2,425 Works

Unfired clay – the green construction material

Emilie Kristiansen, Thea Gregersen & Kurt Kielsgaard Hansen
Unfired clay can be used as a green construction material alternative to ordinary concrete. The clay is mixed with sand, water and either crushed tiles or gravel. The method to process the clay in a wall construction is called pisé where the clay is stamped in layers inside the formwork. The clay has positive qualities regarding moisture and heat buffering of the inside air.

The impact of occupational health and safety policy interventions tailored to small enterprises in Denmark

Laura Veng KVORNING & Peter HASLE

From single-objective to multiple-objective multiple-rainfall events automatic calibration of urban storm water runoff models using genetic algorithms

F. Di Pierro, S.-T. Khu & D. Savic
The calibration of storm water runoff models is a complex task. Early attempts focused on the choice of a performance criterion function that could capture all the facets of the problem into a Single-Objective framework. Subsequently, the awareness that a good calibration must necessarily take into account conflicting objectives led to the adoption of more sophisticated Multi-Objective approaches. Only recently, the focus has shifted towards effective ways of exploiting the mounting information provided by the...

Pollution based real time control of a combined sewer overflow structure

K. Klepiszewski
Real time control processes in combined sewer systems are normally based on measurements of the hydraulic load conditions in the system. Dependent on the conditions, the flow in the system is adjusted to optimise the utilisation of available storage volume, to reduce discharged volume and pollutant loads into receiving water courses, and to support the operation of waste water treatment plants. Moreover, if the focal point of interest is the reduction of emitted pollutant loads...

A successful private company in industrial developing country. Managers' perspective

Houshang SHAHNAVAZ, E-C LÖNNROTH & F GHASEMZADEH

A multiscale finite-volume method for three-phase flow influenced by gravity

Ivan Lunati, Patrick Jenny & Ivan Lunati
A multi-scale finite-volume (MSFV) method for solving multiphase flow problem in highly heterogeneous media was recently developed. In contrast with classical upscaling techniques, the goal of multiscale methods is not simply to capture the large-scale effects of the fine-scale heterogeneity, but to provide an efficient tool for solving large flow problems with fine-scale resolution. The MSFV is based on a fractional flow formulation of the problem: first an equation for the total velocity is solved,...

Pore-network modeling to calculate transport properties from small-scale data

SAMIR BEKRI, OLGA VIZIKA & SAMIR BEKRI
Paper description: Modeling of two or three-phase flow in porous media is of prime importance in estimating the contamination of soils by liquid organic pollutants and in designing remediation solutions. For an accurate prediction of the transport properties of a porous medium, small-scale data on the pore space geometry and topology are needed. Although the small-scale structure is closely related to the capillary properties of the porous medium, it has been shown (Laroche and Vizika,...

Hydrological and hydraulic studies to analyse the main drainage system of the valley of Mexico

H. L. Cisneros-Iturbe & R. Dom\303\255nguez-Mora
ABSTRACT The present work deals with the mathematical simulations of the main drainage system of Mexico City, which serves an urban area of 20 million people on a surface of about 2500 km2. This system is composed by retention dams, surface channels, deep and semi-deep tunnels, pumping stations and retention lakes. Due to the aquifer\342\200\231s overexploitation and, its consequents, soil sink problems, the surface drainage channels have significantly diminished their conducting capacity. This has result...

Evaluation of thermal bridges by means of numerical simulation

Charlotte Gudum & Charlotte Gudum
Some themal bridges will always exist, where parts of the building envelopes have reduced insulation thickness. A thermal bridge will cause a local area with lower inside surface temperature, where the condensation of indoor moisture risk to cause local high relative humidity, and further mould growth. In practice it is significant that the cold bridge is detected in the design phase, before the building is build, so the design can be changed, and the damage...

Efficient and Accurate Simulation of Large General Reactive Multicomponent Transport Processes in Porous Media by Model-Preserving a priori and a posteriori Decoupling Techniques of Large General Reactive Multicomponent Transport Processes in Porous Media by Model-Preserving a priori and a posteriori Decoupling Techniques

Peter Knabner, Serge Kraeutle, Alexander Prechtel & Peter Knabner
Detailed modelling of reactive transport processes in the underground often requires the consideration of a wide range of reactive species. A prominent example is natural attenuation, that is the assessment and monitoring of microbially catalysed degradation processes of organic contaminants in the subsoil or aquifer with full geochemistry. Often the reactions exhibit a wide range of relaxation times, which advises to model those reactions being much faster than the time scale of the transport processes...

Scheduling home applications to reduce energy consumption

Ana Rossello-Busquet & Villy Bæk Iversen
In order to optimize the energy production, users should avoid consuming energy at the same time to avoid energy demand peaks. This can be achieved by setting a maximum energy consumption per user’s house. In other words, the overall consumption of the user’s appliances cannot exceed the maximum kwh. This project will study how home appliances tasks can be scheduled to not exceed this maximum consumption by using priorities.

Energy-efficient windows - for how long?

Agneta Olsson-Jonsson & Agneta Olsson-Jonsson
The purpose of this project has been to investigate the durability and lifetime of energy-efficient windows - to see how they age and whether their U-value changes with time, and also analyse problems with this type of windows. The thermal insulating properties of energy-efficient windows are mainly determined by the U-value of the glazed area. Therefore, the project has primarily included what’s happening to the glass part of the windows. In a number of buildings,...

An alternative procedure to avoid excessive numerical diffusion with the ELLAM

Anis YOUNES, Philip ACKERER & Anis YOUNES
In this work, the Eulerian-Lagrangian Localized Adjoint Method (ELLAM) is improved to better reduce the numerical diffusion when solving Advection Diffusion Equations (ADE). The ELLAM preserves the performance of characteristic methods and treats general boundary conditions naturally in their formulations. ELLAM is accurate for large time steps. However, when using several time steps, it is known that they suffer from numerical diffusion [2]. Because the location of the foot of the characteristic does not coincide...

