2,430 Works

Algae Microculture System

Søren Matthias Goldschmidt, Maciej Skolimowski & Kristian Mølhave
This project develops a micro fluidic system for trapping algae in microchambers. The system comprises chambers, valves with a membrane as lock, and filters to provide a growth medium. Membrane strength, stability, deflection, thickness and filter types is studied. When deflection increases, thickness decreases. An applied pressure in the membrane decreases exponentially with time to a pressure above ambient pressure. The relation between the pressure where the growth medium leak through the valve and membrane...

Behavior of the activated storage-volume of flushing waves on cleaning performance

J. Dettmar & P. Staufer
Deposits build up in sewer networks during both dry-weather and storm-water events. Especially in combined sewers, the sediment materials cause various undesirable effects. Flushing devices are able to remove deposits in sewers by generating flushing waves. To optimize the flushing with so called Storage-Volume-Activated-Devices (SVAD) numerical studies were carried out. The objective was to investigate the behaviour of the activated storage-volume of flushing waves on cleaning performance.

Improving the sustainability of on-site detention in urban catchments

B.C. Phillips, A.G. Goyen & S.J. Lees
The upper catchment of the Parramatta River is one of the most urbanized catchments in Sydney and Australia. The Upper Parramatta River Catchment Trust (UPRCT) was established in 1989 to address the impacts of urbanization on flooding in the 110 km2 catchment. An On-Site Detention (OSD) policy was adopted by the UPRCT in November 1991 and has been applied to all new developments in the catchment since that time. The Trust has also published a...

Introducing Chip Design using Speed of Light

Stefan Schlotterbeck-Macht, Konrad Doll & Ulrich Brunsmann
We present a novel didactical concept for undergraduate teaching of microelectronics based on an experiment using a CMOS cyclic pulse-shrinking time-to-digital-converter (TDC) in order to directly measure the speed of light. The experimental setup, the didactical concept of teaching the TDC operating principle, an example realization of a TDC for didactical purposes and an actual research application are described. Our concept fits into the CDIO framework with emphasis on design-build experience and on project-based learning...

Super-light Structures

Birgit Astrid Pedersen, Kasper Laurits Krag Nielsen, Maria Skovgård Møller & Kristian Hertz
The project is based on the Vejlefjord bridge, which is a cantilever concrete bridge. The bridge functions as a part of the highway running from north to south in Jutland, running east of Vejle. It spans 1712m, is 26.7m wide and has 110m between the pillars. The main purpose of this project is to compare the original bridge with a similar bridge constructed in superlight concrete. The comparison is divided into two parts. First we...

Measurements and simulations of moisture in naturally ventilated barns in cold climates

Thomas Thiis & Thomas Thiis
ABSTRACT: New demands in farming industry in Norwegian sub-arctic regions have caused a need for larger animal buildings. To minimize the cost of the buildings, they are built without insulation. Uninsulated animal buildings in cold climates raise many new engineering challenges. Because of the lack of insulation, the walls of the buildings are exposed to a high risk of condensation. This is met with a high ventilation rate to remove the excess moisture. To monitor...

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...

Sustainable urban drainage and public participation in Albertslund, Denmark

H. H\303\270g, S. Gabriel, A. Henze & M. Krayer Von Krauss
In the city of Albertslund, Denmark, the rainwater collection system has been designed with two goals in mind: i) evacuating and filtering runoff rainwater, and ii) developing rainwater detention ponds of a high aesthetic and recreational quality. The ponds have been the focus of much public attention, and there is little tolerance for pollution of the ponds by metals and oils. Thus, management of the ponds has been a high priority issue for the municipality...

