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Now showing items 301-400 of 3764
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Let X, Y be two irreducible subvarieties of the projective space Pn, and d≥1 an integer number. The main result of this paper is an algorithm to construct explicitly, in terms of d and the ideals defining X and Y, a ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Statistical fraud detection consists in making a system that automatically selects a subset of all cases (insurance claims, financial transactions, etc.) that are the most interesting for further investigation. The reason ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We study the charging dynamics of a long electrolyte-filled slit pore in response to a suddenly applied potential. In particular, we analytically solve the Poisson–Nernst–Planck (PNP) equations for a pore for which λD≪H≪L, ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Prenatal maternal anxiety has been associated with both short and long-term mental health problems in the child. The current study aims to examine the association between maternal and paternal prenatal anxiety and behaviour ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
We propose a family of lagged random walk sampling methods in simple undirected graphs, where transition to the next state (i.e., node) depends on both the current and previous states—hence, lagged. The existing random ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Every multipartite entangled quantum state becomes fully separable after an entanglement breaking quantum channel acted locally on each of its subsystems. Whether there are other quantum channels with this property has ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
Automated Valuation Models are statistical models used by banks and other financial institutions to estimate the price of a dwelling, typically motivated by financial risk management purposes. The preferred choice of model ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
We determine the maximum order of an element in the critical group of a strongly regular graph, and show that it achieves the spectral bound due to Lorenzini. We extend the result to all graphs with exactly two nonzero ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
On January 18, 2022, around 1 million kilometers from Earth, five times the distance from Earth to the Moon, a large asteroid passed without harm to the Earth. Theoretically, however, the event of the asteroid falling into ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Extreme floods cause casualties and widespread damage to property and vital civil infrastructure. Predictions of extreme floods, within gauged and ungauged catchments, is crucial to mitigate these disasters. In this paper ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We analyse how carbon emissions are reduced utilizing the new NordLink cable between Norway and Germany, taking policy plans of platform electrification in Norway into account. Building a stochastic model based on existing ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Generative machine learning (ML) has been postulated to become a major driver in the computational design of antigen-specific monoclonal antibodies (mAb). However, efforts to confirm this hypothesis have been hindered by ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Abstract We consider the problem of recommending relevant content to users of an internet platform in the form of lists of items, called slates. We introduce a variational Bayesian Recurrent Neural Net recommender system ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Abstract We study the spreading of droplets in a near-critical phase-separated liquid mixture, using a combination of experiments, lubrication theory and finite-element numerical simulations. The classical Tanner’s law ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We review theoretical and numerical models of the glymphatic system, which circulates cerebrospinal fluid and interstitial fluid around the brain, facilitating solute transport. Models enable hypothesis development and ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Probabilistic modelling and statistical analysis of environmental conditions is important for the design and assessment of ships and other marine structures. It will give a necessary input to structural reliability assessments ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
In a previous work, we gave a construction of (not necessarily realisable) oriented matroids from a triangulation of a product of two simplices. In this follow-up paper, we use a combinatorial analogue of Viro's patchworking ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Free wave generation due to a ship or storm moving past a shallow, great depth change of the water, is measured on the shore (coast), modeled and compared. The free waves are generated at the depth change where the forced ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We developed a novel, pump-less directional flow recirculating organ-on-a-chip (rOoC) platform that creates controlled unidirectional gravity-driven flow by a combination of a 3D-tilting system and an optimized microfluidic ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We apply the specialization technique based on the decomposition of the diagonal to the intersection of a quadric and cubic hypersurface in P6. We find an explicit example defined over Q that is smooth, and does not admit ...
(Master thesis / Masteroppgave, 2022)
Målet med denne oppgaven er å utforske og kategorisere et utvalg av ringer fra ringspillet. Ringspillet er et upartisk kombinatorisk spill. I det første kapittelet, vil vi gå gjennom litt grunnleggende teori om ringer. I ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Reliable probabilistic information of the long-term ocean wave climate is important in many coastal and ocean engineering applications such as the design of marine and coastal structures. There is therefore a need to ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
In this article, the notion of a mathematical model in science is attempted to be enlightened from several points of view. It is shown that mathematical models are introduced differently and used differently in different ...
