芦山地震单开间砌体结构房屋震害特征∗

4.20芦山地震灾区临街自建单开间砌体结构房屋震害特别严重,本文基于现场调查研究该类特殊房屋的建造习惯、震害特征与损伤机理,研究表明:单开间砌体房屋是芦山地震灾区等四川小城镇比较常见的临街建筑模式,其平面狭长,建造随意,结构体系不合理,构造措施不到位,抗震能力弱;芦山地震地震烈度8、9度灾区单开间砌体房屋底层纵墙剪切破坏,普遍出现严重的贯通整片墙体的斜裂缝或X形裂缝。底层前部房间横墙无纵向支撑,独立墙段过长,横墙压弯破坏出现贯通整片墙体的水平裂缝,并且墙体外鼓;结构刚度中心与质量中心严重偏离,房屋扭转震动加剧墙体裂缝开展,相邻建筑反复碰撞作用是上部楼层震害的主要原因;鞭梢效应加重突变楼层结构损伤,引起出屋面附属建筑严重破坏甚至倒塌,横墙端部剪切断裂乃至溃散。据此,提出了既有单开间砌体房屋加固工作的建议。     

低温等离子体治理恶臭气体研究进展

介绍了恶臭气体的分类和来源、传统的除臭方法以及这些方法的缺点;简述了低温等离子体产生的方法及其治理恶臭气体的机理;论述了介质阻挡放电、脉冲电晕放电、滑动弧光放电和其他方法在除臭方面的国内外研究进展;指出了利用等离子体治理恶臭气体存在的主要问题及其今后的研究方向。     

废水处理用微电解规整化填料的制备

以黏土、铁屑和活性炭为原料,加入一定量的添加剂,以水为黏合剂造粒,在一定温度下焙烧制成颗粒状微电解规整化填料。实验结果表明：在黏土、铁屑、活性炭的体积比为2：4：4、氯化铵为添加剂、添加量为0．5％（质量分数）、焙烧温度为600℃的条件下,制备的微电解规整化填料具有最佳的废水处理效果。用该填料处理低浓度染料废水（废水COD为591．5mg／L）,COD去除率可达75％以上。     

生物法生成单质硫过程中氧化还原电位的研究

采用升流式好氧反应器,接种实验室自行培养的排硫硫杆菌,进水硫化物质量浓度为343～356 mg/L,在不同容积负荷下,研究不同氧化还原电位(ORP)对硫化物生物转化的影响.结果表明,ORP为(-260±10)mV时,硫化物去除率均达95%以上;随着ORP的降低,硫化物去除率和硫酸根生成率均呈下降趋势;不同容积负荷下,控制合适的ORP均可得到单质硫的最大生成率.     

Synergistic roles of montmorillonite and organic matter in reducing bioavailable state of chromium in tannery sludge

Environmental Science and Pollution Research - Organic matter (OM) has an excellent retention effect on stabilizing chromium (Cr), and functional groups on OM play a predominant role in this...     

Review and prospect of research on road traffic flow energy model

Environmental Science and Pollution Research - Energy is a necessary prerequisite for the operation of road traffic flow. Describing the phenomena of traffic flow from an energy perspective will...     

Hydrochemical characteristics and quality assessment of shallow groundwater in Yangtze River Delta of eastern China

Environmental Science and Pollution Research - Water resource is in high demand within the Yangtze River Delta, given its developed economy. Long-term exploitation of this resource has posed risks...     

Spatio-temporal analysis of air pollution in North China Plain

Environmental and Ecological Statistics - Accompanying China’s rapid industrialization, a vast area of the country, particularly the Beijing–Tianjin–Hebei (BTH) region, has...     

Development of Smart Colorimetric Sensing Films Carbohydrate-Based with Soybean Wax and Purple Cauliflower Anthocyanins for Visual Monitoring of Shrimp Freshness

Journal of Polymers and the Environment - Novel pH-colorimetric intelligent films were designed from agar and methylcellulose matrix (AM) with soybean wax (SBW) in several percentages (5, 10, 15,...     

Noise exposure and risk of myocardial infarction incidence and mortality: a dose–response meta-analysis

Environmental Science and Pollution Research - The strength and shape of the dose–response relationship between different types of noise and myocardial infarction (MI) remain unclear....