Blar i Institutt for matematiske fag på tittel
Viser treff 2428-2447 av 2526
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Understanding module categories through triangulated categories using Auslander-Reiten theory
(Doctoral thesis at NTNU;2016:223, Doctoral thesis, 2016) -
Understanding the Population Structure Correction Regression
(Peer reviewed; Journal article, 2022) -
Ungulate population monitoring in an open tundra landscape:distance sampling versus total counts
(Journal article; Peer reviewed, 2017)Researchers and wildlife managers strive for low bias and high precision (i.e. high accuracy) when estimating animal population sizes. Distance sampling is currently one of the most widely used monitoring methods. However, ... -
Uniform tail estimates and Lp(RN)-convergence for finite-difference approximations of nonlinear diffusion equations
(Journal article; Peer reviewed, 2022) -
Uniformt fordelte følger og diskrepans
(Bachelor thesis, 2022) -
Unique factorization in Dedekind domains
(Master thesis, 2016)In this thesis we study ideals in Dedekind domains, which factorize uniquely into a product of prime ideals. As not every Dedekind domain is a unique factorization domain, a general element in these domains does not ... -
Unique Factorization of Ideals
(Master thesis, 2013)We study Dedekind domains, where ideals factorize uniquely into a product ofprime ideals. This subject is of interest as general elements in these rings donot necessarily factorize uniquely. -
Uniqueness and properties of distributional solutions of nonlocal equations of porous medium type
(Journal article; Peer reviewed, 2017)We study the uniqueness, existence, and properties of bounded distributional solutions of the initial value problem for the anomalous diffusion equation ∂tu−Lμ[φ(u)]=0. Here Lμ can be any nonlocal symmetric degenerate ... -
Uniqueness of conservative solutions for the Hunter–Saxton equation
(Peer reviewed; Journal article, 2022)We show that the Hunter–Saxton equation ut+uux=14(∫x−∞dμ(t,z)−∫∞xdμ(t,z)) and μt+(uμ)x=0 has a unique, global, weak, and conservative solution (u,μ) of the Cauchy problem on the line. -
Uniqueness of dissipative solutions for the Camassa-Holm equation
(Peer reviewed; Journal article, 2024)We show that the Cauchy problem for the Camassa–Holm equation has a unique, global, weak, and dissipative solution for any initial data u0 ∈H1(R), such that u0,x is bounded from above almost everywhere. In particular, we ... -
Universal Zero Dynamics: The SISO Case
(Chapter, 2021)Given a single-input, single-output (SISO) system with a Chen-Fliess series representation whose generating series has a well defined relative degree, it is shown that there is a notion of universal zero dynamics that ... -
Universality and distribution of zeros and poles of some zeta functions
(Peer reviewed; Journal article, 2020)This paper studies zeta functions of the form P∞ n=1 χ(n)n −s , with χ a completely multiplicative function taking only unimodular values. We denote by σ(χ) the infimum of those α such that the Dirichlet series P∞ n=1 χ(n)n ... -
University students’ learning approaches: An adaptation of the revised two-factor study process questionnaire to Norwegian
(Journal article; Peer reviewed, 2019)This paper reports a Norwegian validation study of a widely used instrument to measure students’ approaches to learning, namely, Bigg’s revised two-factor study process questionnaire (R-SPQ-2F). Its cultural sensitivity ... -
Unstable splittings in Hodge filtered Brown-Peterson cohomology
(Journal article, 2018)We construct Hodge filtered function spaces associated to infinite loop spaces. For Brown–Peterson cohomology, we show that the corresponding Hodge filtered spaces satisfy an analog of Wilson’s unstable splitting. As a ... -
Unstructured PEBI-grids Adapting to Geological Features in Subsurface Reservoirs
(Master thesis, 2016)Extensive research has been done on the generation of unstructured grids in reservoir simulation, with the aim of better representing the geology. We introduce UPR (Unstructured PEBI-grids for Reservoirs), a free, open ... -
Unstructured Voronoi grids conforming to lower-dimensional objects
(Journal article; Peer reviewed, 2018)We present a novel mixed-dimensional method for generating unstructured polyhedral grids that conform to prescribed geometric objects in arbitrary dimensions. Two types of conformity are introduced: (i) control-point ... -
Upscaling models of CO2 migration through low-permeable layers in porous media
(Master thesis, 2020)In this thesis we investigate methods preserving the effects of thin layers of rock with low permeability on flow behaviour while upscaling geological models of porous media. More specifically, we study this upscaling in ... -
Upscaling of Water-Flooding Scenarios and Modeling of Polymer Flow
(Doctoral thesis at NTNU;2016:12, Doctoral thesis, 2016)This thesis considers simulations of the fluid flow in petroleum reservoirs, and includes work on upscaling methods and on modeling of polymer flood- ing, which is a particular method of enhanced oil recovery. The details ... -
Use of dynamically adapted basis functions to accelerate multiscale simulation of complex geomodels
(Chapter, 2018)A number of different multiscale methods have been developed as a robust alternative to upscaling and as a means for accelerated reservoir simulation of high-resolution geomodels. In their basic setup, multiscale methods ... -
Using an autonomous underwater vehicle with onboard stochastic advection-diffusion models to map excursion sets of environmental variables
(Peer reviewed; Journal article, 2021)New robotic sensor platforms have computing resources that enable a rich set of tasks for adaptive monitoring of the environment. But to substantially augment the toolbox of environmental sensing, such platforms must be ...