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On complex dynamics in a Purkinje and a ventricular cardiac cell model 
Erhardt, André Henrik; Solem, Susanne (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 ...
Statistical Modelling and Comparison of Model-Based Fatigue Calculations and Hull Monitoring Data for Container Vessels 
Vanem, Erik; Aarsnes, Lars Holterud; Storhaug, Gaute; Astrup, Ole Christian (Chapter / Bokkapittel / AcceptedVersion; Peer reviewed, 2021)
This paper presents the results of statistical analyses on the difference between measured and calculated fatigue rates for an ocean-going container vessel. Data from a hull monitoring system installed on-board this ship ...
Variational Boussinesq model for kinematics calculation of surface gravity waves over bathymetry 
Gramstad, Odin; Trulsen, Karsten (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 ...
Wave measurements from ship mounted sensors in the Arctic marginal ice zone 
Løken, Trygve Kvåle; Rabault, Jean; Jensen, Atle; Sutherland, Graig; Christensen, Kai Håkon; Müller, Malte (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 ...
Quantization of subgroups of the affine group 
Tuset, Lars; Bieliavsky, Pierre; Gayral, Victor; Neshveyev, Sergey (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
108844
Multivariate continuous-time modeling of wind indexes and hedging of wind risk 
Benth, Fred Espen; Sønderby Christensen, Troels; Rohde, Victor (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 ...
DIRECT SHAPE OPTIMIZATION THROUGH DEEP REINFORCEMENT LEARNING 
Viquerat, Jonathan; Rabault, Jean; Kuhnle, Alexander; Ghraieb, Hassan; Larcher, Aurelien; Hachem, Elie (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 ...
Variations in the cerebrospinal fluid dynamics of the American alligator (Alligator mississippiensis) 
Young, Bruce A.; Adams, James; Beary, Jonathan M.; Mardal, Kent-Andre; Schneider, Robert; Kondrashova, Tatyana (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 ...
Scalable change and anomaly detection in cross-correlated data 
Tveten, Martin (Doctoral thesis / Doktoravhandling, 2021)
Both in science and industry, the sizes of data sets are growing. It is not uncommon to encounter sets containing millions or even billions of measurements. Without appropriate tools for turning such enormous amounts of ...
A converse to the Schwarz lemma for planar harmonic maps 
Brevig, Ole Fredrik; Ortega-Cerdà, Joaquim; Seip, Kristian (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 ...
Film deposition and dynamics of a self-propelled wetting droplet on a conical fibre 
Chan, Tak Shing; Pedersen, Christian; Koplik, Joel; Carlson, Andreas (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
We study the dynamic wetting of a self-propelled viscous droplet using the time-dependent lubrication equation on a conical-shaped substrate for different cone radii, cone angles and slip lengths. The droplet velocity is ...
Stability of weak solutions to parabolic problems with nonstandard growth and cross–diffusion 
Erhardt, André Henrik (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 ...
Projecting onto Helson matrices in Schatten classes 
Brevig, Ole Fredrik; Miheisi, Nazar (Journal article / Tidsskriftartikkel / SubmittedVersion, 2021)
Sequential Bayesian optimal experimental design for structural reliability analysis 
Dahl, Kristina Rognlien; Agrell, Christian (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 ...
Pricing of Commodity and Energy Derivatives for Polynomial Processes 
Benth, Fred Espen (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 ...
Graph product Khintchine inequalities and Hecke C∗-algebras: Haagerup inequalities, (non)simplicity, nuclearity and exactness 
Caspers, Martijn; Klisse, Mario; Larsen, Nadia S. (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 ...
Multiplicative Tate Spectral Sequences 
Hedenlund, Alice Petronella (Doctoral thesis / Doktoravhandling, 2021)
Many important results in mathematics deal with the question of figuring out what objects are ‘the same’. One way of rigorously dealing with this is through the notion of isomorphic objects. However, it is sometimes better ...
