Nano zero valent iron/modified semicoke composites for the removal of coal tar wastewater

ABSTRACT

The coal tar wastewater was treated by self-synthesized nano zero valent iron (NZVI)/modified semicoke composites. Phenol was employed as simulated sample due to high content of phenol in coal tar wastewater. The results show that the phenol removal rate started to rise with the increase of modified semicoke amount and aging time, reached maximum at certain value, and then began to decrease. With the reaction time extending, phenol removal rate increased gradually, while phenol removal rate came down gradually as the initial phenol concentration rise. The XPS, XRD, and SEM results indicate that NZVI with uniform size was well-distributed on the surface of modified semicoke.     

环境友好为切入点的基层中医医疗环境建设研究——以河源市中医院建筑改扩建工程为例

河源市中医院新院建筑改扩建工程设计,是以环境友好概念为切入点而制定相关的设计原则。不仅要坚持以改造建设为主要,有重点、有节制地介入医疗建筑的设计思路,而且在保护传统中医文化的同时,努力改善以病人为中心医疗环境和就诊条件的设计方法,从而实现基层中医医疗环境建设走向良性循环的发展道路。     

保障性住房的公共服务体系建构

通过对保障性住房目标人群的居住需求分析归纳出:居住需求可根据时间分为“永久性”与“非永久性”;居住空间可根据功能分考“核心”与非核心”功能空间:基于预期需求的住宅产品价值消费具有被动性特点.在此基础上,结合我国保障性住房建设的约束性条件,提出若干保障性住房的公共服务功能建设构想.     

降低调压器出口压力减小输差的可行性分析

对通过降低调压器出口压力来减小输差的理论基础进行探讨.结合工程实例,对该方法进行可行性分析.     

Cyclic testing of steel column-tree moment connections with weakened beam splices

Traditionally, the beam splice assemblies of column-tree connections are designed according to the full-strength design principle. Actually, the beam splice is set up at a certain distance from the column face, thus the plastic moment capacity of the beam splice does not need to be greater than the plastic moment capacity of the beam. This paper experimentally presents the effects of the weakened beam splice on the seismic performance of column-tree steel moment connections. Cyclic tests of two column-tree connection specimens with weakened beam splices and one specimen following the full-strength design principle were conducted to verify their inelastic behavior and failure modes. The test results showed that the moment resisting capacity of the column-tree connection specimens with weakened beam splices did not obviously decrease. Also, their energy dissipation capacity was better than that of the specimen following the full-strength design principle.     

地下工程静电除氡原理与试验

为了解决目前地下工程内部氡污染严重的问题,减少氡污染对地下工程内部工作人员健康的威胁,在综合比较和总结目前各国降氡技术的基础上,针对氡子体的存在形态及其特征,进行了静电除氡技术的可行性分析;研究了静电除尘的机理,对双区静电除氡技术进行了设计和研究,利用静电除尘的方式将结合态氡子体吸附去除;研制了双区静电型除氡装置,并结合工程实际做了相关的试验测试.结果表明:该装置具有高效的净化除氡功能,开机4h后的除氡率在90％以上.     

太阳能热水系统设计的计算分析

太阳能热水系统是近年来发展最快、最有活力的可再生能源利用技术。本文结合建筑工程热水系统的相关节能政策,结合工程实例对集中浴室的太阳能热水系统计算进行详细的剖析,希望能对同行在设计过程中提供帮助。     

高速公路路基沉降的蠕变模型预测

采用粘弹性蠕变模型，合理计算了实际高速公路工程路基的沉降，预报了该公路的工后沉降量，根据预报结果，可以为选择合适的路面铺筑时间提供科学依据。     

为推行清单计价模式建立完善的地方造价信息网

文章探讨了工程量清单计价模式下信息技术对工程量清单计价体系的影响,提出了建立完善的地方造价信息网的途径。     

房屋节能检测中的抽样方案

分析了双百分比抽样的OC曲线,认为双百分比抽样缺乏理论依据,房屋保温隔热性能检验应采用建立在数理统计基础上的检验标准.论述了制定房屋保温隔热性能检验抽样方案时要考虑的因素,建议可采用国家抽样检验标准GB/T13262-91、GB/T13264-91作为检验的依据,并指出了在使用时要注意的问题.