Fakultet for naturvitenskap og teknologi: Nye registreringer
Viser treff 61-80 av 4889
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Seasonal and interannual variability in hydrography and currents along the Nansen Legacy transect across the Barents Sea
(Master thesis; Mastergradsoppgave, 2023-12-20)The Barents Sea is an Arctic shelf sea that is an important site forwater mass formation and transformation. It is characterized by interactions between Atlanticand Arctic-originWaters, and by strong seasonality in terms of alternating atmospheric and sea-ice conditions throughout the year. How these aspects impact the seasonal evolution of the water column properties is yet to be fully ... -
Optimal Positioning for Transceivers in Network
(Master thesis; Mastergradsoppgave, 2024-05-22)This thesis investigates the use of optimization techniques to configure a network of short-range transceivers for best coverage of a topographic layer. Three methods are presented, tested, and analysed. The thesis is inspired by the limited range of underwater wireless communication transceivers. The coverage is defined by free "Line of Sight" (LOS) and a 100 meter transceiver range. The terrain ... -
Deciphering climate change impacts on resource extraction supply chain: a systematic review
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024)Mining is becoming increasingly vulnerable to the effects of climate change (CC). The consequences of changing weather patterns, such as extreme weather events that can damage equipment, infrastructure, mining facilities, and operation interruption, are the source of the vulnerability. The new demand initiated by governments and international agreements put extra pressure on mining industries to ... -
Increasing fluctuations in the Arctic summer sea ice cover are expected with future global warming
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-11)The loss of Arctic sea ice (ASI) represents a major transformation in the Arctic region, impacting regional and global climate, ecosystems, and socio-economic structures. Observational and reanalysis data have consistently shown a notable shift in polar environmental conditions over recent decades, marked by a substantial reduction in the ASI area and a rise in the variability in its coverage and ... -
Leveraging tensor kernels to reduce objective function mismatch in deep clustering
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-29)Objective Function Mismatch (OFM) occurs when the optimization of one objective has a negative impact on the optimization of another objective. In this work we study OFM in deep clustering, and find that the popular autoencoder-based approach to deep clustering can lead to both reduced clustering performance, and a significant amount of OFM between the reconstruction and clustering objectives. To ... -
Arctic summer sea ice loss will accelerate in coming decades
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-17)The Arctic sea ice (ASI) is expected to decrease with further global warming. However, considerable uncertainty remains regarding the temperature range that would lead to a completely ice-free Arctic. Here, we combine satellite data and a large suite of models from the latest phase of the Coupled Model Intercomparison Project (CMIP6) to develop an empirical, observation-based projection of the ... -
Extent, duration and timing of the sea ice cover in Hornsund, Svalbard in 2014–2023
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-27)The Sentinel-1A/B synthetic aperture radar (SAR) imagery archive between 14 October 2014 and 29 June 2023 was used in combination with a segmentation algorithm to create a series of binary ice/open-water maps of Hornsund fjord, Svalbard, at 50 m resolution for nine seasons (2014/15 to 2022/23). The near-daily (1.57 d mean temporal resolution) maps were used to calculate sea ice coverage for the ... -
Fluid Flow and seafloor gas seepage studies of Tampen Spurr
(Mastergradsoppgave; Master thesis, 2024-05-16)The southern areas of the North Sea are shallow waters with a depth of roughly 50m, which includes the German section, Dutch section, Danish and the UK sector of the North Sea. The north of the North Sea is much deeper but generally less than 200m, except within the Norwegian Trough/Trench towards the northeast, the only region of deep waters. Significant oil and gas discoveries have been made within ... -
Offshore Wind Prediction with Graph Neural Networks
(Mastergradsoppgave; Master thesis, 2024-06-14)Offshore wind energy, especially in regions like the Norwegian Arctic, is a promising source of renewable energy. Graph Neural Networks (GNNs) have shown potential in modeling complex systems like weather, making them suitable for improving wind resource assessments. This thesis investigates the use of GNNs for predicting offshore wind patterns, utilizing high-resolution Synthetic Aperture Radar ... -
Recent Changes in Mid-latitude Wave Propagation
(Mastergradsoppgave; Master thesis, 2024-06-12)In recent years climate change in the polar areas has attracted a lot of attention. Not only for its consequences in polar areas, but also for its possible effects on lower latitudes. A reduced temperature gradient between the polar areas is expected to weaken the mid-latitude jet stream. This weaker jet stream is hypothesised to lead to a reduction in the propagation velocity of atmospheric Rossby ... -
