Browsing Bergen Open Research Archive by Title
Now showing items 21786-21805 of 34506
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Nonholonomic geometry on finite and infinite dimensional Lie groups and rolling manifolds
(Doctoral thesis, 2012-03-30)Part I: We start by giving some background on the topics discussed in this thesis. The main topic of the thesis is nonholonomic geometry. In Chapter 1 we give an introduction of nonholonomic geometry in the context of ... -
Nonhydrostatic pressure in ocean models with focus on wind driven internal waves
(Doctoral thesis, 2010-02-05) -
Nonindexical contextualism. Ikke-indeksikalsk kontekstualisme
(Master thesis, 2017-12-20) -
Noninvasive ventilation in COVID-19 patients aged ≥ 70 years—a prospective multicentre cohort study
(Journal article; Peer reviewed, 2022)Background Noninvasive ventilation (NIV) is a promising alternative to invasive mechanical ventilation (IMV) with a particular importance amidst the shortage of intensive care unit (ICU) beds during the COVID-19 pandemic. ... -
Nonlinear Analysis of Motor Activity Shows Differences between Schizophrenia and Depression: A Study Using Fourier Analysis and Sample Entropy
(Peer reviewed; Journal article, 2011-01-28)The purpose of this study has been to describe motor activity data obtained by using wrist-worn actigraphs in patients with schizophrenia and major depression by the use of linear and non-linear methods of analysis. Different ... -
Nonlinear cross-spectrum analysis via the local Gaussian correlation
(Journal article, 2017)Spectrum analysis can detect frequency related structures in a time series \(\{Y_t\}_{t\in\mathbb{Z}}\), but may in general be an inadequate tool if asymmetries or other nonlinear phenomena are present. This limitation is ... -
A Nonlinear Differential Equation Solver With Potential Application to Pelton Turbines
(Doctoral thesis, 2016-05-02)The focus in this thesis is the development and implementation of a new method for solving nonlinear differential equations on a grid. The method’s novelty lies in the way it represents continuously distributed variables ... -
Nonlinear echoes from encapsulated antibubbles
(Peer reviewed; Journal article, 2015-09-19)An antibubble consists of a liquid droplet, surrounded by a gas, often with an encapsulating shell. Antibubbles of microscopic sizes suspended in fluids are acoustically active in the ultrasonic range. Antibubbles have ... -
Nonlinear Effects During Transient Fluid Flow in Reservoirs as Encountered in Well-Test Analysis
(Department of Applied Mathematics report, Research report, 1985-03) -
Nonlinear equations of acoustics in inhomogeneous, thermoviscous fluids
(Department of Applied Mathematics report, Research report, 1991-03) -
Nonlinear feedback shift registers and generating of binary de Bruijn sequences
(Master thesis, 2016-11-21) -
A Nonlinear Formulation of Radiation Stress and Applications to Cnoidal Shoaling
(Journal article; Peer reviewed, 2021)In this article, we provide formulations of energy flux and radiation stress consistent with the scaling regime of the Korteweg–de Vries (KdV) equation. These quantities can be used to describe the shoaling of cnoidal waves ... -
A nonlinear multi-scale model for blood circulation in a realistic vascular system
(Journal article; Peer reviewed, 2021)In the last decade, numerical models have become an increasingly important tool in biological and medical science. Numerical simulations contribute to a deeper understanding of physiology and are a powerful tool for better ... -
Nonlinear propagation and interaction of collinear sound beams
(Department of Applied Mathematics report, Research report, 1989-10) -
Nonlinear response of atmospheric blocking to early Winter Barents-Kara seas warming: An idealized model study
(Journal article; Peer reviewed, 2021)Wintertime Ural blocking (UB) has been shown to play an important role in cold extremes over Eurasia, and thus it is useful to investigate the impact of warming over the Barents–Kara Seas (BKS) on the behavior of Ural ... -
Nonlinear spectral analysis via the local Gaussian correlation
(Journal article, 2017)The spectral distribution \(f(\omega)\) of a stationary time series \(\{Y_t\}_{t\in\mathbb{Z}}\) can be used to investigate whether or not periodic structures are present in \(\{Y_t\}_{t\in\mathbb{Z}}\), but \(f(\omega)\) ... -
Nonlinear Spectral Analysis: A Local Gaussian Approach
(Journal article; Peer reviewed, 2022)The spectral distribution f(ω) of a stationary time series {Yt}t∈Z can be used to investigate whether or not periodic structures are present in {Yt}t∈Z, but f(ω) has some limitations due to its dependence on the autocovariances ... -
Nonlinear Spectrum Analysis based on the Local Gaussian Correlation and Model Selection for Copulas
(Doctoral thesis, 2017-11-20) -
The nonlinearities in the galvanostatic charging curves of supercapacitors provide insights into charging mechanisms
(Journal article; Peer reviewed, 2022)Supercapacitors are often charged using constant currents. The capacitance can be determined from the slope of the voltage-time curve if the measured voltage over the supercapacitor increases linearly with time. However, ... -
Nonlocal Models for Undular Bores
(Master thesis, 2022-06-01)