Film coating by directional droplet spreading on fibers 
Chan, Tak Shing; Lee, Carmen L.; Pedersen, Christian (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 ...
The deconvolution as a method to deal with gaps in ocean wave measurements 
Støle-Hentschel, Susanne; Nieto Borge, Jose Carlos; Trulsen, Karsten (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 ...
Analysis of the risk premium in the forward market for salmon 
Benth, Fred Espen; Eikeset, Anne Maria; Levin, Simon A.; Ren, Wanjuan (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 ...
Simulations of two-phase gas-liquid flow in concentric and eccentric annuli at 0 to 90 degrees inclination using the volume of fluid method 
Friedemann, Christopher (Doctoral thesis / Doktoravhandling, 2021)
In this thesis, two-phase flow in an annular pipe geometry is studied using an open-source software known as OpenFOAM. The data collected through the simulations in this thesis are compared to experimental data collected ...
Fault detection and diagnosis of nonlinear dynamical processes through correlation dimension and fractal analysis based dynamic kernel PCA 
Bounoua, Wahiba; Bakdi, Azzeddine (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
A novel Dynamic Kernel PCA (DKPCA) method is developed for process monitoring in nonlinear dynamical systems. Classical DKPCA approaches still exhibit vague linearity assumptions to determine the number of principal ...
Real-time fault detection in PV systems under MPPT using PMU and high-frequency multi-sensor data through online PCA-KDE-based multivariate KL divergence 
Bakdi, Azzeddine; Bounoua, Wahiba; Guichi, Amar; Mekhilef, Saad (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 ...
Direction and magnitude of cerebrospinal fluid flow vary substantially across central nervous system diseases 
Eide, Per K; Valnes, Lars M; Lindstrøm, Erika K; Mardal, Kent-Andre; Ringstad, Geir (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Background Several central nervous system diseases are associated with disturbed cerebrospinal fluid (CSF) flow patterns and have typically been characterized in vivo by phase-contrast magnetic resonance ...
Two-phase co-current flow simulations using periodic boundary conditions in horizontal, 4, 10 and 90° inclined eccentric annulus, flow prediction using a modified interFoam solver and comparison with experimental results 
Friedemann, Christopher; Mortensen, Mikael; Nossen, Jan (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 ...
Intracranial pressure elevation alters CSF clearance pathways 
Vinje, Vegard; Eklund, Anders; Mardal, Kent-Andre; Rognes, Marie E; Støverud, Karen-Helene (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Background Infusion testing is a common procedure to determine whether shunting will be beneficial in patients with normal pressure hydrocephalus. The method has a well-developed theoretical foundation and ...
Epidemiological, econometric, and decision theoretic applications of statistical inference 
Stoltenberg, Emil Aas (Doctoral thesis / Doktoravhandling, 2020)
This thesis presents new statistical methodology, models, and estimators that are geared towards answering scientific questions in epidemiology and medicine, and in economics and finance. The questions are: (i) What is the ...
Stochastic Modeling with Fractional and non-Fractional Noises: Applications to Finance and Insurance 
Lagunas Merino, Marc (Doctoral thesis / Doktoravhandling, 2020)
In my doctoral work, I have developed stochastic models that use different type of noises, to price financial derivatives and insurance products. Stock prices have a random component in their behavior that characterizes ...
Investigations into real determinantal quartic hypersurfaces 
Helsø, Martin (Doctoral thesis / Doktoravhandling, 2020)
This thesis is a collection of four papers about symmetric and Hermitian determinantal representations of quartic hypersurfaces. - Paper I classifies rational quartic symmetroids in 3-space. - Paper II classifies rational ...
Selection of variables for multivariable models: opportunities and limitations in quantifying model stability by resampling 
Wallisch, Christine; Dunkler, Daniela; Rauch, Geraldine; De Bin, Riccardo; Heinze, Georg (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Statistical models are often fitted to obtain a concise description of the association of an outcome variable with some covariates. Even if background knowledge is available to guide preselection of covariates, stepwise ...
