Lipid peroxidation and antioxidant status in workers exposed to PCDD/Fs of metal recovery plants

Secondary copper smelters, which primarily utilize the waste materials that contain organic impurities, and the zinc recovery plant, which handles mostly fly ash and slag from the iron and steel industry, are major emission sources of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) in Taiwan. In this study, we compared the levels of erythrocyte glutathione (GSH), erythrocyte superoxide dismutase (SOD) and plasma malondialdehyde (MDA) in workers at a secondary copper smelting plant and a zinc recovery plant who may have been exposed to PCDD/Fs. Though the PCDD/F levels were higher in workers of zinc recovery plant than those of secondary copper smelting plant, no significant difference was found for serum PCDD/F levels between the two kinds of plants. We observed a significant difference in plasma MDA levels between workers at the zinc recovery plant (2.54 microM) and those at the copper smelting plant (1.79 microM). There was and a significant positive correlation between plasma MDA levels and the PCDD/Fs levels. In addition, we observed that the MDA levels were not affected by smoking and exercise status. Therefore, the data suggest that the MDA levels of the metal recovery workers are influenced by their PCDD/F exposure. The erythrocyte SOD activity in workers from the zinc recovery plant was marginally higher than that from the secondary copper plant (196 vs. 146 units/ml, p<0.06). In both plants, large variations in the MDA and SOD levels were found, especially in the high-PCDD/Fs-exposure group, which may be attributed, at least partially, to the differences in smoking status and the number of cigarettes smoked. Overall, our results indicate a higher oxidative stress in workers of the zinc recovery plant than in workers of the secondary copper smelting plant in Taiwan.     

旧工业建筑再生利用项目可持续后评价研究

旧工业建筑再生利用项目同其它建设项目一样,在后评价时同样要进行可持续性评价。根据旧工业建筑再生利用项目后评价的内容和特点构建了可持续性后评价的指标体系,分析了经济、社会、科技、环境及资源等多方面内容,并结合实例,运用综合评价法(模糊识别法与层次分析法相结合)计算厂房改造项目可持续性后评价的特征值,对项目的可持续能力进行了分析。     

气相色谱法同时测定水中多种有机氯农药和多氯联苯

建立了一种同时测定水中16种有机氯农药(OCPs)和8种多氯联苯(PCBs)的气相色谱/电子捕获分析方法。样品经正己烷液液萃取、氮吹浓缩后,以自动不分流进样方式用气相色谱/电子捕获器检测,并对色谱条件进行优化,采用外标法定量。在较佳的试验条件下,16种OCPs和8种PCBs标准曲线的线性相关系数为0.999 0～0.999 9,方法检出限为0.001～0.002μg/L,OCPs和PCBs的平均加标回收率分别在(88.1%～107.0%)、(91.8%～104.2%)之间,相对标准偏差(RSD,n=5)分别为(2.87%～10.42%)、(3.96%～9.02%)。该方法灵敏、准确、稳定,分析时间短,适用于大批量水样中痕量有机氯农药和多氯联苯的测定。     

天津城市规划低碳评估指标体系研究

低碳概念是在应对全球气候变化、减少温室气体排放的背景下提出的。天津作为全国低碳建设试点城市,探索符合市情和生态文明建设要求的发展道路成为目前城市规划和建设的重点任务之一。而科学的城市规划是建设低碳城市的第一步,需要尽快完善和提升规划编制技术手段和内容,建立规划低碳化评估体系和规划对策。本文从碳排放机制入手,研究城市规划中影响碳排放的关键因素,构建评价指标体系,定量化分析和预测规划的低碳化程度,揭示规划建设与低碳城市建设的耦合关系,同时开展规划策略研究,促进天津市城乡规划的低碳化、宜居化、生态化转型。     

Dechlorination pathways of diverse chlorinated aromatic pollutants conducted by Dehalococcoides sp. strain CBDB1

Dechlorination of chlorinated aromatic pollutants (CAPs) has become a major issue in recent decades. This paper reported a theoretical indicator for predicting the reductive dechlorination pathways of polychlorinated dibenzo-p-dioxins (PCDDs), chlorobenzenes and chlorophenols transformed by Dehalococcoides sp. strain CBDB1. Density functional theory (DFT) calculations were carried out at the B3LYP/6-31G(d) level for all related CAPs and Mulliken atomic charges on chlorine atoms (Q_Cl(n)) were adopted as the probe of the dechlorination reaction activity. Q_Cl(n) can consistently indicate the main dechlorination daughter products of PCDDs, chlorobenzenes and chlorophenols conducted by strain CBDB1. The dechlorination reaction favors elimination of the chlorine atoms having greater Q_Cl(n) values. The chlorine atom with the greatest Q_Cl(n) value tends preferentially to be eliminated, whereas the chlorine atom with the smallest Q_Cl(n) value tends unlikely to be eliminated or does not react at all. For a series of compounds having similar structure, the maximal Q_Cl(n) of each molecular can be used to predict the possibility of its daughter product(s). In addition, the difference (?Q_Cl(n)) between the maximal Q_Cl(n) and the next maximal Q_Cl(n) of the same molecule can be used to assess the possibility of formation of multiple dechlorination products.     

Jacknife and bootstrap estimation of biological index of water quality

Many biological indices of water quality are generally used with a very low number of field samples to estimate water conditions. This precludes the application of traditional statistical techniques in order to test for significant differences between values of the indices for different sampling stations. Two non-standard statistical methods now in common use, namely the jacknife and the bootstrap, could be proficiently applied to obtain a quantitative measure of the indicator power of biological indices. This methodology allows the detection of significant trends in water pollution or water improvement. Application of these methods is exemplified by the Pantle and Buck saprobity index of water quality.     

期刊收录系统评价指标与建筑类期刊的发展

期刊进入检索系统有利于期刊拓宽交流范围,提高知名度和学术地位,吸引作者,开拓优质稿源,期刊能否进入重要检索系统是评价该期刊学术质量与地位的重要指标。通过对建筑类期刊在《EI》和国内收录系统中所处现状的分析,提出该类期刊的发展对策。     

绿色住宅规划设计阶段评价指标权重分析——以江苏为例

以江苏省绿色建筑评价标准为依据,建立绿色住宅环境性能评价指标体系,采用ANP方法及模糊综合评判法计算指标权重,经比较分析得知,ANP方法适用于指标权重计算。     

电力部国家电网调度控制中心蓄冰空调系统设计

详细介绍了电力部国家电网控制中心工程的冰蓄冷空调系统设计，通过技术比较得出各项经济指标，认为蓄冰空调的发展有赖于国家电力政策的倾斜。     

基于多级模糊综合评价法的机电产品绿色度评估

针对目前尚无统一的机电产品绿色度评价标准,根据绿色机电产品的绿色特性,建立了机电产品绿色度评价指标体系,并分析了评价体系中的经济、能源、资源、环境等主要属性,提出了绿色度的模糊综合评价方法,给出了绿色度模糊综合评估实例,实现了机电产品绿色度评估的目标。实践证明,通过对产品绿色度评估,可以改进设计方案,提高绿色制造的能力。