儿童在道路行驶中的安全与防护——加拿大新的儿童汽车座椅法规与测试方法

本文主要介绍加拿大新的《机动车辆约束系统和加高座椅安全法规》（SOR/2011-16）的相关内容,同时对儿童汽车座椅的研究与测试方法也进行了详细描述,以对我国相关行业提供借鉴。     

Experimental study on pollutant movement in surf zone

The experiments on pollutant movement in surf zone were conducted on the two gentle beaches(with slope of 1:100 and 1:40, respectively), for diverse wave cases. The movement contours and direction of pollutants, under the action of regular and random waves with diverse wave amplitudes, were provided and studied in this paper. It was shown that, due to complicated hydrodynamics in surf zone, the pollutant movement state is quite complicated and different from that in pure current zone.     

Occurrence and volatility of several trace elements in pulverized coal boiler

The contents of eight trace elements(Mn, Cr, Pb, As, Se, Zn, Cd, Hg) in raw coal, bottom ash and fly ash were measured in a 220 t/h pulverized coal boiler. Factors affecting distribution of trace elements were investigated, including fly ash diameter, furnace temperature, oxygen content and trace elements‘ characters. One coefficient of Meij was also improved to more directly show element enrichment in combustion products. These elements may be classified into three groups according to their distribution: Group 1. Hg, which is very volatile. Group 2: Pb, Zn, Cd, which are partially volatile. Group 3: Mn, which is hardly volatile. Se may be located between groups 1 and 2. Cr has properties of both group ! and 3. In addition, the smaller diameter of fly ash, the more relative enrichment of trace elements (except Mn). The fly ash showed different adsorption mechanisms of trace elements and the volatilization of trace elements rises with furnace temperature. Relative enrichments of trace elements(except Mn and Cr) in fly ash are larger than that in bottom ash. Low oxygen content can not always improve the volatilization of trace elements. Pb is easier to form chloride than Cd during coal combustion. Trace elements should be classified in accordance with factors.     

Physicochemical interaction and its influence on deep bed filtration process

The capillary model was used to analyze the hydraulic conditions in the deep bed filtration process. The physicochemical interaction forces between the filter media and suspended particles and their influence on deep bed filtration process were also studied theoretically. Through the comparison of the hydraulic and physicochemical forces, the key influencing factors on the filtration process were proposed and investigated. Pilot study of the microflocculation deep bed filtration was carried out in the No. 9 Potable Water Treatment Plant of Beijing, and the experimental results of hydraulic head loss, particle distribution and entrapment were presented. The theoretical prediction was reasonably consistent with the experimental results under different conditions, which indicated that the regulation and control of micro-flocculation and deep bed filtration could be realized by the evaluation of the physicochemical interactions. Further theoretical and experimental research should be carried out to investigate the interaction mechanism and its application in the deep bed filtration and other cases.     

Kinetics study of aqueous sorption of phenanthrene to humic acids and sediments

IntroductionThesorptionofhydrophobicorganiccontaminants(HOCs)onnaturalgeosorbentsplaysasignificantroleintheirtransport,degradationandultimatefateintheaquaticenvironment (Alexander,1995 ;Luthy ,1997;Weber,2 0 0 1) .Sincethelate 1970s,theorganicmatter(OM)ha…     

Multilevel air quality evolution in Shenyang: Impact of elevated point emission reduction

Visibility observed at different altitudes is favorable to understand the causes of air pollution. We conducted 4-years of observations of visibility at 2.8 and 60 m and particulate matter(PM) concentrations from 2015 to 2018 in Shenyang, a provincial city in Northeast China. The results indicated that visibility increased with the increasing height in winter(especially at night), and decreased with height in summer(especially at the daytime). PM concentration exhibited opposite vertical variati...     

Combined application of chemical fertilizer with green manure increased the stabilization of organic carbon in the organo-mineral complexes of paddy soil

Environmental Science and Pollution Research - The influence of the combined application of chemical fertilizer with green manure on the stabilization of organic carbon (C) was explored in the...     

Enhanced non-radical activation of persulfate with pompon-like NiO microspheres for removing sulfamethoxazole in water

Environmental Science and Pollution Research - The development of efficient heterogeneous catalyst for non-radical activation of persulfate (PS) is highly desired for removing organic pollutants in...     

生态足迹方法在县级城市的运用--以成都市龙泉驿区为例

本文以成都市1999年和2003年统计年鉴和龙泉驿区统计年鉴1998年和2003年的数据为依据,采用生态足迹的方法,对龙泉驿区1998年和2003年的可持续发展性进行定量评价,通过计算和分析,结果表明龙泉驿区1998年和2003年人均生态足迹均为赤字,且2003年比1998年的生态足迹赤字更为加剧,这反映出人类的生产、生活强度超过了生态系统的承载能力,此区域生态系统处于过度开发利用和压力之下,随着经济的发展,人口的增加,这种趋势还在继续加大.     

特大型城市城区─上海闵行区循环经济建设探讨

以上海市闵行区为例,通过对传统型经济发展模式所面临问题的分析,阐述了闵行区发展循环经济的重要意义。分析了闵行区发展循环经济的优劣势,提出闵行区发展循环经济的初步设想,为创建循环经济示范城区提供初始框架和现阶段工作重点。