Viser treff 521-540 av 5363

    • Langvarig bortfall av strømforsyning i bygd og by 

      Nilsen, Pia (Master thesis; Mastergradsoppgave, 2024-05-30)
      Det er vanskelig å se for seg hvordan norske innbyggere skulle klart seg uten tilgang på strøm. Det vil bli utfordrende å gjennomføre arbeidet sitt, handle på butikken, oppbevare og tilberede mat, og ha god hygiene uten å benytte seg av strøm. Krig i Europa og økende forekomst av ekstremvær kan føre til at en også i Norge vil kunne oppleve å miste strømmen oftere. Denne masteroppgaven ønsker å ...
    • Exploring methane detection with Sentinel-2 data: capabilities for monitoring landfill emissions 

      Buseth, Johanna Mankova (Master thesis; Mastergradsoppgave, 2024-06-01)
      Methane is an extremely potent greenhouse gas, as it is about 80 times more effective at trapping heat than carbon dioxide. To mitigate global warming and the related consequences, reducing our emissions of methane is crucial. Therefore, being able to detect unknown releases and monitor the effects of emission mitigation efforts is essential. A few satellites with methane monitoring as one of their ...
    • Automatic Building Structure Extraction from Aerial Photographs using Transformers 

      Foss, Sigbjørn Valde (Mastergradsoppgave; Master thesis, 2024-06-01)
      This thesis explores a method for automatically extracting three-dimensional, geolocated building roof structure representations from non-orthorectified aerial photos, with a view to automate time intensive tasks that are currently handled manually. A two stage framework for 3D roof structure inference from aerial photos is proposed. A transformer-based deep learning framework is used to extract ...
    • "Må vinklene være helt rette?" 

      Samuelsen, Heidi Riise (Mastergradsoppgave; Master thesis, 2024-05-31)
      Denne kvalitative studien tar for seg hindringer elever møter på i utforskende oppgaver. Hensikten med studien har vært å finne ut hvilke hindringer elever møter på og i hvilken fase av utforskningsarbeidet hindringene oppstår. For å undersøke dette har jeg prøvd ut et undervisningsopplegg for elever som tar matematikk 1T. Undervisningsopplegget gikk ut på at elevene selv skulle komme fram ...
    • Antarctic ice shelf response to ocean tides and atmospheric pressure variations using satellite interferometry 

      Odh, Anna (Master thesis; Mastergradsoppgave, 2024-06-02)
      Ice shelves, the floating extensions of the Antarctic ice sheet, are supporting the upstream ice and regulates the outflow into the ocean. They are a key component in future predictions of sea level rise, as their direct contact with both the ocean and the atmosphere makes them subject to changing climatic conditions. This thesis aims to investigate how Fimbulisen, a large ice shelf in East ...
    • Uncertainty Guided Polygon Generation for Building Detection 

      Salomonsen, Christian (Mastergradsoppgave; Master thesis, 2024-06-01)
      Enhanced accuracy of building detection algorithms has the potential to benefit a wide array of applications, including urban planning, environmental monitoring, and disaster response efforts. However, building extraction algorithms struggle with robustness due to among others, occlusions from vegetation and shadows of nearby tall buildings, complex building shapes, and a large distributional shift ...
    • Implementing renewable energy technologies in buildings: impacts of local-specific conditions, intermittency and volatile power markets 

      Anfeltmo, Nikolai Enok (Master thesis; Mastergradsoppgave, 2024-05-31)
      Increased implementations of small-scale renewable energy technologies in buildings can potentially save costs and reduce greenhouse gas emissions. The aim of this thesis is to analyse the total costs and climatic impact of implementations in major cities in Norway. Basing the analysis in data of hourly resolutions captures effects of how intermittency and volatility in the power market ...
    • Seasonal Thermal Energy Storage Using Sand Batteries: Feasibility and Economic Analysis in Northern Norway 

      Strømsør, Audun (Master thesis; Mastergradsoppgave, 2024-05-31)
      The global shift from fossil fuels to renewable energy sources necessitates effective energy storage solutions to address the intermittent nature of renewable power. This thesis investigates the feasibility and economic viability of using sand batteries for seasonal thermal energy storage in Northern Norway. Sand batteries leverage the high heat capacity of sand to store excess thermal energy during ...
    • Assessing ice rate and ice load at Davvi wind farm using WRF model with wind turbine scheme 