Data-driven methods for multiple sensor streams, with applications in the maritime industry 
Brandsæter, Andreas (Doctoral thesis / Doktoravhandling, 2020)
The cure model in perinatal epidemiology 
Stoltenberg, Emil Aas; Nordeng, Hedvig Marie Egeland; Ystrøm, Eivind; Samuelsen, Sven Ove (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
In the statistical literature, the class of survival analysis models known as cure models has received much attention in recent years. Cure models seem not, however, to be part of the statistical toolbox of perinatal ...
The Braess' paradox for pendent twins 
Ciardo, Lorenzo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Kemeny's constant κ(G) of a connected undirected graph G can be interpreted as the expected transit time between two randomly chosen vertices for the Markov chain associated with G. In certain cases, inserting a new edge ...
Robust active flow control over a range of Reynolds numbers using an artificial neural network trained through deep reinforcement learning 
Tang, Hongwei; Rabault, Jean; Kuhnle, Alexander; Wang, Yan; Wang, Tongguang (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
This paper focuses on the active flow control of a computational fluid dynamics simulation over a range of Reynolds numbers using deep reinforcement learning (DRL). More precisely, the proximal policy optimization (PPO) ...
Effects of rotational submarine slump dynamics on tsunami-genesis – new insight from idealized models and the 1929 Grand Banks event 
Zengaffinen, Thomas; Løvholt, Finn; Pedersen, Geir Kleivstul; Harbitz, Carl Bonnevie (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Sediment slumps are known to have generated important tsunamis such as the 1998 Papua New Guinea (PNG) and the 1929 Grand Banks events. Tsunami modellers commonly use solid blocks with short run-out distances to simulate ...
Pricing of commodity derivatives on processes with memory 
Benth, Fred Espen; Khedher, Asma; Vanmaele, Michèle (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Spot option prices, forwards and options on forwards relevant for the commodity markets are computed when the underlying process S is modelled as an exponential of a process ξ with memory as, e.g., a Volterra equation ...
Twenty-seven questions about the cubic surface 
Ranestad, Kristian; Sturmfels, Bernd (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
We present a collection of research questions on cubic surfaces in 3-space. These questions inspired the present collection of papers. This article serves as the introduction to the issue. The number of questions is meant ...
Existence of weak solutions to a certain homogeneous parabolic Neumann problem involving variable exponents and cross-diffusion 
Arumugam, Gurusamy; Erhardt, André Henrik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
This paper deals with a homogeneous Neumann problem of a nonlinear diffusion system involving variable exponents dependent on spatial and time variables and cross-diffusion terms. We prove the existence of weak solutions ...
Granular viscosity from plastic yield surfaces: The role of the deformation type in granular flows 
Rauter, Matthias; Barker, T.; Fellin, W. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Numerical simulations of granular flows with Navier–Stokes type models emerged in the last decade, challenging the well established depth-averaged models. The structure of these equations allows for extension to general ...
On deformations of quintic and septic hypersurfaces 
Ottem, John Christian; Schreieder, Stefan (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
An old question of Mori asks whether in dimension at least three, any smooth specialization of a hypersurface of prime degree is again a hypersurface. A positive answer to this question is only known in degrees two and ...
Failure of the integral Hodge conjecture for threefolds of Kodaira dimension zero 
Ottem, John Christian; Benoist, Olivier (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We prove that the product of an Enriques surface and a very general curve of genus at least 1 does not satisfy the integral Hodge conjecture for 1-cycles. This provides the first examples of smooth projective complex ...
Poincaré-Friedrichs inequalities of complexes of discrete distributional differential forms 
Christiansen, Snorre H; Licht, Martin Werner (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We derive bounds for the constants in Poincaré–Friedrichs inequalities with respect to mesh-dependent norms for complexes of discrete distributional differential forms. A key tool is a generalized flux reconstruction which ...
