## Search

Now showing items 1-100 of 874

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

For X a smooth quasi-projective variety and 𝑋[𝑛] its associated Hilbert scheme of n points, we study two canonical Fourier–Mukai transforms 𝖣(𝑋)→𝖣(𝑋[𝑛]), the one along the structure sheaf and the one along the ideal ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

We argue that there is a link between implicit computational complexity theory and reversible computation. We introduce inherently reversible programming languages which capture the complexity classes etime and Image 1. ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

Background
Sleep is important for healthy functioning in children. Numerous genetic and environmental factors, from conception onwards, may influence this phenotype. Epigenetic mechanisms such as DNA ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

Background
Little is known about the association between bacterial DNA in human blood and the risk of cardiovascular disease (CVD) mortality.
Methods
...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

This study suggests a stochastic model for time series of daily zonal (circumpolar) mean stratospheric temperature at a given pressure level. It can be seen as an extension of previous studies which have developed stochastic ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewedPeer reviewed, 2022)

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

Capillaries are the smallest vessels in the body which are responsible for delivering oxygen and nutrients to surrounding cells. Various life-threatening diseases are known to alter the density of healthy capillaries and ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

Gravitational settling of a droplet in air onto a soft substrate is a ubiquitous event relevant to many natural processes and engineering applications. We study this phenomenon by developing a three-phase lubrication model ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

For an infinity of number rings we express stable motivic invariants in terms of topological data determined by the complex numbers, the real numbers and finite fields. We use this to extend Morel’s identification of the ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

We present a numerical scheme for the solution of nonlinear mixed-dimensional PDEs describing coupled processes in embedded tubular network system in exchange with a bulk domain. Such problems arise in various biological ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

We present a novel numerical technique for computational models of thin tubular networks embedded in a bulk domain, for example a porous medium. These systems occur in the simulation of fluid flow in vascularized biological ...

(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 / 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 ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

Abstract
Copulas are appealing tools in multivariate probability theory and statistics. Nevertheless, the transfer of this concept to infinite dimensions entails some nontrivial topological and functional analytic ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

This article generalises the concept of realised covariation to Hilbert-space-valued stochastic processes. More precisely, based on high-frequency functional data, we construct an estimator of the trace-class operator-valued ...

(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 ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)

We propose Fit4CAD, a benchmark for the evaluation and comparison of methods for fitting simple geometric primitives in point clouds representing CAD objects. This benchmark is meant to help both method developers and those ...

(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 ...

(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 ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

There is a wide consensus within the polar science, meteorology, and oceanography communities that more in situ observations of the ocean, atmosphere, and sea ice are required to further improve operational forecasting ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

Abstract Assisted reproductive technology (ART) may affect fetal development through epigenetic mechanisms as the timing of ART procedures coincides with the extensive epigenetic remodeling occurring between fertilization ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)

We extend the recently developed rough path theory for Volterra equations from [12] to the case of more rough noise and/or more singular Volterra kernels. It was already observed in [12] that the Volterra rough path ...

(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 ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

(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 / 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 / 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, ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

We study distribution dependent stochastic differential equation driven by a continuous process, without any specification on its law, following the approach initiated in [17]. We provide several criteria for existence and ...

(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)

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 / 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 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 ...

(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)

We consider the charging of a model capacitor comprised of two planar electrodes and an electrolyte. Upon switching on a voltage difference, electric double layers build up in this setup, which we characterize with 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)

We investigate stochastic Volterra equations and their limiting laws. The stochastic Volterra equations we consider are driven by a Hilbert space valued Lévy noise and integration kernels may have non-linear dependence on ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

In this paper, we address the problem of constructing C2 cubic spline functions on a given arbitrary triangulation T. To this end, we endow every triangle of T with a Wang–Shi macro-structure. The C2 cubic space on such a ...

(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 ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)

When major disruptions occur in a rail network, the infrastructure manager and train operating companies may be forced to stop trains until the normal status is recovered. A crucial aspect is to identify, for each train, ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

Abstract We prove the crepant resolution conjecture for Donaldson–Thomas invariants of hard Lefschetz 3-Calabi–Yau (CY3) orbifolds, formulated by Bryan–Cadman–Young, interpreting the statement as an equality of rational ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)

(Journal article / Tidsskriftartikkel / 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 ...

(Journal article / Tidsskriftartikkel / 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)

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 ...

(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 ...

(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)

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

This paper deals with the specification of probability distributions expressing ignorance concerning annual or otherwise discretized failure or mortality rates, when these rates can safely be assumed to be increasing and ...

(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 / AcceptedVersion; Peer reviewed, 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)

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)

Abstract Understanding the droplet cloud and spray dynamics is important for the study of the ocean surface and marine boundary layer. The role that the wave energy and the type of wave breaking play in the resulting ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)

(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 / 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)

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)

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 / 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 / AcceptedVersion; Peer reviewed, 2022)

(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. ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)

This paper considers data-based real-time adaptive Fault Detection (FD) in Grid-connected PV (GPV) systems under Power Point Tracking (PPT) modes during large variations. Faults under PPT modes remain undetected for longer ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)

With the introduction of the exchange-traded German wind power futures, opportunities for German wind power producers to hedge their volumetric risk are present. We propose two continuous-time multivariate models for wind ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)

Recently, Brannan and Vergnioux showed that the orthogonal free quantum group factors [Formula: see text] have Jung’s strong [Formula: see text]-boundedness property, and hence are not isomorphic to free group factors. We ...

