2,413 Works

Fabrication of biopolymer cantilevers

Nikolaj Feidenhans'l, Nis Fisker-Bødker & Stephan Keller
With our novel production method biopolymer micro cantilevers can be manufactured cheap and easily, rendering the measurement of degradability a matter of a few days. Our micro cantilevers are made of the PLLA (poly-l-lactide), measure 100 x 500 x 10 µm (width, length, height) but are positioned on a supporting body chip to allow handling with tweezers. As biopolymers are to fragile to process with standard silicon techniques we developed a fabrication method using nanoimprint...

Reduction of pollution load from street-runoff by an inlet-filtration-system filled with adsorptive material

H. Sommer & H. Sieker
Pollution of surface waters by runoff from sealed areas is coming more into focus. As shown by several national and international studies, this part of wastewater cannot be neglegted. There are different strategies to reduce emission from urban runoff. One is to reduce the pollution load to rivers and lakes by centralised retention, purification tanks and centralised constructed wetlands. An alternative strategy is source control. The presented solution in this paper concerns the thousands of...

Associations between physically demanding work and life-style: results from the Swedish WOLF study


A field observatory in urban drainage: the OTHU project \342\200\223 a five year experience

B. Chocat, L. Bacot, S. Barraud, P. Breil, F. Malard, J.C. Varnier & T. Winiarski
OTHU is an on-site observatory that aims to study the different processes encountered all along the urban water cycle associated with urban drainage. The OTHU project is also a research organisation comprising fifteen research laboratories working in a wide range of complementary fields including geography, climatology, hydrology, soil mechanic, soil science, hydraulic, chemistry, biology, social sciences, and economy. The research project is based on data acquisition from 5 sites where continuous monitoring of climatic parameters,...

Indicators of hazard, vulnerability and risk in urban drainage

M. B. Hauger, J.-M. Mouchel & P.S. Mikkelsen
An alternative definition of risk is proposed as risk being a function of the hazard, which is related to the risk source and the vulnerability, which is related to the risk object. The same hazard will not cause the same effect on all risk objects. Therefore vulnerability is introduced as a system dependant property to be the link between the hazard and the effect so that the combination of the occurrence of a hazard and...

Evidence on dynamic effects in the water content - water potential relation of building materials

Gregor Scheffler, Rudolf Plagge & Gregor Scheffler
Hygrothermal simulation has become a widely applied tool for the design and assessment of building structures under possible indoor and outdoor climatic conditions. One of the most important prerequisites of such simulations is reliable material data. Different approaches exist here to derive the required material functions, i.e. the moisture storage characteristic and the liquid water conductivity, from measured basic properties. The current state of the art in material modelling as well as the corresponding transport...

Does physical activity at work impact physical activity behavior in leisure time?


Planning for urban floods in Sweden: the situation in Kristianstad

D. Thorsteinsson, A. Semadeni-Davies & R. Larsson
The physical planning process with respect to urban flood risk in Sweden is currently at the forefront of public perception following several floods in urban areas over recent years. The Swedish planning process has a four-tiered hierarchy covering a range of spatial scales from larger scale comprehensive plans to individual building permits; generally, the smaller the area, the tighter the planning required to manage flooding. There is a judicial vacuum when it comes to who...

Numerical Aspects of Density Driven Flow in Porous Media

Klaus Johannsen & Klaus Johannsen
The analysis as well as the numerical simulation of density driven flow in porous media is still a challenging task. Whereas thorough theoretical investigations are limited to special situations, the numerical treatment, especially of real-world problems, requires special numerical techniques. In this talk we focus on two aspects, which are relevant in this context. The first deals with the design of robust multigrid solvers for problems with high spatial anisotropies. In the second part, we...

A control center design revisited: learning from users’ appropriation

This paper aims to present the lessons learned during a control center design project by revisiting another control center from the same company designed two and a half years before by the same project team. In light of the experience with the first project and its analysis, the designers and researchers had important feedback already used to suggest changes for the second project. The opportunity to learn from a previous project was unique, but the...

Co-operation of inhabitants and public authorities

E. Jacobs
In the Netherlands as a low-lying country, high groundwater tables cause problems in some houses. The actual cause of these problems is different in different cases, but a problem is always that the responsibilities are complex. The official policy is that not only there is a responsibility for the public bodies; also the owners of the houses themselves have a responsibility. From the point of view of the inhabitants however, high groundwater tables are something...

Thermal, moisture and microbiological boundary conditions of slab-on-ground structures in cold climate

Jukka Rantala, Virpi Leivo & Jukka Rantala
Ground slabs and basement walls are a unique part of building envelope in direct and constant contact with the subsoil stratum or the constructed fill layers. The coarse-grained fill or drainage layer beneath a slab forms an outmost segment of this envelope preventing free capillary or gravitationally waters from penetrating the adjoining structural elements. Thermal and moisture conditions in these layers form the boundary conditions of ground slabs as far as the building physics of...

Optimizing production cost using ergonomic data


Domain decomposition for a fractured porous medium

Laila Amir, Michel Kern, Vincent Martin, Jean Roberts & Laila Amir
This presentation concerns flow in a porous medium with one or more faults or fractures. In the model to be presented the fractures are treated as interfaces between neighboring subdomains. Then a domain decomposition method, in which the transmission conditions are continuity of the pressure and Darcy flow along the n-1 dimensional fracture interface, is formulated. In an earlier article the model for a domain with a single fracture was defined, existence and uniqueness of...

