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龙卷风风灾的调查与评估 总被引:14,自引:1,他引:14
以江苏省为例搜集并核实了最近37年间龙卷风的事实和灾情资料,尝试性地采用专家评分方式从风灾实况对各次龙卷风的强度进行了富士达级别评定,论证了这种从具有模糊性的灾情事实中提取半定量信息方法的客观性。结果发现,各强度级别是龙卷风的累积分布可近似用两段指数函数拟合。在此基础上,定量地给出了江苏省龙卷风频率和强度的地域分布,各级龙卷风的平均再现间隔年数等统计指标。 相似文献
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Andrew M. Crowe Ai Sakata Colin McClean Malcolm S. Cresser 《Water, Air, & Soil Pollution: Focus》2004,4(6):75-84
Factors influencing soil profile nitrogen storage (SPNS) in GB have been investigated. The SPNS values of moorland peats and podzols in the South Pennines, of permanent grassland in Yorkshire, and of adjacent arable-, semi-permanent grassland- and ancient woodland-soils in Worcestershire have been compared to assess land use effects. The soils exhibited similar SPNS values, because changes in bulk density and organic matter composition offset increases in N concentrations in highly organic soils. Data from the Soil Survey of Scotland were used to show effects of soil parent material on SPNS were also small. Data on Scottish podzol soils under heather moorland and derived from sandstone or quartzite were used to show that SPNS declined with increasing precipitation, but increased with the amount of pollutant N deposited from the atmosphere. 相似文献
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适应市场经济新形势,加快贫困地区经济开发 总被引:1,自引:0,他引:1
本文论述了贫困地区经济开发在发展社会主义市场经济新形势下面临的问题,并对加快经济开发对策进行了探讨。 相似文献
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Hiramatsu Ai Hanaki Keisuke Aramaki Toshiya 《Mitigation and Adaptation Strategies for Global Change》2003,8(3):293-310
The Clean Development Mechanism (CDM) was adopted in the Kyoto Protocol as a flexibility mechanism to reduce greenhouse gases
(GHGs) and has been started with such projects as improving efficiency of individual technology. Although applying various
countermeasures to urban areas has significant potentials for reducing GHGs, these countermeasures have not been proposed
as CDM projects in the practical stage. A CDM project needs to be validated that it will reduce GHGs additionally compared
with a baseline, that is, a predictive value of GHG emissions in the absence of the project. This study examined the introduction
of solid waste incineration with electricity generation into three different cities, A, B and C. The combination of main solid
waste treatment and fuel source are landfill and coal, respectively, in City A, incineration and natural gas in City B, and
landfill and hydro in City C. GHG emission reductions of each city under several baseline options assumed here were evaluated.
Even if the same technology is introduced, the emission reduction greatly varies according to the current condition and the
future plan of the city: 1043–1406 kg CO2/t of waste in City A, 198–580 kg CO2/t in City B, and wide range of zero to over 1000 kg CO2/tin City C. Baseline options also cause significant difference in the emission reduction even in the same city (City C).
Incinerating solid waste after removing plastics by source separation in City B increased GHG emission reduction potential
up to 730–900 kg CO2/t, which enhances the effectiveness as a CDM project.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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