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161.
参照国家环保局颁发的《环境天然放射性水平调查规定》,在厦门市区开展了放射性污染源调查,对厦门市放射性污染源现状进行了分析和研究,对各类放射性污染源的环境影响作出评估,对放射性污染的发展趋势进行了预测,为厦门市放射性环境管理提供了重要的资料。 相似文献
162.
Fox P 《Environmental monitoring and assessment》2001,70(1-2):117-133
Monitoring groundwaters under the influence of reclaimedwater must consider the major constituents of concern inreclaimed water. This research focused on the fate ofdissolved organic carbon and nitrogen species at field siteslocated throughout the Southwestern United States. Awatershed approach was developed to predict the fate ofdissolved organic carbon as a function of the drinking waterdissolved organic carbon concentration and the totaldissolved solids concentration in the reclaimed water. Extensive characterization of the dissolved organic carbonrecovered from groundwaters under the influence of reclaimedwater was done. With the exception of fluorescencespectroscopy, the dissolved organic carbon present ineffluent organic matter was similar in structure, characterand reactivity as compared to natural organic matter. Evidence for sustainable nitrogen removal mechanisms duringgroundwater recharge with reclaimed water was obtained. Theautotrophic reaction between ammonia and nitrate appears to amechanism for the removal nitrogen in a carbon-depletedenvironment. The monitoring tools and methodologiesdeveloped in this research can be used to assure protectionof public health and determine the sustainability of indirectpotable reuse projects. 相似文献
164.
超临界水氧化处理含油废水的实验研究 总被引:12,自引:1,他引:11
在间歇式超临界水氧化反应装置上进行含油废水的超临界水氧化实验研究,反应温度390~430℃、压力24~28MPa、反应时间30~90s。研究表明:超临界水氧化法是一种高效、快速的有机废弃物处理技术;随反应时间增加、温度升高,废水COD去除率显著增大;以幂函数方程描述了氧化剂过量时含油废水超临界水氧化的反应动力学规律,氧化反应对废水的反应级数为1级,在26MPa时,反应活化能和频率因子分别为(5896.83±243.68)J/mol和(0.0652±0.0028)s-1,模型计算值与实验值的误差为±13%。 相似文献
165.
中国环境内分泌干扰物的污染现状分析 总被引:7,自引:2,他引:5
内分泌干扰物严重威胁着全球环境和生态健康,基于人为源内分泌干扰物的分类,分析了国内内分泌干扰物的污染现状,指出了目前研究工作的局限,提出了今后研究重点及污染控制的建议。 相似文献
166.
167.
Mervyn Edwards Alix Edwards Josh Appleby Dean Beaumont 《Traffic injury prevention》2019,20(4):S71-S77
AbstractObjective: Although bus travel is one of the safest modes of transport, a substantial number of bus passengers in London are still injured in collision and harsh maneuver incidents, in particular emergency braking. It is not well understood how these passengers are injured. The objective was to better understand the injury mechanisms and develop countermeasures with a test and assessment procedure to prevent or mitigate these injuries.Methods: The UK national STATS19 data were used to determine the size of the problem. Data, including CCTV footage, in combination with inspection of current buses, were used to determine injury mechanisms and identify features and areas in buses associated with more injuries.An assessment system based on visual inspection was developed to encourage a reduction in the number of features associated with injury.Results: The STATS19 analysis showed that three quarters of all injured casualties occurred in incidents where there was no impact, with this proportion rising for seriously injured casualties. Overrepresentation of older females was also seen.The CCTV analysis and bus examinations highlighted issues with poorly positioned handrails, lack of compartmentalization (restraint), and objects with sharp edges and corners. It also showed that a much higher proportion of passengers seated in the area close to the middle doors and wheelchair area were injured compared to other areas of the bus. Factors contributing to this result were that this area contained more features associated with injury and that persons with reduced mobility have greater exposure in this area; that is, more vulnerable passengers currently sit in the less safe areas of the bus.Conclusions: A novel analysis of CCTV footage has enabled a better understanding of injury mechanisms for bus passengers to be developed. In combination with inspection of current buses, this has been used to develop an assessment system to improve the safety of buses in London. 相似文献
168.
Mengtian Li Ge Song Ruiping Liu Xia Huang Huijuan Liu 《Frontiers of Environmental Science & Engineering》2022,16(6):70
169.
以含锌废盐酸为原料制备磷酸锌[Zn3(PO4)2],探讨含锌废盐酸中Zn、Fe、Cr、Ni等重金属质量分数、TOC质量浓度、磷酸体积分数和反应时间等典型因素对Zn3(PO4)2纯度及化学组成结构的影响,并用XRD及SEM表征Zn3(PO4)2的物相结构。结果表明,含锌废盐酸可制备纯度较高、结构较为稳定的Zn3(PO4)2产品,制备过程中废盐酸中的Fe对Zn3(PO4)2产出纯度的影响较大;Zn3(PO4)2的产出纯度随TOC质量浓度的升高而下降;当磷酸体积分数低于85%时,对Zn3(PO4)2产出纯度总体呈正相关趋势,而高于85%后,产出纯度则有所降低;反应时间为5 h时制备Zn3(PO4)2的效率最高。 相似文献
170.
Lindenmann HP 《Journal of Safety Research》2006,37(4):395-400
INTRODUCTION: The significance of the influence of poor pavement skid resistance values on accident frequency in wet pavement conditions has been the object of many studies over several years. The various investigations have produced very diverse findings. Only seldom, however, has detailed consideration been given to the central question of whether pavement skid resistance is a decisive parameter in the occurrence of local accident "black spots." Until now, the focus has been more on describing a relationship between pavement skid resistance and accident frequency. METHOD AND RESULTS: In the course of the network-wide survey of the states of pavements and of accident occurrence on Switzerland's freeways from 1999 to 2003, it emerged that a relationship with inadequate pavement skid resistance was provable for only a small proportion of accident black spots. These findings were used to frame a guideline for authorities and highway operators about how to treat skid resistance when assessing pavements and accident occurrence on freeways. 相似文献