Integrated water resources modeling tools with data management

Hamidreza Eslami, Mahin Jamali, Kourosh Qaderi, Mostafa Shokrolah Mirzaee & Hamidreza Eslami
A tools box named Jamab Application System (JAS) is presented in this study for integrated management of water resource projects in Iran. It is comprehensive software which may be applied to conjunctive management of groundwater and surface water resources, reservoir operation, flood warning systems and provision of databases. JAS has been developed through the research and practical projects performed in the research and development department of Jamab consulting engineers company. It is a flexible decision...

Laboratory and project based learning in the compulsory course Biological Chemistry enhancing collaboration and technical communication between groups

Yvonne Agersø, Anette Bysted, Lars Bogø Jensen & Mathilde Hartmann Josephsen
Biological Chemistry is a 2nd semester course. A practical/theoretical project concerning antimicrobial resistance in retail meats was introduced. The students work in groups each responsible for a subtopic. All groups collect meat samples based on criteria defined in the class. The samples are subjected to the same set of experiments. Results are shared between groups; meaning that the groups do not present their own results, but results related to their topic on behalf of the...

Workplace needs and experiences of university staff

Virpi RUOHOMÄKI, Marjaana LAHTINEN, Annu HAAPAKANGAS & Kari REIJULA
Workplaces of universities are changing. The study analyzed and identified work, workplace needs and experiences of university staff at the beginning of a broad building renovation. The university staff was profiled with different tasks, work specific needs and space requirements. The facilities supported well independent, individual tasks, but less collaboration and teamwork. The identified problems were related to the quality of indoor air, temperature and acoustics. The staff participated in workplace design through workshops. They...

Integrated modelling of two xenobiotic organic compounds

E. Lindblom, K. V. Gernaey, M. Henze & P. S. Mikkelsen
This paper presents a dynamic mathematical model that describes the fate and transport of two selected xenobiotic organic compounds (XOCs) in a simplified representation of an integrated urban wastewater system. A simulation study, where the xenobiotics bisphenol A and pyrene are used as reference compounds, is carried out. Sorption and specific biological degradation processes are integrated with standardised water process models to model the fate of both compounds. Simulated mass flows of the two compounds...

Work related musculoskeletal disorders among physiotherapists

Deepak SHARAN, Mathankumar MOHANDOSS, Rameshkumar RANGANATHAN, Jerrish JOSE & Joshua Samuel RAJKUMAR
The main aim of the study was to review the current literature in order to know various measurement tools used, ergonomic risk factors and other finding related to work related musculoskeletal disorders (WRMSD) among physiotherapists. A systematic review was done using MEDLINE by the keywords “physiotherapists”, “ergonomics” and “musculoskeletal disorders”. Articles were reviewed by two reviewers and studies which were not adequate and inappropriate were excluded. Prevalence of WRMSD in the selected studies was reported...

Sustainable playground

Anne Mette Vraa, Kirsten Vraa & Niels Henrik Mortensen
This project is based on developing children and youngsters understanding of energy production. We wish to create a playground that challenges children’s way to play and makes it exciting and rewarding to play. While playing we want to give the children an idea of what it takes to produce energy. Through this we hope to make them appreciate energy and affect them in their daily use of it. Ideas on how a sustainable playground can...

Riemann Problems for a new class of equations modeling steam injection with applications in groundwater remediation.

Wanderson Lambert, Dan Marchesin & Wanderson Lambert
Groundwater contamination by organic materials and petroleum products is a preoccupying problem with environmental, social and health implications constituting a menace to our high-quality groundwater resources. An important remediation technique is steam injection. The model that we propose to describe this injection is a balance system, because it considers the terms of mass transfer and chemical reactions in the different physical phases. We have developed techniques to solve the Riemann problems associated to the balance...

Parallelization of the WASH123D Code—Phase III: 1-Dimensional Channel, 2-Dimensional Overland, and 3-Dimensional Subsurface Flows

Jing-Ru Cheng Cheng, Robert Hunter, Hwai-Ping Cheng, David Richards & Jing-Ru Cheng Cheng
Watershed models are used to simulate and predict major hydrological processes, such as surface or subsurface flows, which may occur on different spatial domains and temporal scales. A key feature of watershed models is the ability to model interactions among different processes and domains. Such interactions can be strongly or weakly coupled depending on the relevant time scales for each process. WASH123D is a first-principles, physics-based model for simulating a coupled system of channel flow,...