(Journal article / Tidsskriftartikkel / SubmittedVersion, 2021)

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

Cardiac muscle cells can exhibit complex patterns including irregular behaviour such as chaos or (chaotic) early afterdepolarisations (EADs), which can lead to sudden cardiac death. Suitable mathematical models and their ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)

The steric repulsion between proteins on biological membranes is one of the most generic mechanisms that cause membrane shape changes. We present a minimal model in which a spontaneous curvature is induced by asymmetric ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

Background
Gestational age is a useful proxy for assessing developmental maturity, but correct estimation of gestational age is difficult using clinical measures. DNA methylation at birth has proven to be ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

This study presents wave measurements in the Marginal Ice Zone (MIZ) obtained from ship mounted sensors. The system combines altimeter readings from the ship bow with ship motion correction data to provide estimated single ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

Many of the widely used models for description of nonlinear surface gravity waves, in deep or shallow water, such as High Order Spectral Method (HOSM) and Boussinesq-type equations, rely on the elimination of the vertical ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

A sharp version of a recent inequality of Kovalev and Yang on the ratio of the (H1)∗ and H4 norms for certain polynomials is obtained. The inequality is applied to establish a sharp and tractable sufficient condition for ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)

Deep Reinforcement Learning (DRL) has recently spread into a range of domains within physics and engineering, with multiple remarkable achievements. Still, much remains to be explored before the capabilities of these methods ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

Background
Studies of mammalian CSF dynamics have been focused on three things: paravascular flow, pressure and pulsatility, and “bulk” flow; and three (respective) potential motive forces have been ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

We study the stability of a unique weak solution to certain parabolic systems with nonstandard growth condition, which are additionally dependent on a cross-diffusion term. More precisely, we show that two unique weak ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

Structural reliability analysis is concerned with estimation of the probability of a critical event taking place, described by P(g(X)≤0) for some n-dimensional random variable X and some real-valued function g. In many ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

Graph products of groups were introduced by Green in her thesis [32]. They have an operator algebraic counterpart introduced and explored in [14]. In this paper we prove Khintchine type inequalities for general C⁎-algebraic ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

Coupled partial differential equations (PDEs) defined on domains with different dimensionality are usually called mixed-dimensional PDEs. We address mixed-dimensional PDEs on three-dimensional (3D) and one-dimensional (1D) ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

We investigate the probabilistic and analytic properties of Volterra processes constructed as pathwise integrals of deterministic kernels with respect to the Hölder continuous trajectories of Hilbert-valued Gaussian ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

Operating in energy and commodity markets require a management of risk using derivative products such as forward and futures, as well as options on these. Many of the popular stochastic models for spot dynamics and weather ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

System logs or log files containing textual messages with associated time stamps are generated by many technologies and systems. The clustering technique proposed in this paper provides a tool to discover and identify ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)

The present study was originally motivated by some intriguing exact solutions for waves propagating in nonuniform media. In particular, for special depth profiles reflected waves did not appear and ray theory became exact. ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

Plants and insects use slender conical structures to transport and collect small droplets, which are propelled along the conical structures due to capillary action. These droplets can deposit a fluid film during their ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

This work introduces the deconvolution as a technique to reconstruct missing information in data. While the method was originally developed for ocean waves, it will be useful in a wider range of applications where gaps in ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

Two-phase oil and gas flow were simulated in an entirely eccentric annulus and compared with experimental data at horizontal, 4, 10, and 90° inclination. The gas-phase was sulphur hexafluoride and the liquid phase a mixture ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)

In the setting of one-dimensional polynomial jump-diffusion dynamics, we provide an explicit formula for computing correlators, namely, cross-moments of the process at different time points along its path. The formula ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

We introduce a rough perturbation of the Navier–Stokes system and justify its physical relevance from balance of momentum and conservation of circulation in the inviscid limit. We present a framework for a well-posedness ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

Publication bias and p-hacking are two well-known phenomena that strongly affect the scientific literature and cause severe problems in meta-analyses. Due to these phenomena, the assumptions of meta-analyses are seriously ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)

We introduce a mean counting function for Dirichlet series, which plays the same role in the function theory of Hardy spaces of Dirichlet series as the Nevanlinna counting function does in the classical theory. The existence ...

(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)

Experimental and numerical evidence have shown that nonuniform bathymetry may alter significantly the statistical properties of surface elevation in irregular wave fields. The probability of “rogue” waves is increased near ...

(Journal article / Tidsskriftartikkel / SubmittedVersion, 2021)

We analyse forward prices observed at the Fishpool market, and propose a two-factor continuous-time stochastic process for modelling the time dynamics. The data analysis reveals that the two factors can be assumed to be a ...

(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)

Background
The overall aim of this study is to examine the effect of prenatal maternal anxiety on birthweight and gestational age, controlling for shared family confounding using a sibling comparison design.
...