Viser treff 41-60 av 94

• #### Mathematical Imaging with Applications to MRI and Diffusion Tensor MRI ﻿

(Doctoral thesis, 2007-03-26)
• #### Mathematical modeling of microbial enhanced oil recovery with focus on bio-plug technology: from the pore to the core scale ﻿

(Doctoral thesis, 2019-06-14)
This dissertation addresses the applications and challenges of both laboratory experiments and mathematical modeling at different scales, where the main character is biofilm. Thus, the first part of this work shows biological, ...
• #### Mathematical Segmentation and Denoising of Images with Applications to MRI and Diffusion Tensor MRI ﻿

(Doctoral thesis, 2008-02-01)
In medicine digital images play a vital role in both research and clinical work. Using advanced techniques like Magnetic Resonance Imaging (MRI), Computertomografi (CT), Positron Emission Tomography (PET) or X-ray, images ...
• #### Mathematics in everyday life A study of beliefs and actions ﻿

(Doctoral thesis, 2006-03-29)
• #### Methods and Tools for Analysis of Symmetric Cryptographic Primitives ﻿

(Doctoral thesis, 2014-12-01)
The development of modern cryptography is associated with the emergence of computing machines. Since specialized equipment for protection of sensitive information was initially implemented only in hardware, stream ciphers ...
• #### Model development for efficient simulation of CO2 storage ﻿

(Doctoral thesis, 2018-02-16)
Carbon capture and storage (CCS) is an important component of several initiatives to reduce global greenhouse gas emissions by injecting and storing CO2 in underground reservoirs. Simulation technology plays an important ...
• #### Modeling of heat transfer in porous media in the context of geothermal energy extraction ﻿

(Doctoral thesis, 2015-10-02)
This dissertation concerns mathematical modeling related to heat transfer in the subsurface relevant for geothermal energy extraction. Two applications are considered: First, natural convection in a homogeneous porous ...
• #### Modeling of Multi Phase Flow in Porous Media: Operator Splitting, Front Tracking, Interfacial Area and Network Models ﻿

(Doctoral thesis, 2001-12-20)
In this work several new numerical methods and a new mathematical model related to multi phase flow in oil reservoirs have been developed, implemented and tested. The numerical difficulties in multi phase flow stem from ...
• #### Modelling and simulation of thermo-hydro-mechanical processes in fractured porous media ﻿

(Doctoral thesis, 2021-02-26)
Understanding and predicting processes in fractured porous media is of wide interest, with applications such as geothermal energy extraction, water management and storage of CO$_2$ and energy. Characterisation and monitoring ...
• #### Modelling of Three-Phase Flow Functions for Applications in Enhanced Oil Recovery ﻿

(Doctoral thesis, 2009-05-22)
• #### Multiscale analysis of selected problems in fluid dynamics ﻿

(Doctoral thesis, 2017-02-03)
The world around us is inherently multiscale. The variety of different models depending on the reference scale is particularly diverse in problems of fluid-solid systems. For those systems, the geometry, effective parameters ...
• #### Multiscale simulation of flow and heat transport in fractured geothermal reservoirs ﻿

(Doctoral thesis; Peer reviewed, 2013-03-04)
• #### Multivariate and conditional density estimation using local Gaussian approximations ﻿

(Doctoral thesis, 2016-09-23)
Paper 1 ”Bias and bandwidth for local likelihood density estimation”: A local likelihood density estimator is shown to have asymptotic bias depending on the dimension of the local parameterization. Comparing with kernel ...
• #### Nonholonomic geometry on finite and infinite dimensional Lie groups and rolling manifolds ﻿

(Doctoral thesis, 2012-03-30)
Part I: We start by giving some background on the topics discussed in this thesis. The main topic of the thesis is nonholonomic geometry. In Chapter 1 we give an introduction of nonholonomic geometry in the context of ...
• #### Nonhydrostatic pressure in ocean models with focus on wind driven internal waves ﻿

(Doctoral thesis, 2010-02-05)
• #### Nonlinear Spectrum Analysis based on the Local Gaussian Correlation and Model Selection for Copulas ﻿

(Doctoral thesis, 2017-11-20)
• #### Numerical methods for coupled processes in fractured porous media ﻿

(Doctoral thesis, 2019-11-15)
Numerical simulations have become essential in the planning and execution of operations in the subsurface, whether this is geothermal energy production or storage, carbon sequestration, petroleum production, or wastewater ...
• #### Numerical modeling of shear stimulation in naturally fractured geothermal reservoirs ﻿

(Doctoral thesis, 2018-03-22)
Shear-dilation-based hydraulic stimulations are conducted to create enhanced geothermal systems (EGS) from low permeable geothermal reservoirs, which are initially not amenable to energy production. Reservoir stimulations ...
• #### Numerical solutions of two-phase flow with applications to CO2 sequestration and polymer flooding ﻿

(Doctoral thesis, 2014-12-19)
This thesis addresses challenges related to mathematical and numerical modeling of flow in porous media. To address these challenges, two applications are considered: firstly, counter-current two-phase flow in a heterogeneous ...
• #### Numerical Tools for Multicomponent, Multiphase, Reactive Processes: Flow of CO2 in Porous Medium ﻿

(Doctoral thesis, 2006-06-02)