基于情景要素的电网大面积停电事件情景序列构建方法研究

为了进一步做好电网大面积停电事件应对工作,针对电网大面积停电事件外部致因条件与事件内部演化规律不清的问题,采用“情景-构建”方法梳理事件情景要素,并在历史事故案例数据以及大量应急演练数据的基础上,综合运用数据挖掘方法,建立相关事件情景的逻辑与时间序列,为电网大面积停电事件的应急响应与决策指挥等工作提供科学、合理的理论支持,相关研究思路与方法也可为电力企业其它类型突发事件的应急管理工作提供参考。     

六种重金属对大肠杆菌体内质粒DNA一级结构的影响

将质粒ｐＢＲ３２２、ｃ－Ｍｙｃ、ｐＣ５３－ＳＮ_３、ｐＴＢ２９转入大肠杆菌（Ｅｓｃｈｅｒｉｃｈｉａｃｏｌｉ）ＨＢ１０１中使其各自分别在含亚致死浓度Ｐｂ²⁺、Ｃｄ^2-、Ｚｎ²⁺、Ｃｕ²⁺、Ｍｎ²⁺、Ｈｇ²⁺的液体氨苄ＬＢ培养基中,振荡培养２４ｈ后,再将这些质粒抽提出来,通过限制性内切酶分析,研究了这些重金属离子对大肠杆菌体内质粒ＤＮＡ分子一级结构的影响。结果表明,在供试的６种重金属离子中只有Ｈｇ^２＋处理可明显导致质粒ＤＮＡ序列的改变。此外,供试６种重金属离子连续处理２４ｈ未发现可明显导致大肠杆菌体内质粒ＤＮＡ链的随机断裂。     

大连港专用矿石码头污水处理工程设计

采用沉砂、序批调节沉淀及浅层介质过滤的物化组合方式处理大连港专用矿石码头洗矿污水,介绍了各处理构筑物、运行参数.运行结果表明,用该法处理洗矿污水,其出水水质可达<生活杂用水水质标准>(CJ25.1-89)中绿化用水标准(其中悬浮物不大于10 mg/L).     

高压输电线路并列架设空间工频电场研究

利用等效电荷法计算多线路并列架设空间工频电场。结果表明,并列架设输电线路之间的工频电场会出现不同程度的叠加或削减,进而影响线路下方工频电场的强度和变化趋势。提出了多线路并列架设的线路空间布置建议,为输电线路环境影响评价模拟类比线路选取提供参考。     

Fe(II)EDTA/H_2O_2电催化降解甲基橙模拟废水的研究

在无隔膜电解槽中,采用SPR(Ru-Ir-TiO_2)为阳极,石墨为阴极,考察了Fe(II)EDTA/H_2O_2电催化降解甲基橙(methyl orange)模拟废水的影响,发现EDTA很大程度上促进了类电Fenton试剂对甲基橙模拟废水的降解.实验研究表明,在外加电压为5.0v,EDTA:Fe~(2+) =2:1(摩尔比,Fe~(2+) =40 mmol/L),H_2O_2=48 mmol/L,电解质Na_2SO_4=40 mmol/L,废水pH值为(6.5±0.1)的条件下,降解260 mg/L的甲基橙模拟废水90 min,EDTA的加入可以使甲基橙模拟废水的脱色率由29.5%上升到78.4%,COD由571.429 mg/L降至80 mg/L,COD的降解率为86%,EDTA在此过程中既是催化剂又是反应物,可有效避免EDTA带来二次环境污染的可能性.     

Metabolic fate of the 14C-labeled herbicide clodinafop-propargyl in a sediment–water system

The metabolic fate of ¹⁴C-phenyl-labeled herbicide clodinafop-propargyl (¹⁴C-CfP) was studied for 28 days in lab assays using a sediment–water system derived from a German location. Mineralization was 5.21% of applied ¹⁴C after 28 days exhibiting a distinct lag phase until day 14 of incubation. Portions of radioactivity remaining in water phases decreased at moderate rate to 18.48% after 28 days; 62.46% were still detected in water after 14 days. Soxhlet extraction of the sediment using acetonitrile released 35.56% of applied ¹⁴C with day 28, while 33.99% remained as non-extractable residues. A remarkable increase of bound ¹⁴C was observed between 14 and 28 days correlating with the distinct increase of mineralization. No correlation was found throughout incubation with microbial activity of the sediment as determined by dimethyl sulfoxide reduction. Dissolved oxygen and pH value of water phases remained almost constant for 28 days. Analyses of Soxhlet extracts of the sediment and ethyl acetate extracts of water phases by radio-TLC and radio-HPLC revealed that CfP was rapidly cleaved to free acid clodinafop (Cf), which was further (bio-) transformed. DT₅₀ values (based on radio-HPLC) were below 1 day (CfP) and slightly above 28 days (Cf). Further metabolites were not detected. Fractionation of humic and non-humic components of the sediment demonstrated that CfP's non-extractable residues were predominantly associated with fulvic acids up to 14 days of incubation (3.36%), whereas after 28 days, the majority of radioactivity was found in the humin/mineral fraction (13.30% of applied ¹⁴C). Due to high-performance size-exclusion chromatography of the fulvic acids fraction derived from assays incubated for 28 days, this portion of ¹⁴C was firmly, possibly covalently bound to fulvic acids and did not consist of CfP or Cf. Using an isolation strategy comprising preincubation of sediment with CfP and mineralization of ¹⁴C-CfP as criterion, a microorganism was isolated from the sediment examined. It grew on ¹⁴C-CfP as sole carbon source with evolution of ¹⁴CO₂. The bacterium was characterized by growth on commonly used carbon sources and 16S rDNA sequence analysis. Its sequence exhibited high similarity with that of Nocardioides aromaticivorans strain H-1 (98.85%; DSM 15131, JCM 11674).     

新疆昭苏黄土剖面色度变化特征及古气候意义

对受西风影响的伊犁盆地南缘的昭苏波马剖面进行色度指标分析后发现,在黄土堆积期间,亮度L^*在很大程度上受控于颜色分量a^*、b^*,同有机质含量关系密切。在S_* 中亮度L^* 与碳酸钙有较好的相关性,而在L_*中相关性极低。红度a^*受赤铁矿含量的影响最大,其较好的 正相关关系可以很好地反映气候变干的过程。而黄度b^*与针铁矿相关性较差,易受到多方面因 素的影响,对气候转变的敏感性不高。