Blar i Department of Mathematics på tittel
Viser treff 386-405 av 966
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Is there a U-shaped relationship between physical activity in leisure time and risk of chronic low back pain? A follow-up in the HUNT Study
(Peer reviewed; Journal article, 2016-04-11)Background: Physical activity in leisure time is often considered to have favourable effects on the risk of low back pain (LBP), but demonstrating a definite association in epidemiological studies has proven difficult. The ... -
Is there an Association between vitamin D status and risk of chronic low back pain? A nested case-Control analysis in the Nord-Trøndelag Health Study
(Peer reviewed; Journal article, 2017-11-25)Objectives: To explore potential associations between vitamin D status and risk of chronic low back pain (LBP) in a Norwegian cohort, and to investigate whether relationships depend on the season of blood sample collection. ... -
An isenthalpic formulation for simulating geothermal systems with phase changes
(Chapter; Peer reviewed, 2023)We propose a unified isenthalpic formulation for the equilibrium problem of compositional multiphase mixtures. To solve the equilibrium problem numerically, we used an interior point method with line search and present an ... -
Iterative Coupling for Fully Dynamic Poroelasticity
(Journal article; Peer reviewed, 2021)We present an iterative coupling scheme for the numerical approximation of the mixed hyperbolic-parabolic system of fully dynamic poroelasticity. We prove its convergence in the Banach space setting for an abstract ... -
Iterative Linearisation Schemes for Doubly Degenerate Parabolic Equations
(Peer reviewed; Journal article, 2019)Mathematical models for flow and reactive transport in porous media often involve non-linear, degenerate parabolic equations. Their solutions have low regularity, and therefore lower order schemes are used for the numerical ... -
Iterative schemes for solving coupled, non-linear flow and transport in porous media
(Master thesis, 2016-12-24)In this thesis we compare different iterative approaches for solving the non-linear, coupled multiphase flow and reactive transport in porous media. Especially, we consider two-phase flow and one a-half phase flow (modeled ... -
Iterative schemes for surfactant transport in porous media
(Journal article; Peer reviewed, 2021)In this work, we consider the transport of a surfactant in variably saturated porous media. The water flow is modelled by the Richards equations and it is fully coupled with the transport equation for the surfactant. Three ... -
Iterative solvers for Biot model under small and large deformation
(Journal article; Peer reviewed, 2021)We consider L-scheme and Newton-based solvers for Biot model under large deformation. The mechanical deformation follows the Saint Venant-Kirchoff constitutive law. Furthermore, the fluid compressibility is assumed to be ... -
Iterative solvers for poromechanics : Iterative solvers for poromechanics
(Doctoral thesis, 2019-11-22)This thesis concerns iterative solvers for poromechanics problems. The problems in the studies have involved linear poromechanics, non-linear poromechanics, and poromechanics under large deformation. We included high order ... -
Iterative splitting schemes for a soft material poromechanics model
(Journal article; Peer reviewed, 2021)We address numerical solvers for a poromechanics model particularly adapted for soft materials, as it generally respects thermodynamics principles and energy balance. Considering the multi-physics nature of the problem, ... -
An iterative staggered scheme for phase field brittle fracture propagation with stabilizing parameters
(Journal article; Peer reviewed, 2020)This paper concerns the analysis and implementation of a novel iterative staggered scheme for quasi-static brittle fracture propagation models, where the fracture evolution is tracked by a phase field variable. The model ... -
"Jeg har aldri jobbet så mye som nå, og så får jeg en treer, liksom?" - En studie av elevers læringsstrategier og overgangsvansker i møte med Matematikk 1T
(Master thesis, 2016-11-20)Denne masteroppgaven handler om de elevene som ved overgangen fra ungdomsskolen til videregående skole opplever møtet med matematikkurset 1T som spesielt vanskelig. Elevene jeg studerer har på papiret et godt utgangspunkt ... -
Kalmanfilteret anvendt på en problemstilling innen seismikk
(Master thesis, 2009-11-25)I denne oppgaven er målet å estimere, samt predikere, posisjonen til seimikk-kabler sekvensielt. Dessuten blir det studert om målinger fra et akselerometer, festet på seismikk-kabelen, gir sikere inferens om posisjonen. -
Karakterisering av strømning gjennom en forkastning med fault facies- og standardmodell ved bruk av reservoarsimulator
(Master thesis, 2011-11-21)Forkastninger har en betydelig innvirkning på strømninger i et reservoar. Hittil har forkastninger blitt modellert som en flate eller et plan i vanlige reservoarsimulatorer, men studier har vist at forkastninger ofte må ... -
Kinetic Equation for an Electron Gas (Non-Neutral Plasma) in Strong Fields and Inhomogenities
(Department of Applied Mathematics report, Research report, 1978-06) -
Kinetic Theory for Evolution of a Plasma in External Electromagnetic Fields toward a State characterized by Balance of Forces Transverse to the Magnetic Field
(Department of Applied Mathematics report, Research report, 1973-04) -
Klasseromsforsøk om lagring av CO2 under havbunnen
(Journal article, 2010) -
Klassestørrelsens betydning for undervisningens innhold. En sammenligning av læreres undervisningspraksis i liten og stor klasse
(Master thesis, 2018-05-08)The importance of class size for the content of the teaching is a master's thesis that, using qualitative methods, tries to answer the question of how is the content of mathematics teaching in the upper secondary school ... -
A lagrangian approach to extremal curves on stiefel manifolds
(Journal article; Peer reviewed, 2021)A unified framework for studying extremal curves on real Stiefel manifolds is presented. We start with a smooth one-parameter family of pseudo-Riemannian metrics on a product of orthogonal groups acting transitively on ... -
Lagrangian dynamics for solid multi-body systems with the Moving Frame formalism
(Master thesis, 2018-12-11)Classical mechanics is the study of the motion of particles, solid bodies or of systems of bodies, and the effects of forces and moments on them. The dynamical behavior may either be studied by the application of Newtonian ...