Blar i Department of Mathematics på tittel
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Quality of the Analysis Step in EnKF
(Master thesis, 2011-06-15)In many physical applications we want to characterize the parameters of a system based on indirect observations or measurements. In a reservoir simulator setting, the goal is to simulate the production of hydrocarbons from ... -
Quantifying uncertainties when monitoring marine environments in connection with geological storage of CO2
(Doctoral thesis, 2015-06-26) -
Quenched invariance principle for random walks on dynamically averaging random conductances
(Journal article; Peer reviewed, 2021)We prove a quenched invariance principle for continuous-time random walks in a dynamically averaging environment on Z. In the beginning, the conductances may fluctuate substantially, but we assume that as time proceeds, ... -
Radial processes for sub-Riemannian Brownian motions and applications
(Journal article; Peer reviewed, 2020)We study the radial part of sub-Riemannian Brownian motion in the context of totally geodesic foliations. Itô’s formula is proved for the radial processes associated to Riemannian distances approximating the Riemannian ... -
Radielle basisfunksjoner som adaptiv kollokasjonsmetode
(Master thesis, 2014-06-01)Hensikten med oppgaven er å undersøke en adaptiv kollokasjonsmetode basert på radielle basisfunksjoner. Målet er å finne ut om man med enkle kriterier for senter- og formparameterfordelingen kan oppnå en fordeling som ... -
A random exchange model with constant decrements.
(Department of Applied Mathematics report, Research report, 1974-12) -
Rate of Convergence for some constraint Dcomposition methods for nonlinear variational inequalities.
(Department of Applied Mathematics report, Research report, 2000-10) -
Rate of Convergence for Subspace Correction Methods for nonlinear Variational Inequalities
(Department of Applied Mathematics report, Research report, 1999-09) -
Rate of Convergence of a Space Decomposition method and Applications to Linear and Nonlinear Elliptic Problems
(Department of Applied Mathematics report, Research report, 1996-09) -
Reactivation of fractures in subsurface reservoirs - A numerical approach using a static-dynamic friction model
(Chapter; Peer reviewed; Journal article, 2019)Fluid-induced slip of fractures is characterized by strong multiphysics couplings. Three physical processes are considered: Flow, rock deformation and fracture deformation. The fractures are represented as lower-dimensional ... -
Reactive Transport in Porous Media
(Master thesis, 2011-08-01)In this thesis, we show how the common equations for flow in porous media can be expanded to account for geochemical reactions. Furthermore, the complications arising when solving the new equations numerically are described ... -
Reconstructing Open Surfaces via Graph-Cuts
(2011)A novel graph-cuts-basedmethod is proposed for reconstructing open surfaces from unordered point sets. Through a boolean operation on the crust around the data set, the open surface problem is translated to a watertight ... -
Recursions for Convolutions of discrete uniform Distributions revisited
(Statistical report no. 32, Research report, 1997-09) -
Reducing the domination number of graphs via edge contractions and vertex deletions
(Journal article; Peer reviewed, 2021)In this work, we study the following problem: given a connected graph G, can we reduce the domination number of G by at least one using k edge contractions, for some fixed integer k>0? We show that for k=1 (resp. k=2), the ... -
Reexamining CO2 Storage Capacity and Utilization of the Utsira Formation
(Conference object, 2014)In this work we provide estimates of CO2 storage capacity of the Utsira Formation using the recently provided datasets from the Norwegian Petroleum Directorate, taking CO2 density variation into account. We also investigate ... -
Regresjonsmodeller i skipsforsikring
(Master thesis, 2009-09-15)Masteroppgaven tar utgangspunkt i et datasett fra skipsforsikring og undersøker hva slags modeller som passer til skadefrekvensen for dette datasettet. Hovedfokuset for masteroppgaven vil være på generalisert lineært miksede ... -
Rekneark på ungdomstrinnet
(Master thesis, 2014-06-06)Problemstillinga i oppgåva var korleis opplever elevane bruk av rekneark i matematikk på ungdomstrinnet. Gjennom eitt år vart ulike reknearkoppgåver prøvd ut i 9./10. klasse. I etterkant henta eg inn data ved hjelp av ... -
Relationship between headaches and tinnitus in a Swedish study
(Journal article; Peer reviewed, 2020-05)The heterogeneity of tinnitus is likely accounting for the lack of effective treatment approaches. Headaches have been related to tinnitus, yet little is known on how headaches impact tinnitus. We use cross-sectional data ... -
Renal Function Estimation using Magnetic Resonance Images
(Master thesis, 2009-06-02)This study is aimed at testing the use of Magnetic Resonance (MR) images and mathematical models for renal parameter estimation. The study was based on four models; the Patlak model, Cortical Compartment model, Separable ...