Browsing Department of Mathematics by Title
Now showing items 756-775 of 1053
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PoroTwin: A Digital Twin for a FluidFlower Rig
(Journal article; Peer reviewed, 2023)We present a framework for integrated experiments and simulations of tracer transport in heterogeneous porous media using digital twin technology. The physical asset in our setup is a meter-scale FluidFlower rig. The digital ... -
Portfolio allocation under asymmetric dependence in asset returns using local Gaussian correlations
(Journal article; Peer reviewed, 2021)It is well known that there are asymmetric dependence structures between financial returns. This paper describes a portfolio selection method rooted in the classical mean–variance framework that incorporates such asymmetric ... -
Portfolio Optimization and Diversification Benefits: A Local Gaussian Correlation Approach
(Master thesis, 2019-06-22) -
Portfolio Optimization in a Lévy Market with Intertemporal Substitution and Transaction Costs
(Department of Applied Mathematics report, Research report, 2000-05) -
Portfolio Optimization with PCC-GARCH-CVaR model
(Master thesis, 2014-06-02)This thesis investigates the Conditional Value-at-Risk (CVaR) portfolio optimization approach combined with a univariate GARCH model and pair-copula constructions (PCC) to determine the optimal asset allocation for a ... -
Post-lie algebras and isospectral flows
(Peer reviewed; Journal article, 2015-11-20)In this paper we explore the Lie enveloping algebra of a post-Lie algebra derived from a classical R-matrix. An explicit exponential solution of the corresponding Lie bracket flow is presented. It is based on the solution ... -
A posteriori error estimates for hierarchical mixed-dimensional elliptic equations
(Journal article; Peer reviewed, 2022)Mixed-dimensional elliptic equations exhibiting a hierarchical structure are commonly used to model problems with high aspect ratio inclusions, such as flow in fractured porous media. We derive general abstract estimates ... -
A posteriori error estimation and adaptivity for multiple-network poroelasticity
(Journal article; Peer reviewed, 2023)The multiple-network poroelasticity (MPET) equations describe deformation and pressures in an elastic medium permeated by interacting fluid networks. In this paper, we (i) place these equations in the theoretical context ... -
A posteriori error estimation and modeling of unsaturated flow in fractured porous media
(Doctoral thesis, 2022-06-17)This doctoral thesis focuses on three topics: (1) modeling of unsaturated flow in fractured porous media, (2) a posteriori error estimation for mixed-dimensional elliptic equations, and (3) contributions to open-source ... -
Postinjection Normal Closure of Fractures as a Mechanism for Induced Seismicity
(Peer reviewed; Journal article, 2017-10-04)Understanding the controlling mechanisms underlying injection-induced seismicity is important for optimizing reservoir productivity and addressing seismicity-related concerns related to hydraulic stimulation in Enhanced ... -
Potensialet for dyp geotermisk energi i Norge: Modellering av varmeutvinning fra konstruerte geotermiske system
(Master thesis, 2010-10-05)Dette prosjektet tar for seg to ulike modeller for et konstruert geotermisk system; et lukket enkeltbrønn-system og et åpent, sprekkdominert system. Enkeltbrønn-systemet er modellert eksplisitt, og modellen er også tilpasset ... -
Practical approaches to study microbially induced calcite precipitation at the field scale
(Journal article; Peer reviewed, 2021)Microbially induced calcite precipitation (MICP) is a new and sustainable technology which utilizes biochemical processes to create barriers by calcium carbonate cementation; therefore, this technology has a potential to ... -
Pre- and post-lie algebras: The algebro-geometric view
(Peer reviewed; Journal article, 2019)We relate composition and substitution in pre- and post-Lie algebras to algebraic geometry. The Connes-Kreimer Hopf algebras and MKW Hopf algebras are then coordinate rings of the infinite-dimensional affine varieties ... -
Precision identification of high-risk phenotypes and progression pathways in severe malaria without requiring longitudinal data
(Peer reviewed; Journal article, 2019)More than 400,000 deaths from severe malaria (SM) are reported every year, mainly in African children. The diversity of clinical presentations associated with SM indicates important differences in disease pathogenesis that ... -
Preconditioning for Flow in Fractured Porous Media
(Doctoral thesis, 2020-01-24)The key to reliable simulations of flow in fractured porous media is the proper design, analysis and implementation of numerical methods. These methods should take into account the specific properties of the underlying ... -
Prevalence of molar incisor hypomineralization among school children in Rome, Italy
(Journal article; Peer reviewed, 2022)Molar incisor hypomineralization (MIH) is a highly prevalent condition associated with increased caries experience, dental pain and treatment need. Aim of this study was to determine the prevalence and severity of MIH in ... -
Probability distributions of surface gravity waves during spectral changes
(Peer reviewed; Journal article, 2005-11) -
Problemløsing i et tenkende klasserom
(Master thesis, 2023-06-01)Samfunnet er i rask endring. Det tydeliggjør viktigheten av at elevene utvikler ferdigheter innenfor samarbeid, problemløsing og utforskning (NOU 2015:8, , s. 7-10). Dette er ferdigheter som virker å samsvare med det som ... -
Problemløsning i norske og russiske matematikklærebøker for videregående skole. En sammenlignende studie av eksempler i norske og russiske lærebøker
(Master thesis, 2016-01-17)Denne masteroppgaven sammenligner lærebøkene fra to land, Norge og Russland, i emneområder Algebra og Funksjoner, og fokuserer på problemløsningsmetoder i eksemplene i de norske og de russiske lærebøkene for videregående ... -
Progagation of Shallow Water Inertia-Gravity Waves with Fractional Step Methods
(Department of Applied Mathematics report, Research report, 1995-07)