Browsing Department of Mathematics by Title

Now showing items 755-774 of 965

    • A robust solution strategy for the Cahn-Larché equations 

      Storvik, Erlend; Both, Jakub Wiktor; Nordbotten, Jan Martin; Radu, Florin Adrian (Journal article; Peer reviewed, 2023)
      In this paper we propose a solution strategy for the Cahn-Larché equations, which is a model for linearized elasticity in a medium with two elastic phases that evolve subject to a Ginzburg-Landau type energy functional. ...

    • Robust solvers for fully coupled transport and flow in saturated/unsaturated porous media 

      Illiano, Davide (Doctoral thesis, 2021-03-29)
      Numerical simulations and laboratory studies are our main tools to comprehend better processes happening in the subsurface. The phenomena are modeled thanks to systems of partial differential equations (PDEs), which are ...

    • Robusthet ved skadereservering - Chain-Ladder og influens funksjoner 

      Ones, Sindre (Master thesis, 2011-06-01)
      I denne oppgaven har jeg sett på hvordan uteliggere kan påvirke IBNR reserven i skadereservering. Jeg har studert influens funksjoner for den klassiske Chain-Ladder metoden, og videre sett at uteliggere kan påvirke ...

    • The Role of Wettability Alteration in Subsurface CO2 Storage: Modeling and Numerical Analysis 

      Kassa, Abay Molla (Doctoral thesis, 2021-12-06)
      This dissertation is aimed to provide mathematical frameworks to assess the large-scale deployment of CO2 in a subsurface formation, where the formation wettability is assumed to be altering through exposure time to the ...

    • Rolling Stiefel Manifolds Equipped with α-Metrics 

      Schlarb, Markus; Hüper, Knut; Markina, Irina; Silva Leite, Fátima (Journal article; Peer reviewed, 2023)
      We discuss the rolling, without slipping and without twisting, of Stiefel manifolds equipped with 𝛼-metrics, from an intrinsic and an extrinsic point of view. We, however, start with a more general perspective, namely, ...

    • Rotational effects on exchange flows across a submerged sill 

      Cuthbertson, A.; Berntsen, Jarle Peder; Laanearu, J.; Asplin, Magdeli (Journal article; Peer reviewed, 2021)
      This paper presents new laboratory-scale numerical simulations of density-driven exchange flows generated across an idealised, submerged sill obstruction under both non-rotating and rotating frames of reference using the ...

    • Ruin probability and optimal dividend policy for models with investment 

      Hunting, Martin (Doctoral thesis, 2012-11-06)
      In most countries the authorities impose capital requirements on insurance companies in order to avoid the adverse consequences to society when insurance companies default on claims. Since holding capital is costly, this ...

    • S100A4 mRNA-protein relationship uncovered by measurement noise reduction 

      Athanasiou, Angelos-Theodoros; Nussbaumer, T; Kummer, Stefan; Hofer, Martin; Johnston, Iain; Staltner, Moritz; Allmer, Daniela M.; Scott, Milcah C.; Vogl, Claus; Fenger, Joelle M.; Modiano, Jaime F.; Walter, Ingrid; Steinborn, Ralf (Journal article; Peer reviewed, 2020)
      Intrinsic biological fluctuation and/or measurement error can obscure the association of gene expression patterns between RNA and protein levels. Appropriate normalization of reverse-transcription quantitative PCR (RT-qPCR) ...

    • Sammenhenger mellom koder, matroider, grafer og simplisielle komplekser 

      Heiseldal, Bård (Master thesis, 2008)
      Denne masteroppgaven handler hovedsakelig om å studere sammenhenger mellom ulike em- ner innen algebra og kombinatorikk. De matematiske konseptene som studeres, er lineære koder, matroider, grafer og simplisielle komplekser, ...

    • Sampling error distribution for the ensemble Kalman filter update step 

      Kovalenko, Andrey; Mannseth, Trond; Nævdal, Geir (Peer reviewed; Journal article, 2012)
      In recent years, data assimilation techniques have been applied to an increasingly wider specter of problems. Monte Carlo variants of the Kalman filter, in particular, the ensemble Kalman filter (EnKF), have gained significant ...

    • Scene Reconstruction Using Level Sets and Graph Cuts 

      Knudsen, Ørjan (Master thesis, 2009-07-17)

    • Screening for Circulating Inflammatory Proteins Does Not Reveal Plasma Biomarkers of Constant Tinnitus 

      Cederroth, Christopher R.; Hong, Mun-Gwan; Freydin, Maxim B.; Edvall, Niklas K.; Trpchevska, Natalia; Jarach, Carlotta; Schlee, Winfried; Schwenk, Jochen M.; Lopez-Escamez, Jose-Antonio; Gallus, Silvano; Canlon, Barbara; Bulla, Jan; Williams, Frances M. K. (Journal article; Peer reviewed, 2023)
      Background and Objective Tinnitus would benefit from an objective biomarker. The goal of this study is to identify plasma biomarkers of constant and chronic tinnitus among selected circulating inflammatory proteins. ...

    • Scroll codes over curves of higher genus 

      Johnsen, Trygve; Rasmussen, Nils Henry (Peer reviewed; Journal article, 2010)
      We construct linear codes from scrolls over curves of high genus and study the higher support weights di of these codes. We embed the scroll into projective space Pk-1 and calculate bounds for the di by considering the ...

    • Segmentation of data traces with applications to dipmeter oil well measurements 

      Karlsen, Hans; Tjøstheim, Dag (Statistical report no. 18, Research report, 1988-02)

    • Selection for biparental inheritance of mitochondria under hybridization and mitonuclear fitness interactions 

      Allison, Tom M.; Radzvilavicius, Arunas; Dowling, Damian K. (Journal article; Peer reviewed, 2021)
      Uniparental inheritance (UPI) of mitochondria predominates over biparental inheritance (BPI) in most eukaryotes. However, examples of BPI of mitochondria, or paternal leakage, are becoming increasingly prevalent. Most ...

    • Semi-conditional variational auto-encoder for flow reconstruction and uncertainty quantification from limited observations 

      Gundersen, Kristian; Oleynik, Anna; Blaser, Nello; Alendal, Guttorm (Journal article; Peer reviewed, 2021)
      We present a new data-driven model to reconstruct nonlinear flow from spatially sparse observations. The proposed model is a version of a Conditional Variational Auto-Encoder (CVAE), which allows for probabilistic ...

    • Semiparametric model selection for copulas 

      Jordanger, Lars Arne (Master thesis, 2013-06-03)
      This thesis will consider the performance of the cross-validation copula information criterion, xv-CIC, in the realm of finite samples. The theory leading to the xv-CIC will be outlined, and an analysis will be conducted ...

    • Sequential Data Assimilation in High Dimensional Nonlinear Systems 

      Stordal, Andreas Størksen (Doctoral thesis, 2011-10-21)
      Since its introduction in 1994, the ensemble Kalman filter (EnKF) has gained a lot of attention as a tool for sequential data assimilation in many scientific areas. Due to its computationally fast and easy to implement ...

    • Sequential Monte Carlo Methods for Bayesian Filtering 

      Stordal, Andreas Størksen (Master thesis, 2008)

    • Sequential multilevel assimilation of inverted seismic data 

      Nezhadali, Mohammad; Bhakta, Tuhin; Fossum, Kristian; Mannseth, Trond (Journal article; Peer reviewed, 2023)
      We consider estimation of absolute permeability from inverted seismic data. Large amounts of simultaneous data, such as inverted seismic data, enhance the negative effects of Monte Carlo errors in ensemble-based Data ...