      Leonhardsen, Isak (Master thesis; Mastergradsoppgave, 2024-05-31)
      Wind farms located in cold climates are exposed to temperatures under the design limit and icing conditions, where the main challenges are production losses and mechanical failures. The goal of this thesis is to investigate the impact related to icing on the location of Davvi wind farm using Weather Research and Forecasting (WRF) model. The thesis have investigated the icing intensity and production ...
    • Near-surface characterization using shear-wave resonances: A case study from offshore Svalbard, Norway 

      Taweesintananon, Kittinat; Rørstadbotnen, Robin Andre; Landrø, Martin; Johansen, Ståle Emil; Arntsen, Børge; Forwick, Matthias; Hansen, Alfred (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-14)
      Shear-wave (S-wave) resonances are typically observed when the surficial marine sediments over a rock substrate have relatively low S-wave velocities. We observe these phenomena using ocean-bottom fiber-optic distributed acoustic sensing (DAS) in two subsea fiber-optic telecommunication cables in Svalbard, Norway. Strong seismic energy from sufficiently large earthquakes is required to trigger and ...
    • Investigating limitations of RAMMS:Debrisflow as a slushflow simulation tool: Using numerical modelling as a tool to predict slushflow runouts 

      Hansen, Vilde Edvardsen (Master thesis; Mastergradsoppgave, 2024-05-30)
      Slushflows are defined as rapid mass movement and occur when water-saturated snow (slush), rapidly moves downslope as a flowlike process. The high-water content of the flow results in high density and mobility flow that poses a significant danger to everything in its path. To predict how slushflows navigates the terrain, numerical modelling is a valuable tool. The output of the simulations would ...
    • Stellar CCD Photometry in the Auroral Zone 

      Kamben, Robert (Master thesis; Mastergradsoppgave, 2000-12)
      Observing pulsating stars in the auroral zone, seemed for many years to be an impossible task. Due to the aurora, the sky is bright and rapidly changing. Precise photometry could only be performed on stars down to 7 th. magnitude.<p> <p>A new instrument for continuous photometry, with the use of CCD technology, and windowed readout, is developed by the Astrophysics group at the University of ...
    • Geomorphological study of unstable rock slope deformation on Stáluvárri, Kåfjorden, Troms 

      Nypan, Iver Magnarson (Mastergradsoppgave; Master thesis, 2024-05-15)
      Unstable rock slope failures are catastrophic hazards with a long history in Norway. A large portion of these have been detected within Troms County, with a high percentage of them the Lyngenfjorden fault zone. Stáluvárri, a mountain in Kåfjord commune, is such a slope with detected bodies undergoing slow displacement rates. Bedrock compositions on the slope has abundant mica schists, with a thrust ...
    • The origin and evolution of LCT pegmatites in Helgeland, northern Norway: stable isotope evidence from tourmaline (δ11B) and garnet (δ18O, ∆’17O) 

      Schickhoff, Amelie (Master thesis; Mastergradsoppgave, 2024-06-07)
      The processes leading to formation of rare-element enriched granitic pegmatites are controversially debated amongst petrologists and economic geologists. Two contrasting genetic models discuss the necessity of a parental granitic pluton as the magma source versus an anatectic origin via partial melting of metasedimentary rocks. Geochemical tools such as the analysis of stable isotopic compositions ...
    • An Investigation of Turbulence and Intermittency in the High-Latitude Ionosphere: A Multi Case Study 

      Tovås, Sondre (Master thesis; Mastergradsoppgave, 2024-06-03)
      High-latitude electron density irregularities can affect technology such as the Global Navigation Satellite Services (GNSS) by degrading radio signals. These irregularities are not fully understood. In this work we investigate turbulence and intermittency in varying regions of the high- latitude ionosphere using the structure function, empirical flatness and probability density function. Our ...
    • Seasonal and interannual variability in hydrography and currents along the Nansen Legacy transect across the Barents Sea 

      Sortland, Julie Marie Seime (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 

      Aasvold, Jarand Rage (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 

      Garmabaki, Amir Hossein; Kasraei, Ahmad; Barabady, Javad (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 

      Poltronieri, Anna; Bochow, Nils Ole Ronald; Boers, Niklas; Rypdal, Martin Wibe (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 

      Trosten, Daniel Johansen; Løkse, Sigurd Eivindson; Jenssen, Robert; Kampffmeyer, Michael Christian (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 ...