PPARγ/UCP2在甲醛致学习记忆障碍中的作用

为探究过氧化物酶体增殖物激活受体γ/解偶联蛋白2（PPARγ/UCP2）在甲醛（FA）诱导的学习记忆障碍中的作用,本文将C57BL/6小鼠随机分为：对照组、T0070907组（抑制剂组）、3mg/m³ FA组、3mg/m³ FA+T0070907组,进行连续21d的实验暴露,在第22d取脑组织测定脑组织脏体比并匀浆,检测活性氧（ROS）、谷胱甘肽（GSH）、丙二醛（MDA）、核因子κB （NF-κB）、白细胞介素6（IL-6）、PPARγ、UCP2等生化指标,通过Nissl染色观察脑组织的病理学变化.结果发现,与对照组相比,T0070907组和3mg/m³ FA组小鼠大脑皮层神经元受损,GSH含量下降,ROS、MDA、NF-κB、IL-6含量有所上升,而3mg/m³ FA+T0070907组小鼠上述现象更严重.此外,与对照组相比,T0070907组小鼠脑组织中的PPARγ和UCP2含量下降,但3mg/m³ FA组小鼠脑组织中的PPARγ和UCP2含量上升;与3mg/m³ FA组相比,加入抑制剂的3mg/m³ FA+T0070907组小鼠脑组织中的PPARγ和UCP2含量下降.研究结果表明,在加入PPARγ抑制剂后,PPARγ/UCP2含量下降,加重了FA所致小鼠的学习记忆障碍,故PPARγ/UCP2在FA致学习记忆障碍中可能起保护作用.     

基于典型案例的流域规划环评管理成效评估

为提高流域规划环评的有效性,评估流域规划环评的管理成效并分析存在的问题和短板,在总结我国流域规划环评发展状况的基础上,收集并分析了2014～2019年经国家环保部门审查的25个涉及长江、黄河、珠江三大流域的典型案例,从改善环境质量、保障生态安全、维系生态功能和促进绿色发展等4个方面,选取16项评价指标分级打分,并通过MATLAB软件建立BP神经网络,提取各指标贡献度,分析流域规划环评成效和不足.结果显示,受评案例共优化水资源配置保障环境用水逾20亿m³,减少向主要河流排放污染物约20万t;降低流域开发规模调整规划水利工程方案223个,保留了411km天然河段;为保护野生动植物及其生境建议取消水电开发项目122个,避让了43个环境敏感区,但在推动绿色转型发展方面仍相对不足.建议围绕提高环评质量,加强环评成果落实,推动流域生态保护和高质量发展等方面,进一步完善流域规划环评管理.     

生物载体内孔径对生物膜微型动物多样性与稳定性影响

为了给废水处理生产中最佳孔径的生物载体选型提供依据,本研究系统考察聚氨酯海绵生物载体5种孔径（0.6~4mm）大小对生物膜微型动物群落多样性以及稳定性的影响.结果表明：鞭毛虫、肉足虫等是运行前期与中期的优势种属,游泳型与固着型纤毛虫、轮虫是后期的优势种属.不同孔径载体在不同时期,微型动物多样性、稳定性等参数变化具有明显差异.小孔径（0.6mm）载体微型动物仅在运行中期内表现出较高多样性,中小孔径（1mm）载体多样性总体偏低,中大孔径（3mm）和大孔径（4mm）载体微型动物多样性波动剧烈.小孔径、中小孔径载体内微型动物稳定性好,中大孔径载体稳定性波动大,而大孔径载体最不稳定.中等孔径（2mm）载体内微型动物群落物种丰富度、均匀度高,多样性高且稳定（后期H=2.12、R=1.19、λ=0.16）,其微型动物群落最为稳定（后期W_H=0.13）,且表现出较好的废水处理效果,中等孔径是理想的生物载体内部孔径大小.在生物膜系统中,微型动物多样性稳定指数W_H可作为废水中CODc_r去除效果的指标参数.     