Finding Money Launderers Using Heterogeneous Graph Neural Networks Restricted Access
(Master thesis / Masteroppgave, 2022)
Money laundering is the activity of securing proceeds from criminal acts by concealing their origins. It is a vast global problem, as it is essential for all types of crime where the goal is to make profit. Anti money ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
In this article, a novel weakly supervised machine learning approach is proposed for intelligent predictive maintenance (IPdM). It employs balanced random forest and multiple instance learning based on event logs from ...
(Master thesis / Masteroppgave, 2022)
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
Understanding how electrolyte-filled porous electrodes respond to an applied potential is important to many electrochemical technologies. Here, we consider a model supercapacitor of two blocking cylindrical pores on either ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
Maritime Autonomous Surface Ships (MASSs) will reshape the fast-evolving ecosystem for their attractive socio-economic benefits and potential to improve safety. However, their new systems and technology need thorough ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
Environmental contours are widely used as basis for design of structures exposed to environmental loads. The basic idea of the method is to decouple the environmental description from the structural response. This is done ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
Motivated by the problem of characterizing KMS states on the reduced C∗-algebras of étale groupoids, we show that the reduced norm on these algebras induces a C∗-norm on the group algebras of the isotropy groups. This ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
Energy system models underpin decisions by energy system planners and operators. Energy system modeling faces a transformation: accounting for changing meteorological conditions imposed by climate change. To enable that ...
(Master thesis / Masteroppgave, 2022)
The aim of this thesis is to study some of the symmetries of a projective plane curve by describing the fixed points of the subgroups of the alternating group A_5. The group A_5, is the rotational symmetry group of the ...
(Master thesis / Masteroppgave, 2022)
The amount of data and the performance of machine learning algorithms have increased dramatically as technology has advanced over the last few decades. Also in the field of toxicology, large amounts of data have been ...
(Chapter / Bokkapittel / AcceptedVersion; Peer reviewed, 2022)
We study a first-order theory of finite full binary trees with an axiom schema of open induction. We show that this theory is sequential by constructing a direct interpretation of Adjunctive Set Theory in a very weak ...
(Chapter / Bokkapittel / AcceptedVersion; Peer reviewed, 2022)
We introduce a first-order theory of finite full binary trees and show that the analogue of Hilbert’s Tenth Problem is undecidable by constructing a many-to-one reduction of Post’s Correspondence Problem.
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
Stochastic model for malaria transmission is introduced, and its behavior under insecticide-treated nets (which is used as a prevention) is considered. A white noise is introduced into the model, representing fluctuations ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
The purpose of this paper is to discuss a generalization of the bubble transform to differential forms. The bubble transform was discussed in Falk and Winther (Found Comput Math 16(1):297–328, 2016) for scalar valued ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
We consider nonlinear scalar conservation laws posed on a network. We define an entropy condition for scalar conservation laws on networks and establish $L^1$ stability, and thus uniqueness, for weak solutions satisfying ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
Thomason’s étale descent theorem for Bott periodic algebraic K–theory is generalized to any MGL module over a regular Noetherian scheme of finite dimension. Over arbitrary Noetherian schemes of finite dimension, this ...
(Master thesis / Masteroppgave, 2022)
This master thesis studies the statistical properties of waves generated at the Hydrodynamics Laboratory of the Department of Mathematics at the University of Oslo. We look at two distinct experimental setups. First, we ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
In this paper we propose a boosting algorithm to extend the applicability of a first hitting time model to high-dimensional frameworks. Based on an underlying stochastic process, first hitting time models do not require ...
(Doctoral thesis / Doktoravhandling, 2022)
To a mathematician, a surface is a shape that, upon close enough inspection, looks like a flat piece of paper around each of its points. Thus, to an ant, the surface of a bagel is conceived as flat, while the (roughly) ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Male sex and advanced age are associated with severe symptoms of COVID-19. Sex and age also exhibit substantial associations with genome-wide DNA methylation (DNAm) differences in humans. Using a random sample of Illumina ...
(Doctoral thesis / Doktoravhandling, 2022)
Quantum groups first arose out of the study of integrability in quantum mechanics, presenting a new notion of symmetry extending beyond the traditional group concept. Quantum groups can be thought of as the collection of ...
