Now showing items 1-20 of 102

    • 25-years Svalbard data record reveals change in long-range transport of sulphur agents to the warming Arctic 

      Dekhtyareva, Alena (Conference object, 2019)
      Current study investigates the 25-years seasonal trend in the concentration of SO2and non-sea salt SO42-and compares observed changes with the evolution in emission of sulphur agents in primary source regions of anthropogenic aerosols and alteration in characteristics of air masses transporting pollutants to Svalbard.
    • Affordances for capturing and re-enacting expert performance with wearables 

      Guest, Will; Wild, Fridolin; Vovk, Alla; Fominykh, Mikhail; Limbu, Bibeg; Klemke, Roland; Sharma, Puneet; Karjalainen, Jaakko; Smith, Carl; Rasool, Jazz; Aswat, Soyeb; Helin, Kaj; Di Mitri, Daniele; Schneider, Jan (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-09-05)
      The WEKIT.one prototype is a platform for immersive procedural training with wearable sensors and Augmented Reality. Focusing on capture and re-enactment of human expertise, this work looks at the unique affordances of suitable hard- and software technologies. The practical challenges of interpreting expertise, using suitable sensors for its capture and specifying the means to describe and display ...
    • Atmospheric Contamination of Coastal Cities by the Exhaust Emissions of Docked Marine Vessels: The Case of Tromsø 

      Zubiaga, Asier; Madsen, Synne; Khawaja, Hassan; Boiger, Gernot (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-09-03)
      Docked ships are a source of contamination for the city while they keep their engine working. Plume emissions from large boats can carry a number of pollutants to nearby cities causing a detrimental effect on the life quality and health of local citizens and ecosystems. A computational fluid dynamics model of the harbour area of Tromsø has been built in order to model the deposition of CO2 gas emitted ...
    • Atmospheric Contamination of Coastal Cities by the Exhaust Emissions of Docked Marine Vessels: the case of Tromsø 

      Zubiaga, Asier; Madsen, Synne; Khawaja, Hassan; Boiger, Gernot (Journal article; Tidsskriftartikkel, 2021-08-04)
      Docked ships are a source of contamination for the city while they keep their engine working. Plumes emissions from large boats can carry a number of pollutants to the nearby cities causing a detrimental effect on the life quality and health of local citizens and ecosystems. A computational fluid dynamics model of the harbour area of Tromsø has been built in order to model the deposition of CO2 gas ...
    • Best Venue to Disseminate Multiphysics Research 

      Khawaja, Hassan (Conference object; Konferansebidrag, 2019-12)
      Multiphysics analysis has been developed over the recent past to better represent the behaviour of complex processes by the use of simultaneous modelling of a number of systems. This development is driven by the industrial need to further the understanding of real physical phenomena in order to develop and design safer and more efficient products which are environmentally friendly. Such analyses ...
    • CFD modelling of pollutant transport 

      Madsen, Synne; Khawaja, Hassan (Conference object; Konferansebidrag, 2018)
      With the increase of the human activities in the Arctic, including land and sea, is resulting in higher release of pollutants to the environment. These pollutants can be categorised as gases released in the air such as carbon dioxide, sulphur dioxide, NOx, etc., and waste released in seas such as chemical toxins, microplastic, etc. This work presents a computational fluid dynamics (CFD) study ...
    • CFD modelling of pollutant transport from a docked marine vessel: Multiphysics 2019 [poster] 

      Madsen, Synne; Asier, Zubiaga; Khawaja, Hassan; Boiger, Gernot (Conference object; Konferansebidrag, 2019)
      With the increase of the human activities in the Arctic, including land and sea, is resulting in higher release of pollutants to the environment. These pollutants can be categorised as gases released in the air such as carbon dioxide, sulphur dioxide, NOx, etc., and waste released in seas such as chemical toxins, microplastic, etc. This work presents a computational fluid dynamics (CFD) study ...
    • Cold Technology Applications of Infrared Thermography (IRT) 

      Khawaja, Hassan (Conference object; Konferansebidrag, 2019)
    • A comparative study of CO2 heat pump performance for combined space and hot water heating 

      Brodal, Eivind; Jackson, Steven (Journal article; Peer reviewed, 2019-08-20)
      Heat pumps used for combined space and hot water heating are often used in modern energy-efficient buildings. Performance depends on both system design (exchanger sizes, compressor efficiency, etc.) and operating conditions (inlet water temperature, ratio between space and water heating, etc.). Designs using both CO2 and HFCs, such as R410A, are available, but the relative performance of these is ...
    • Comparison of Deep Learning Models for the Classification of Noctilucent Cloud Images 

      Sapkota, Rajendra; Sharma, Puneet; Mann, Ingrid (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-10)
      Optically thin layers of tiny ice particles near the summer mesopause, known as noctilucent clouds, are of significant interest within the aeronomy and climate science communities. Groundbased optical cameras mounted at various locations in the arctic regions collect the dataset during favorable summer times. In this paper, first, we compare the performances of various deep learningbased image ...
    • Comparison of Explicit Method of Solution for CFD Euler Problems using MATLAB® and FORTRAN 77 