Towards definition of the risk premium function 
Krecar, Nikola; Benth, Fred Espen; Gubina, Andrej (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Successful trading in electricity markets relies on the market actor's ability to accurately forecast the electricity price. The fundamental electricity price models use market information, provided by various price drivers, ...
Variance and interest rate risk in unit-linked insurance policies 
Baños, David; Lagunas, Marc; Ortiz-Latorre, Salvador (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
One of the risks derived from selling long-term policies that any insurance company has arises from interest rates. In this paper, we consider a general class of stochastic volatility models written in forward variance ...
Bayesian seismic inversion for stratigraphic horizon, lithology, and fluid prediction 
Kolbjørnsen, Odd; Buland, Arild; Hauge, Ragnar; Røe, Per; Ndingwan, Abel Onana; Aker, Eyvind (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
We have developed an efficient methodology for Bayesian prediction of lithology and pore fluid, and layer-bounding horizons, in which we include and use spatial geologic prior knowledge such as vertical ordering of ...
Backtracking Gradient Descent Method and Some Applications in Large Scale Optimisation. Part 2: Algorithms and Experiments 
Truong, Tuyen Trung; Nguyen, Hang-Tuan (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
In this paper, we provide new results and algorithms (including backtracking versions of Nesterov accelerated gradient and Momentum) which are more applicable to large scale optimisation as in Deep Neural Networks. We also ...
A Bayesian Binomial Regression Model with Latent Gaussian Processes for Modelling DNA Methylation 
Hubin, Aliaksandr; Storvik, Geir Olve; Grini, Paul Eivind; Butenko, Melinka Alonso (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Epigenetic observations are represented by the total number of reads from a given pool of cells and the number of methylated reads, making it reasonable to model this data by a binomial distribution. There are numerous ...
Pincherle's theorem in reverse mathematics and computability theory 
Normann, Dag; Sanders, Sam (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We study the logical and computational properties of basic theorems of uncountable mathematics, in particular Pincherle's theorem, published in 1882. This theorem states that a locally bounded function is bounded on certain ...
Strengthened convexity of positive operator monotone decreasing functions 
Kirihata, Megumi; Yamashita, Makoto (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We prove a strengthened form of convexity for operator monotone decreasing positive functions defined on the positive real numbers. This extends Ando and Hiai's work to allow arbitrary positive maps instead of states (or ...
First-Order Concatenation Theory with Bounded Quantifiers 
Kristiansen, Lars; Murwanashyaka, Juvenal (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
We study first-order concatenation theory with bounded quantifiers. We give axiomatizations with interesting properties, and we prove some normal-form results. Finally, we prove a number of decidability and undecidability results.
Modelling extreme claims via composite models and threshold selection methods 
Wang, Yinzhi; Hobæk Haff, Ingrid; Huseby, Arne (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The existence of large and extreme claims of a non-life insurance portfolio influences the ability of (re)insurers to estimate the reserve. The excess over-threshold method provides a way to capture and model the typical ...
Experiments on air entrainment produced by a circular free falling jet 
Ramirez De La Torre, Reyna Guadalupe; Jensen, Atle; Kuchta, Miroslav (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The process of a circular free falling jet entering an idle pool was studied with the objective of determining a relation between the naturally occurring disturbances on the jet surface and air entrainment. To this end the ...
Fully-dynamic risk-indifference prices and no-good-deal bounds 
Bion-Nadal, Jocelyne; Di Nunno, Giulia (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
The seller's risk-indifference price evaluation is studied. We propose a dynamic risk-indifference pricing criterion derived from fully-dynamic risk measures on the $L_p$-spaces for $p\in [1,\infty]$. The concept of ...
Measure-theoretic Uniformity and the Suslin Functional 
Normann, Dag (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Given a set A in the unit interval and the associated Lebesgue measure λ, it is a natural question whether we may (in some sense) compute the measure λ(A) in terms of the set A. Under the moniker measure theoretic uniformity, ...
