Nye registreringer

  • Hospitals' Discharge Tendency and Risk of Death - An Analysis of 60,000 Norwegian Hip Fracture Patients 

    Nilsen, Sara Marie; Bjørngaard, Johan Håkon; Carlsen, Fredrik; Anthun, Kjartan Sarheim; Johnsen, Lars Gunnar; Vatten, Lars Johan; Asheim, Andreas (Peer reviewed; Journal article, 2020)
    Purpose: A reduction in the length of hospital stay may threaten patient safety. This study aimed to estimate the effect of organizational pressure to discharge on 60-day mortality among hip fracture patients. Patients ...
  • A Blind Coupon Mechanism Enabling Veto Voting over Unreliable Networks 

    Gjøsteen, Kristian; Gritti, Clementine Jeanne Pierrette; Boyd, Colin Alexander; Haines, Thomas Edmund (Peer reviewed; Journal article, 2019)
    A Blind Coupon Mechanism (BCM) allows spreading of alerts quietly and quickly over unreliable networks. The BCM primitive ensures that alerts are efficiently broadcast while the nature of these signals are securely hidden. ...
  • Validation of the numerical simulations of flow around a scaled-down turbine using experimental data from wind tunnel 

    Siddiqui, Muhammad Salman; Rasheed, Adil; Kvamsdal, Trond (Peer reviewed; Journal article, 2019)
    Aerodynamic characteristic of a small scale wind turbine under the influence of an incoming uniform wind field is studied using k-ω Shear Stress Transport turbulence model. Firstly, the lift and drag characteristics of the ...
  • Non-uniform dependence on initial data for equations of Whitham type 

    Arnesen, Mathias Nikolai (Journal article, 2019)
    We consider the Cauchy problem ∂tu + u∂xu + L(∂xu) = 0, u(0, x) = u0(x) for a class of Fourier multiplier operators L, and prove that the solution map u0 7→ u(t) is not uniformly continuous in Hs on the real line or on the ...
  • Action Representation in the Mouse Parieto-Frontal Network 

    Tombaz, Tuce; Dunn, Benjamin Adric; Hovde, Karoline; Cubero, Ryan John Abat; Mimica, Bartul; Mamidanna, Pranav; Roudi, Yasser; Whitlock, Jonathan (Peer reviewed; Journal article, 2020)
    The posterior parietal cortex (PPC) and frontal motor areas comprise a cortical network supporting goal-directed behaviour, with functions including sensorimotor transformations and decision making. In primates, this network ...
  • Statistical methods for estimating fluctuating selection 

    Cao, Yihan (Doctoral theses at NTNU;2020:99, Doctoral thesis, 2020)
  • Parasite prevalence increases with temperature in an avian metapopulation in northern Norway 

    Holand, Håkon; Jensen, Henrik; Kvalnes, Thomas; Tufto, Jarle; Pärn, Henrik; Sæther, Bernt-Erik; Ringsby, Thor Harald (Peer reviewed; Journal article, 2019)
    Climate and weather conditions may have substantial effects on the ecology of both parasites and hosts in natural populations. The strength and shape of the effects of weather on parasites and hosts are likely to change ...
  • Matrix factorizations for quantum complete intersections 

    Bergh, Petter Andreas; Erdmann, Karin (Peer reviewed; Journal article, 2019)
    We introduce twisted matrix factorizations for quantum complete intersections of codimension two. For such an algebra, we show that in a given dimension, almost all the indecomposable modules with bounded minimal projective ...
  • Parametric spatial covariance models in the ensemble Kalman filter 

    Skauvold, Jacob; Eidsvik, Jo (Peer reviewed; Journal article, 2019)
    Several applications rely on data assimilation methods for complex spatio-temporal problems. The focus of this paper is on ensemble-based methods, where some approaches require estimation of covariances between state ...
  • Solitary wave solutions to a class of Whitham?Boussinesq systems 

    Nilsson, Dag Viktor; Wang, Yuexun (Peer reviewed; Journal article, 2019)
    In this note, we study solitary wave solutions of a class of Whitham–Boussinesq systems which include the bidirectional Whitham system as a special example. The travelling wave version of the evolution system can be reduced ...
  • Malicious cryptography 