Passive climate control in museums and archives

Tim Padfield & Poul Klenz Larsen
In recent years the specification for the climate in museums and archives has become so strict that air conditioning has to be installed, though the scientific evidence of the need for such constancy of climate is very thin. The standards are rather based on what the best available technology can achieve, regardless of energy use and the need for constant surveillance of the equipment. Going to the opposite extreme, some buildings with no air conditioning...

Hands-On Education at Kanazawa Technical College

Michio Tennichi, Hirofumi Yamada, Hiroshi Matsui, Shigehiko Furuya, Kouhei Ito, Ryo Kanai & Anastasia Rynearson
Kanazawa Technical College has a tradition of working with industry and the community in order to improve education. This paper introduces Kanazawa Technical College and describes the hands-on project courses at every year level that have been developed though a government grant. The courses are also being evaluated against the CDIO Standards and Syllabus, and will be modified based on the evaluations.

Pollutant removal efficiency of alternative filtration media in stormwater treatment

N. Seelsaen, R. McLaughlan, S. Moore, J.E. Ball & R. M. Stuetz
ABSTRACT Sorption experiments were used to assess the ability of various materials (sand, compost, packing wood, ash, zeolite, recycled glass and Enviro-media) to remove heavy metal contaminants typically found in stormwater. Compost was found to have the best physicochemical properties for sorption of metal ions (Cu, Zn and Pb) compared to sand, packing wood, ash, zeolite and Enviro-media. The compost sorption of these metal ions conformed to the linear form of the Langmuir adsorption equation...

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...

Towards optimal experimental design in hydrogeophysical studies

J.A. Huisman, T.P.A. Ferre, A. Kemna, H. Vereecken & J.A. Huisman
Hydrogeophysics attempts to combine multiple geophysical data sources to better constrain hydrological models of the subsurface. It is generally recognized that such data fusion attempts will be computationally demanding. Sophisticated (hydrogeophysical) inversion methods are one potential way to reduce the computational burden. Methods to reduce the number of measurements by avoiding redundant information (optimal experimental design) could also contribute to such a reduction. Such an optimisation of the experimental design requires that the quality of...

The social impacts of stormwater management techniques

S. Apostolaki, C. Jefferies & T. Wild
This paper presents the results of research into the social impacts of stormwater management techniques applied within urban environments. The main aim of the study was to compare public and professional attitudes of stormwater management practices such as Sustainable Urban Drainage Systems (SUDS) and river management techniques. Any new and innovative technology used in residential areas, besides being economically and environmentally acceptable, must also be accepted by the residents. There has been considerable interest in...

Adaptive Lattice Boltzmann simulations of free-surface flows

Jonas Toelke, Manfred Krafczyk & Jonas Toelke
Recently Lattice-Boltzmann (LB) methods have matured as complementary models and simulation approaches for solving complex flow problems in engineering. In our work we extend an existing laminar free surface LB model recently developed by Koerner et al. by a Large Eddy model to describe turbulent flows and validate our model by threedimensional computations of a rigid body impact on a shoreline and the resulting wave generation. The results are compared to experimental and numerical data...

Reliability and safety of sewer system

D. Stransky & P. Fatka
Knowledge of the hydraulic reliability and safety of the gravity sewer system is important for nearly all actors of urban drainage. The main goal of the presented project was to develop a methodology enabling flexible, simple, complex and transparent assessment of hydraulic behaviour of the sewer system. The methodology allows to perform an assessment related to different functional regimes (e.g. pressure flow, surface flooding) as well as to different spatial (manhole-sewer system) and temporal scales...

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