Dynamics of a neuron-glia system: the occurrence of seizures and the influence of electroconvulsive stimuli 
Erhardt, André Henrik; Mardal, Kent-Andre; Schreiner, Jakob Emil (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
In this paper, we investigate the dynamics of a neuron–glia cell system and the underlying mechanism for the occurrence of seizures. For our mathematical and numerical investigation of the cell model we will use bifurcation ...
On Interpretability between some weak essential undecidable theories. 
Kristiansen, Lars; Murwanashyaka, Juvenal (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We introduce two essentially undecidable first-order theories WT and T. The intended model for the theories is a term model. We prove that WT is mutually interpretable with Robinson’s R. Moreover, we prove that Robinson’s ...
Modelling the joint behaviour of electricity prices in interconnected markets 
Christensen, Troels Sønderby; Benth, Fred Espen (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
The liberalization of energy markets worldwide during recent decades has introduced severe implications for the price formation in these markets. Especially within the European day-ahead electricity markets, increased ...
DNA copy number motifs are strong and independent predictors of survival in breast cancer 
Pladsen, Arne Valebjørg; Nilsen, Gro; Rueda, Oscar M.; Aure, Miriam Ragle; Borgan, Ørnulf; Liestøl, Knut; Vitelli, Valeria; Frigessi Di Rattalma, Arnoldo; Langerød, Anita; Mathelier, Anthony; Engebråten, Olav; Kristensen, Vessela N.; Wedge, David C.; Van Loo, Peter; Caldas, Carlos; Børresen-Dale, Anne-Lise; Russnes, Hege Elisabeth Giercksky; Lingjærde, Ole Christian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Somatic copy number alterations are a frequent sign of genome instability in cancer. A precise characterization of the genome architecture would reveal underlying instability mechanisms and provide an instrument for outcome ...
Forward-backward stochastic differential equation games with delay and noisy memory 
Dahl, Kristina Rognlien (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The goal of this paper is to study a stochastic game connected to a system of forward-backward stochastic differential equations (FBSDEs) involving delay and noisy memory. We derive sufficient and necessary maximum principles ...
Real algebraic curves on real del Pezzo surfaces 
Manzaroli, Matilde (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Abstract The study of the topology of real algebraic varieties dates back to the work of Harnack, Klein, and Hilbert in the 19th century; in particular, the isotopy-type classification of real algebraic curves ...
Two-phase flow simulations at 0 - 4° inclination in an eccentric annulus 
Friedemann, Christopher; Mortensen, Mikael; Nossen, Jan (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Co-current two-phase simulations of gas-liquid flow with mixture velocities from 1.2 to 4.2 m/s were run in a partially eccentric annulus and compared with entirely eccentric and concentric experimental data collected at ...
Some new theoretical and computational results around the Jacobian conjecture 
Truong, Tuyen Trung (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
In this paper, we study a so-called Condition C1 on square matrices with complex coefficients and a weaker Condition C2. For Druzkowski maps Condition C2 is equivalent to the Jacobian conjecture. We show that these conditions ...
Approximating Expected Value of an Option with Non-Lipschitz Payoff in Fractional Heston-Type Model 
Mishura, Yuliya; Yurchenko-Tytarenko, Anton (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
In this paper, we consider option pricing in a framework of the fractional Heston-type model with [Formula: see text]. As it is impossible to obtain an explicit formula for the expectation [Formula: see text] in this case, ...
Membrane budding dynamics by diffusion and kinetic recruitment of proteins 
Rojas Molina, Rossana (Doctoral thesis / Doktoravhandling, 2020)
Biological membranes have fundamental implications in a large number of processes in the cell. As such, membranes possess important properties: they can change their shape as an elastic surface, and they are fluid, which ...
Confidence Distributions for FIC Scores 
Cunen, Celine; Hjort, Nils Lid (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
When using the Focused Information Criterion (FIC) for assessing and ranking candidate models with respect to how well they do for a given estimation task, it is customary to produce a so-called FIC plot. This plot has the ...
