Synthesis of Succinylated Starches and Their Application as Adsorbents for the Removal of Phenol

Journal of Polymers and the Environment - Succinylated starches (SS) were prepared by the reaction of normal starch (NS) and porous starch (PS) with succinic anhydride (SA) in the presence of DMF...     

A framework for investigating illegal wildlife trade on social media with machine learning

Article impact statement: Machine learning can be used to automatically monitor and assess illegal wildlife trade on social media platforms.     

Observation of volatile and semi-volatile carbonyls in an Algerian urban environment using dinitrophenylhydrazine/silica-HPLC and pentafluorophenylhydrazine/silica-GC-MS

Lower carbonyls and n-alkanals from C5 to C10 were measured from late autumn 2000 to summer 2001 in two urban areas in the Algerian territory: Algiers and Ouargla. They were collected on silica cartridges coated with dinitrophenylhydrazine (DNPH) and pentafluorophenylhydrazine (PFPH), which were analysed by HPLC-UV and high-resolution GC-MS. respectively. The two methods were used in parallel samplings in a suburban Algiers site and provided consistent results for semi-volatile congeners, as differences in the concentration data did not exceed 21% on average for individual carbonyl levels ranging from 0.0 to 0.5-2.6 microg m(-3). Concentrations of formaldehyde up to 27 and 5 microg m(-3) were monitored during 10 h samplings in the daytime in Algiers and Ouargla, respectively; acetaldehyde reached values of 13 and 5 microg m(-3), whilst acetone was the most abundant ketone with peak levels of 14 and 4 microg m(-3), respectively. High night-time levels of lower carbonyls were also measured at both locations. Among the semi-volatile alkanals, the highest levels were observed in suburban Algiers for hexanal and nonanal (2.2 microg m(-3)) and in downtown Algiers for valeraldehyde (2.6 microg m(-3)), whilst in Ouargla only hexanal and nonanal levels within the C5-C10 fraction exceeded 1 microg m(-3). Moreover, benzaldehyde concentrations as high as 5 microg m(-3) were measured in the centre of Algiers. Algiers data are comparable with those found in photochemically polluted urban areas of Europe and the USA. Strong correlations between formaldehyde and acetaldehyde and between formaldehyde and benzaldehyde were observed; by contrast, acetone did not show any correlation with the lower aldehydes, suggesting the existence of carbonyl sources other than vehicular traffic. Diurnal variations of almost all carbonyls suggested that motor vehicles were the most important source in the winter, whereas photochemical production appeared to predominate during the summer.     

地表变形预测分析--发电厂典型例子研究

通过对地表变形观测数据的分析、拟合及训练,采用人工神经网络方法和数理方法对地表变形的规律及发展趋势进行预测,并与观测数据进行对比分析,得到了较好的结果,为控制地表变形的发展及工程处理提供了可靠依据.     

Conifer needles as passive biomonitors of the spatial and temporal distribution of DDT from a point source

Needles of two conifer species, Picea abies and Pinus nigra, were used as passive samplers for monitoring air contamination by sampling at increasing distances from a suspected point source of DDT. Needle concentrations declined with increasing distance downwind of the point source allowing to identify spatial and temporal trends of accumulation. This suggested that conifer needles are effective biomonitors of contamination levels in areas characterized by the presence of semi-volatile substances. Differences in uptake were apparent between the species. Needle morphology and structure were studied with scanning electron microscope (SEM) as were dimensional parameters (surface area, volume). The results suggest that the concentrations depend on a mechanism involving the inner structure of the needles, specifically the number and accessibility of resin channels rather than their surface area. Pine needles have more channels with greater accessibility than spruce. The results suggest that spruce is more suitable for short term measurement while pine for determining long term cumulative exposure.     

论环境侵权构成要件的若干问题

传统法学理论一般认为环境侵权构成要件包括：行为的违法性、损害事实和因果关系。在“行为的违法性”这一点上目前有不同的认识,但分歧主要发生在对“违法”这一概念内涵的不同理解上,外延判断上并无本质区别。本文将损害事实分为环境污染和致人损害两个阶段,违法行为只要已经造成环境污染,即使尚未致人损害,无论从法学的角度还是经济学的角度出发,都应认为构成环境侵权。     

动态臭氧/紫外线法处理磺基水杨酸废水

研究了在有或无紫外线 (UV)照射的条件下臭氧 (O3 )对磺基水杨酸废水的处理效果。用O3 与UV协同处理磺基水杨酸废水比仅用O3 和仅用UV的处理效果好得多 ,其COD去除率大于后二者的COD去除率之和。试验选用的动态O3 /UV法处理磺基水杨酸废水的工艺条件为 :O3 发生器放电功率 90 %× 180W ,UV功率 14W ,废水循环流速 10 0mL/min ,处理时间 90min。在此条件下 ,废水COD去除率可达 80 %左右。在上述的O3 发生器放电功率、UV功率、废水循环流速条件下 ,处理 1min时废水变澄清     

高校宿舍火灾评估体系构建

本文基于灾害系统理论,并结合高校校园人口密度大等实际问题,从火灾孕灾环境、火灾承灾体、火灾致灾因子、火灾灾情四个方面构建出基于高校宿舍的火灾评估体系.最终补充了灾害系统理论,为高校防火工作提供了新的方法,也为其他相关工作拓展了思路.     

Environmental distribution of uranium and other trace elements at selected Kosovo sites

This paper reports the results of a study using lichens as biomonitors to investigate the environmental distribution of uranium and other trace elements at selected Kosovo sites. The results suggested that the use of depleted uranium (DU) ammunitions in Kosovo did not cause a diffuse environmental contamination in such a way to have caused a detectable U enrichment in lichens. Also isotopic (235)U/(238)U measurements did not indicate the presence of DU particles in lichens. The present results also provided no indication of intense environmental contamination by the other trace elements analyzed, with the exception of Kosovska Mitrovica, where a diffuse environmental contamination by several heavy elements such as Pb, Zn, As and Cd was found.