Exposure characteristics of phthalate metabolites among the Zunyi cohort of pregnant women in Southwest China

Environmental Science and Pollution Research - Reported evidence has increasingly indicated that exposure to phthalates can cause adverse pregnancy outcomes. However, phthalate exposure levels...     

Main and added effects of heatwaves on hospitalizations for mental and behavioral disorders in a tropical megacity of Vietnam

Environmental Science and Pollution Research - Vietnam is highly vulnerable to climate change-related extreme weather events such as heatwaves. This study assesses the association between heatwaves...     

Acute and chronic toxicities of prothioconazole and its metabolite prothioconazole-desthio in Daphnia magna

Environmental Science and Pollution Research - Current research on prothioconazole (PTC), a broad-spectrum triazole fungicide, mainly focuses on its efficacy and residues; only a few studies have...     

Exposure to phthalates in early pregnancy and the risk of fetal growth restriction: a nested case–control study in a Zhuang Chinese population

Environmental Science and Pollution Research - Phthalates (PAEs) are common endocrine disrupting chemicals (EDCs) that disrupt fetal development. The present study aimed to evaluate the effects of...     

南充生态经济系统的能值分析与可持续发展研究

本文利用美国生态学家H．T.Odum的能值分析理论和方法对南充生态经济系统的能量流动进行定量的分析。简要介绍了南充自然、社会、经济等方面的概况，结合南充的基础数据，应用能值理论计算出1994～2003年南充生态经济系统的能值评估表及能值指标趋势分析。在计算南充的人均能值使用量（EPC），电力占有率（FEE），环境负荷率（ELR），能值投入率（EIR），净能值产出率（EYR），能值货币比率（EDR），能值使用强度（ED），人口承载力（PCC），废物能值比率（WER），能值自给率（ES），可持续发展指数（ESI）基础上，运用南充的各项指标与其它国家和地区进行了横向和纵向的分析。结果表明：南充的生态经济系统是比较脆弱的，从发展过程来看还没有进入工业积累阶段，仍然属于农业大市。所以加强第二、第三产业的发展是南充经济发展的重要出路。     

Similarities and differences in adsorption mechanism of dichlorvos and pymetrozine insecticides with coconut fiber biowaste sorbent

Abstract

In this study, the similarities and differences of the adsorption mechanisms between dichlorvos and pymetrozine and coconut fiber biowaste sorbent (CF-BWS) were investigated. CF-BWS was produced using the slow pyrolysis process at 600?°C for 4?h. HCl acid modification was used to improve the specific surface area. The properties of CF-BWS were analyzed by SEM, FT-IR, BET, and pHpzc. The adsorption kinetics of dichlorvos and pymetrozine on the CF-BWS were well explained by the pseudo-second-order model. The adsorption isotherms for both insecticides were followed the Langmuir isotherm. The difference in molecular structures and surface chemistry caused the difference in adsorption mechanisms of both insecticides. The pore-filling and the hydrophobic interactions were the key mechanisms for both insecticide adsorptions. However, the π–π electron donor–acceptor interaction played the major role in the pymetrozine adsorption but hardly impacted on the adsorption of dichlorvos. The hydrogen bonding mechanism was pronounced in the pymetrozine adsorption, but it had little influence on the dichlorvos adsorption. The CF-BWS is exhibited as an excellent material for the removal of both pollutants and has high potential to be used further as the adsorbent in water treatment process.     

武汉市耕地资源非农化过程的时空变化特征分析

耕地非农化现象是实现工业化和城市化所必须付出的一种代价，已经成为经济发展和城市化，工业化进程中的一个普遍现象。根据武汉市1988-2002年来耕地资源变化的详查数据资料，分析其耕地资源非农化过程的时空变化特征。结果表明：①1988-2002年武市非农建设用地扩张占用耕地面积16394.57hm^2，占耕地资源减少面积的48.75%,耕地非农化成为耕地资源减少的一个重要的原因。②近年来城市非农建设基本上是占用质量较好的耕地，以灌溉水田和菜地为主。③随着城市化进程的加快，耕地非农化的速度在加快。④耕地非农化的区域差异明显，主要集中颁在城市主城区的新区及城郊区。⑤耕地非农人的区域指向性变化明显，主城区扩展的建设用地主要以城市、建制镇、村庄等居民点用地为主，城郊区以交通用地及工矿用地为主。     

以科技创新确保安全生产--神华集团神东煤炭公司安全生产纪实

公司概况神华集团是1995年组建的国有独资公司,中央直接管理的44户国有重要骨干企业之一,一个以能源、交通为主,实行矿、电、路、港一体化建设和产运销一条龙经营的企业集团。神东煤炭公司是神华集团的全资子公司。神东煤炭公司于1998年     

应急管理的机理体系

1 应急管理的主体与客体 　　突发事件应急管理是管理主体对突发事件的介入和应对行动.因此,我们首先需要对应急管理中的突发事件和管理者这两个因素进行全面的研究分析,把它作为研究突发事件应急管理的起点,从而明确突发事件的发生、发展及演化等机理,并根据事件机理和环境来确定应急处置重点.……