Browsing Institutt for matematiske fag by Title
Now showing items 1547-1566 of 2364
-
One-sided Hölder regularity of global weak solutions of negative order dispersive equations
(Peer reviewed; Journal article, 2023)We prove global existence, uniqueness and stability of entropy solutions with initial data for a general family of negative order dispersive equations. These weak solutions are found to satisfy one-sided Hölder conditions ... -
A one-step Bayesian inversion framework for 3D reservoir characterization based on a Gaussian mixture model-A Norwegian Sea demonstration
(Peer reviewed; Journal article, 2021)We have developed a one-step approach for Bayesian prediction and uncertainty quantification of lithology/fluid classes, petrophysical properties, and elastic attributes conditional on prestack 3D seismic amplitude-varia ... -
Online interactive face-to-face learning in mathematics in engineering education
(Peer reviewed; Journal article, 2022)Online teaching has come to play an increasingly important role in higher education, especially during the Covid-19 pandemic. Being unable to be on campus with face-to-face teaching can be challenging. This article provides ... -
Online Learning in Vowpal Wabbit
(Master thesis, 2015)Online learning methods for sequentially arriving data are growing in popularity. Alternative batch learning methods scale poorly and have memory constraints. The scope of this thesis is to study online learning methods ... -
An operadic approach to substitution in Lie-Butcher series
(Peer reviewed; Journal article, 2022)The paper follows an operadic approach to provide a bialgebraic description of substitution for Lie–Butcher series. We first show how the well-known bialgebraic description for substitution in Butcher’s B-series can be ... -
∞-Operads as Analytic Monads
(Peer reviewed; Journal article, 2022) -
∞-operads as symmetric monoidal ∞-categories
(Journal article; Peer reviewed, 2024) -
∞ -Operads via symmetric sequences
(Peer reviewed; Journal article, 2021)We construct a generalization of the Day convolution tensor product of presheaves that works for certain double \infty -categories. Using this construction, we obtain an \infty -categorical version of the well-known ... -
Operator algebras on Wiener amalgam spaces
(Master thesis, 2022)I denne oppgåva vert operatoralgebraar på Wiener-amalgamrom introdusert og behandla. Først kjem ei grundig innføring til Wiener-amalgamrom på lokalt kompakte grupper, som dreg nytte av både den kontinuerlege og diskrete ... -
Operator splitting for the Benjamin-Ono equation
(Journal article; Peer reviewed, 2015)In this paper we analyze operator splitting for the Benjamin–Ono equation, ut=uux+Huxx, where H denotes the Hilbert transform. If the initial data are sufficiently regular, we show the convergence of both Godunov and Strang ... -
Operator theory in spaces of Dirichlet series
(Doctoral theses at NTNU;2017:193, Doctoral thesis, 2017) -
Opportunities for language enhancement in a learning environment designed on the basis of the theory of didactical situations
(Peer reviewed; Journal article, 2020)This paper is based on data from two teaching sequences in primary school that are designed using principles from the theory of didactical situations (TDS). The following research question is addressed: “What opportunities ... -
Optimal Control of a Semi-Linear Parabolic System Related to Sustainable Marine Fishery
(Master thesis, 2020)Overfiske er et økende problem, og truer mange fiskebestander i verden. In denne masteroppgaven forsøker vi å finne bærekraftige fiskestrategier ved å løse et ikke-konvekst optimalt kontrollproblem. Vi begynner med å ... -
Optimal Control of Multibody Dynamics with Applications
(Master thesis, 2023)Vi presenterer en metode for å representere bjelker ved hjelp av flerkroppsdynamikk, nærmere bestemt et system av stive ledd som kalles en pendelkjede. Ved å innføre ledd i uttrykket som straffer vinkler mellom påfølgende ... -
Optimal control of multiphase steel production
(Journal article; Peer reviewed, 2019)An optimal control problem for the production of multiphase steel is investigated that takes into account phase transformations in the steel slab. The state equations are a semilinear heat equation coupled with an ordinary ... -
Optimal non-linear solvers - Applications in reservoir simulation
(Master thesis, 2014)This thesis starts by giving a general introduction to hydrocarbon reservoirs, before physical relations and mathematical tools used to model the flow of the fluid components in the porous media are presented. The resulting ... -
Optimal Quadrature for univariate and tensor product splines
(Journal article; Peer reviewed, 2016)Numerical integration is a core subroutine in many engineering applications, including the finite element method (FEM). Isogeometric analysis is a FEM technology that uses smooth B-spline and NURBS basis functions. ... -
Optimal recovery of a radiating source with multiple frequencies along one line
(Peer reviewed; Journal article, 2020)We study an inverse problem where an unknown radiating source is observed with collimated detectors along a single line and the medium has a known attenuation. The research is motivated by applications in SPECT and beam ... -
Optimal reparametrization of curves in shape analysis by introducing a deep neural network architecture
(Master thesis, 2021)Former er typisk beskrecet som det som er igjen av et objekt uten å ta hensyn til plassering, rotasjon og størrelse. En stor del av formanalyse består av å definere likheter og forskjeller mellom formene for å utføre ulike ... -
Optimal shapes for tree roots
(Journal article, 2022)The paper studies a class of variational problems, modeling optimal shapes for tree roots. Given a measure μ describing the distribution of root hair cells, we seek to maximize a harvest functional H , computing the ...