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选择Zn系层状双金属氢氧化物（LDHs），采用水热-共沉淀法合成3种不同类型的Zn-LDHs（FeZn-LDHs、CoZn-LDHs和AlZn-LDHs）并覆膜于常用人工湿地沸石基质表面；利用模拟垂直流人工湿地小试系统，对原始沸石及3种Zn-LDHs覆膜改性沸石基质进行除磷净化实验、等温吸附-解吸实验以及动力学吸附实验，通过上述实验对以Zn-LDHs覆膜改性沸石基质为代表的改性基质除磷机制进行研究...
低浓度氨氮废水单级自养脱氮EGSB反应器的快速启动
单级自养脱氮工艺 低浓度氨氮废水 启动 颗粒污泥 膨胀颗粒污泥床反应器
2016/12/6
将单级自养脱氮生物膜污泥作为种泥接种于膨胀颗粒污泥床反应器中，并对该反应器进行启动. 在温度为（30±2）℃，pH值为7.8~8.2，DO为0.2~1.1 mg·L-1，上升流速为2.0~4.0m·h-1的条件下，进行了低浓度氨氮（60~100 mg·L-1）废水的单级自养脱氮工艺快速启动研究. 结果表明，经过83 d的运行，反应器历经适应期、提高期和稳定期后，稳定运行阶段NH4+-N、TN去除率...
针对弹体可能受到非对称力作用从而发生弹道偏转的问题，对刚性弹正侵彻随机骨料混凝土靶的弹道偏 转规律进行分析。采用混泥土细观模型，运用LS-DYNA 显式动力计算软件，对刚性弹正侵彻随机骨料混凝土靶进 行数值模拟。以弹体偏转角度为指标，重点考虑混凝土靶的骨料/砂浆强度、弹体侵彻速度等因素，讨论其对弹体正 侵彻条件下弹道偏转的影响规律。结果表明：根据混凝土的材料特性，可认为砂浆和骨料共同对正侵彻弹体提...
传统的Burgers模型假设只有偏应力引起蠕变，而没有考虑围压对蠕变特性的影响，因此其主要用于描述岩石的蠕变特性。但不同于岩石，堆石料等粗粒土是由颗粒集合而成的摩擦型材料，其蠕变特性与围压密切相关。为了考虑围压对粗粒土蠕变特性的影响，该文首先推导了Burgers模型的三轴蠕变理论解，并根据各参数物理意义，提出一套简便实用的参数反演方法，用于获取同一围压不同偏应力下粗粒土的Burgers模型参数；进...
飞机撞击荷载计算模型中压溃力选取分析
计算公式 压溃力 安全壳
2016/3/1
Riera提出的飞机撞击荷载计算模型是一种比较实用的简化模型,大多数研究在进行飞机撞击试验和数值模拟时通常会把试验结果和数值模拟结果与该模型的计算结果进行对比分析。通过介绍分析Riera模型,该模型中撞击荷载包括压溃力和惯性力两部分,因此模型的使用需要确定压溃力大小。为了合理使用Riera模型,梳理了现有压溃力计算公式,各公式给出的压溃力计算结果差别较大,并通过公式推导预测弹体的变形长度和撞击作用...
通过3种高宽比、3种粗糙度流场、多种质量-阻尼参数的多自由度气弹模型风洞试验，分析了折算风速、风场粗糙度、高宽比、结构质量、结构阻尼比和涡振位移等因素对横风向气动阻尼比的影响。分析表明，正气动阻尼比与结构阻尼比负相关，而负气动阻尼比绝对值与结构阻尼比正相关，结构质量与气动阻尼比绝对值负相关，风场越粗糙或模型高宽比越小负气动阻尼比越不显著。整体来看，气动阻尼比本身不足以评价气弹响应的显著程度，以气动...
钢板桩围堰止水性能试验及其应用研究
钢板桩 围堰 止水 室内试验
2018/10/8
受水荷载作用后,钢板桩围堰结构易产生渗水或大变形,导致施工难度增大,甚至引发工程事故.通过开展钢板桩围堰止水性能试验,对比分析了钢板桩在无止水材料、含沥青类材料或含膨胀性止水材料三种情况下的止水效果,结果表明:在透水层厚t=50 cm时,若钢板桩锁扣处无止水材,其换算透水系数为0.1～1 cm/s；若在锁口处涂抹止水材料,钢板桩整体换算透水系数小于1×10-6 cm/s,但钢板桩锁口处局部透水量...
An Approach to Building Grouping Based on Hierarchical Constraints
Building generalization building grouping hierarchical constraints Gestalt factors minimum spanning tree
2015/12/2
Building generalization is one of the difficult operations in automated map generalization. It usually consists of two consecutive steps, i.e. dividing buildings into groups (also called building grou...
Modelling Multi-temporal Land Use Changes
multi-temporality RS imagery Maxent machine learning urban morphology Wuhan
2015/12/2
Understanding temporal urban growth is very crucial to the interpretation of urban morphology and a key challenge for the study of rapid urbanization in contemporary China. Previous land use change mo...
There is a need to reverse engineer architectural hardware, with hinges and brackets being typical, for use in the restoration of buildings in which the original hardware is damaged. Another use for r...
First Experiences with the Deformation Analysis of a Large Dam Combining Laserscanning and High-Accuracy Surveying
Civil Engineering Laserscanning Surveying Deformation Analysis
2015/11/13
Monitoring the static and dynamic behaviour of large dams has always been a topic of great importance, due to the impact these structures have on the whole landscape where they are built. Many instrum...
Ajax Web Scripting Applied to Interactive Stereoscopic Imaging
Cultural Heritage Education Internet/Web CAD System
2015/11/13
Creating the illusion of depth in images was first invented 1838 by Sir Charles Wheatstone. It is today still a great experience to view high quality large format images with depth perception, excepti...
The Restoration Of The Superstructure Of The Propylaia Central Building: Study And Intervention
Archaeology Architecture Cultural Heritage History Metrology Reconstruction Research
2015/11/13
The oxidation of the iron elements, installed in the parts of the superstructure of the Propylaia central building which had been restored by Balanos between 1909-1917, made necessary the disassembly ...
Parthenon Restoration Project
Archaeology Architecture Cultural Heritage Reconstruction Building Method Project
2015/11/13
The solid rock of the Acropolis on which it was built, the material and the quality of the construction, are most probably the reasons thanks to which, in a country with so many earthquakes. The prese...
Survey Procedure And Archaeological G.I.S Data Base for the Medieval Mine of Rocca San Silvestro
Close range & aerial survey 3d models GIS
2015/11/13
This paper concerns some result produced following a scientific line planned for the integration of several survey techniques implementing a simple methodological approach to harmonize the scientific ...