共查询到20条相似文献,搜索用时 140 毫秒
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基于江西洪屏抽水蓄能电站地下厂房工程的施工,根据地下洞室支护的要求和特点,对锚杆的施工质量进行无损检测试验研究,并对检测技术进行探讨。结果表明,无损检测技术丰富了隧洞围岩锚杆质量检测手段,在地下洞室工程建设中具有良好的应用前景。 相似文献
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面波法在水工隧洞混凝土质量无损检测中的应用 总被引:1,自引:0,他引:1
依托引滦入津输水隧洞混凝土边墙衬砌质量检测工程,从频率特性和现场环境下的可操作性等方面优化震源激发方式,优化检波器设置方式,研发出适合水工隧洞快速无损检测的设备和施工方法;对依托工程中的受损水工隧洞进行详细的无损检测,结合工程实际检测数据的处理,研究各种混凝土配合比下的弹性波速度和混凝土抗压强度对应关系,进而综合判断0.1 m范围内混凝土的劣化情况。用面波法对隧洞边墙混凝土进行了检测评价,并与取芯结果进行了比较。结果表明,该方法穿透深度大、不受钢筋影响,能够快速准确地进行水工隧洞混凝土质量的检测。 相似文献
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锚杆锚固技术正在世界各地的隧道、采掘和高边坡等工程支护中广泛应用,尤其在长距离隧洞施工中因围岩渗水、岩爆、断层等地质原因必须采用锚杆进行锚固支护,然而该支护方法属于隐蔽工程,怎样才能对所施工锚杆的质量进行检测,本文简要介绍锚杆无损检测技术在锦屏工地的应用。 相似文献
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本文主要介绍磁法及电磁法对隧洞钢拱架及其地下连接筋检测的应用 ,运用CCT - 1磁梯度探测仪及管线探测仪对隧洞钢拱架及其地下连接筋进行检测 ,通过实例说明了该方法是可行和有效的 ,拓宽了方法的应用领域。 相似文献
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常低温下EGSB处理生活污水的影响因素研究 总被引:2,自引:0,他引:2
在15~26℃的常低温条件下,采用EGSB处理生活污水,考察了进水流量、回流比、液体上升流速(Vup)、温度等因素对运行效果的影响。结果表明,当温度为26℃左右时,对于9~11 L/h的低进水流量,宜采用高回流比(1.6~2.5),对COD的去除率最高可达90%;对于15~24L/h的高进水流量,宜采用低回流比(0~0.6),对COD的去除率最高可达84%;当进水流量提高至30 L/h时,不宜回流,对COD的去除率降至77%;当进水流量分别为9、11、15、24、30 L/h时,最佳Vup分别为4.0、(3.1~3.6)、(2.7~3.4)、3.0和3.8 m/h,此时对COD的去除率分别高达90%、(87%~89%)、(83%~84%)、83%和77%;在无回流的条件下,适宜的进水流量为15~24 L/h,相应的HRT为0.5~0.8 h。当温度为15~26℃时,EGSB适宜的运行条件是高进水流量(15~24L/h)、高Vup(3.0 m/h)和低回流比(0~0.6),此时对COD的去除率高达81.9%以上。 相似文献
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In recent years, researchers have paid increasing attention to the provision of access to clean and sufficient drinking water, sanitation facilities, and proper waste management in developing countries. This paper examines household access to these services in urban areas of Nepal by studying the comprehensive data of the Nepal Living Standard Survey (NLSS) for the 1995-1996, 2003–2004, and 2010–2011 periods. Multinomial logit models are employed to identify and analyse potentially influential factors. We find that education levels, household wealth, and distance to markets are among the significant determinants of household access to safe and secure drinking water, flush toilets connected to septic tanks, and proper liquid and solid waste disposal. Households located in relatively developed regions, such as the Midwest and Far West, tend to have better access to these services compared to households located in the ecologically sensitive mountainous regions. Education and employment opportunities are also relevant to service access in urban areas of Nepal. Stakeholder involvement and effective governmental intervention are also necessary. 相似文献
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当前大学校园改扩建工程中存在着新旧建筑及建筑与环境如何协调的问题,本文以辽宁科技大学新校区的扩建及旧建筑的改造为例,通过理论研究和实例剖析,总结归纳了处理大学校园新旧建筑关系及建筑与环境相互协调的5种手法:确立中心、协调、对比、存留及整合景观与环境。本文结论进一步丰富和提高处理新旧建筑与校园环境协调方面的经验和手法,可为广大关注大学校园建设问题的相关人员提供借鉴和参考。 相似文献
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James W. Axley 《Indoor air》1993,3(4):298-309
