Recent Submissions

  • Mønstre og kvalitet. Analyse av samtaler i matematikkundervisning 

    Mjaavatn, Geir (The University of Bergen, 2015-06-03)
    Oppgaven diskuterer hvordan man kan analysere samtaler mellom lærer og elever i matematikkundervisning. Deretter diskuterer oppgaven hva som kjennetegner en kvalitativ god samtale.
  • Statistiske modelleringer i det europeiske gassmarkedet 

    Frontéri, Anette Ullestad (The University of Bergen, 2015-06-01)
    I denne oppgaven studerer vi naturgassmarkedet i Europa. Først ser vi på hvilke forhold som påvirker gassprisen. Deretter studerer vi statistisk teori om tidsrekker, volatilitet og copula. Til slutt blir det gjort ...
  • Natural Convection in Layered Porous Media between Coaxial Cylinders 

    Selheim, Bianca (The University of Bergen, 2015-05-31)
    In this thesis a mathematical model is developed to describe the onset of natural convection in a two-layer porous medium located between two coaxial cylinders, motivated by natural convection processes in geothermal ...
  • Detecting atmospheric rivers using persistent homology 

    Alfsvåg, Kristian Stusdal (The University of Bergen, 2015-06-01)
    This master's thesis is a first investigation on the problem of seeing whether it is possible to detect atmospheric rivers using persistent homology. Two different computations are done and a basic analysis is made. In ...
  • Logarithmic Hochschild homology 

    Piceghello, Stefano (The University of Bergen, 2015-06-01)
    The purpose of this thesis is to analyse the logarithmic Hochschild homology for pre-log rings and to provide some tools to compute it in certain cases. One of the main strategies that we will employ to describe the log ...
  • Numerical Modelling of Microbial Enhanced Oil Recovery with Focus on Dynamic Effects: An Iterative Approach 

    Skiftestad, Kai (Universitetet i Bergen (UiB), 2015-06-27)
    Recovering more of the available oil has been a main driver behind the extensive work done in the field of enhanced oil recovery (EOR) over the last decades. Microbial en- hanced oil recovery (MEOR) has been heavily ...
  • Application of Vertically-Integrated Models with Subscale Vertical Dynamics to Field Sites for CO2 Sequestration 

    Guo, B; Bandilla, Karl W.; Keilegavlen, Eirik; Doster, Florian; Celia, Michael A. (Elsevier, 2014)
    To address the engineering questions on security issues of geological carbon sequestration (GCS), a broad range of computational models with different levels of complexity have been developed - from multiphase multicomponent ...
  • Association between body height and chronic low back pain: a follow-up in the Nord-Trøndelag Health Study 

    Heuch, Ingrid; Heuch, Ivar; Hagen, Knut; Zwart, John-Anker (BMJ, 2015-06-15)
    Objective: To study potential associations between body height and subsequent occurrence of chronic low back pain (LBP). Design: Prospective cohort study. Setting: The North-Trøndelag Health Study (HUNT). Data ...
  • Skipped spawning in Northeast Arctic haddock Melanogrammus aeglefinus 

    Skjæraasen, Jon Egil; Korsbrekke, Knut; Nilsen, Trygve; Fonn, Merete; Kjesbu, Olav Sigurd; Dingsør, Gjert Endre; Nash, Richard David Marriott (Inter-Research, 2015-04-22)
    Large interannual fluctuations in the numbers of offspring joining a teleost population are common, yet factors affecting offspring production, a key driver of fish population size and demography, are often poorly understood. ...
  • Brøkforståing hjå elevar som startar i den vidaregåande skulen 

    Antun, Jorunn (The University of Bergen, 2015-04-30)
    Målet for denne oppgåva har vore å få større innsikt i kva brøkforståing elevar som startar i den vidaregåande skulen kan ha. To forskingsspørsmål har lagt til grunn for arbeidet mitt: 1.Kva forståing av og dugleikar ...
  • SUCCESS: SUbsurface CO2 storage–Critical elements and superior strategy 