局放检测技术在高压开关柜绝缘缺陷诊断与定位中的应用

针对石化企业电气设备绝缘状态检测现状,采用特高频检测、高频电流检测、超声波检测等常用局部放电检测方法,对某石化企业220 kV变电站35 kV开关柜局部放电检测,分析局部放电检测数据和图谱特征,综合运用高频电流检测和特高频检测实现绝缘缺陷类型的准确识别和故障的精确定位,为企业电气设备状态检修及维护提供了关键数据支持。     

固定顶储罐VOCs排放核算影响因素研究

根据《石化行业VOCs污染源排查工作指南》中固定顶储罐VOCs排放的核算公式,通过控制变量法,系统性地研究了储存温度、环境状况、罐漆颜色、储存物料、储存高度及周转量等因素对储罐排放的影响,在对主要影响因素进行分析的基础上,提出针对性的减排措施。     

Potential applications of porous organic polymers as adsorbent for the adsorption of volatile organic compounds

Volatile organic compounds (VOCs) with high toxicity and carcinogenicity are emitted from kinds of industries, which endanger human health and the environment. Adsorption is a promising method for the treatment of VOCs due to its low cost and high efficiency. In recent years, activated carbons, zeolites, and mesoporous materials are widely used to remove VOCs because of their high specific surface area and abundant porosity. However, the hydrophilic nature and low desorption rate of those materials limit their commercial application. Furthermore, the adsorption capacities of VOCs still need to be improved. Porous organic polymers (POPs) with extremely high porosity, structural diversity, and hydrophobic have been considered as one of the most promising candidates for VOCs adsorption. This review generalized the superiority of POPs for VOCs adsorption compared to other porous materials and summarized the studies of VOCs adsorption on different types of POPs. Moreover, the mechanism of competitive adsorption between water and VOCs on the POPs was discussed. Finally, a concise outlook for utilizing POPs for VOCs adsorption was discussed, noting areas in which further work is needed to develop the next-generation POPs for practical applications.     

Speciation characterization and coagulation of poly-silica-ferric-chloride：The role of hydrolyzed Fe（Ⅲ） and silica interaction

The highly e cient inorganic polymer flocculants (IPFs) of the ferric-silica system is a new and promising coagulant. Interactions between ferric species and silica play a large part in the coagulation of suspensions. These e ects are quite distinct from those associated with polymeric or colloid silica. However, although these species are key to coagulation e ciency, they have not been comprehensively discussed. A new type of coagulant, poly-silica-ferric-chloride (PFSC), was synthesized by co-polymerization and characterized by time complexation spectroscopy and photon correlation spectroscopy. Compared with traditional ferric salt, the results indicated that PFSC had a higher molecular weight, lesser positive charge, lower Feb and higher Fec. The higher the Si/Fe ratio, the higher the silica and lower the silicac found. The PFSC with appropriate polysilica acid not only obtained better coagulation/flocculation e ciency in turbidity removal, enhanced the flocculation index (FI) and provided less residual ferric, it also lowered water treatment costs compared to traditional ferric salt. Results showed that PFSC could remove colloid particles in water by charge neutralization and sweeping, adsorption bridging mechanism.     

Fabrication and characterization of lightweight aggregate prepared from steel mill sludge in one step

Journal of Material Cycles and Waste Management - The qualified green lightweight aggregate (LWA) was successfully prepared from steel mill sludge (SMS) and fly ash (FAS) in one step using the...     

我国海洋经济高质量发展指标体系构建及时空分析——基于海洋强国战略背景

通过对海洋强国战略背景下我国海洋经济高质量发展内涵的分析,构建评价指标体系,运用全局熵权法对2013—2019年沿海11省份指标数据进行研究。结果发现:①时间上,我国沿海省份海洋经济发展质量整体呈上升趋势,广东、上海稳定处于高水平梯度,河北、广西、海南持续处于低水平,辽宁、福建、天津略有变动。②空间上,从海洋经济平均发展质量看,长三角位列第一;但在增长率方面珠三角高于长三角,第三是环渤海海洋经济区。③影响因素上,环境保护力度、科技创新能力、对外开放规模,海洋新兴产业等有待提高和发展。最后针对我国海洋经济高质量发展,提出相应建议。     

郑州与福州降水同位素特征及水汽来源对比分析

研究基于郑州与福州两地区GNIP(1985—1992年)大气降水同位素资料,对其大气降水同位素的季节变化以及环境因子进行比较分析。结果表明,郑州地区较福州地区季节变化明显,且两地区与温度和降水量均呈现负相关关系;根据两地区大气降水线方程得出,福州地区大气降水线方程斜率和截距大于郑州地区;两地区的d-excess值夏季高,冬季低;福州地区受台风影响,两地区降水量差别较大导致降水量在决定两地区月加权平均d-excess值时,福州地区整体比郑州地区偏大;采用MeteoInfo软件,并利用由美国国家大气研究中心所提供的气象资料,对两地区气团轨迹进行后向模拟,比较分析得出:郑州地区在夏季大部分水汽来自南海,春季、秋季和冬季的水汽均来自北方大陆;福州地区在夏季的水汽全部水汽来自低纬度的海洋,而春季、秋季和冬季的水汽仅有少部份来自北方大陆。