2,901 Works

Darcy multi-domain approach for integrated surface/subsurface hydrologic models

Sylvain WEILL, Emmanuel MOUCHE & Sylvain WEILL
A Darcy multi-domain approach for modeling surface and subsurface hydrologic processes is presented. The diffusive wave approximation is used to model runoff. The resulting equation is formulated as a Darcy nonlinear one. Therefore, the water dynamics in the three physical domains, ground surface, vadose zone and saturated zone, is described through a single Darcy nonlinear equation with domain-dependent parameters. This multi-domain Darcy equation is solved with Mixed Hybrid Finite Element formulation. The time discretisation is...

A Triple-Continuum Numerical Model For Simulating Multiphase Flow in Vuggy Fractured Reservoirs

Zhijiang Kang, Yu-Shu Wu, Jianglong Li, Yongchao Wu, Jie Zhang, Guangfu Wang, Zhijiang Kang & Yu-Shu Wu
The existence of vugs (empty holes or cavities) in naturally fractured reservoirs has long been observed and can be contributed significantly to reserves of underground natural resources, such as oil, natural gas, and groundwater. A new multi-continuum conceptual model has been developed for investigating multiphase flow behavior through vuggy fractured reservoirs. The conceptual model, based on geological data and observations of core examples from carbonate formations in China, has been implemented into a three-dimensional, three-phase...

Remote Sensing of Offshore Winds for Wind Energy Applications

Tobias Torben Ahsbahs
Winds in the coastal zone are variable due to sudden changes of the meteorological conditions caused by the land-sea transition. Near-shore areas are, however, attractive for installation of offshore wind farms because of the shallow waters and the proximity to logistics on land. Accurate information about winds in the coastal zone is necessary for optimizing the positioning and layout of wind farms. The PhD project explores the potential of new remote sensing techniques for mapping...

Modelling of Wind Power under Stressed Voltage Conditions

Moumita Sarkar

SAR wind atlas US East Coast

Tobias Torben Ahsbahs & Merete Badger
Synthetic Aperture Radar derived wind atlas for the US East Coast. Data contains mean wind speed at 10m, Weibull parameters, Energy density, and number of samples. The wind speed is calculated as a monthly mean and a seasonal corrected mean wind speed.

SAR wind atlas US East Coast

Tobias Torben Ahsbahs & Merete Badger
Synthetic Aperture Radar derived wind atlas for the US East Coast. Data contains mean wind speed at 10m, Weibull parameters, Energy density, and number of samples. The wind speed is calculated as a monthly mean and a seasonal corrected mean wind speed.

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The influence of surface treatment on mass transfer between air and building material

Jerzy Kwiatkowski, Carsten Rode, Kurt Kielsgaard Hansen, Monika Woloszyn, Jean-Jacques Roux & Jerzy Kwiatkowski
The processes of mass transfer in the material influence not only the conditions within the material but also inside the connected air spaces. The relative humidity is one of the most important parameters influencing perceived indoor air quality and the human comfort. Moisture can also initiate microbiological growth at the surface of building envelope. The material which absorbs and desorbs water vapour can be used to moderate the amplitude of indoor relative humidity and therefore...

Sammenhænge mellem Produktivitet og Psykosocialt Arbejdsmiljø, SaPPA : Afslutningsrapport til Arbejdsmiljøforskningsfonden

Kasper Edwards, Niels Møller, Tage Søndergaard Kristensen, Herman Burr & Jan Hyld Pejtersen

Evalueringsrapport i projekt ”Fra begreb til bundlinje - hvordan øger vi den relationelle koordinering?”

Kasper Edwards

Enabling Technologies for Cognitive Optical Networks

Robert Borkowski

Assessing the Impact of Climate Change on the Hydrology of the Upper Mississippi River Basin

Eugene Takle, Manoj Jha, Christopher Anderson, Phil Gassman & Eugene Takle
Recent observations and modeling suggests acceleration of the hydrological cycle at high latitudes in the Northern Hemisphere and that extreme intense precipitation events were more frequent over the last 30 years of the twentieth century. Assessments of local and regional impacts of changes in the hydrological cycle in future climates call for improved capabilities for modeling the hydrological cycle and its individual components at the subwatershed level. We have evaluated the impact of climate change...

Abstract book - 9th NOVO Symposium, Quality in health care

Beate André, Frode Heldal & Kasper Edwards

Using 2D and 3D models as tools during a workplace design process - a question of how and when

Lars-Ola BLIGÅRD, Cecilia ÖSTERMAN & Cecilia BERLIN
The benefits of involving users in a development process are well described. This paper describes a procedure for using 2D and 3D models in a workplace design process, which is based on three rounds of user studies within the maritime domain. The process includes various kinds of models that can be used in order to elicit design feedback in a cost-effective manner. Design teams can greatly benefit from using such mediating objects to draw out...

Energy Harvesting: Computing without Batteries

Johan Pedersen, Jan Madsen & Thomas Sørensen
Wireless sensor networks, where a large number of small sensing and computing devices are deployed in the environment, enables remote sensing and monitoring of climate and environmental conditions within a potential large area which can be in the outdoor environment as well as indoor in buildings. When applied in buildings, a more efficient monitoring of temperature, airflow, lighting, humidity, etc. will not only allow a better indoor climate, but also reduce the amount of energy...

