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841.
Water is a resource that is essential for all life on Earth. An exponentially growing human population, in addition to unprecedented
industrial and technological development, threaten the availability and quality of this resource. Climate change and ozone
depletion are two major environmental problems facing mankind today. These problems have the potential to further strain currently
available freshwater resources. Recent research has shown that climate change and ozone depletion are linked phenomena and
their interaction exacerbates their impact. Changes in precipitation, surface runoff, solar UV radiation, temperatures, and
evaporation are some of the predicted outcomes of climate change and ozone depletion. They influence the biogeochemical cycles
and aquatic ecosystems in lakes and rivers, and alter the character of natural organic matter (NOM) and, consequently, they
have the potential to affect the quality, quantity and treatability of our water resources. Given these uncertainties, and
the need to mitigate the consequences of climate change and ozone depletion, the issues of changing water quality, quantity
and treatability cannot be ignored by Australian governments and water utilities. 相似文献
842.
研究了大田栽培和自然光条件下,模拟UV—B辐射(UV—B,280~315nm)增强对春小麦生物量累积和产量的影响及评估。UV—B辐射导致叶、茎、根、穗生物量和总生物量累积降低,生物量分配改变,籽粒产量降低。5.31kJ/m2UV—B辐射处理还明显降低收获指数。模型分析表明,UV—B辐射降低总生物量累积速率,总生物量随UV—B辐射增加而降低。预测模型表明,10%和20%的臭氧衰减导致的UV—B辐射增加使籽粒产量、叶和穗生物量明显降低,而根生物量降低较小。 相似文献
843.
844.
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846.
UV消毒法在水处理工艺中的应用前景 总被引:11,自引:0,他引:11
概述了水处理工艺中UV消毒法的应用近况、低压多灯UV消毒装置的优点及有待深入研究的若干问题。预期UV消毒法可能取代加氯消毒法、在水处理消毒工艺中得到广泛的应用推广。 相似文献
847.
为探究古城镇建筑的火灾热辐射规律,有效防范火灾,为古城镇建筑消防改造提供参考,以某城中村古建筑为例,运用热辐射理论原理,分析了建筑火灾时门窗的正对位和非正对位的热辐射特征,总结出古城镇建筑火灾时洞口和外立面热辐射的一般规律:正对位辐射时,接收面辐射通量大小随建筑木制外立面门窗洞口的增大而增加,存在安全距离;非正对位辐射... 相似文献
848.
特殊人工环境对武器装备的危害 总被引:2,自引:2,他引:0
给出了在战争条件下特殊人工环境的定义,并举例说明了人工环境在古今战役中的应用,具体阐述了烟尘环境、核环境、电磁辐射环境和生化有毒沾染环境等4种特殊人工环境对武器装备各方面的危害,最后指出了在现代高技术战争中研究特殊人工环境对武器装备危害的重要性和必要性. 相似文献
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850.
Tohno S Ma CJ Hayakawa S Yamasaki S Kasahara M 《Environmental monitoring and assessment》2006,120(1-3):575-584
The X-ray microprobe system was applied to ultra trace characterization of single Kosa aerosols and non-Kosa aerosols simultaneously collected at Yasaka, Japan and TaeAnn, Korea. We demonstrated remarkable mass increase of heavy metals as well as soil components in individual particles during the Kosa event compared with the non-Kosa period at Yasaka. Backward trajectory analysis suggested that the Kosa samples were in the mixing state of mineral components and anthropogenic heavy elements. Double thin film method was applied to investigate the seasonal change of the mixing states of single sea-salt aerosols associated with chlorine loss due to the heterogeneous reactions between sea-salt particles and acidic gases. It was revealed that the percentages of both chloride-nitrate mixed particles and sulfate-nitrate ones were larger in wintertime than those in summertime and fraction of chloride-nitrate mixed particles increased with an increase of particle size. Comparison between the size-segregated bulk analysis and the single particle analysis demonstrated that remarkable chloride depletion occurred in coarse particles sampled on May in the former analysis, while chloride depletion in coarse particles was not marked in the latter analysis. The discrepancy attributes to the difference of the sampling time between both analyses because significant change of air mass route occurred during the bulk sampling after completion of the single particle sampling. 相似文献