一些理论依据。研究了流速、土壤粒度及铀溶液初始浓度对土壤吸附铀的影响,并用常用的吸附动力学方程对实验数据进行了拟合。结果表明：土壤粒度小的平衡吸附量较大;流速越小、平衡吸附量越大;铀溶液的初始浓度越大,平衡吸附量越大;在用动力学方程拟合时,E lovich方程的拟合度最好;该土壤对铀的最大吸附率为61.1%,吸附性能较差。     

铀吸附实验研究现状

介绍了铀吸附实验的研究现状，对吸附铀的各种载体进行了总结。目前，主要采用静态法（批示法）和动态法（柱法）进行铀的吸附实验研究。吸附铀的载体主要有粘土，金属的水合氧化物等肢体，藻类及菌类，树脂等。主要考察pH值、温度、吸附时间、阴离子、阳离子、细菌浓度、铀浓度等对吸附速率及吸附量的影响。     

Bypassing the flush,creating new resources: analysing alternative sanitation futures in London

The flush toilet is an illogical form of sanitation from the point of view of water conservation, nutrient recovery and water pollution. Places such as London, with one of the oldest flushing toilet and sewer systems in the world, bears witness to the limits of its universal applicability through dwindling freshwater resources and polluted waterways. It is therefore important to develop new forms of sanitation infrastructure. An actor–network theory coevolution framework is used to explore and gain insights into the coevolution pathways for new types and paradigms of sanitation in London, where waterborne sanitation is currently prevalent. This approach shows that while flushing toilets are currently stable network configurations, there are coevolution pathways that would shift the system towards dry sanitation. The quantity of freshwater resources available for toilet flushing was the main actant cited for the development of these coevolution pathways.     

挥别伦敦奥运

四年一度的奥运盛典今夏在伦敦盛大开幕。回望这场盛会，盘旋在我们心底的不止是惊心动魄的各项赛事和动人心弦的新纪录。在中国健儿们奋发拼搏冲击奖牌的同时，赛场内外频频闪现的“中国制造”在以另一种独特的方式参与到这场盛会中。值得我们回望盘点的还有“绿色奥运”。     

Uranium stockpiles : Their influence on the market for natural uranium

This article considers the growth in stockpiles of natural and enriched uranium, which have now reached such significant proportions and analyses the effect that the stockpiles might have on the market for natural uranium in the coming years. While stockpiles have not yet reached their peak in absolute terms, they have already passed it in relative terms, ie in multiples of annual demand.     

Assessing London,Ontario's brownfield redevelopment effort to promote urban intensification

Intensification of existing urban areas is currently a major item on the policy agenda of the Ontario and Canadian governments. As part of the urban intensification drive, brownfield sites have become major candidates for redevelopment. Governments at all levels have initiated policies and programmes to encourage their remediation and redevelopment. This paper reports the findings of a qualitative exploration of brownfield redevelopment in London, Canada. Through in-depth interviews (n?=?17) with key stakeholders involved in brownfield redevelopment, the study explores the level of participation in brownfield redevelopment, barriers to brownfield redevelopment in the city, and perceptions about financial incentives in the city's Brownfield Community Improvement Plan. The study found that despite the availability of financial incentives, the overall private sector participation in brownfield redevelopment is low due to barriers such as competition from greenfield, risk, cost, negative public perception of brownfields, and complex remediation processes. The paper provides policy suggestions that may contribute to a more active participation in brownfield redevelopment in the city.