      Nordli, Anders Samuelsen; Khawaja, Hassan (Journal article; Peer reviewed, 2019)
      This work presents a comparison of an explicit method of solution for an inviscid compressible fluid mechanics problem using Euler equations for two-dimensional internal flows. The same algorithm was implemented in both FORTRAN 77 and MATLAB®. The algorithm includes Runge‒Kutta time marching scheme with smoothing. Both solvers were initialized in the same manner. In addition, it was ensured that ...
    • A comparison of the energy consumption for CO2 compression process alternatives 

      Jackson, Steven; Brodal, Eivind (Journal article; Peer reviewed; Tidsskriftartikkel, 2018)
      The efficient transportation of large volumes of CO2 generally requires pipelines that will operate above the critical pressure of CO2. Since most capture processes release CO2 at low pressure, compression of CO2 from the point of capture to pipeline will generally be required. The compression duty can be achieved using conventional multi-stage compressors or using newer shockwave type compressors. ...
    • Computational Fluid Dynamics - A Stepping-Stone of MULTIPHYSICS 

      Khawaja, Hassan (Conference object; Konferansebidrag, 2022-07-07)
      Fluids have been around us for as long as we know; they have enabled us to cross the oceans, ride the winds, shorten distances, and much more. Computational Fluid Dynamics (CFD) has extended our understanding of fluids. Even to this day, the analytical solution of fundamental equations of fluid mechanics remains a million-dollar award problem (Clay Mathematics Institute). As engineers, we’ll leave ...
    • Conjugate Heat Transfer Model Based on SIMPLE and Coupled Energy and Heat Equations 

      Leyli, Amir Nadem; Andleeb, Zahra; Khawaja, Hassan; Messahel, Ramzi; Kanna, Rajesh; Moatamedi, Mojtaba (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-28)
      In this study, a numerical weak coupling strategy for the modeling of a conjugate heat transfer phenomenon is considered. Where the incompressible Navier-Stokes equations are solved using the Semi-Implicit Method for Pressure Linked Equations (SIMPLE) as a first step, and then the heat conduction equation for solid is solved in a second step considering the convective velocity field resulting from ...
    • Cost-related analysis of implementing energy-efficient retrofit measures in the residential building sector of a middle-income country – A case study of Bosnia and Herzegovina 

      Kadrić, Džana; Aganovic, Amar; Martinović, Sandra; Delalić, Nijaz; Delalić-Gurda, Berina (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-12-15)
      This study presents an in-depth analysis of the cost structure when planning EE retrofit measures in the residential sector in Bosnia and Herzegovina. The analysis showed that implementing EE retrofit measures would result in substantial energy savings in single-family houses, however, the specific cost of implementing EE retrofit measures per resident for single-family houses is on average 2.8 ...
    • Detection of Cracks and Potholes in Roads using Infrared Thermography 

      Tanveer, Ahmad; Khawaja, Hassan (Conference object, 2017)
      Many remote sensing techniques can be used to identify the cracks/voids on the road surfaces. The given research focuses on applying infrared thermography (IRT). IRT technology can detect features based on the different thermal signature. This method would be an excellent tool for detecting the fracture/cracks. It is because of the reason that the naturally occurring water (rain, snowmelt, etc.) ...
    • Detection of Red Dye in Diesel Oil 

      Varughese, Bindu Sara; Khawaja, Hassan Abbas (Journal article; Tidsskriftartikkel; Peer reviewed, 2017)
      Developing a sensitive and effective instrument for detecting the presence of red dye in diesel fuel is very advantageous for governments in preventing tax loss by controlling illegal use of the diesel fuel. The objective of this work has been to investigate and develop an instrument to detect red dye in diesel, based on the principle of absorption. The peaks of absorption in red and pure diesel ...
    • Detection of red dye in diesel oil using UV-absorption and silicon photo detector 

      Varughese, Bindu Sara (Conference object; Konferansebidrag, 2016-12-08)
      Developing a sensitive and effective instrument for detecting the presence of red dye in diesel fuel is very advantageous for governments in preventing tax loss by controlling illegal use of the diesel fuel. The objective of this work has been to investigate and develop an instrument to detect red dye in diesel, based on the principle of absorption. The peaks of absorption in red and pure diesel ...
    • Detection, Identification and Size distribution of micro-plastic particles 

      Varughese, Bindu Sara; Edvardsen, Kåre (Conference object; Konferansebidrag, 2017)
      Pollution by micro-plastic in ecosystems is one of the major problems we are facing now, especially in marine environment. Many studies are going on the detection of different micro substances that pollute our environment. Micro-plastics are among the more frequent pollutants of the sort in aquatic ecosystems. There have been some studies earlier on methodologies to detect and identify micro-plastic ...
    • Determining Thermal Properties of Polyurethane by Solving the Heat Equation and IR Imaging 

      Norum, Hans-Kristian; Andleeb, Zahra; Khawaja, Hassan; Moatamedi, Mojtaba (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-27)
      All materials have different and unique thermal properties that determine how the temperature changes when a material is subjected to a temperature difference. This study was intended to investigate the thermal properties of a polymer called Polyurethane, focusing on anti-seepage and anti-abrasion polyurethane. The thermal conductivity and heat transfer coefficient of cold polyurethane specimens ...