Browsing Department of Mathematics by Title
Now showing items 120 of 689

A 3D computational study of effective medium methods applied to fractured media
(Peer reviewed; Journal article, 201310)This work evaluates and improves upon existing effective medium methods for permeability upscaling in fractured media. Specifically, we are concerned with the asymmetric selfconsistent, symmetric selfconsistent, and ... 
4D Seismic History Matching Using the Ensemble Kalman Filter (EnKF): Possibilities and Challenges
(Doctoral thesis, 20100527)This research endeavor presents a 4D seismic history matching work flow based on the ensemble Kalman filter (EnKF) methodology. The objective of this work is to investigate the sensitivity of different combinations of ... 
4D seismic history matching: Assessing the use of a dictionary learning based sparse representation method
(Journal article; Peer reviewed, 202012)It is possible to improve oilreservoir simulation models by conditioning them on 4D seismic data. Computational issues may arise related to both storage and CPU time due to the size of the 4D seismic dataset. An approach ... 
Active and integrated management of water resources throughout CO2 capture and sequestration operations
(Peer reviewed; Journal article, 2011)Most projected climate change mitigation strategies will require a significant expansion of CO2 Capture and Sequestration (CCS) in the next two decades. Four major categories of challenges are being actively researched: ... 
Adaptive asynchronous timestepping, stopping criteria, and a posteriori error estimates for fixedstress iterative schemes for coupled poromechanics problems
(Journal article; Peer reviewed, 2020)In this paper we develop adaptive iterative coupling schemes for the Biot system modeling coupled poromechanics problems. We particularly consider the space–time formulation of the fixedstress iterative scheme, in which ... 
Adaptive Characteristic Operator Splitting Techniques for ConvectionDominated Diffusion Problems in One and Two Space Dimensions
(Department of Applied Mathematics report, Research report, 198812) 
Adaptive Multiscale Methods Based on A Posteriori Error Estimates
(Master thesis, 20100601)We give an overview of different methods for solving highly heterogeneous elliptic problems with multiscale structure and no intuitive scale separation. We compare different finite element variational multiscale methods ... 
Adaptive parameterization of electric conductivity in inversion of electromagnetic data
(Master thesis, 20120601)We describe a methodology developed for 3D parameter identification, with focus on largescale applications such as monitoring subsea oil production and geothermal systems. The methodology is designed to handle challenges ... 
Advection Upscaling for Heat Transport in Fractured Geothermal Reservoir
(Master thesis, 20180620)The main objective in this thesis is to give numerical solution for advection term of heat transport equation in fractured geothermal reservoir. To get better insight in the fracture influence on the processes we will ... 
Algebra i første klasse
(Master thesis, 20151012)Oppgaven handler om algebra i første klasse. Hva er tidlig algebra og hvordan kan vi undervise på en slik måte at vi utvikler elevenes algebraiske tenkning? Tidlig algebra er ikke at vi underviser skolealgebra tidligere, ... 
Algebravansker. Hva er årsaken til at elevene syns algebra er vanskelig? Er det hull i grunnleggende kunnskap og/eller misoppfatninger hos elever på videregående skole som gjør at algebra er vanskelig for dem?
(Master thesis, 2017)I denne oppgaven kommer det fram hva årsaken og problemer elever på videregående kan ha i algebra som gjør at de syns algebra er vanskelig, og gjør det dårlig i dette emnet. Resultatene fra TIMSS Advanced i 2015 viser at ... 
An algorithm for internal morging of two subsets with small extra storage requirements.
(Department of Applied Mathematics report, Research report, 197409) 
Alternative læringsmåter for derivasjon i R1  en komparativ analyse
(Master thesis, 20160601)I denne masteroppgaven har jeg studert elever som har arbeidet med derivasjon i matematikk R1. Formålet har vært å sammenligne to alternative læringsmåter med tradisjonell oppgaveregning, med tanke på læringsutbytte på ... 
Analyse av undervisningsopplegg med undersøkende matematikk
(Master thesis, 20170726)I denne masteroppgaven ser jeg på hvilken effekt undersøkende matematikk kan ha på elevers holdninger til faget med hovedvekt på motivasjon. Prosjektene har blitt gjennomført med ungdomsskoleelever ved Stiftelsen ... 
Analysis and Approximation of Coupled 1D3D Flow Models
(Doctoral thesis, 20200318)In this thesis, we consider a specific instance of mixeddimensional partial differential equations (PDEs) commonly referred to as the coupled 1D3D flow model. The model itself consists of the Poisson equation defined on ... 
Analysis and Numerics of strongly degenerate Convectiondiffusion Problems Modelling sedimentationconsolidation Processes
(Department of Applied Mathematics report, Research report, 199909) 
Analysis of Control Volume Heterogeneous Multiscale Methods for Single Phase Flow in Porous Media
(Peer reviewed; Journal article, 2014)The standard approximation for the flowpressure relationship in porous media is Darcy's law that was originally derived for infiltration of water in fine homogeneous sands. Ever since there have been numerous attempts to ... 
Analysis of left truncated data with an application to insurance data
(Master thesis, 20090602)This thesis discusses different ways of analysing left truncated data when the lower bound itself is a stochastic variable. We will consider the possible dependence between the variable of interest and the truncating ... 
Analysis of multibeam sonar echos of herring schools by means of simulation
(Doctoral thesis; Peer reviewed, 20130531)The synchronized behavior of large schools of fish can be a fascinating sight and has caught the attention of researchers for decades. Schools of thousands, or even millions of fish can seemingly function as a single entity, ... 
Analysis of nonlinear shallow water equations discretized on Arakawa Cgrids
(Master thesis, 20160601)To model the behaviour of flow and waves in three dimensions, one may use the NavierStokes equations. These equations leads to the shallow water equations, when the depth is much smaller than the wavelength. The shallow ...