(Master thesis / Masteroppgave, 2022)
Fluid flow in helically coiled pipes is not fully understood. Although many efforts have been devoted to investigating the complex characteristics of the flow in helically coiled pipes, much is unknown for especially high ...
(Master thesis / Masteroppgave, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We complete the proof of a theorem we announced and partly proved in [Math. Nachr., vol. 271 (2004), Thm. 2.5, p. 74]. The theorem concerns a family of curves on a family of surfaces. It has two parts. The first was proved ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
Increased knowledge about energy dissipation processes around colliding ice floes is important for improved understanding of atmosphere-ice-ocean energy transfer, wave propagation through sea ice, and the polar climates. ...
(Master thesis / Masteroppgave, 2022)
Denne oppgaven har som mål å drøfte hvordan selvsimilaritet kan benyttes som et redskap i framstillingen og studiet av kurver med «patologiske» egenskaper, i all hovedsak fraktaler og flatefyllende kurver. For å kunne ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
This document is a short user’s guide to the theory of motives and homotopy theory in the setting of logarithmic geometry. We review some of the basic ideas and results in relation to other works on motives with modulus, ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
In the process of converting food-processing by-products to value-addedingredients, fine grained control of the rawmaterials, enzymes and process conditionsensures the best possible yield and eco-nomic return. However, ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Bias from weak instruments may undermine the ability to estimate causal effects in instrumental variable regression (IVR). We present here a new approach to handling weak instrument bias through the application of a new ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The presence of snow and ice on runway surfaces reduces the available tire-pavement friction needed for retardation and directional control and causes potential economic and safety threats for the aviation industry during ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Abstract We develop a theory of finite element systems, for the purpose of discretizing sections of vector bundles, in particular those arising in the theory of elasticity. In the presence of curvature, we prove a discrete ...
Diffusions in Euclidean spaces and on manifolds. Restricted Access
(Master thesis / Masteroppgave, 2022)
(Master thesis / Masteroppgave, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We investigate the regularizing effect of certain additive continuous perturbations on SDEs with multiplicative fractional Brownian motion (fBm). Traditionally, a Lipschitz requirement on the drift and diffusion coefficients ...
(Chapter / Bokkapittel / PublishedVersion; Peer reviewed, 2022)
Battery systems are increasingly being used for powering ocean going ships, and the number of fully electric or hybrid ships relying on battery power for propulsion and manoeuvring is growing. In order to ensure the safety ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Objectives This study examined the association between night shift work and risk of breast cancer, overall and by hormone receptor subtype, among females in the Norwegian Offshore Petroleum Workers (NOPW) cohort. We also ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Abstract We discuss proofs of local cohomology theorems for topological modular forms, based on Mahowald–Rezk duality and on Gorenstein duality, and then make the associated local cohomology spectral sequences explicit, ...
(Master thesis / Masteroppgave, 2022)
Elliptic curves are used in post-quantum cryptography, where two parties can use compositions of low-degree isogenies to establish a shared secret. There are several forms for representing elliptic curves, and different ...
(Chapter / Bokkapittel / PublishedVersion; Peer reviewed, 2022)
We propose a novel semi-supervised learning method to monitor the State of Health of lithium-ion batteries, a prominent technology for the electrification of the transport sector. Our approach enables State of Health ...
A modified dividing local Gaussian processes algorithm for theoretical particle physics applications
(Chapter / Bokkapittel / PublishedVersion; Peer reviewed, 2022)
We explore the use of dividing local Gaussian processes in the context of theoretical particle physics. We adapt an existing algorithm to the specific problem, trading some speed for a better precision. An intensive ...
(Master thesis / Masteroppgave, 2022)
The aim of this thesis is to investigate the diagonals of doubly stochastic matrices. More specifically, we have studied doubly stochastic matrices with constant diagonal sums, and how small modifications made to these ...
(Master thesis / Masteroppgave, 2022)
Normal pressure hydrocephalus is a variant of reversible dementia. The symptoms manifest themselves in the form of urinary incontinence, gait disturbance and dementia, and it is estimated that at least 22 out of 100 000 ...