Automorphisms of Hilbert schemes of points on surfaces 
Belmans, Pieter; Oberdieck, Georg; Rennemo, Jørgen Vold (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We show that every automorphism of the Hilbert scheme of n points on a weak Fano or general type surface is natural, i.e., induced by an automorphism of the surface, unless the surface is a product of curves and n=2. In ...
Focused model selection for linear mixed models with an application to whale ecology 
Cunen, Celine; Hjort, Nils Lid; Walløe, Lars (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
A central point of disagreement, in certain long-standing discussions about a particular whaling dataset in the Scientific Committee of the International Whaling Commission, has directly involved model selection issues for ...
The homological projective dual of Sym2 P(V) 
Rennemo, Jørgen Vold (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We study the derived category of a complete intersection X of bilinear divisors in the orbifold Sym2P(V) . Our results are in the spirit of Kuznetsov’s theory of homological projective duality, and we describe a homological ...
Comparative effectiveness of dopamine agonists and monoamine oxidase type-B inhibitors for Parkinson’s disease: a multiple treatment comparison meta-analysis 
Binde, Caroline Ditlev; Tvete, Ingunn Fride; Gåsemyr, Jørund Inge; Natvig, Bent; Klemp, Marianne (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Abstract Purpose To investigate the comparative effectiveness of dopamine agonists and monoamine oxidase type-B (MAO-B) inhibitors available for treatment of Parkinson’s disease. ...
Experimental evidence for a universal threshold characterizingwave-induced sea ice break-up 
Voermans, Joey; Rabault, Jean; Filchuk, Kirill V.; Ryzhov, Ivan; Heil, Petra; Marchenko, Aleksey; Collins, Clarence O.; dabboor, mohammed; Sutherland, Graig J.; Babanin, Alexander V. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Waves can drastically transform a sea ice cover by inducing break-up over vast distances in the course of a few hours. However, relatively few detailed studies have described this phenomenon in a quantitative manner, and ...
Predicting time to graduation at a large enrollment American university 
Aiken, John Mark; De Bin, Riccardo; Hjorth-Jensen, Morten; Caballero, Marcos Daniel (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The time it takes a student to graduate with a university degree is mitigated by a variety of factors such as their background, the academic performance at university, and their integration into the social communities of ...
Cross-streamer wavefield reconstruction through wavelet domain 
Greiner, Thomas Larsen; Hlebnikov, Volodya; Lie, Jan Erik; Kolbjørnsen, Odd; Kjeldsrud Evensen, Andreas; Harris Nilsen, Espen; Vinje, Vetle; Gelius, Leiv-J. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Seismic exploration in complex geologic settings and shallow geologic targets has led to a demand for higher spatial and temporal resolution in the final migrated image. Conventional marine seismic and wide-azimuth data ...
Confidence in confidence distributions! 
Cunen, Celine; Hjort, Nils Lid; Schweder, Tore (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
The recent article ‘Satellite conjunction analysis and the false confidence theorem’ (Balch et al. 2019, Satellite conjunction analysis and the false confidence theorem. Proc. R. Soc. A475, 20180565) points to certain ...
Statistical sightings of better angels: Analysing the distribution of battle-deaths in interstate conflict over time 
Cunen, Celine Marie Løken; Hjort, Nils Lid; Nygård, Håvard Mokleiv (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Have great wars become less violent over time, and is there something we might identify as the long peace? We investigate statistical versions of such questions, by examining the number of battle-deaths in the Correlates ...
Psychometrics and the modelling of publication bias 
Moss, Jonas (Doctoral thesis / Doktoravhandling, 2020)
Experimental investigations of two-phase flows. Dynamics of stratified and particle-laden flows in pipes and flumes 
Vollestad, Petter (Doctoral thesis / Doktoravhandling, 2020)
Airflow above water waves represents a challenging problem, relevant both in air-sea interactions and for multiphase pipe flows. Understanding this interaction is important to accurately predict the exchange of heat, ...
