Viser treff 1-20 av 814

    • CSF circulation and dispersion yield rapid clearance from intracranial compartments 

      Hornkjøl, Martin; Valnes, Lars Magnus; Ringstad, Geir; Rognes, Marie Elisabeth; Eide, Per Kristian; Mardal, Kent-Andre; Vinje, Vegard (Journal article; Peer reviewed, 2022-09-12)
      In this paper, we used a computational model to estimate the clearance of a tracer driven by the circulation of cerebrospinal fluid (CSF) produced in the choroid plexus (CP) located within the lateral ventricles. CSF was ...
    • A study of the diffusive properties of a modified compressible Navier-Stokes model 

      Svärd, Magnus; Munthe, Karl (Journal article; Peer reviewed, 2022)
      The aim of this study is to provide further validation for the weakly well-posed modified compressible Navier-Stokes system proposed in Svärd (Phys A 506:350–375, 2018) when applied to ideal gases. We do so by considering ...
    • Construction of Equilibria in Strategic Stackelberg Games in Multi-Period Supply Chain Contracts 

      Azad Gholami, Reza; Sandal, Leif Kristoffer; Ubøe, Jan (Journal article; Peer reviewed, 2022-10-27)
      Almost every supplier faces uncertain and time-varying demand. E-commerce and online shopping have given suppliers unprecedented access to data on customers’ behavior, which sheds light on demand uncertainty. The main ...
    • GUBS: Graph-Based Unsupervised Brain Segmentation in MRI Images 

      Mayala, Simeon Sahani; Herdlevær, Ida Ajvazi; Haugsøen, Jonas Bull; Anandan, Shamundeeswari; Blaser, Nello; Gavasso, Sonia; Brun, Morten (Journal article; Peer reviewed, 2022)
      Brain segmentation in magnetic resonance imaging (MRI) images is the process of isolating the brain from non-brain tissues to simplify the further analysis, such as detecting pathology or calculating volumes. This paper ...
    • Assuring the integrity of offshore carbon dioxide storage 

      Connelly, D.P.; Bull, J.M.; Flohr, A.; Schaap, A.; Koopmans, D.; Blackford, J.C.; White, P.R.; James, R.H.; Pearce, C.; Lichtschlag, A.; Achterberg, E.P.; de Beer, D; Roche, B.; Li, J.; Saw, K.; Alendal, Guttorm; Avlesen, Helge; Brown, R.; Borisov, S.M.; Böttner, C.; Cazenave, P.W.; Chen, B.; Dale, A.W.; Dean, M.; Dewar, M.; Esposito, M.; Gros, J.; Hanz, R.; Haeckel, M.; Hosking, B.; Huvenne, V.; Karstens, Jens; Le Bas, T.; Leighton, T.G.; Linke, P.; Loucaides, S.; Matter, J.M.; Monk, S.; Mowlem, M.C.; Oleynik, Anna; Omar, Abdirahman; Peel, K.; Provenzano, G.; Saleem, U.; Schmidt, M.; Schramm, B.; Sommer, S.; Strong, J.; Suarez, I. Falcon; Ungerboeck, B.; Widdicombe, S.; Wright, H.; Yakushev, Evgeniy (Journal article; Peer reviewed, 2022)
      Carbon capture and storage is a key mitigation strategy proposed for keeping the global temperature rise below 1.5 °C. Offshore storage can provide up to 13% of the global CO2 reduction required to achieve the Intergovernmental ...
    • Geometric rough paths on infinite dimensional spaces 

      Grong, Erlend; Nilssen, Torstein; Schmeding, Alexander (Journal article; Peer reviewed, 2022)
      Similar to ordinary differential equations, rough paths and rough differential equations can be formulated in a Banach space setting. For α ∈ (1/3,1/2), we give criteria for when we can approximate Banach space-valued ...
    • Development of robust and efficient solution strategies for coupled problems 

      Storvik, Erlend (Doctoral thesis, 2022-10-10)
      Det er mange modeller i moderne vitenskap hvor sammenkoblingen mellom forskjellige fysiske prosesser er svært viktig. Disse finner man for eksempel i forbindelse med lagring av karbondioksid i undervannsreservoarer, flyt ...
    • Evaluating the suitability of close-kin mark-recapture as a demographic modelling tool for a critically endangered elasmobranch population 

      Delaval, Aurelien Nicolas; Bendall, Victoria; Hetherington, Stuart; Skaug, Hans Julius; Frost, Michelle; Jones, Catherine; Noble, Leslie Robert (Journal article; Peer reviewed, 2022)
      Estimating the demographic parameters of contemporary populations is essential to the success of elasmobranch conservation programmes, and to understanding their recent evolutionary history. For benthic elasmobranchs such ...
    • A gentle tutorial on accelerated parameter and confidence interval estimation for hidden Markov models using Template Model Builder 