An Integrated Media, Integrated Processes Watershed Model – WASH123D: Part 2 – Simulating surface water flows with different water wave models

GUOBIAO HUANG, Gour-Tsyh Yeh & GUOBIAO HUANG
The complete Saint Venant equations/2-D shallow water equations (dynamic wave equations) and the kinematic wave or diffusion wave approximations were implemented for 1-D channel network flow and 2-D overland flow in a watershed model, WASH123D. Careful choice of numerical methods is needed even for the simple kinematic wave model. Motha and Wigham (1995) reported numerical oscillation in Galerkin finite element of kinematic wave overland flow. Since the kinematic wave equation is of pure advection, the...

CDIO in a theory course without a project

Kirsten Isaksen
This paper describes a use of laboratory work related to the daily lessons in the bachelor study (Civil and structural engineering) in the 2. semester.

Pollution in storm water runoff in a highway toll gate area and performance of a source-area treatment technology

S. Papiri, C. Ciaponi, S. Todeschini & P. Valcher
This report describes the experimental equipment and the first results of a study to characterise the quality of storm water runoff in the area of a medium traffic flow highway toll gate and also to evaluate the efficiency, for this type of surface, of a \342\200\234source-area treatment\342\200\235 technology currently on the market called EcoDrainTM. This system was designed to reduce pollutants carried into storm drains by water runoff via filtration and absorption. The report presents...

Urban run-off volumes dependency on rainfall measurement method - Scaling properties of precipitation within a 2x2 km radar pixel

L. Pedersen, N. E. Jensen, M. R. Rasmussen & M. G. Nicolajsen
Urban run-off is characterized with fast response since the large surface run-off in the catchments responds immediately to variations in the rainfall. Modeling such type of catchments is most often done with the input from very few rain gauges, but the large variation in rainfall over small areas suggests that rainfall needs to be measured with a much higher spatial resolution (Jensen and Pedersen, 2004). This paper evaluates the impact of using high-resolution rainfall information...

A new overflow measurement device

H. Brombach & G. Weiss
A new broad-crested type of a wing-shaped overflow weir was developed and calibrated to meet the needs of monitoring combined sewer overflows in urban drainage systems. The main problem with existing sharp-crested weirs are hysteresis and inaccuracy at low overflow heads. The airfoil type weir shows a very broad measurement range from Qmin/Qmax of about 1/10,000. Rating curves calibrated in the hydraulic laboratory with and without upstream scumboards are introduced. The weir profile is bent...

OroClean

Jakob Parslov, Jeanne Lønstrup, Lærke Holstebroe, Trine Duelund Torstved & Burt Swersey
30% of all mercury pollution in the world comes from small-scale mining. This causes severe health and environmental damages. To eliminate the need for mercury in artisanal mining we have created a small-scale centrifuge that can separate gold from silt without using any chemicals. To heighten the efficiency fluidizational principles are integrated. The centrifuge can be produced at a low cost, which makes it feasible to set up a sustainable business model that will generate...

Constructive alignment (CA) for Degree projects – intended learning outcomes, teaching & assessment

Johan Malmqvist & Maria Knutson Wedel
In this paper, we focus on constructive alignment in the context of degree projects, and consider the following research questions: • Is CA applicable for degree projects? • Can the “aha” experience of working with CA for your own course be experienced by Degree project examiners/teachers? • Can CA for thesis projects contribute to higher quality? How? Why/why not?

Campaign Planning Tool results for three sites in complex terrain

Nikola Vasiljevic & Andreas Bechmann
This data collection contains designs for three dual-Doppler measurement campaigns in complex terrain.The designs are outputs of the Campaign Planning Tool (CPT). CPT was made to simplify the measurement campaign design process for multi-lidar systems.
The data collection contains three datasets, each corresponding to one individual complex terrain site.These three sites are denoted as:(1) Scottish site(2) Italian site(3) Turkish site

Campaign Planning Tool results for three sites in complex terrain

Nikola Vasiljevic, Andreas Bechmann, Andrea Vignaroli & Rozenn Wagner
This data collection contains designs for three dual-Doppler measurement campaigns in complex terrain.The designs are outputs of the Campaign Planning Tool (CPT). CPT was made to simplify the measurement campaign design process for multi-lidar systems.
The data collection contains three datasets, each corresponding to one individual complex terrain site.These three sites are denoted as:(1) Scottish site(2) Italian site(3) Turkish site

Campaign Planning Tool results for three sites in complex terrain

Nikola Vasiljevic, Andreas Bechmann, Andrea Vignaroli & Rozenn Wagner
This data collection contains designs for three dual-Doppler measurement campaigns in complex terrain.The designs are outputs of the Campaign Planning Tool (CPT). CPT was made to simplify the measurement campaign design process for multi-lidar systems.
The data collection contains three datasets, each corresponding to one individual complex terrain site.These three sites are denoted as:(1) Scottish site(2) Italian site(3) Turkish site

Enhancement of oil retention and biodegradation in pervious pavements and infiltration systems

T. Puehmeier, D. De Dreu, J.A.W. Morgan, A. Shuttleworth & A. P. Newman
This paper reports recent developments in oil trapping and oil biodegrading systems in pervious pavements and in infiltration systems used in conjunction with non-pervious surfaces. The advances made in the technology and operation of pervious surfaces fitted with an integrated oil water separator will be described. This involves a newly developed, floating mat system which serves to interact with any oil which, in the event of a large spill, passes through the initial oil retaining...

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