Browsing Department of Mathematics by Title
Now showing items 120 of 320

A 3D computational study of effective medium methods applied to fractured media
(Springer, 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 ...Journal article 
4D Seismic History Matching Using the Ensemble Kalman Filter (EnKF): Possibilities and Challenges
(The University of Bergen, 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 ...Doctoral thesis 
Active and integrated management of water resources throughout CO2 capture and sequestration operations
(Elsevier, 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: ...Journal article 
Adaptive Multiscale Methods Based on A Posteriori Error Estimates
(The University of Bergen, 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 ...Master thesis 
Adaptive parameterization of electric conductivity in inversion of electromagnetic data
(The University of Bergen, 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 ...Master thesis 
Algebra i første klasse
(The University of Bergen, 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, ...Master thesis 
Alternative læringsmåter for derivasjon i R1  en komparativ analyse
(The University of Bergen, 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 ...Master thesis 
Analysis of left truncated data with an application to insurance data
(The University of Bergen, 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 ...Master thesis 
Analysis of multibeam sonar echos of herring schools by means of simulation
(The University of Bergen, 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 ...Doctoral thesis 
Analysis of nonlinear shallow water equations discretized on Arakawa Cgrids
(The University of Bergen, 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 ...Master thesis 
An Analysis of the Corner Velocity Interpolation as the Approximation Space in a Mixed Finite Element Method
(The University of Bergen, 2008)Master thesis 
Analytical Methods for Upscaling of Fractured Geological Reservoirs
(The University of Bergen, 20151016)Numerical simulations have become an essential tool for planning well operations in the subsurface, whether the application is petroleum production, geothermal energy, groundwater utilization or waste disposal and leakage. ...Doctoral thesis 
Application of VerticallyIntegrated Models with Subscale Vertical Dynamics to Field Sites for CO2 Sequestration
(Elsevier, 2014)To address the engineering questions on security issues of geological carbon sequestration (GCS), a broad range of computational models with different levels of complexity have been developed  from multiphase multicomponent ...Journal article 
An Approach for Investigation of Geochemical RockFluid Interactions
(Stanford University, 2014)Geochemistry has a substantial impact in exploiting of geothermal systems. When water is injected in a geothermal reservoir, the injected water and insitu brine have different temperatures and chemical compositions and ...Conference object 
An approximate hybrid method for modeling of electromagnetic scattering from an underground target
(The University of Bergen, 20101209)The detection of a potential petroleum reservoir is achieved through inversion of electromagnetic data acquired in sea floor receivers. Inversion of electromagnetic data requires a number of repeated solves of the ...Doctoral thesis 
Arachnoid cysts do not contain cerebrospinal fluid: A comparative chemical analysis of arachnoid cyst fluid and cerebrospinal fluid in adults
(BioMed Central, 20100610)Background Arachnoid cyst (AC) fluid has not previously been compared with cerebrospinal fluid (CSF) from the same patient. ACs are commonly referred to as containing "CSFlike fluid". The objective of this study was to ...Journal articlePeer reviewed 
Assessing Model Uncertainties Through Proper Experimental Design
(Elsevier, 2013)This paper assesses how parameter uncertainties in the model for rise velocity of CO2 droplets in the ocean cause uncertainties in their rise and dissolution in marine waters. The parameter uncertainties in the rise velocity ...Journal article 
Assessment of Sequential and Simultaneous Ensemblebased History Matching Methods for Weakly Nonlinear Problems
(The University of Bergen, 20150213)The ensemble Kalman filter (EnKF) has, since its introduction in 1994, gained much attention as a tool for sequential data assimilation in many scientific areas. In recent years, the EnKF has been utilized for estimating ...Doctoral thesis 
Association between body height and chronic low back pain: a followup in the NordTrøndelag Health Study
(BMJ, 20150615)Objective: To study potential associations between body height and subsequent occurrence of chronic low back pain (LBP). Design: Prospective cohort study. Setting: The NorthTrøndelag Health Study (HUNT). Data ...Journal article 
Auxiliary variables for 3D multiscale simulations in heterogeneous porous media
(Elsevier, 20130401)The multiscale controlvolume methods for solving problems involving flow in porous media have gained much interest during the last decade. Recasting these methods in an algebraic framework allows one to consider them ...Journal article