    Aker, Eyvind; Bjørnarå, Tore Ingvald; Braathen, Alvar; Brandvoll, Øyvind; Dahle, Helge K.; Nordbotten, Jan Martin; Aagaard, Per; Hellevang, Helge; Alemu, Binyam Lema; Pham, Van Thi Hai; Johansen, Harald; Wangen, Magnus; Nøttvedt, Arvid; Aavatsmark, Ivar; Johannessen, Truls; Durand, Dominique (Elsevier, 2011)
    SUCCESS is a Center for Environmental Energy Research in Norway and performs research related to geological storage of CO2 in the subsurface. The SUCCESS centre is established by the Research Council of Norway together ...
  • Field-case simulation of CO2-plume migration using vertical-equilibrium models 

    Nilsen, Halvor Møll; Herrera, Paulo; Ashraf, Seyed Meisam; Ligaard, Ingeborg S.; Iding, Martin; Hermanrud, Christian; Lie, Knut-Andreas; Nordbotten, Jan Martin; Dahle, Helge K.; Keilegavlen, Eirik (Elsevier, 2011)
    When injected in deep saline aquifers, CO2 moves radially away from the injection well and progressively higher in the formation because of buoyancy forces. Analyzes have shown that after the injection period, CO2 will ...
  • Upscaled modeling of CO2 injection and migration with coupled thermal processes 

    Gasda, Sarah Eileen; Stephansen, Annette; Aavatsmark, Ivar; Dahle, Helge K. (Elsevier, 2013)
    A practical modeling approach for CO2 storage over relatively large length and time scales is the vertical-equilibrium model, which solves partially integrated conservation equations for flow in two lateral dimensions. ...
  • Assessing Model Uncertainties Through Proper Experimental Design 

    Hvidevold, Hilde Kristine; Alendal, Guttorm; Johannessen, Truls; Mannseth, Trond (Elsevier, 2013)
    This paper assesses how parameter uncertainties in the model for rise velocity of CO2 droplets in the ocean cause uncertainties in their rise and dissolution in marine waters. The parameter uncertainties in the rise velocity ...
  • Risk of Leakage versus Depth of Injection in Geological Storage 

    Celia, Michael A.; Nordbotten, Jan Martin; Bachu, Stefan; Dobossy, Mark E.; Court, Benjamin (Elsevier, 2009-02)
    One of the outstanding challenges for large-scale CCS operations is to develop reliable quantitative risk assessments with a focus on leakage of both injected CO2 and displaced brine. A critical leakage pathway is associated ...
  • Active and integrated management of water resources throughout CO2 capture and sequestration operations 

    Court, Benjamin; Celia, Michael A.; Nordbotten, Jan Martin; Elliot, Thomas R. (Elsevier, 2011)
    Most projected climate change mitigation strategies will require a significant expansion of CO2 Capture and Sequestration (CCS) in the next two decades. Four major categories of challenges are being actively researched: ...
  • An efficient software framework for performing industrial risk assessment of leakage for geological storage of CO2 

    Dobossy, Mark E.; Celia, Michael A.; Nordbotten, Jan Martin (Elsevier, 2011)
    In response to anthropogenic CO2 emissions, geological storage has emerged as a practical and scalable bridge technology while renewables and other environmentally friendly energy production methods mature. While an ...
  • Detecting leakage of brine or CO2 through abandoned wells in a geological sequestration operation using pressure monitoring wells 

    Nogues, Juan P.; Nordbotten, Jan Martin; Celia, Michael A. (Elsevier, 2011)
    For risk assessment, policy design and GHG emission accounting it is extremely important to know if any CO2 or brine has leaked from a geological sequestration (GS) operation. As such, it is important to understand if it ...
  • The impact of local-scale processes on large-scale CO2 migration and immobilization 

    Gasda, Sarah Eileen; Nordbotten, Jan Martin; Celia, Michael A. (Elsevier, 2011)
    Storage security of injected carbon dioxide (CO2) is an essential component of risk management for geological carbon sequestration operations. During the injection and early post-injection periods, CO2 leakage may occur ...
  • A 3D computational study of effective medium methods applied to fractured media 

    Sævik, Pål Næverlid; Berre, Inga; Jakobsen, Morten; Lien, Martha (Springer, 2013-10)
    This work evaluates and improves upon existing effective medium methods for permeability upscaling in fractured media. Specifically, we are concerned with the asymmetric self-consistent, symmetric self-consistent, and ...

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