Towards the degree of the PGL(4)-orbit of a cubic surface 
Cazzador, Elisa; Skauli, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
We study the action of the group PGL(4) on the parameter space P 19 of complex cubic surfaces. Specifically, we look at how the techniques used by Aluffi and Faber in [1] can be extended to compute the degree of the orbit ...
BayesMallows: An R Package for the Bayesian Mallows Model 
Sørensen, Øystein; Crispino, Marta; Liu, Qinghua; Vitelli, Valeria (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Abstract BayesMallows is an R package for analyzing preference data in the form of rankings with the Mallows rank model, and its finite mixture extension, in a Bayesian framework. The model is grounded on the idea that the ...
A second-order numerical method for the aggregation equations 
Solem, Susanne; Fjordholm, Ulrik Skre; Carrillo, José A (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Inspired by so-called TVD limiter-based second-order schemes for hyperbolic conservation laws, we develop a formally second-order accurate numerical method for multi-dimensional aggregation equations. The method allows for ...
CARMA Approximations and Estimation 
Lavagnini, Silvia (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
CARMA(p, q) processes are compactly defined through a stochastic differential equation (SDE) involving q + 1 derivatives of the Lévy process driving the noise, despite this latter having in general no differentiable paths. ...
Strong submeasures and applications to non-compact dynamical systems 
Truong, Tuyen Trung (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Diffusion on membrane domes, tubes and pearling structures 
Rojas Molina, Rossana Virginia; Liese, Susanne; Carlson, Andreas (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Diffusion is a fundamental mechanism for protein distribution in cell membranes. These membranes often exhibit complex shapes, which range from shallow domes to elongated tubular or pearl-like structures. Shape complexity ...
Existence and uniqueness of weak solutions to parabolic problems with nonstandard growth and cross diffusion 
Arumugam, Gurusamy; Erhardt, André Henrik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The Fourier-Stieltjes algebra of a C*-dynamical system II 
Bedos, Erik Christopher; Conti, Roberto (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We continue our study of the Fourier–Stieltjes algebra associated to a twisted (unital, discrete) C*-dynamical system and discuss how the various notions of equivalence of such systems are reflected at the algebra level. ...
On environmental contours for marine and coastal design 
Ross, Emma; Astrup, Ole Christian; Bitner-Gregersen, Elzbieta; Bunn, Nigel; Feld, Graham; Gouldby, Ben; Huseby, Arne; Liu, Ye; Randell, David; Vanem, Erik; Jonathan, Philip (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Environmental contours are used in structural reliability analysis of marine and coastal structures as an approximate means to locate the boundary of the distribution of environmental variables, and hence sets of environmental ...
C*-algebras of right LCM monoids and their equilibrium states 
Brownlowe, Nathan; Larsen, Nadia S.; Ramagge, Jacqui; Stammeier, Nicolai (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Astrocytic Ca2+ signaling is reduced during sleep and is involved in the regulation of slow wave sleep 
Bojarskaite, Laura; Bjørnstad, Daniel Marelius; Pettersen, Klas; Cunen, Celine; Hermansen, Gudmund Horn; Åbjørsbråten, Knut Sindre; Chambers, Anna; Sprengel, Rolf; Vervaeke, Koen Gerard Alois; Tang, Wannan; Enger, Rune; Nagelhus, Erlend Arnulf (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Astrocytic Ca2+ signaling has been intensively studied in health and disease but has not been quantified during natural sleep. Here, we employ an activity-based algorithm to assess astrocytic Ca2+ signals in the neocortex ...
Stability and accuracy in compressive sensing and deep learning 
Antun, Vegard (Doctoral thesis / Doktoravhandling, 2020)
There are currently two paradigm shifts happening in society and scientific computing: (1) Artificial Intelligence (AI) is replacing humans in problem solving, and, (2) AI is replacing the standard algorithms in computational ...
