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941.
CPC/CaO_2氧缓释复合材料的制备及其释氧性能探讨 总被引:4,自引:1,他引:3
利用过氧化钙(CaO2)遇水释放氧气的特性,采用混合法将CaO2载入到磷酸钙骨水泥(CPC)中,并通过挤出-滚圆造粒方法制备出CPC/CaO2氧缓释复合材料,旨在为污染地下水的好氧生物修复技术提供一种长期、高效的供氧源。由X射线衍射(XRD)分析可知,通过固相反应制取的CPC主要成分为Ca5(PO4)3(OH)和Ca10(PO4)6(OH)2,具有较快的固化时间和固化效果;CPC/CaO2氧缓释复合材料分3个阶段进行释氧,其中2、3阶段分别符合一级和零级释氧动力学特征,且其释氧速率和释氧周期得到明显改善。本研究成果可用于实际地下水修复工程,解决污染地下水原位生物修复过程中溶解氧(DO)的输送问题。 相似文献
942.
943.
Uptake of uranium and thorium by native and cultivated plants 总被引:2,自引:0,他引:2
Shtangeeva I 《Journal of environmental radioactivity》2010,101(6):458-6946
Large part of available literature on biogeochemistry of uranium and thorium refers to the studies performed either in highly contaminated areas or in nutrient solutions that have been artificially ‘spiked’ with radionuclides. Effects of background levels of natural radioactivity on soil-grown plants have not been studied to the same extent. In this paper, we summarised results of greenhouse and field experiments performed by the author from 2000 to 2006. We examined some of the factors affecting transfer of U and Th from soil to plants, differences in uptake of these radionuclides by different plants, relationships between U and Th in soil and in plants, and temporal variations of U and Th in different plant species. Concentrations of radionuclides (critical point for experimental studies on biogeochemistry of U and Th - rare trace elements in non-contaminated regions) and essential plant nutrients and trace elements were determined by instrumental neutron activation analysis. 相似文献
944.
Introduction
This article examines the extent to which investing in safety during the creation of a new chemical installation proves profitable.Method
The authors propose a management supporting cost-benefit model that identifies and evaluates investments in safety within a chemical company. This innovative model differentiates between serious accidents and less serious accidents, thus providing an authentic image of prevention-related costs and benefits. In classic cost-benefit analyses, which do not make such differentiations, only a rudimentary image of potential profitability resulting from investments in safety is obtained.Results
The resulting management conclusions that can be drawn from such classical analyses are of a very limited nature. The proposed model, however, is applied to a real case study and the proposed investments in safety at an appointed chemical installation are weighed against the estimated hypothetical benefits resulting from the preventive measures to be installed at the installation.Conclusion
In the case-study carried out in question, it would appear that the proposed prevention investments are justified.Impact on industry
Such an economic exercise may be very important to chemical corporations trying to (further) improve their safety investments. 相似文献945.
钢筋混凝土矩形梁在实际火灾下正截面承载力数值计算 总被引:1,自引:1,他引:0
为了正确评估钢筋混凝土矩形梁在实际火灾条件下的承载力,以一般室内火灾轰燃后的房间平均温度-时间曲线为火作用,以建筑结构耐火理论为基础,采用数值计算方法研究钢筋混凝土矩形梁的正截面承载力.研究结果表明:梁的承载力随火灾房间温度升高而变小,在温度达到最大值后承载力达到最小值.火灾房间火灾荷载越大,开口因子越小,火作用越大,梁的最小承载力越小;反之相反.相同条件下梁支座截面的承载力要大于跨中截面. 相似文献
946.
Yu-Chi Weng Takeshi Fujiwara Yuzuru Matsuoka 《Journal of Material Cycles and Waste Management》2009,11(2):110-122
Industrialization and urbanization result in significant changes in lifestyle. These lifestyle changes seem to lead to unsustainable
consumption patterns and increase the generation of various kinds of environmental loads, especially the amount of municipal
solid waste (MSW). Taiwan is a small island with scarce natural resources. The economic development in Taiwan has resulted
in the generation of large amounts of MSW. As a result, the Taiwan Environmental Pollution Administration (TEPA) has produced
regulations for waste minimization and has imposed several important policy measures that have successfully reduced the MSW
discard rate in recent years and have established a public recycling network as a part of the MSW collection. Nowadays, the
objective of the MSW policies in Taiwan is to develop a “zero-waste society.” This article aims to review the MSW management
progress in Taiwan and to project future MSW discards up to 2011 based on the national plan and assumed scenarios for socioeconomic
variables. According to the analysis results, a more sustainable consumption pattern can be proposed and the corresponding
MSW management system can be planned so as to develop a low-waste-discard society. 相似文献
947.
948.
采用Borland C++builder6.0开发工具,以英国标准BS7910剩余强度评价规范为蓝本,并结合实际应用特点,提出动态数据源组件(ADO)技术在该案例的应用,开发适用于以平面型缺陷为主的剩余强度安全评价系统。解决在役长输管道剩余强度安全评定系统中复杂数据的科学转换,实现软件接口的高效、通用性数据访问。根据评定结果与实际实验数据对比表明,该应用与实际误差达到工程检测设计标准。 相似文献
949.
新疆艾比湖流域平原区景观土壤属性特征研究 总被引:1,自引:0,他引:1
以新疆艾比湖流域平原区为对象,在对研究区进行景观生态分类及野外调查验证的基础上,利用"3S"技术将1∶100×104的新疆土壤类型图与研究区景观类型图叠加,从土壤属性层次上对研究区各类景观的生态土壤类型进行确认,并分析其在研究区内分布的特征。结果表明:研究区主要土壤类型为26类,以石膏灰棕漠土所占比例最大,占研究区总面积的19.03%,棕钙土、荒漠风沙土、草甸盐土、盐化草甸土、和灌耕灰漠土等面积也较大。 相似文献
950.