    Galteland, Herman (Doctoral theses at NTNU;2020:116, Doctoral thesis, 2020)
  • Didactics of Mathematics as a Research Field in Scandinavia 

    Rønning, Frode (Chapter; Peer reviewed, 2019)
    This chapter presents an overview of the development of didactics of mathematics as a research domain in the three Scandinavian countries, Denmark, Norway and Sweden. This presentation is linked to the development of the ...
  • Quand des didacticiens de mathématiques français discutent des théories avec des chercheurs britanniques et européens 

    Abboud, Maha; Coles, Alf; Chesnais, Aurélie; Horoks, Julie; Jaworski, Barbara; Mangiante-Orsola, Christine; Perrin-Glorian, Marie-Jeanne; Strømskag, Heidi; Robert, Aline; Rogalski, Janine (Chapter, 2019)
    Ce texte est constitué de quatre parties correspondant à trois communications et une table ronde. Nous avons choisi de présenter ces contributions en un seul texte étant donné qu’elles rendent compte des travaux et des ...
  • Accounting for student perspectives in task design 

    Ainley, Janet; Margolinas, Claire; Barquero, Berta; Bikner-Ahsbahs, Angelika; Calleja, James; Clarke, David; Coles, Alf; Gardner, Kimberley; Gimenez, Joaquim; Johnson, Heather L.; Lin, Pi-Jen; Lithner, Johan; Radonich, Peter; Savard, Annie; Strømskag, Heidi (Chapter, 2015)
    This chapter aims to provide insights into students’ perspectives about the meanings and purposes of mathematical tasks and to understand how appropriate task design might help minimize any gaps between teacher intentions ...
  • Evaluation of selected finite-difference and finite-volume approaches to rotational shallow-water flow 

    Holm, Håvard Heitlo; Brodtkorb, André R.; Brostrøm, Gøran; Christensen, Kai Håkon; Sætra, Martin Lilleeng (Journal article; Peer reviewed, 2020)
    The shallow-water equations in a rotating frame of reference are important for capturing geophysical flows in the ocean. In this paper, we examine and compare two traditional finite-difference schemes and two modern finite-volume ...
  • Dynamics of transcendental Henon maps 

    Arosio, Leandro; Benini, Anna Miriam; Fornæss, John Erik; Peters, Han (Journal article; Peer reviewed, 2019)
    The dynamics of transcendental functions in the complex plane has received a significant amount of attention. In particular much is known about the description of Fatou components. Besides the types of periodic Fatou ...
  • Shunning algebraic formalism: Student teachers and the intricacy of percents 

    Strømskag, Heidi (Journal article; Peer reviewed, 2020)
    This paper investigates primary and lower secondary school student teachers’ use and mastery of algebraic formalism in solving the task of determining the rate of increase of a square’s area when the square’s side increases ...
  • Nonlinear domain decomposition scheme for sequential fully implicit formulation of compositional multiphase flow 

    Møyner, Olav; Moncorge, A (Journal article; Peer reviewed, 2019)
    New sequential fully implicit (SFI) methods for compositional flow simulation have been recently investigated. These SFI schemes decouple the fully coupled problem into separate pressure and transport problems and have ...
  • GPU Computing with Python: Performance, Energy Efficiency and Usability 

    Holm, Håvard Heitlo; Brodtkorb, André R.; Sætra, Martin Lilleeng (Journal article; Peer reviewed, 2020)
    In this work, we examine the performance, energy efficiency, and usability when using Python for developing high-performance computing codes running on the graphics processing unit (GPU). We investigate the portability of ...
  • Efficient reordered nonlinear Gauss–Seidel solvers with higher order for black-oil models 

    Klemetsdal, Øystein Strengehagen; Rasmussen, Atgeirr Flø; Møyner, Olav; Lie, Knut-Andreas (Journal article; Peer reviewed, 2019)
    The fully implicit method is the most commonly used approach to solve black-oil problems in reservoir simulation. The method requires repeated linearization of large nonlinear systems and produces ill-conditioned linear ...

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