2,378 Works

Automatic calibration of a 3D groundwater model applied to the Muravera-Flumendosa coastal aquifer (SE Sardinia, Italy)

Giuditta Lecca, Pierluigi Cau, Federica Ardau & Giuditta Lecca
The performance evaluation of a groundwater model is a complex task due to the wide heterogeneity of hydrogeological properties, the scarcity of appropriate field data and the variability of boundary conditions. In this study an automatic calibration procedure has been developed and applied to the 3D groundwater model of the Muravera- Flumendosa coastal basin. The aquifer is threatened by seawater intrusion due to groundwater overexploitation and reduced replenishment. Aim of the study is to improve...

Unsaturated flow modeling in high-level nuclear waste repository

In the context of high-level nuclear waste repository safety calculations, the modeling of desaturation and saturation processes in low permeable porous media is of first importance. Indeed these processes are strongly coupled with mechanics, inducing host rock confinement properties changes. They also control corrosion and the other geochemical processes responsible for waste canister failure. Above all, desaturation and saturation time scales of the repository components determine the physicochemical behavior of the repository by trapping or...

Correlation Dimension as a Proxy for the Number of Parameters Required to Model Risk of Groundwater Arsenic Contamination: An Assessment Using Ordinary Logistic Regression

Faisal Hossain, Jason Hill & Faisal Hossain
The Correlation Dimension (CD) of an attractor provides information on the number of variables present in its non-linear deterministic variability. In this study we demonstrate a physical connection between the CD and the mathematical modeling of risk of arsenic contamination in groundwater using Ordinary Logistic Regression (OLR). Our database comprised the nation-wide arsenic survey completed in 1999 by the British Geological Survey (BGS) in collaboration with the Department of Public Health Engineering (DPHE) in Bangladesh,...

Learning during design through simulation

Pascal Béguin
This communication analyzes simulation as a method for learning during design, rather than a method for anticipates the future. More often, simulation is understood from as a “figurative” approach, centered on a future simulated situation. We will argue that an “operative” approach, centered on activity in a situation of simulation could be more efficient. Taking definitively this operative standpoint, the communication will propose three dimensions, each one contributing to an operative method: firstly, the simulated...

Optimization of Trailer Transport

Kasper Bislev Kallestrup & Jesper Larsen
20% of Europe’s GHG emissions come from road transportation. Freight transport energy consumption, and thus emission levels, is tightly coupled to GDP. So if Europe seeks to dramatically reduce emissions without sacrificing wealth, it is crucial to address the issue of energy efficiency within the road transportation sector. Today, empty journeys comprise 25%-40% of all road haulage. To address that issue the goal of this project is to describe and solve an optimization program that...

Atmospheric longwave radiation under cloudy skies for HAM simulation programs

Claudia Finkenstein, Peter Haeupl & Claudia Finkenstein
Atmospheric longwave radiation is one of the needed climatic boundary conditions in Heat-Air-Moisture (HAM) simulation programs. The paper presents principal procedures for the computation of atmospheric longwave radiation under clear and cloudy skies by means of simple near-ground weather data. Several approaches from literature have been calculated, compared and validated against measured data from Schleswig (D). For the clear sky data a new parameterisation has been found. Special attention has been paid to the determination...

Inter-ergonomist reliability in rating risk level - without any specific method - in ten video recorded work tasks

Mikael FORSMAN, Kristina ELIASSON, Ida-Märta RHEN, Teresia NYMAN, Per LINDBERG, Katarina KJELLBERG, Natalja BALLIU & Peter PALM

Explorative Evaluation of Cources

Lene Häuser Petersen, Bente Besenbacher & Jesper Rosholm Tørresø
Many course evaluations tend to focus on teacher performance and whether students like or don’t like the course or the teacher. An explorative evaluation method was developed and has been tested on both interdisciplinary projects and traditional introductory programming courses. The method focuses on how and when students learn during a specific course and which learning activities enhance the students learning. The students took an active part in the evaluations and the method facilitated that...