Work environment, Lean and agriculture

Karin ANDERSSON & Jörgen EKLUND
Lean has become the predominant management concept in industry, but its effect on the work environment is debated. Lean has now reached farms and garden nurseries. This paper aims to identify consequences for the physical and psychosocial work environment when Lean was applied in micro-businesses in the agricultural sector. Observations, a questionnaire and interviews were used as methods. It was concluded that the psychosocial work environment became more structured and less stressful. The physical work...

Energy Harvesting: Computing without Batteries

Johan Pedersen, Jan Madsen & Thomas Sørensen
Wireless sensor networks, where a large number of small sensing and computing devices are deployed in the environment, enables remote sensing and monitoring of climate and environmental conditions within a potential large area which can be in the outdoor environment as well as indoor in buildings. When applied in buildings, a more efficient monitoring of temperature, airflow, lighting, humidity, etc. will not only allow a better indoor climate, but also reduce the amount of energy...

Constraining coastal aquifer models by hydrogeophysical imaging of seawater intrusion dynamics: a case study from the Lower Andarax delta, SE Spain

Richard Ogilvy, Oliver Kuras, Frederic Nguyen, Andreas Kemna, Philip Meldrum, Juan Gisbert, Sara Jorreto, Francisco Sanchez Martos, Antonio Pulido Bosch, Peter Engesgaard, Arni Antonsson, Karsten Jensen & Oliver Kuras
Appropriate characterisation, modelling and management of coastal aquifers requires knowledge of the dynamic balance between freshwater and saltwater present in the aquifer as a result of natural marine intrusion or other salinisation processes of geological or anthropogenic origin. Monitoring this balance is essential for the timely detection and prediction of groundwater deterioration and the sustainable management of abstraction schemes. Recent advances in hydrogeophysical methods allow more accurate non-invasive assessments of intrusion dynamics and evolution, thus...

Approaching the Groundwater Remediation Problem Using Multifidelity Optmization

Kathleen Fowler, Genetha Gray & Genetha Gray
The objective of the hydraulic capture method for optimal groundwater remediation design is containment of a contaminant plume using barrier wells to reverse the direction of groundwater flow. Finding a solution involves applying optimization algorithms in conjunction with simulators for groundwater flow and possibly for contaminant transport. The formulation of the objective function and its corresponding constraints dictates which optimization algorithms are appropriate and usually eliminates gradient based approaches from consideration. In addition, objective functions...

Approaching the Groundwater Remediation Problem Using Multifidelity Optmization

Kathleen Fowler, Genetha Gray & Genetha Gray
The objective of the hydraulic capture method for optimal groundwater remediation design is containment of a contaminant plume using barrier wells to reverse the direction of groundwater flow. Finding a solution involves applying optimization algorithms in conjunction with simulators for groundwater flow and possibly for contaminant transport. The formulation of the objective function and its corresponding constraints dictates which optimization algorithms are appropriate and usually eliminates gradient based approaches from consideration. In addition, objective functions...

Avicore - aviation bio-fuel

Anne Sophie Vinther Hansen, Bjørn Øst Hansen, Louise Pierrel, Monika Luniewska, Theis Brock-Nannestad & John Heebøll
The Avicore Fuel System is a novel high-value aviation bio-fuel solution, produced by a multiple biological-chemical process. The main steps can be divided into a synthetic-biological one (synthesizing the intermediate) and a catalytical one. What we propose is a process where algae and agricultural- and slaughter wastes are used as the feedstock for a genetically modified organism. It will be modified to produce longer alcohols, both branched and linear, as required by the specific application....

Wind-up system for a Lever Operated Pivoting Float-Buoy

A. A. Frederiksen, A. G. Andersen, K. J. Juul, M. L. Bernitt, P. R. Nielsen & R. Katkjær
INTRODUCTION The project that this abstract revolves around is being prepared in connection with the course Project Work (41801) and focuses on the construction of a wind-up system for a Lever Operated Pivoting Float-buoy (LOPF) in cooperation with Resen Waves. The purpose of the buoy is to transform energy from waves in the ocean to electrical energy. The system is put in place to allow for the buoy to move with the waves in the...

Optimizing production cost using ergonomic data

W. Patrick NEUMANN, Ahmad SOBHANI & M.I.M WAHAB

Avicore - aviation bio-fuel

Anne Sophie Vinther Hansen, Bjørn Øst Hansen, Louise Pierrel, Monika Luniewska, Theis Brock-Nannestad & John Heebøll
The Avicore Fuel System is a novel high-value aviation bio-fuel solution, produced by a multiple biological-chemical process. The main steps can be divided into a synthetic-biological one (synthesizing the intermediate) and a catalytical one. What we propose is a process where algae and agricultural- and slaughter wastes are used as the feedstock for a genetically modified organism. It will be modified to produce longer alcohols, both branched and linear, as required by the specific application....

Characterization of nanoporous gold electrodes

Erol Zekovic & Xueling Quan
This project investigates the use of nanoporous gold microelectrodes for detection of heavy metals in ground water. By the use of electrochemistry, the change in impendance by adjusting parameters as etching time and poresize, is determined.

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