Now showing items 1-20 of 159

    • 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: ...
      Peer reviewedJournal article
    • Analysis of Control Volume Heterogeneous Multiscale Methods for Single Phase Flow in Porous Media 

      Alyaev, Sergey; Keilegarden, Eirik; Nordbotten, Jan Martin (SIAM, 2014)
      The standard approximation for the flow-pressure relationship in porous media is Darcy's law that was originally derived for infiltration of water in fine homogeneous sands. Ever since there have been numerous attempts to ...
      Peer reviewedJournal article
    • Analysis of multi-beam sonar echos of herring schools by means of simulation 

      Holmin, Arne Johannes (The University of Bergen, 2013-05-31)
      The synchronized behavior of large schools of fish can be a fascinating sight and has caught the attention of researchers for decades. Schools of thousands, or even millions of fish can seemingly function as a single entity, ...
      Doctoral thesisPeer reviewed
    • Analytical solutions for aquifer thermal energy storage 

      Nordbotten, Jan Martin (American Geophysical Union, 2017-02)
      The concept of aquifer thermal energy storage involves injection of water at elevated temperature, and possibly nonambient salinity, into a host aquifer. We consider axisymmetric injection, wherein both the composition and ...
      Peer reviewedJournal article
    • 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 ...
      Peer reviewedJournal article
    • 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 ...
      Peer reviewedJournal article
    • 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 were ...
      Peer reviewedJournal article
    • Bridging the ensemble Kalman filter and particle filters: the adaptive Gaussian mixture filter 

      Stordal, Andreas Størksen; Karlsen, Hans A.; Nævdal, Geir; Skaug, Hans J.; Vallès, Brice (Springer, 2010)
      The nonlinear filtering problem occurs in many scientific areas. Sequential Monte Carlo solutions with the correct asymptotic behavior such as particle filters exist, but they are computationally too expensive when working ...
      Peer reviewedJournal article
    • Brill–Noether theory of squarefree modules supported on a graph 

      Fløystad, Gunnar; Lohne, Henning (Elsevier, 2013-05)
      We investigate the analogy between squarefree Cohen- Macaulay modules supported on a graph and line bundles on a curve. We prove a Riemann–Roch theorem, we study the Jacobian and gonality of a graph, and we prove Clifford’s ...
      Peer reviewedJournal article
    • Capturing the coupled hydro-mechanical processes occurring during CO2 injection – example from In Salah 

      Bjørnarå, Tore Ingvald; Mathias, Simon A.; Nordbotten, Jan Martin; Park, Joonsang; Bohloli, Bahman (Elsevier, 2014)
      At In Salah, CO2 is removed from the production stream of several natural gas fields and re-injected into a deep and relatively thin saline formation, in three different locations. The observed deformation on the surface ...
      Peer reviewedJournal article
    • Cell-centered finite volume discretizations for deformable porous media 

      Nordbotten, Jan Martin (Wiley, 2014-08-11)
      The development of cell-centered finite volume discretizations for deformation is motivated by the desire for a compatible approach with the discretization of fluid flow in deformable porous media. We express the conservation ...
      Peer reviewedJournal article
    • Combinatorial description of jumps in spectral networks. 

      Frolova, Anastasia; Vasil'ev, Alexander (The American Mathematical Society, 2017)
      We describe a graph parametrization of rational quadratic differen- tials with presence of a simple pole, whose critical trajectories form a network depending on parameters focusing on the network topological jumps. Obtained ...
      Peer reviewedJournal article
    • A Comparison of Anthropometric Measures for Assessing the Association between Body Size and Risk of Chronic Low Back Pain: TheHUNT Study 

      Heuch, Ingrid; Heuch, Ivar; Hagen, Knut; Zwart, John-Anker (PLoS, 2015-10-27)
      Background: Previous work indicates that overweight and obese individuals carry an increased risk of experiencing chronic low back pain (LBP). It is not known, however, how the association with body size depends on the ...
      Peer reviewedJournal article
    • Conforming, non-conforming and non-matching discretization couplings in discrete fracture network simulations 

      Fumagalli, Alessio; Keilegavlen, Eirik; Scialo, Stefano (Elsevier, 2019)
      Simulations of fluid flow in naturally fractured rocks have implications for several subsurface applications, including energy storage and extraction, and waste disposal. We are interested in flow in discrete fracture ...
      Peer reviewedJournal article
    • Consistency issues in pdf methods 

      Suciu, Nicolae; Schüler, Lennart; Radu, Adrian Florin; Attinger, Sabine; Vamo̧s, Cǎlin; Knabner, Peter (Tipografia Universitatii Ovidius, 2015)
      Concentrations of chemical species transported in random environments need to be statistically characterized by probability density functions (PDF). Solutions to evolution equations for the one-point one-time PDF are usually ...
      Peer reviewedJournal article
    • Consistent MPFA Discretization for Flow in the Presence of Gravity 

      Starnoni, Michele; Berre, Inga; Keilegavlen, Eirik; Nordbotten, Jan Martin (AGU, 2019)
      A standard practice used in the industry to discretizing the gravity term in the two‐phase Darcy flow equations is to apply an upwind strategy. In this paper, we show that this can give a persistent unphysical flux field ...
      Peer reviewedJournal article
    • A Continuous Max-Flow Approach to Minimal Partitions with Label Cost Prior 

      Yuan, Jing; Bae, Egil; Boykov, Yuri; Tai, Xue-Cheng (The authors, 2011)
      This paper investigates a convex relaxation approach for minimum description length (MDL) based image partitioning or labeling, which proposes an energy functional regularized by the spatial smoothness prior joint with a ...
      ChapterPeer reviewed
    • Convergence of a Cell-Centered Finite Volume Discretization for Linear Elasticity 

      Nordbotten, Jan Martin (SIAM, 2015-11-19)
      We show convergence of a cell-centered finite volume discretization for linear elasticity. The discretization, termed the MPSA method, was recently proposed in the context of geological applications, where cell-centered ...
      Peer reviewedJournal article
    • Cost efficient environmental survey paths for detecting continuous tracer discharges 

      Alendal, Guttorm (American Geophysical Union, 2017-07)
      Designing monitoring programs for detecting potential tracer discharges from unknown locations is challenging. The high variability of the environment may camouflage the anticipated anisotropic signal from a discharge, and ...
      Peer reviewedJournal article
    • Cubical and cosimplicial descent 

      Dundas, Bjørn Ian; Rognes, John (Wiley, 2018)
      We prove that algebraic K ‐theory, topological Hochschild homology and topological cyclic homology satisfy cubical and cosimplicial descent at connective structured ring spectra along 1‐connected maps of such ring spectra.
      Peer reviewedJournal article