Capillary deformation of ultrathin glassy polymer films by air nanobubbles 
Ren, Shuai; Pedersen, Christian; Carlson, Andreas; Salez, Thomas; Wang, Yuliang (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Confined glasses and their anomalous interfacial rheology raise important questions in fundamental research and numerous practical applications. In this work, we study the influence of interfacial air nanobubbles on the ...
A Novel Method for Circuits of Perfect Electric Conductors in Unstructured Particle-in-Cell Plasma–Object Interaction Simulations 
Marholm, Sigvald; Darian, Diako; Mortensen, Mikael; Miloch, Wojciech Jacek; Marchand, Richard (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
A novel numerical method has been developed that incorporates electrically conducting objects into particle-in-cell simulations of electrostatic plasma. The method allows multiple objects connected by voltage and current ...
Air Traffic Flow Management with Layered Workload Constraints 
Mannino, Carlo; Nakkerud, Andreas; Sartor, Giorgio (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Many regions of the world are currently struggling with congested airspace, and Europe is no exception. Motivated by our collaboration with relevant European authorities and companies in the Single European Sky ATM Research ...
KMS States on Nica-Toeplitz C∗-algebras 
Afsar, Zahra; Larsen, Nadia S.; Neshveyev, Sergey (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Given a quasi-lattice ordered group (G, P) and a compactly aligned product system X of essential C∗-correspondences over the monoid P, we show that there is a bijection between the gauge-invariant KMSβ-states on the ...
Birnbaum criticality and importance measures for multistate systems with repairable components 
Huseby, Arne; Kalinowska, Martyna; Abrahamsen, Tobias (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
We suggest four new measures of importance for repairable multistate systems based on the classical Birnbaum measure. Periodic component life cycles and general semi-Markov processes are considered. Similar to the Birnbaum ...
Statistical solutions of hyperbolic systems of conservation laws: Numerical approximation 
Fjordholm, Ulrik Skre; Lye, Kjetil; Mishra, Siddhartha; Weber, Franziska (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Statistical solutions are time-parameterized probability measures on spaces of integrable functions, which have been proposed recently as a framework for global solutions and uncertainty quantification for multi-dimensional ...
On instabilities of deep learning in image reconstruction and the potential costs of AI 
Antun, Vegard; Renna, Francesco; Poon, Clarice; Adcock, Ben; Hansen, Anders Christian (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Deep learning, due to its unprecedented success in tasks such as image classification, has emerged as a new tool in image reconstruction with potential to change the field. In this paper we demonstrate a crucial phenomenon: ...
Coupling rheology and segregation in granular flows 
Barker, T.; Rauter, Matthias; Maguire, E. S. F.; Johnson, C. G.; Gray, J. M. N. T. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
During the last fifteen years there has been a paradigm shift in the continuum modelling of granular materials; most notably with the development of rheological models, such as the μ(I) μ(I) -rheology (where μ μ is the ...
On Two Existing Approaches to Statistical Analysis of Social Media Data 
Patone, Martina; Zhang, Li Chun (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Using social media data for statistical analysis of general population faces commonly two basic obstacles: firstly, social media data are collected for different objects than the population units of interest; secondly, the ...
Partial identification of latent correlations with binary data 
Grønneberg, Steffen; Moss, Jonas; Foldnes, Njål (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
The tetrachoric correlation is a popular measure of association for binary data and estimates the correlation of an underlying normal latent vector. However, when the underlying vector is not normal, the tetrachoric ...
Noncommutative Borsuk–Ulam-type conjectures revisited 
Neshveyev, Sergey; Dabrowski, Ludwik; Hajac, Piotr M. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Counteracting deceptive responding in the Finnish Investigative Instrument of Child Sexual Abuse (FICSA) 
Tadei, Alessandro; Haajanen, Juulia; Pensar, Johan; Santtila, Pekka; Antfolk, Jan (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Unfounded child sexual abuse (CSA) allegations take investigative resources from real cases and have detrimental consequences for the people involved. The Finnish Investigative Instrument of Child Sexual Abuse (FICSA) ...
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