Adjoint symmetry for Inverse ADCIRC

Julia Muccino, Hao Luo, Boon Chua & Julia Muccino
ADCIRC, a finite element circulation model for shelves, coasts and estuaries, is used for weak constraint variational data assimilation. That is, data will be smoothed in space and time using ADCIRC and boundary conditions as a weak constraints; the smoother is defined in terms of a quadratic penalty functional which is composed of dynamic, boundary condition and data error terms. The assimilation will be effected by the Inverse Ocean Modeling system (IOM). This system solves...

ALLIANCES : Simulation Platform for Radioactive Waste Disposal

Philippe Montarnal, Alain Bengaouer, Clément Chavant, Laurent Loth & Philippe Montarnal
The safety assessment of nuclear waste disposals needs to predict coupled thermo-hydro-mechanical and chemical (T-H-M-C) processes, involving phenomena such as heat generation and transport (due to radioactive decay of nuclear waste), infiltration of groundwater (hydrological processes), swelling pressure of buffer material due to saturation (mechanical processes) and chemical evolution of buffer material and porewater (chemical processes). It appeared as necessary to develop and assess numerical tools that model these physical mechanisms. Therefore, the French Atomic...

Structures, ventilation and indoor air quality

Miimu Airaksinen, Hannu Viitanen, Helena Järnström & Miimu Airaksinen
Building structures and ventilation as well as their intercaction to the indoor climate

May an increased focus on students’ personal development contribute to increased motivation, better academic performance and teamwork in engineering programs?

Marie Bernelo, Sofia Honsberg, Anette Järelöw, Wolfgang Arendt, Jörgen Blennow, Peter Lundin & Lena Peterson
This paper presents work in progress and the results obtained from a development project on personal development performed as a part of a curriculum reform work. The goal is to give the students a clear view of the challenges and possibilities that the future role as engineer offers and prepare for the expectations put on the modern engineer such as being able to integrate personal, professional and interpersonal skills. The result of this study is...

A Serendipitous, Long-term Infiltration Experiment: Water and Radionuclide Circulation Beneath the CAMBRIC Trench at the Nevada Test Site.

Reed Maxwell, Andrew Tompson, Steven Carle, Mavrik Zavarin, Stefan Kollet & Reed Maxwell
Underground atomic weapons testing at the Nevada Test Site introduced numerous radionuclides that may be used to characterize subsurface hydrologic transport processes in arid climates. Beginning in 1975, groundwater adjacent to the CAMBRIC test, conducted beneath Frenchman Flat in 1965, was pumped steadily for 16 years to elicit experimental information on the migration of residual radioactivity through the saturated zone. Radionuclides in the pumping well effluent, including tritium, 36Cl, and 85Kr, were extensively monitored prior...

Analysis of Uncertainty in the Development of Integrated Solutions

Tabea Ramirez Hernandez, Melanie Kreye & Daniela Cristina Antelmi Pigosso

Planning an organizational simulation to support an integrated operation initiative in the oil and gas industry

Fausto MASCIA, Luciano GAROTTI, Francisco DUARTE & Eric MONTEIRO
An organizational simulation of an integrated operation initiative for logistics is planned to support this organizational project consisting of the implementation of a central collaborative environment and its satellite teams. The main driver of such simulation may be defined according to the ergonomic work analysis that highlights issues related to the mental representation of the logistic process, built by the collaboration between these distributed teams as a means of increasing the distributed situational awareness throughout...

Modelling the development of damage and aging of buildings for moisture risk and service life analyses

Tuomo Ojanen, Hannu Viitanen, Ruut Peuhkuri & Tuomo Ojanen
Moisture damages and failures in buildings are caused by hygrothermal conditions exceeding the tolerance of structures. In building materials these conditions may lead to the growth of microbes or mould and decay fungi after a critical exposure time. The microclimate is the acting force for biological deterioration of materials. Microclimate condition is a result of several simultaneous vectors: macroclimate (rainfall, temperature, humidity, air pressure conditions etc.), meso-climate (location of the building, building structures and details...

