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PAH og PCB i byjord fra Dublin: Kilder og forurensningsstatus
(Master thesis, 2010)I denne oppgaven ble det samlet inn 196 prøver av byjord fra Dublin. Spredningen av prøvenes lokaliteter ble lagt slik at den skulle gi et bilde av hele Dublin og dens forsteder, med et hovedfokus på sentrum. Prøvene ble ... -
Pair Correlation estimates for the zeros of the zeta function via semidefinite programming
(Peer reviewed; Journal article, 2020)In this paper we study the distribution of the non-trivial zeros of the Riemann zeta-function ζ(s) (and other L-functions) using Montgomery's pair correlation approach. We use semidefinite programming to improve upon ... -
Paper-based electronic voting
(Master thesis, 2015)In this thesis, we present two paper-based electronic voting systems Prêt-à-Voter and Demos. We describe these in the same systematic way with new examples. Furthermore, we implement RSA cryptosystem in Prêt-à-Voter. Then, ... -
Paper-based electronic voting
(Master thesis, 2015)In this thesis, we present two paper-based electronic voting systems Prêt-à-Voter and Demos. We describe these in the same systematic way with new examples. Furthermore, we implement RSA cryptosystem in Prêt-à-Voter. Then, ... -
Parallel Multiple Proposal MCMC Algorithms
(Master thesis, 2007)We explore the variance reduction achievable through parallel implementation of multi-proposal MCMC algorithms and use of control variates. Implemented sequentially multi-proposal MCMC algorithms are of limited value, but ... -
Parallel Solutions of Stochastic Differential Equations
(Master thesis, 2015)The main purpose of this work was to develop a more time efficient solution to the Lotka- Volterra model. To compare runtimes, in addition to the serial version, the algorithm was implemented using the Message Passing ... -
Parallelization of some scientific codes using profiling tools and OpenMP
(Research report, 2009)The purpose of this report is to exchange our experience with parallelizing existing scientific codes by utilizing profiling tools and the OpenMP application programming interface (API) for multi-platform shared-memory ... -
Parameter estimation in a Markov mesh model by reversible jump MCMC simulation
(Master thesis, 2012)We have a model for simulating facies values in a rock. We can use the model to find facies structures in a 2-dimensional area, which we can use to find properties of a rock in a petroleum reservoir. The model is a Markov ... -
Parameter estimation in convolved categorical models
(Master thesis, 2010)In this thesis, we solve the seismic inverse problem in a Bayesian setting and perform the associated model parameter estimation. The subsurface rock layers are represented by categorical variables, which depends on some ... -
Parameter Estimation in Extreme Value Models with Markov Chain Monte Carlo Methods
(Master thesis, 2010)In this thesis I have studied how to estimate parameters in an extreme value model with Markov Chain Monte Carlo (MCMC) given a data set. This is done with synthetic Gaussian time series generated by spectral densities, ... -
Parameter selection for total variation regularization with applications in imaging
(Master thesis, 2020)Regulariseringsmetoder er ofte brukt for å løse inverse problemer. Spesielt har total variasjon- regulering vist seg å være effektiv for støyfjerning av bilder. Regulariseringsmetoder kr- ever vanligvis valg av én eller ... -
Parameter selection methods for variational image restoration
(Master thesis, 2021)Vi undersøker diskrepansprinsippet og ein L-hyperflate-metode som automatiserte parametervalmetodar i støyfjerningsproblem for bilete. Å velje optimale regulariseringsparametrar er alltid utfordrande, og utfordringa er ... -
Parametric spatial covariance models in the ensemble Kalman filter
(Peer reviewed; Journal article, 2019)Several applications rely on data assimilation methods for complex spatio-temporal problems. The focus of this paper is on ensemble-based methods, where some approaches require estimation of covariances between state ... -
Parametric Wavelet Estimation
(Master thesis, 2014)A method for parametric estimation of seismic wavelets from well logs and seismic data is developed. Parameters include amplitude, skewness, length and fluctuation order, and the link between parameters and wavelet properties ... -
Parametrization of multi-dimensional Markov chains for rock type modeling
(Master thesis, 2009)A parametrization of a multidimensional Markov chain model (MDMC) is studied with the goal of capturing texture in training images. The conditional distribution function of each row in the image, given the previous rows, ... -
Parasite prevalence increases with temperature in an avian metapopulation in northern Norway
(Peer reviewed; Journal article, 2019)Climate and weather conditions may have substantial effects on the ecology of both parasites and hosts in natural populations. The strength and shape of the effects of weather on parasites and hosts are likely to change ... -
Partial Orders in Representation Theory of Algebras
(Master thesis, 2008)In this paper we investigate some partial orders used in representation theory of algebras. Let $K$ be a commutative ring, $Lambda$ a finitely generated $K$-algebra and $d$ a natural number. We then study partial orders ... -
Partial Serre duality and cocompact objects
(Journal article, 2023) -
Particle Filtering Approaches for Atlantic Salmon Migration Based on Acoustic Telemetry Data
(Master thesis, 2020)Overlevelsesraten til migrerende laksesmolt kan reduseres på grunn av lakselussmitte. Den kan gjøre smolten mer sårbar overfor rovdyr og øke risikoen for å bli smittet av andre sykdommer. Innsikt i hvor smolten befinner ... -
Passivity-preserving splitting methods for rigid body systems
(Journal article, 2018)A rigid body model for the dynamics of a marine vessel, used in simulations of offshore pipe-lay operations, gives rise to a set of ordinary differential equations with controls. The system is input–output passive. We ...