设置套管阻尼器的框架支撑结构参数分析∗

提出了两种设置套管阻尼器的框架支撑结构。改变套管阻尼器的相对刚度、相对长度与屈服比等参数值以及套管阻尼器的布置方式,利用 ETABS 软件建立有限元模型,对框架支撑结构进行动力时程参数分析,提取结构的底部最大剪力和最大层间位移角作为结构地震响应的衡量标准,探究套管阻尼器的参数变化和布置数量对结构地震响应的影响规律,发现:对第一种结构形式,套管阻尼器的相对刚度、相对长度和屈服比宜取为 0.4、0.5 和 0.2;对第二种结构形式,套管阻尼器的相对刚度、相对长度和屈服比宜取为 0.6、0.5 和 0.4;并非各楼层都布置阻尼器可取得最佳的减震效果,对本文提出的两种设置套管阻尼器的工程应用形式而言,在底部四层设置套管阻尼器减震效果最好。     

储罐底板维修决策方法研究

储罐底板腐蚀是储罐失效的主要原因之一,对底板的腐蚀检测方法目前有很多种。每种方法都有自己的优势,但同时也存在着相应的弊端。通过在实践应用中对比漏磁检测与超声测厚检测方法,分别指出两种检测方法的优势与实践应用中存在的问题,提出应综合应用两种方法来提高效率和确保准确性。为更好地利用检测技术保障储罐安全提出参考建议。     

Source separation of household waste: a case study in China

A pilot program concerning source separation of household waste was launched in Hangzhou, capital city of Zhejiang province, China. Detailed investigations on the composition and properties of household waste in the experimental communities revealed that high water content and high percentage of food waste are the main limiting factors in the recovery of recyclables, especially paper from household waste, and the main contributors to the high cost and low efficiency of waste disposal. On the basis of the investigation, a novel source separation method, according to which household waste was classified as food waste, dry waste and harmful waste, was proposed and performed in four selected communities. In addition, a corresponding household waste management system that involves all stakeholders, a recovery system and a mechanical dehydration system for food waste were constituted to promote source separation activity. Performances and the questionnaire survey results showed that the active support and investment of a real estate company and a community residential committee play important roles in enhancing public participation and awareness of the importance of waste source separation. In comparison with the conventional mixed collection and transportation system of household waste, the established source separation and management system is cost-effective. It could be extended to the entire city and used by other cities in China as a source of reference.     

无机碳对浮游藻类生长和群落结构的影响

采用水族箱生态模拟方法,利用碳酸钠和碳酸氢钠作为碱度调节剂设置不同碱度水平,研究了氮磷营养相对充足的试验水体中藻类各相关指标对无机碳的响应,并对试验过程中所测得的理化指标和生物指标进行统计分析.研究表明:富营养水体无机碳含量与藻类叶绿素水平存在着正相关关系;适当增加水体中的无机碳浓度能够改变蓝、绿藻门种类比例;当碱度水平达到一定程度时,铜绿微囊藻可以逐渐成为优势种,并从体系中上升,演替成为水华.     

蒽醌染料及中间体脱色优势菌的特性研究和基因定位

本文对分离到的两株蒽醌染料脱色优势菌的脱色能力及其基因定位进行了研究,结果表明,ＮＤ１,ＮＤ２均能有效脱除活性艳蓝ＫＮ－Ｒ及溴氨酸的色度;两株优势菌均含有质粒,其降解染料的能力是由质粒控制的;并考察了不同碳源、氧、温度、ｐＨ值等理化因素对菌株降解染料的影响。     

活性污泥胞外多聚物的研究进展

本文阐明研究胞外多聚物的重要性入手,从它的性质,来源,在污水和污泥处理中各方面的影响作用,以及胞多聚物的分离提取方法几方面,综述了活性污泥胞外多聚物的研究发展和现状,并提出了一些可供进一步的探索的问题。     

干旱指标及其在新疆阿勒泰地区干旱监测分析中的应用

干旱是限制新疆阿勒泰地区农牧业生产可持续发展最主要的自然灾害之一,研究适合该区的干旱指标,是进行有效干旱监测的基础。采用新疆阿勒泰地区7个气象站1961-2008年4-10月月平均气温、降水量资料,首先通过Thomthwaite方法计算潜在蒸发量确定K干旱指数,然后对R指数、Z指数、K指数3种干旱指标进行了分析,结果表明,在监测诊断干旱轻重程度上,K指数能较客观地反映出干旱程度,R指数和Z指数监测干旱程度较轻。在此基础上,基于K指数建立的阿勒泰地区干旱监测评价的强度指数和面积指数,对该地区近48年来干旱的变化进行了分析,表明该地区干旱灾害主要集中在春夏季节,春夏连旱几率较高,强度较大;该地区干旱灾害具有阶段性特征,近年来干旱发生的频次有增多的趋势,其中秋季干旱相对较为明显。     

超临界水氧化法处理苯胺废水

水样中苯胺的超临界水氧化（SCWO）表明氧化剂过氧化氢的用量,试验温度,压力和停留时间对水中TOC的去除率有显著影响,在500℃,25MPa和K1．1条件下,停留时间为35s,TOC去除率可达99％以上,TOC去除率随起始浓度的增加而提高,这表明SCWO适于处理高TOC值废水。     

磷酸三苯酯经miRNA介导的人肝细胞脂类代谢干扰作用

磷酸三苯酯(triphenyl phosphate,TPhP)是近年来广泛应用于电子产品的磷系阻燃剂,其脂类代谢干扰作用受到广泛关注,而microRNAs(miRNAs)在 TPhP脂类代谢干扰过程中的调控作用仍鲜有报道.本研究通过探讨TPhP暴露条件下人肝细胞的细胞活性、TPhP清除速率与miRNAs表达调控特征,并...     

PAH emission from the incineration of three plastic wastes

A batch-type, controlled-air incinerator was used for the treatment of polyvinyl chloride (PVC), high-density polyethylene (HDPE), and polypropylene (PP) plastic wastes. The concentration and composition of 21 individual polycyclic aromatic hydrocarbons (PAHs) in the raw wastes, flue gas (gas and particle phases), and ash were determined. Stack flue-gas samples were collected by a PAH stack-sampling system. Twenty-one individual PAHs were analyzed primarily by a gas chromatograph/mass spectrometer (GC/MS). The CO concentration correlated well with the total PAH (R2 > .89), and thus can be used as a surrogate indicator for PAH emission. Excess amounts of air supply in the incineration of plastic wastes could decrease not only the concentration of the PAHs in the bottom ash but also the emission factor (EF) of the total PAH in the stack flue gas. Of the three plastic wastes, HDPE was found to have the highest mean EF of the total PAHs (462.3 mg/kg waste) from the stack flue gas. Incinerating PVC would result in a higher EF of PAHs (195.4 mg/kg waste) in the bottom ash. When PVC plastic wastes were incinerated, higher-ringed PAHs constituted a larger percentage in the bottom ash as compared to those from PP and HDPE plastics. By judging the output and input (O/I) ratio of the PAHs from the incineration trials of plastic wastes, the PAHs involved in incineration of three plastic wastes were almost entirely destroyed; and a low residual amount between 0.00018 and 0.00032 remained in the emission.