(Master thesis / Masteroppgave, 2022)
(Master thesis / Masteroppgave, 2022)
The theory of multi-view geometry concerns the reconstruction of a landscape from multiple images. We will analyze the reconstruction of \(\P^2\) from \(n\) images, for \(n=2,3,4\). A reconstruction of \(\P^2\) consists ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Abstract The prognosis of cutaneous melanoma depends on early detection, and good biomarkers for melanoma risk may provide a valuable tool to detect melanoma development at a pre-clinical stage. By studying the epigenetic ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
(Doctoral thesis / Doktoravhandling, 2022)
Traffic volumes are increasing in most of the major modes of transportation. As population centers grow in size and density, the increasing demand for public transit and delivery services leads to increased rail and road ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
In the book Helland (2021) the general problem of reconstructing the Hilbert space formulation in quantum theory is discussed from the point of view of what I called conceptual variables, any variables defined by a person ...
(Doctoral thesis / Doktoravhandling, 2022)
Hyperbolic conservation laws are used to model various important applications such as gas flow or traffic flow. Those phenomena are interesting to study in a one-dimensional setting, it would be even more relevant for real ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Objective
To investigate the association between smoking and infertility.
Design
Prospective study.
Setting
Nationwide cohort.
Patients
28,606 women and 27,096 men with questionnaire and genotype information ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
This paper provides sufficient density conditions for the existence of smooth vectors generating a frame or Riesz sequence in the lattice orbit of a square-integrable projective representation of a nilpotent Lie group. The ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The well known Bell experiment with two actors Alice and Bob is considered. First the simple deduction leading to the CHSH inequality under local realism is reviewed, and some arguments from the literature are recapitulated. ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
In the language {0,1,∘,⪯}, where 0 and 1 are constant symbols, ∘ is a binary function symbol and ⪯ is a binary relation symbol, we formulate two theories, WD and D, that are mutually interpretable with the theory of ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Many banks and credit institutions are required to assess the value of dwellings in their mortgage portfolio. This valuation often relies on an Automated Valuation Model (AVM). Moreover, these institutions often report the ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The bottleneck matrix M of a rooted tree T is a combinatorial object encoding the spatial distribution of the vertices with respect to the root. The spectral radius of M, known as the Perron value of the rooted tree, is ...
(Master thesis / Masteroppgave, 2022)
In-situ measurement data of ocean waves is important for the validation and tuning of several types of numerical models. A recent inexpensive alternative to the widely used buoy measurements is given by a wave sensor system ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Administrative data may suffer from delays or mistakes in reporting. To adjust for the resulting measurement errors, it is often necessary to combine data from related sources, such as sample survey, administrative or ‘big’ ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We prove Lieb type convexity and concavity results for trace functionals associated with positive operator monotone (decreasing) functions and certain monotone concave functions, together with strictly positive linear maps ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
Lutefisk is a traditional Norwegian Christmas dish, made of dry cod soaked in a lye solution before re-hydrated. We report measurements of tissue rheological properties of cooked Lutefisk. Surprisingly, we find that the ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
The purpose of this paper is to investigate properties of self-exciting jump processes where the intensity is given by an SDE, which is driven by a finite variation stochastic jump process. The value of the intensity process ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
This note provides new criteria on a unimodular group G and a discrete series representation (π,Hπ) of formal degree dπ>0 under which any lattice Γ≤G with vol(G/Γ)dπ≤1 (resp. vol(G/Γ)dπ≥1) admits g∈Hπ such that π(Γ)g is a ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
We provide a detailed analysis of the Gelfand integral on Fréchet spaces, showing among other things a Vitali theorem, dominated convergence and a Fubini result. Furthermore, the Gelfand integral commutes with linear ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We prove convergence rates of monotone schemes for conservation laws for Hölder continuous initial data with unbounded total variation, provided that the Hölder exponent of the initial data is greater than 12/. For strictly ...
(Master thesis / Masteroppgave, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
We consider converses to the density theorem for square-integrable, irreducible, projective, unitary group representations restricted to lattices using the dimension theory of Hilbert modules over twisted group von Neumann ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Longevity and safety of lithium-ion batteries are facilitated by efficient monitoring and adjustment of the battery operating conditions. Hence, it is crucial to implement fast and accurate algorithms for State of Health ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)