Blar i Faculty of Mathematics and Natural Sciences på dokumenttype "Doctoral thesis"
Viser treff 1-20 av 858
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3D seismic stratigraphy and reservoir characterization of the Chalk Group in the Norwegian Central Graben, North Sea
(Doctoral thesis, 2011-12-08) -
3D stochastic modelling of fault zones in siliciclastic reservoirs. Implications for reservoir description and fluid flow modelling
(Doctoral thesis, 2014-12-16)Fault zones in siliciclastic rocks form distinct volumetric entities and typically exhibit great structural complexity. While it has been considered that the main impact of fault zones to fluid flow is to baffle or block ... -
4D Seismic History Matching Using the Ensemble Kalman Filter (EnKF): Possibilities and Challenges
(Doctoral thesis, 2010-05-27)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 ... -
Abrupt changes in sea ice and dynamics of Dansgaard-Oeschger events
(Doctoral thesis, 2017-12-01)Changes in sea ice are proposed as an important component in Dansgaard-Oeschger events; the abrupt climate change events that occurred repeatedly during the last ice age. Paleoclimatic reconstructions suggest an expansion ... -
Abstractions for Language-Independent Program Transformations
(Doctoral thesis, 2007-06-27) -
Acoustic measurement of liquid density with applications for mass measurement of oil
(Doctoral thesis, 2007-11-23) -
Acoustic Propagation Underneath the Arctic Sea-ice
(Doctoral thesis, 2018-10-04)The main objective of this project is to study the effect of sea-ice on underwater acoustic wave propagation. Three main parameters define how acoustic waves react to the presence of seaice: (i) the roughness of the underside ... -
Adaptation of anemonefish to their host anemones: From Genetics to Physiology
(Doctoral thesis, 2020-02-21)The mutualism between anemonefish and anemones can be studied in terms of permanent or temporary adaptation of fish toward their host anemones. This thesis explores this theme, and aims to test (1) Whether a mutual ... -
Adjoint Modeling and Observing System Design in the Subpolar North Atlantic
(Doctoral thesis, 2019-08-30)The near-surface ocean currents of the subpolar North Atlantic transport large amounts of heat from the subtropics to higher latitudes, affecting Arctic sea ice extent, the melting of the Greenland Ice Sheet, and the climate ... -
Advancing the Capabilities of Numerical Weather Prediction - On the Utility of Individual Tendency Output
(Doctoral thesis, 2022-11-18)Parametrisering i numeriske værmodeller representerer finskalaprosesser i atmosfæren på subgridnivå. Disse atmosfæriske prosessene inkluderer turbulens, stråling og dråpeformasjon i skyer. Enhver parametrisering er en ... -
Air-Sea Interaction in Biophysical Modeling: With focus on Northeast Arctic Cod
(Doctoral thesis, 2019-02-15)The focus of this thesis is on upper ocean dynamics and the interactions between the atmosphere and the oceans in relation to early life stages of Northeast Arctic cod. The main spawning sites of Northeast Arctic cod are ... -
Aircraft and spacecraft observations of high-energy radiation associated with lightning leaders
(Doctoral thesis, 2022-10-03)Denne avhandlingen undersøker røntgen og gammastråling assosiert med lyn ledere, observert av instrumenter på fly og fra verdensrommet. Avhandlingen består av tre forskningsartikler, publisert i Journal of Geophysical ... -
Algebraic Cryptanalysis of Cryptographic Schemes with Extension Field Structure
(Doctoral thesis, 2021-09-06)Post-Quantum Cryptography studies cryptographic algorithms that quantum computers cannot break. Recent advances in quantum computing have made this kind of cryptography necessary, and research in the field has surged over ... -
Algorithmic Complexity of Clustering and Low-Rank Approximation Problems
(Doctoral thesis, 2021-03-29)The two most popular unsupervised learning problems are k-Clustering and Low-Rank Approximation. Consider a set of n datapoints, in the k-Clustering problem, the objective is to partition these points into k clusters and ... -
Ambient noise levels, QLg wave tomography and earthquake source parameters in Norway
(Doctoral thesis, 2019-04-05)Norway is part of an intraplate environment and therefore experiences low to intermediate seismicity. This seismicity is a response to the stress eld in the lithosphere, which is mainly in uenced by ridge push from the ... -
Anaesthesia of farmed fish with special empasis on atlantic cod (Gadus morhua) and atlantic habibut (Hippoglossus hippoglossus)
(Doctoral thesis, 2011-03-23)During the life cycle as farmed animals there are numerous situations where fish are subjected to handling and confinement. Netting, weighing, sorting, vaccination, transport and, at the end, slaughter are common events ... -
Analysis and Approximation of Coupled 1D-3D Flow Models
(Doctoral thesis, 2020-03-18)In this thesis, we consider a specific instance of mixed-dimensional partial differential equations (PDEs) commonly referred to as the coupled 1D-3D flow model. The model itself consists of the Poisson equation defined on ... -
Analysis and Development of Phenomenological Models for the Relative Biological Effectiveness in Proton Therapy
(Doctoral thesis, 2019-08-23)Proton therapy is undergoing a rapid development making it increasingly popular as a treatment of cancer. Protons interact differently with the tissue compared to conventional radiation therapy with photons, resulting in ... -
Analysis of IgM sub-variants related to ancestral tetraploidy in salmonid fish
(Doctoral thesis, 2013-03-21)Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) possess two paralogous IgM heavy chain (μ) genes related to ancestral tetraploidy. Accordingly, IgM subpopulations of Atlantic salmon and brown trout can be ... -
Analysis of multi-beam sonar echos of herring schools by means of simulation
(Doctoral thesis, 2013-05-31)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, ...