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Recently, the Cradle to Cradle (C2C) theory set ground in the Netherlands, propounding that environmental impact reduction can provide a positive economical impulse to stakeholders. The building industry has warmly received this approach and considers it to be a solution to the above-mentioned burden.However, if the building sector wants to implement C2C into their practice, a paradigm shift is required. Therefore, the sector must overcome the many difficulties it encounters while striving for an eco-effective built environment.Current sustainability strategies focus on reducing the negative environmental impact of buildings. The systems theory of C2C however aims at a positive impact; this could suggest that the state-of-the-art becomes inadequate when adopting C2C as a strategy for improvement.This paper reviews contemporary systems theories and analyses them in the light of C2C, focusing on closed or continuous materials cycles. The paper finalises by describing the hiatus in and correspondence between these current theories and C2C theory.From the study we found that C2C provides new features that help continue materials, energy and water cycles, just as the contemporary theories provide potentially useful additional material for C2C. Moreover, it reveals a striking difference between the state-of-the-art and C2C. 相似文献
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The contribution of chlorinated hydrocarbons (CHCs) to environmental problems in the Netherlands is discussed in an economic
context. The economic interactions within the chlorine market, including the link to caustic soda production, are described,
and PVC is taken as a case study. Key policy options are evaluated in terms of their potential for environmental improvement.
It appears that 95% of CHC emissions causing environmental problems are due to dissipative applications. With respect to the
specific problems of ozone depletion and global warming, only a small group of compounds is responsible for most of the impact.
Moreover, economic interactions within the group of CHCs can strongly influence the net effect of environmental policy measures.
Policies aimed at a reducing volume output of certain specific groups of CHCs will inevitably lead to trade-offs between environmental
problems. The environmental impact of a hypothetical ban on CHCs is discussed in relation to the use of PVC as a sink for
chlorine. Both these options appear to have drawbacks. Moreover, no absolute conclusion can be drawn until the environmental
impact of CHC substitutes is known. 相似文献
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文章按时间顺序介绍了六个评价室内空气质量的数学模型.它们分别是歌舞厅空气质量指标模型、通风条件下室内VOC普适模型、居民住宅甲醛浓度预测模型、办公室甲醛浓度预测模型、通风条件下室内空气品质模型以及多孔建材中VOC扩散系数两尺度模型.针对每一个模型,文章都按照相应的适用条件、建模过程和应用效果进行了综述.目的是总结该领域的最新进展,为当下的检测工作与将来进一步的研究提供参考资料. 相似文献
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活动板房全尺寸火灾实验研究 总被引:1,自引:0,他引:1
通过两次板房火灾试验,分析探讨板房的屋面材料和墙板材料的选用、室内可燃物的控制、板房之间的间距、板房之间设防火隔板以及板房的整体结构耐火等问题。得出:(1)板房的屋面材料建议选用:单层彩钢板+阻燃EPS泡沫板+石膏板吊顶。(2)板房中相邻房间之间的隔墙板,建议选用双层彩钢岩棉复合板等;其它墙板选用双面彩钢阻燃EPS复合板。(3)室内可燃物方面注意控制室内可燃物的种类和数量及其分布状况。(4)板房之间的间距考虑尽量放宽,同时尽量缩短房前屋檐的跨度。(5)板房之间设防火隔板可以有效地阻止火焰的蔓延,其防火效果显著。(6)板房整体结构具有一定的耐火功能。 相似文献
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上海大气质量与材料腐蚀速度的相关关系 总被引:1,自引:0,他引:1
为了研究材料腐蚀速度与大气质量的相关关系,进行了材料暴露试验。结果表明:⑴碳钢、铜、铜合金和大理石等材料,其完全暴露的腐蚀速度约为遮蔽暴露腐蚀速度的1倍;⑵铜、铜合金的腐蚀速度与SO2浓度非常相关,与TSP浓度显著相关,碳钢的腐蚀速度与SO2和TSP浓度也有一定的相关性;⑶铜、铜合金的腐蚀速度与SO4^2-湿沉降强度明显相关,而与NO^-3湿沉降强度无明显相关;⑷碳钢的腐蚀速度约为青天铜的50倍,纯铜的15倍。 相似文献
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工业废液中镍钴的回收及在锂离子电池正极材料中的应用 总被引:1,自引:0,他引:1
探索了从废液中回收镍钴在空气气氛下合成锂离子电池正级材料LiNi2Co1-xO2的方法和工艺。结果表明,合成材料的充放电性能都比较好,LiNi0.3Co0.7O2在600℃6h-750℃16h时制得的产物初始充电容量达154.938mAh/g,接近用分析纯的镍钴原料合成的正级材料LiNi0.3Co0.7O2的首次充电容量(156.146mAh/g),采用镍钴废液合成锂离子电池正极材料,化害为利,经 相似文献
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Augusto Screpanti Alessandra De Marco 《Environmental pollution (Barking, Essex : 1987)》2009,157(5):1513-1520
Because of climatic reasons and of reduced concentrations of SO2, ground-level ozone (O3) is one of the main air pollutants in Southern Europe. Ozone levels are very high both in rural and urban locations. In the cities, O3 can affect human health and materials. Regarding materials, most relevant is the exposure to pollutants of cultural heritage buildings. In particular, monuments registered on UNESCO's list of the world heritage require special monitoring. In Italy 34% and 97% of the territory is exposed to corrosion risk higher than the tolerable level for limestone and copper, respectively. The tolerable corrosion level for limestone and copper was also exceeded in the central area of Milan. In this area the tolerable O3 concentration for copper was calculated. These concentrations (ranging between 30 and 40 μg/m3) cannot be exceeded at unchanged concentration of other pollutants to maintain corrosion levels below the tolerable ones. 相似文献
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