Wind resource assessment using LiDAR
(Mastergradsoppgave; Master thesis, 2024-06-07)This thesis presents a comprehensive wind resource assessment for the expansion of the Fakken wind park in Norway, leveraging Light Detection and Ranging (LiDAR) technology. The measurement campaign conducted from December 2022 to June 2023, aims to detail LiDAR measurement methodologies, analyze collected data, and estimate wind energy production. -
Dual Radar Detections of Meteors Using Calibrated EISCAT UHF Data
(Mastergradsoppgave; Master thesis, 2024-06-03)The atmosphere of Earth experiences a continuous entry of particles of various sizes originating from several sources. Meteoroids, which are called meteors when entering the atmosphere, are particles that can be measured by radars through scattering off the meteor head plasma which forms around the meteor. These measurements can give information on the processes the meteor undergoes as it travels ... -
Investigation into the photon interaction of small mesospheric dust and its impact on the ionospheric charge balance
(Mastergradsoppgave; Master thesis, 2024-05-31)This thesis investigates the charging mechanisms of nano-sized meteoric smoke particles (MSP) in the mesosphere, with a particular focus on the photoionization and photodetachment processes on MSP assuming different materials. The study begins with three theoretical chapters that lay the ground- work for understanding relevant topics like the atmospheric region in question, MSP, the solar ... -
Pulsating Aurora: Optical observations and modelling of the time-variation of ionospheric response to precipitation of pitch-angle-scattered electrons from the magnetosphere
(Mastergradsoppgave; Master thesis, 2024-01-29)This thesis explores the mechanisms governing pulsating auroras by combining observational analysis with theoretical simulations using the AURORA model. The AURORA model simulates electron transport and ionospheric responses, playing a key role in replicating the abrupt onset precipitation of electrons from source altitudes at 3RE, 4.4RE, 6.1RE, and 7.6RE. Eight events of pulsating aurora were ... -
Annerledes og likeverdig: førstelektorstillingens skjebne under akademias konvensjoner
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-07)I Norge finnes to karriereveier innen undervisning og forskning i høyere utdanning. Veien fra stipendiat via førsteamanuensis til professor er den mest brukte. Men en tredel av de tilsatte i høyere utdanning er tilsatt i en karrierestige som går fra universitets- eller høgskolelektor via førstelektor til dosent. De to karriereveiene kan sies å være knyttet til ulike kunnskapsregimer. I de siste 20 ... -
Do Economics Matter in the Flight Deck? A Statistical Analysis
(Master thesis; Mastergradsoppgave, 2024-06-03)The aviation industry operates within a dynamic framework influenced by economic factors, safety concerns, and operational considerations. It is an industry easily influenced by global events and geopolitics, making airlines straddle a fine line between profitability and financial ruin. The purpose of this paper is to explore the importance of financial factors in the decision-making processes of ... -
A conviction in marine operations – a step back in aviation safety?
(Master thesis; Mastergradsoppgave, 2024-05-30)December 2023, the Norwegian court convicted the Officer On Watch on KNM Helge Ingstad after a collision with the tanker Sola TS. This study investigates how a conviction of an operator in naval industry might influence the just culture in the Norwegian aviation industry. A questionnaire was sent to 180 persons January 5th, 2024. Theories on just -and reporting culture are presented. This study will ... -
Hvordan kan en styrke sikkerhetsbarrieren mennesket i flyoperasjoner?
(Master thesis; Mastergradsoppgave, 2024-05-27)Luftfartens historie er kort. Begynnelsen var preget av modige pionerer som trosset farer for å erobre himmelen. Etter hvert som luftfarten ble en kommersiell virksomhet, kom krav om høy sikkerhet. Etter en lang periode med prioritering av teknisk sikkerhet, er oppmerksomheten nå på sikkerhetsstyring, og på menneskets rolle i ulykker. Den moderne luftfarten er kompleks. Forskere som Reason, ... -
Modelling potential fluctuations due to filaments in the SOL
(Master thesis; Mastergradsoppgave, 2024-06-01)The filtered Poisson process are often used in analysing the fluctuations in the scrape-off layer. This thesis investigates how the FPP-model represents both the ion saturation current, Jsat and the velocity signals. The signals are simulated using blobmodel [1], with different degree of overlap, for K = 103, K = 104 and K = 105, different amplitudes, set to constant or exponentially distributed, and ... -
Lederskap og flytryggingskultur - Ledererfaringer fra det norske kampflymiljøet
(Master thesis; Mastergradsoppgave, 2024-06-03)Denne masteravhandlingen undersøker hvordan lederadferd påvirker ivaretakelse og utvikling av flytryggingskultur. Studien er kvalitativ, og datainnsamlingen er gjort gjennom semi-strukturerte intervjuer med ledere i det norske jagerflymiljøet. Problemstillingen det tas utgangspunkt i er «Hvordan jobber operative ledere i kampflyvåpenet for å ivareta og videreutvikle en positiv flytryggingskultur?». ...