Browsing Department of Mathematics by Title
Now showing items 465-484 of 1152
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Investigating the Asymmetric Behavior of Oil Price Volatility Using Support Vector Regression
(Journal article; Peer reviewed, 2022)This paper investigates the asymmetric behavior of oil price volatility using different types of Asymmetric Power ARCH (APARCH) model. We compare the estimation and forecasting performance of the models estimated from the ... -
Investigation of long-wave model equations for a liquid CO2-seawater interface in deep water
(Master thesis, 2017-11-04) -
Investigations of the Kaup-Boussinesq model equations for water waves
(Master thesis, 2014-06-02)The Kaup-Boussinesq system is a coupled system of nonlinear partial differential equations which has been derived as a model for surface waves in the context of the Boussinesq scaling, and it has also been derived for an ... -
Investigations of the Modified Navier-Stokes Equations in One Dimension
(Master thesis, 2014-06-02)In this thesis we have investigated the Brenner-Navier-Stoke equations in one spatial dimension. These are a modified version of the Navier-Stokes equations, where the modification relates to a mass diffusion term. This ... -
Irreducible unirational and uniruled components of moduli spaces of polarized Enriques surfaces
(Journal article; Peer reviewed, 2023)We prove that infinitely many irreducible components of the moduli space of polarized Enriques surfaces are unirational (resp. uniruled), characterizing them in terms of decompo- sitions of the polarization as an effective ... -
Is chronic low back pain a risk factor for diabetes? The Nord-Trøndelag Health Study
(Peer reviewed; Journal article, 2018)Objective: The purpose of this study was to examine the risk of diabetes associated with the presence or absence of chronic low back pain, considering both cross-sectional and cohort data. Research design and methods: ... -
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 methods for solving the Multiple Network Poroelastic Theory (MPET) model
(Master thesis, 2022-01-17) -
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 ... -
Itererte modular og linne n-kategoriar
(Master thesis, 2023-06-01)Me ser på iterasjon av operasjonen "(dei endeleg-genererte frie) modulane til" med utgangspunkt i ein kommutativ rig, altså ein kommutativ ring som ikkje nødvendigvis har additive inversar. I første omgang dannar desse ... -
"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 ...