Numerical Evaluation of Multicomponent Cation Exchange Reactive Transport in Physically and Geochemically Heterogeneous Porous Media

Javier Samper, Changbing Yang & Javier Samper
Sophisticated deterministic numerical models have been developed during the last two decades for the analysis of multicomponent reactive solute transport. Most of these models account for spatial heterogeneity by parameter zonation. Most stochastic analyses of reactive transport in physically and geochemically heterogeneous porous media consider a single reactive species. Attempts have been made recently for the stochastic analysis of multicomponent reactive species which rely on simplifying assumptions. Given the lack of theoretical stochastic analyses of...

Teaching Interpersonal Skills in International Design-Build Course

Jørgen Erik Christensen & Markku Karhu
This paper is based on our experiences and benefits from the international CDIO Co-operation between Denmark and Finland. Much work has been put into techniques to support group dynamics in an international environment and evaluation. Teaching methods for learning interpersonal skills have been developed in an interactive environment, where the students make their own experiences through active involvement in exercises in groups of two to four persons. The developed principles will be used in a...

The CDIO as an Enabler for Graduate Attributes Assessment in Canadian Engineering Schools

Bob Brennan & Ron Hugo
In this paper, we describe the process that is being followed at the Schulich School of Engineering to address the Canadian Engineering Accreditation Board’s new graduate attributes criterion, and show how the CDIO syllabus can play an integral role in this process.

The integrated curriculum of TU Delft Aerospace Engineering

Aldert Kamp
The new curricular framework Aerospace Engineering of Delft University of Technology has it all: state-of-the-art content that is interwoven with thematic design projects and trainings for personal and system building skills, international standard text books, up-to-date teaching methods, excellent facilities, with a focus on the aircraft and spacecraft throughout the bachelor and master programme. During his visit to the Faculty of Aerospace Engineering in April 2009 David C. Wisler of CDIO stated: “…This curriculum is...

Solfangere belyst ved matematik

Andreas Gram Sørensen, Casper Vestergaard Nissen, Jacob Stilling Nørregaard, Jens Steemann Kristensen, Lasse Tidemann, Søren Wrang, Carsten Schmidt & Connie Ørbæk
This Project uses mathematical methods to analyse solar collectors. There are made some assumptions to make things easier but without too many changes it can easily be made more realistic. The project ends up with a couple of methods for finding the total energy intake of a solar collector. Some of the methods are easier to handle but harder to calculate. Finally the project analyses some examples that relate to the real life and it...


Anne Katrine Falk, Michael B. Butts, Henrik Madsen, Johan Hartnack & Anne Katrine Falk
Ideally, real-time flood management decisions must be based on an understanding of the uncertainties and associated risks. It is therefore central for effective flood management tools to provide reliable estimates of the forecast uncertainty. Only by quantifying the inherent uncertainties involved in flood forecasting can effective real-time flood management and warning be carried out. Forecast uncertainty requires the estimation of the uncertainties associated with both the hydrological model inputs (e.g. precipitation observations and forecasts), model...

A concept for a bachelor program in electrical engineering

Henrik Niemann
The main concept for the Bachelor of Science in Engineering (BScE) in electrical engineering at Technical University of Denmark (DTU) will be described in this paper. A new curriculum was introduced from the start of the autumn semester in 2010. The curriculum was the result of more than one year of work with first description of competences followed by a more detailed description of the single main areas. Finally, the new study plan was implemented...

iPhone application to support commuters

Johan Van Beusekom, Lars Libak Pedersen, Peter Gammelgaard Poulsen & Jakob Eg Larsen
A great deal of today’s CO2 emissions comes from cars. A way to reduce these emissions is by making people drive together instead of going alone. With our project we are creating a simple application for iPhone that will allow people to carpool easily. The application is convenient since a smartphone is something that you always carry with you. The application lets the user create and request rides and announce this on Facebook or Twitter.

System Engineering in Senior-Design Capstone Projects

Kevin W. Rudd, Jennifer K. Waters, Duncan O'Mara, Christoph J. Flaherty & Michael Janssen
USNA is participating in the Systems Engineering Research Center RT-19 research project to develop systems engineering talent in the workforce. RT-19 is focused on developing solutions to real-world problems emphasizing the development and application of systems engineering skills and methods. Our RT-19 participation includes sixteen students, three departments, and four design projects. Each design project is developing a functioning artifact that could be delivered as a prototype. At CDIO, we will provide a full accounting...

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