Phenomenological modeling of wastewater treatment plant influent disturbance scenarios

K. V. Gernaey, C. Rosen, L. Benedetti & U. Jeppsson
Deterministic wastewater treatment plant (WWTP) models are useful for simulation-based evaluation of design, upgrade and control alternatives on WWTP performance. However, due to high requirements of measurement campaigns in terms of time and economic resources, many simulation studies suffer from the limited availability of long influent flow rate and concentration time series representing realistic influent disturbance scenarios. In this paper, a phenomenological modeling approach for generation of WWTP influent disturbance scenarios is proposed, with focus...

Culture in engineering education - CDIO as a frame for developing intercultural competences

Birgitte Hoffmann, Ulrik Jørgensen & Hans Peter Christensen
As engineers today often work in intercultural projects and contexts, intercultural compe-tences must be part of the learning objectives in engineering educations. This is in line with the CDIO programme; however, the programme, as well as the teach-ing practises, undoubtedly needs to further develop approaches to cultural aspects in engineering education. Hence the key-question of this paper is how CDIO support the development of intercul-tural competences in engineering education, and the paper explores the implementation...

Development and benchmarking of a newly developed whole building hygrothermal model

Fitsum Tariku, Kumar Kumaran, Paul Fazio & Fitsum Tariku
In this paper, the development and benchmarking of a newly developed whole building hygrothermal model are presented. The model considers the building as a system and accounts for the dynamic heat, air and moisture (HAM) interaction between building envelope components and indoor environmental conditions including HVAC systems, moisture and heat sources. The methodology adapted in this work is to develop and validate two primary models: building envelope and indoor models independently and couple them to...

Influences of the indoor environment on heat, air and moisture conditions in building components: Boundary conditions modeling

Paul Steskens, Carsten Rode, Hans Janssen & Paul Steskens
Current models to predict heat, air and moisture (HAM) conditions in building components assume uniform boundary conditions, both for the temperature and relative humidity of the air in an indoor space as well as for the surface transfer coefficients. Such models cannot accurately predict the HAM conditions in the component with non-uniform air temperature or relative humidity distributions in an indoor space. Moreover, the heat and moisture surface transfer coefficients strongly depend on the local...


Elinor Edvardsson Stiwne & Ann-Sofie Bergeling
In 1999 Linkoping University started a collaboration between MIT, Chalmers and KTH with the aim of developing engineering. This was the start of the CDIO initiative. In 2002 the first cohort of students in the study program of Applied Physics and Electrical Engineering (Y-program) entered into a program designed to meet the requirements of a CDIO syllabus. A CDIO project course was introduced the first semester and an elaborated project course delivered in year three...

Multi-Scale Approach for Multi-Phase Flow in Porous Media Using Stochastic Particles

Patrick Jenny, Manav Tyagi, Hamdi Tchelepi, Evan Lunati & Patrick Jenny
Particle methods have been investigated extensively for single-phase tracer transport in porous media. However, these conventional particle methods are unable to describe the correct non-linear macroscopic flux observed in immiscible multi- phase flow. Here we present an alternative particle approach. The methodology is based on transporting the particles according to statistical rules consistent with the small-scale physics in pores and throats. The input to the model describing the fluid particle dynamics includes the distribution functions...

Positivity problem and reactive transport simulation in porous media

Christophe Le Potier, Alain Genty & Christophe Le Potier
During the last decade, a large amount of work has been done in reactive transport modeling in porous media leading today to geochemical transport codes based on the coupling of transport models and geochemistry modules. In the framework of high-level nuclear waste repository safety calculations, we developed such a code with the numerical platform ALLIANCES allowing the coupling of several classical transport codes (Porflow, MT3D, Traces, Cast3m) and geochemistry modules (PhreeqC, Chess). In order to...

Variational data assimilation of lagrangian data for fluvial hydraulics simulations.

Marc Honnorat, François-Xavier Le Dimet, Jérôme Monnier & Marc Honnorat
A major difficulty in the simulation of river hydraulics flows is bound to model parameters definition. Solutions of the shallow water equations are determined by initial conditions, boundary conditions, bed elevation, physical and numerical parameters. Data assimilation methods make it possible to combine optimally physical information from the model and observation data of the physical system to identify the value of model inputs that correspond to a numerical simulation which is consistent with reality. Variational...

An Integrated Media, Integrated Processes Watershed Model – WASH123D: Part 1 – Model Descriptions and Features

Guobiao Huang, Fan Zhang, Lin, Hsin-Chi (Jerry), Cheng, Jing-Ru (Ruth), Earl V. Edris, David R. Richards, Yeh, Gour-Tsyh (George), Cheng, Hwai-Ping (Pearce) & Yeh, Gour-Tsyh (George)
Parametric-based, lumped watershed models have been widely employed for integrated surface and groundwater modeling to calculate surface runoff and pollution loads on various temporal and spatial scales of hydrologic regimes. Physics-based, process- level, distributed models that have the design capability to cover multimedia and multi-processes and are applicable to various scales have been practically nonexistent until recently. It has long been recognized that only such models have the potential to further the understanding of the...

Australian rainfall & runoff - Guiding Australian practice into the 21st century

J. E. Ball & B. C. Phillips
Since 1958 when Australian Rainfall and Runoff was first released it has remained one of the most influential and widely used guidelines published by Engineers Australia. The current edition, initially published in 1987 and in a split book form in 1998, has received widespread Australian and international acclaim. The issues of environment sustainability and water conservation are increasingly requiring the application of updated or new engineering hydrology techniques. Consequently a new updated and revised edition...

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