      Bacri, Timothee Raphael Ferdinand; Berentsen, Geir Drage; Bulla, Jan; Hølleland, Sondre Nedreås (Journal article; Peer reviewed, 2022)
      A very common way to estimate the parameters of a hidden Markov model (HMM) is the relatively straightforward computation of maximum likelihood (ML) estimates. For this task, most users rely on user-friendly implementation ...
    • Modeling the Process of Speciation Using a Multiscale Framework Including A Posteriori Error Estimates 

      Brun, Mats Kirkesæther; Ahmed, Elyes; Nordbotten, Jan Martin; Stenseth, Nils Christian (Journal article; Peer reviewed, 2022)
      This paper concerns the modeling and numerical simulation of the process of speciation. In particular, given conditions for which one or more speciation events within an ecosystem occur, our aim is to develop the necessary ...
    • A horizontal Chern–Gauss–Bonnet formula on totally geodesic foliations 

      Baudoin, Fabrice; Grong, Erlend; Vega-Molino, Gianmarco (Journal article; Peer reviewed, 2022)
      Under suitable conditions, we show that the Euler characteristic of a foliated Riemannian manifold can be computed only from curvature invariants which are transverse to the leaves. Our proof uses the hypoelliptic sub-Laplacian ...
    • Threshold estimation based on local minima for nucleus and cytoplasm segmentation 

      Mayala, Simeon Sahani; Haugsøen, Jonas Bull (Journal article; Peer reviewed, 2022)
      Background Image segmentation is the process of partitioning an image into separate objects or regions. It is an essential step in image processing to segment the regions of interest for further processing. We propose a ...
    • Wave response to an arbitrary motion of a load on an ice plate 

      Johnsen, Kristoffer (Master thesis, 2022-06-22)
    • Hybrid Modeling of the N-Body Problem with Applications to Astrophysics 

      Synnevåg, Åsmund van Brussel (Master thesis, 2022-06-01)
      Over the last years, the field of hybrid modeling, the concept of combining data-driven machine learning models and numerical solution methods to simulate a physical system, has seen an immense increase in research. This ...
    • Fully Automatic Whole-Volume Tumor Segmentation in Cervical Cancer 

      Hodneland, Erlend; Kaliyugarasan, Sathiesh Kumar; Wagner-Larsen, Kari Strøno; Lura, Njål Gjærde; Andersen, Erling; Bartsch, Hauke; Smit, Noeska Natasja; Halle, Mari Kyllesø; Krakstad, Camilla; Lundervold, Alexander Selvikvåg; Haldorsen, Ingfrid S. (Journal article; Peer reviewed, 2022-05-11)
      Uterine cervical cancer (CC) is the most common gynecologic malignancy worldwide. Whole-volume radiomic profiling from pelvic MRI may yield prognostic markers for tailoring treatment in CC. However, radiomic profiling ...
    • A posteriori error estimation and modeling of unsaturated flow in fractured porous media 

      Varela Estigarribia, Jhabriel Daniel (Doctoral thesis, 2022-06-17)
      This doctoral thesis focuses on three topics: (1) modeling of unsaturated flow in fractured porous media, (2) a posteriori error estimation for mixed-dimensional elliptic equations, and (3) contributions to open-source ...
    • A Finite-Volume-Based Module for Unsaturated Poroelasticity 

      Varela, Jhabriel; Gasda, Sarah Eileen; Keilegavlen, Eirik; Nordbotten, Jan Martin (Chapter, 2021)
      In this chapter, we present fv-unsat, a multipoint finite-volume–based solver for unsaturated flow in deformable and nondeformable porous media. The latter is described using the mixed form of Richards’ equation, whereas ...
    • Socioeconomic and geographic differences in ablation of atrial fibrillation in Norway - a national cohort study 

      Olsen, Frank; Uleberg, Bård Erling; Jacobsen, Bjarne K.; Heuch, Ivar; Tande, Pål Morten; Bugge, Einar; Balteskard, Lise (Journal article; Peer reviewed, 2022)
      Background The aim of this study was to analyse whether there are patient related or geographic differences in the use of catheter ablation among atrial fibrillation patients in Norway. Methods National population-based ...
    • Interdisciplinary and Transferable Concepts in Bioinformatics Education: Observations and Approaches From a UK MSc Course 

      Johnston, Iain; Slater, Mark; Cazier, Jean-Baptiste (Journal article; Peer reviewed, 2022-02-24)
      Bioinformatics is a highly interdisciplinary subject, with substantial and growing influence in health, environmental science and society, and is utilised by scientists from many diverse academic backgrounds. Education in ...