Blar i Department of Mathematics på tittel
Viser treff 652-671 av 932
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Parameter estimation with the augmented Lagrangian method for a parabolic equation.
(Department of Applied Mathematics report, Research report, 2001-01) -
Parsimonious hidden Markov models for matrix-variate longitudinal data
(Journal article; Peer reviewed, 2022)Hidden Markov models (HMMs) have been extensively used in the univariate and multivariate literature. However, there has been an increased interest in the analysis of matrix-variate data over the recent years. In this ... -
Particle Trajectories in Long Wave Models
(Doctoral thesis, 2024-04-05)Atferden og mønstrene til partikkelbaner i bølgebevegelser i grunt vann har blitt studert av forskere i flere tiår, spesielt har egenskapene til strømmer under overflatebølger i grunt vann blitt studert ved bruk av matematiske ... -
Passer og linjal, origami og Galoisteori
(Master thesis, 2011-06-01)Denne oppgaven prøver å belyse konstruksjoner med passer og linjal og origami ved hjelp av Galois- teori. De tre klassiske problemene: Kubens fordobling, sirkelens kvadratur og vinkelens tredeling er sentrale. Oppgaven er ... -
Pattern formation in a 2-population homogenized neuronal network model
(Journal article; Peer reviewed, 2021)We study pattern formation in a 2-population homogenized neural field model of the Hopfield type in one spatial dimension with periodic microstructure. The connectivity functions are periodically modulated in both the ... -
PDE Based Algorithms for Smooth Watersheds
(Peer reviewed; Journal article, 2016-04)Watershed segmentation is useful for a number of image segmentation problems with a wide range of practical applications. Traditionally, the tracking of the immersion front is done by applying a fast sorting algorithm. In ... -
Perfusion estimation using synthetic MRI-based measurements and a porous media flow model
(Journal article; Peer reviewed, 2023)The measurement of perfusion and filtration of blood in biological tissue give rise to important clinical parameters used in diagnosis, follow-up, and therapy. In this paper, we address techniques for perfusion analysis ... -
Permeability estimation with the Augmented Lagrangian method for a nonlinear diffusion equation.
(Department of Applied Mathematics report, Research report, 2001-01) -
Persistent Homology via Quotient Spaces
(Master thesis, 2017-12-20)A point cloud can be endowed with a topological structure by constructing a simplicial complex using the points as vertices. Instead of assigning a single simplicial complex, Topological Data Analysis (TDA) employs multiple ... -
Perturbation about neutral solutions occurring in shear flows in stratified, incompressible and inviscid fluids.
(Department of Applied Mathematics report, Research report, 1973-06) -
Phase field modeling of precipitation and dissolution processes in porous media: Upscaling and numerical experiments
(Journal article; Peer reviewed, 2020)We consider a model for precipitation and dissolution in a porous medium, where ions transported by a fluid through the pores can precipitate at the pore walls and form mineral. Also, the mineral can dissolve and become ... -
Physical activity level at work and risk of chronic low back pain: A follow-up in the Nord-Trøndelag Health Study
(Peer reviewed; Journal article, 2017-04-10)Background: Physical activity in leisure time seems to reduce the risk of low back pain, but it is not known whether occupational activity, as recorded in a representative working population, produces a higher or lower ... -
Polarizations of powers of graded maximal ideals
(Journal article; Peer reviewed, 2022)We give a complete combinatorial characterization of all possible polarizations of powers of the graded maximal ideal (x1, x2, . . . , xm) n of a polynomial ring in m variables. We also give a combinatorial description of ... -
Polish Translation and Validation of the Tinnitus Handicap Inventory and the Tinnitus Functional Index
(Peer reviewed; Journal article, 2016-11-29)Objective: The need for validated measures enabling clinicians to classify tinnitus patients according to the severity of tinnitus and screen the progress of therapies in our country led us to translate into Polish and to ... -
Polynomials homologically supported on determinantal loci
(Department of Pure Mathematics report no. 61, Research report, 1991-10) -
A pore network model for calculation of interfacial velocities
(Peer reviewed; Journal article, 2003)Two-phase flow in porous media is characterized by fluid-fluid interfaces that separate the fluid phases at the pore scale. These interfaces support pressure differences between phases, and their dynamics allow for saturation ... -
A pore-scale model for permeable biofilm: Numerical simulations and laboratory experiments
(Peer reviewed; Journal article, 2019)In this paper, we derive a pore-scale model for permeable biofilm formation in a two-dimensional pore. The pore is divided into two phases: water and biofilm. The biofilm is assumed to consist of four components: water, ... -
PorePy: an open-source software for simulation of multiphysics processes in fractured porous media
(Journal article; Peer reviewed, 2021)Development of models and dedicated numerical methods for dynamics in fractured rocks is an active research field, with research moving towards increasingly advanced process couplings and complex fracture networks. The ... -
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 ...