韩城电厂边坡变形机理及稳定性分析

本文采用工程地质勘察方法，揭示韩城电厂边坡的变形机理，并用弹塑性有限元对边坡进行了稳定分析，取得了与实测变形值一致的结果。     

仪化废水中乙醛污染的调查

通过对中国石化仪征化纤股份有限公司（以下简称仪化公司）排放废水中乙醛污染的调查，表明仪化公司排放的含乙醛废水主要产生于聚酯生产过程中的工艺废水，喷淋废水，冲洗地面和其他跑、冒、滴、漏的废水（“清下水”）。1996年－2000年污水处理场日排放含乙醛废水约5.66万t，日排放含乙醛的“清下水”约3万t。排放的乙醛在长江仪征段未检出，在沿山河和胥浦河水中有不同程度的检出和超标，超标率分别为50％和9.1%，最大超标倍数分别为8.88倍和0.14倍。对长江仪征段乙醛污染的影响预测结果为：污水处理场在非正常处理情况下（即直排），其排放的废水将在排污口周围形成长1250m，宽200m的污染带，污染面积为25万m^2。     

棉浆粕蒸煮黑液处理工程实践

棉浆行业碱法蒸煮黑液是当前废水治理中的难题之一。本文介绍采用酸析气浮 +A O法 +混凝工艺处理棉浆黑液的工程实例。工程运行结果表明 :该工艺对CODCr和色度的去除率可达 98%以上 ,出水水质达到排放标准 ,并且处理效果稳定     

噪声对人体的影响不容忽视

1噪声的危害 生产环境中，由于生产原因所产生的使人不舒服、厌烦、难以忍受的声音．都属于生产性噪声。生产性噪声主要包括机械噪声、空气动力噪声和电磁噪声，如井下打钻、矿山开凿时产生的噪声。     

南京地区地铁车站深基坑变形性状分析

收集了南京地区地铁车站深基坑实测数据,系统分析了南京地区不同工程地质条件下地铁车站深基坑变形特性。结果表明:①基坑围护结构最大侧移变化范围为(0.09%~0.24%)H-e,其中长江河漫滩区、秦淮河古河道区、阶地区的最大侧移δ_hm的平均值分别为0.13%H_e、 0.18%H_e、0.16%H_e;②基坑围护结构最大侧移点埋深位置H_m位于(H_e-8,H_e+4.5)之间;③基坑围护结构的插入比主要在0.2~1.0;基坑稳定数在0.15~0.32范围内;基坑围护系统的综合刚度介于40.2~1 452.9;④基坑地表沉降呈凹槽型分布形态。基坑周边最大地表沉降δ_vm变化范围为(0.023%~0.367%)H_e,最大地表沉降平均值约为0.167%H_e。阶地区的地表沉降值及范围小于河漫滩区、秦淮河古河道区的。δ_vm/〖WTBX〗δ_hm的变化范围为0.2~2.0。     

面向社会积极开展防震减灾宣传工作

<正>近年来,攀枝花市防震减灾宣传工作牢固树立以人为本的基本理念,坚持贴近实际、贴近生活、贴近群众的宣传方针,围绕服务大局、服务经济、服务群众,在宣传防震减灾方面的新思路、新举措、新成果、新经验等方面做了大量卓有成效的工作,搭建了一个有利于更好开展防震减灾工作的平台,取得了明显的实效,有力地推动了全市防震减灾     

多层砌体房屋震害预测分析

对目前我国房屋建筑中一种最为广泛应用的结构形式房屋——多层砌体房屋进行震害预测分析研究,简要介绍六种常用的多层砌体震害预测方法,易损性概率分析法或称为半经验半理论法、强度判别法、延性系数判别法、模糊类比法、人工神经网络法和结构理论计算法,在详细调查房屋基本情况的基础上,综合考虑以上几种方法,提出相应的震害预测的分析方法。对郑东新区砌体房屋进行震害预测,做出该地区的震害矩阵,并给出该地区砌体房屋在地震作用下的破坏程度及相应震害面积。     

地铁隧道不同排烟风速对火灾烟气控制的模拟分析

以某地铁隧道过江段为研究对象,基于CFD数值模拟方法,采用大涡模拟火灾分析软件FDS对相同纵向风速条件下,排烟道内不同排烟风速对地铁列车火灾烟气控制效果的影响进行模拟对比分析,分析结果可为设计单位对在排烟风机的选取提供一定的参考。模拟分析的结果表明,当纵向风速设定为1m/s时,排烟风道内排烟风速为5m/s即能达到较好的地铁列车火灾烟气控制效果。     

Large eddy simulation of flow and scalar transport in a vegetated channel

Predicting flow and mass transport in vegetated regions has a broad range of applications in ecology and engineering practice. This paper presents large eddy simulation (LES) of turbulent flow and scalar transport within a fully developed open-channel with submerged vegetation. To properly represent the scalar transport, an additional diffusivity was introduced within the canopy to account for the contribution of stem wakes, which were not resolved by the LES, to turbulent diffusion. The LES produced good agreement with the velocity and concentration fields measured in a flume experiment. The simulation revealed a secondary flow distributed symmetrically about the channel centerline, which differed significantly from the circulation in a bare channel. The secondary circulation accelerated the vertical spread of the plume both within and above the canopy layer. Quadrant analysis was used to identify the form and shape of canopy-scale turbulent structures within and above the vegetation canopy. Within the canopy, sweep events contributed more to momentum transfer than ejection events, whereas the opposite occurred above the canopy. The coherent structures were similar to those observed in terrestrial canopies, but smaller in scale due to the constraint of the water surface.     

Experimental study on microalgae cultivation in novel photobioreactor of concentric double tubes with aeration pores along tube length direction

Microalgae have been identified as a superior feedstock for biodiesel production and varied tubular photobioreactors are developed for high efficient and scale-up microalgae cultivation. This article presented a novel concentric double tubes using aeration through radial pores along the length direction of inner tube. Experiments on microalgae cultivation were carried out in the novel photobioreactor, and two control groups including concentric double tubes with axial aeration at both ends and common tubular. The biomass productivity of novel photobioreactor increased by 43.6% and 107.4%, respectively, compared with concentric double tubes with axial aeration at both ends and common tubular without aeration. The values of pH shifted from 7.5 to 9.0 for novel photobioreactor, but 7.5 to 8.8 for common tubular, and 7.5 to 9.6 for concentric double tubes with axial aeration. The dissolved oxygen concentration fluctuated between 6.0 and 7.0 mg·L^?1 for novel photobioreactor, but rose from 6.6 to 10.2 mg·L^?1 for the common tubular, and 6.9 to 8.1 mg·L^?1 for the concentric with axial aeration. Results show that the aeration style of novel photobioreactor can make efficient local mixing and maintain smaller range of pH and lower level of dissolved oxygen in case of higher biomass concentration. Moreover, compared with the two control groups, the novel concentric double tubes have advantages on the light/dark cycle frequency, which may be benefit for microalgae cultivation. The novel concentric double tubes presented in this work can give some inspiration for high efficiency microalgae cultivation.