Adsorption, desorption and chemisorption are known to impact the dispersal of volatile organic and chemically reactive compounds in buildings. These same three processes may be used to advantage to control the levels of these compounds indoors using building sorption filtration devices. To add to the understanding of these processes, to provide the means to predict the impact of these processes on human exposure and to provide the tools needed to design gaseous filtration systems to mitigate the exposure to these compounds, a general approach to modeling the dynamics of these processes is presented. Equations are presented to account for the elemental advection, diffusion, sorption, and chemical transport steps affecting single component sorption dynamics in rooms and sorption filtration systems. These element equations are based on general principles and formulated in terms of fundamental physical parameters that may be determined using standard procedures. Models to predict room and sorption filtration system dynamics are formulated using assemblages of these element equations and a series of simplified models of these systems are derived. Initial applications to model single-component sorption transport in rooms and sorption filtration systems indicate that the approach has the potential to provide accurate predictions providing the sorption and chemical characteristics of the sorbate-sorbent system being considered are well-characterized. This potential is, however, compromised by the lack (or present uncertainty) of fundamental data relating to sorption equilibrium, porous diffusion, surface chemistry, and boundary layer mass transport 相似文献
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室内设计不仅要满足其功能实用,更要在以人为本的前提下运用形式语言来表现题材、主题、情感和意境,形式语言与形式美则可通过各种方式表现出来。一个设计工作者应关注生态和环境问题,有意识地吸收生态、环境等相关专业知识,提出注重生态的设计理念来。 相似文献
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采用混凝沉淀/水解酸化/膜生物反应器组合工艺对天津港南疆港区含油废水处理系统进行升级改造,实现了3600m3/d含油废水的达标排放。实际运行表明:在生化系统进水COD、BOD5、石油类、NH3-N、TN、TP分别为(400~2520)、(102~626)、(10~25)、(25~40)、(35~50)、(0.8~1.5)mg/L时,生化系统出水COD、BOD5、NH3-N、TN、TP分别为(31~46)、(3.2~9.6)、(1.2~2.9)、(3~12)、(0.13~1.0)mg/L,石油类未检出,出水水质达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级B标准。 相似文献
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《Material Religion》2013,9(1):110-120
ABSTRACTThe articles in this special issue demonstrate how objects can be interpreted as agents, as gendered images that make a statement, and how their impacts can be understood and assessed by human actors. They are differentially placed in matrices of power, and they can be manipulated to shift genders, to play with gendered combinations, to expand the limits of a particular gendered domain, to creatively play with reproductive imagery, and even to sell commodities in new and enticing ways in the mass media. Gendered religious objects are “statements” addressed not only to the eye but to the emotions, and part of a complex cultural field in which things can play important roles in people's lives. The links that connect ritual power to other forms of agency and biographical significance are perhaps the most significant links that we need to examine to understand them better in a world of many diverse cultural forms. 相似文献
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城市与记忆:心理学视维中的城市历史延续与发展 总被引:2,自引:0,他引:2
所有的城市都包含了记忆的因素。城市的记忆作为一种宝贵的资源,通过显性物质实体与化心理潜质在现实、未来中存在、变化与延续着,它成为城市人感知、体验与理解自身与其生存环境在时间因素中延承变换的基本脉络线索。但是,在城市大规模的改造与更新进程中,城市记忆的人为破坏与丧失已经再也不能使城市成为人们记忆中那熟悉的家园和故乡。为了避免割断和扭曲城市的历史,保持城市个性的统一性与完整性,塑造城市精神的真实性与独特性,对城市进行类似于心理学精神分析的记忆分析方法不失为一种研究城市历史延续与发展的科学方法。本试图在心理学的范畴为城市历史延续与发展研究提供一个视角,从城市记忆这个更为内在和深层的结构上对于当前城市建设中存在的一些问题进行剖析。 相似文献
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对荔枝公园北门出入口改造工程设计方案进行了阐述,从设计风格、传统自然的选择、景观差异性、突出重点等方面科学深入地进行了方案评析,强调了坚持岭南园林风格的特点和长处,并与现有风格最大相融合的观点,注重景观的创新与别致实用,坚持重视自然景观,尽量减小人工改造对自然景观的影响和破坏,公园的出入口标识引导设置明显,并给出了调整后的方案设计图。 相似文献