Browsing Faculty of Mathematics and Natural Sciences by Title
Now showing items 1638-1657 of 9919
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The Day-to-day Supply Responses of a Limited-entry Mixed Fishery
(Journal article; Peer reviewed, 2021)Small-scale fishers’ short-run supply decisions are understudied, often because of data limitations. We utilize a unique dataset of daily catches and prices from a mixed-species trawl fishery in Taiwan, characterized by ... -
Dayside and nightside magnetic field responses at 780 km altitude to dayside reconnection
(Peer reviewed; Journal article, 2017-02)During southward interplanetary magnetic field, dayside reconnection will drive the Dungey cycle in the magnetosphere, which is manifested as a two‐cell convection pattern in the ionosphere. We address the response of the ... -
Dayside Field-Aligned Current Impacts on Ionospheric Irregularities
(Journal article; Peer reviewed, 2020)Global Navigation Satellite Systems (GNSS) are subject to disturbances caused by plasma irregularities in the ionosphere. Studies have suggested that in addition to the gradient drift and Kelvin‐Helmholtz instabilities, ... -
Dayside Transient Phenomena and Their Impact on the Magnetosphere and Ionosphere
(Journal article; Peer reviewed, 2022)Dayside transients, such as hot flow anomalies, foreshock bubbles, magnetosheath jets, flux transfer events, and surface waves, are frequently observed upstream from the bow shock, in the magnetosheath, and at the magnetopause. ... -
DCC-GARCH modeller med ulike avhengighetsstrukturer
(Master thesis, 2013-03-14)Hovedfokuset i denne oppgaven er å finne gode metoder for modellering av volatilitet og avhengighetsstruktur i finansielle porteføljer. En spesifikk multivariat GARCH modell, Dynamic Conditional Correlation (DCC-) GARCH, ... -
De-identification of medical images using object-detection models, generative adversarial networks and perceptual loss
(Master thesis, 2021-06-01)Medical images play an essential role in the process of diagnostics and detection of a variety of diseases. Whether it being anatomical features or molecular cells, medical imaging help visualize and gain insight into the ... -
Dealing with uncertainty in ecosystem models along three axes; resolution, forcing and projections
(Doctoral thesis, 2023-05-24)With the imminent threat of climate change, there is an urgent need to understand how warmer temperatures will affect marine ecosystems. Models provide the best tools to study the future, but although great efforts have ... -
Deanonymizing communications on The Onion Router (TOR) network with Deep Learning
(Master thesis, 2021-06-01)Staying anonymous on the Internet is becoming increasingly difficult. Advertisements for services that to some extent offer privacy are frequent, and the general population seems to be more aware of privacy than previously. ... -
Decadal Changes in Ventilation and Anthropogenic Carbon in the Nordic Seas
(Journal article; Peer reviewed, 2023)We evaluate the decadal evolution of ventilation and anthropogenic carbon (Cant) in the Nordic Seas between 1982 and the 2010s. Ventilation changes on decadal timescale are identified by evaluating decadal changes in mean ... -
Decadal Predictability of the North Atlantic Eddy-Driven Jet in Winter
(Journal article; Peer reviewed, 2023)This paper expands on work showing that the winter North Atlantic Oscillation (NAO) is predictable on decadal timescales to quantify the skill in capturing the North Atlantic eddy-driven jet's location and speed. By focusing ... -
Decadal prediction of Sahel rainfall: where does the skill (or lack thereof) come from?
(Peer reviewed; Journal article, 2016-12)Previous works suggest decadal predictions of Sahel rainfall could be skillful. However, the sources of such skill are still under debate. In addition, previous results are based on short validation periods (i.e. less than ... -
Decadal solar irradiance variability in northern Europe
(Doctoral thesis, 2014-11-28)Shortwave (SW) radiation from the Sun is the external energy source on Earth and the fundamental input of energy into the climate system. Variations of the SW radiation and its transfer through the atmosphere can have ... -
Decadal trends in ocean acidification from the Ocean Weather Station M in the Norwegian Sea
(Journal article; Peer reviewed, 2022)The Ocean Weather Station M (OWSM) is situated at a fixed position in the Norwegian Sea, one of the major basins of the Nordic Seas, which represents an important area for uptake of atmospheric CO2 as well as deep water ... -
Decadal Trends in the Oceanic Storage of Anthropogenic Carbon From 1994 to 2014
(Journal article; Peer reviewed, 2023)The oceanic uptake and resulting storage of the anthropogenic CO2 (Cant) that humans have emitted into the atmosphere moderates climate change. Yet our knowledge about how this uptake and storage has progressed in time ... -
Decay estimates of Green's matrices for discrete-time linear periodic systems
(Journal article; Peer reviewed, 2023)We study periodic Lyapunov matrix equations for a general discrete-time linear periodic system Bpxp−Apxp−1=fp, where the matrix coefficients Bp and Ap can be singular. The block coefficients of the inverse operator of the ... -
Decay of solitary waves of fractional Korteweg-de Vries type equations
(Journal article; Peer reviewed, 2023)We study the solitary waves of fractional Korteweg-de Vries type equations, that are related to the 1- dimensional semi-linear fractional equations: |D|αu + u − f (u) = 0, with α ∈ (0, 2), a prescribed coefficient p∗(α), ... -
Deciding EA-equivalence via invariants
(Journal article; Peer reviewed, 2022)We define a family of efficiently computable invariants for (n,m)-functions under EA-equivalence, and observe that, unlike the known invariants such as the differential spectrum, algebraic degree, and extended Walsh spectrum, ... -
Deciphering Spatio-Temporal Variations in the Auroral Ionosphere using Magnetometer Data
(Doctoral thesis, 2024-03-22)Den polare ionosfæren er et dynamisk plasma-miljø dominert av koblingen mellom solvinden og jordens magnetosfære. Nordlyset, plasma-bevegelsen og elektriske strømmer i ionosfæren er skalert og drevet av dagsidekoblingen ... -
Deciphering the metamorphic framework of ophiolite alteration and devolatilization at Linnajarvi, N-Norway
(Master thesis, 2021-12-01)Kvitfjell ultramafic body is one of around 20 ultramafic bodies found in the Linnajavri area of Northern Norway. These ultramafic fragments are situated within the Köli Nappe of the Upper Allochthon in the Caledonian ... -
Decision support framework for choosing treatment
(Master thesis, 2019-06-29)With the release of ”Fritt behandlingsvalg” in 2015, Norwegian patients got the right to select where they want to attend special treatment. As of now, there is no easy way to compare treatment centers, as the information ...