Fakultet for naturvitenskap og teknologi: Recent submissions
Now showing items 401-420 of 4870
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ScopeSense: An 8.5-Month Sport, Nutrition, and Lifestyle Lifelogging Dataset
(Chapter; Bokkapittel, 2023-03-29)Nowadays, most people have a smartphone that can track their everyday activities. Furthermore, a significant number of people wear advanced smartwatches to track several vital biomarkers in addition to activity data. However, it is still unclear how these data can actually be used to improve certain aspects of people’s lives. One of the key challenges is that the collected data is often massive and ... -
Capturing Nutrition Data for Sports: Challenges and Ethical Issues
(Chapter; Bokkapittel, 2023)Nutrition plays a key role in an athlete’s performance, health, and mental well-being. Capturing nutrition data is crucial for analyzing those relations and performing necessary interventions. Using traditional methods to capture long-term nutritional data requires intensive labor, and is prone to errors and biases. Artificial Intelligence (AI) methods can be used to remedy such problems by using ... -
Centre for ice, Cryosphere, Carbon and Climate (iC3)- closing large scale uncertainty in Polar ice sheet impacts on the global carbon cycle
(Conference object; Konferansebidrag, 2023-08)Recently funded for 10 years by the Research Council of Norway centres of excellence scheme, iC3 aims to fill a major research gap in polar science by quantifying the future impact of ice sheet change on Earth’s carbon cycle over policy-relevant timescales. It will achieve this by uniting complementary expertise at UiT The Arctic University of Norway, the Norwegian Polar Institute and a network of ... -
Enhancing Decision-making in the Electric Power Sector with Machine Learning and Optimization
(Doctoral thesis; Doktorgradsavhandling, 2023-10-23)<p>The electric power system infrastructure is essential for modern economies and societies, as it provides the electricity needed to power homes, businesses, and industries. It is of critical importance that the operation of the electric power system is optimized to serve the electricity demand reliably and sustainably. Advances in machine learning and optimization have enabled the potential to ... -
Assimilation of high-resolution ice charts in a coupled ocean-sea-ice model
(Journal article; Tidsskriftartikkel, 2019)In this study, we show assimilation results from a coupled ocean sea-ice model. The model has a horizontal resolution of 2.5 km. In the assimilation system, we assimilate high-resolution ice charts, structured on a 1 km grid. We compare the assimilation of passive microwave observations with the assimilation of ice charts. It is shown that the ice charts have a larger impact on the assimilation ... -
Benthic foraminiferal investigations in Middle to Late Quaternary sections of Kongsfjordhallet, north-west Svalbard
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-29)Stratigraphic sites in north-west Svalbard record at least six significant glacial advances in the last 200 Ky, and sediments deposited under locally high relative sea level during intervening interstadials or interglacials contain abundant benthic foraminifera. We present a biostratigraphic record from the Kongsfjordhallet site in the Kongsfjorden area that covers five high relative sea-level events ... -
Image analysis and segmentation of polar mesospheric summer echoes
(Conference object; Konferansebidrag, 2022-07) -
Auxiliary Network: Scalable and agile online learning for dynamic system with inconsistently available inputs
(Journal article; Tidsskriftartikkel, 2022-04-13)Streaming classification methods assume the number of input features is fixed and always received. But in many real-world scenarios, some features are reliable while others are unreliable or inconsistent. We propose a novel online deep learning-based model called Auxiliary Network (Aux-Net), which is scalable and agile and can handle any number of inputs at each time instance. The Aux-Net model is ... -
Mapping and characterization of unstable slopes with Sentinel-1 multi-geometry InSAR (activity line 2: public sector applications)
(Research report; Forskningsrapport, 2020)This is a high-level report that summarizes the main achievements and results of the research and development conducted in the project “Mapping and Characterization of unstable slopes with Sentinel-1 multi-geometry InSAR (activity line 2: public sector applications)”, where multi-geometry Sentinel-1 Synthetic Aperture Radar Interferometry (InSAR) is used for improving characterization of unstable ... -
Emergency management competence needs: Education and training for key emergency management personnel in a maritime Arctic environment MARPART2-(MAN), Project Report 2
(Research report; Forskningsrapport, 2020)This report focuses on competence demands among key management personnel responsible for maritime emergency response. The report has a special focus on competence challenges related to operations in an Arctic environment. -
A multi-source-to-sink system in a dynamic plate tectonic setting: the Cenozoic of the Barents Sea, Norwegian Arctic
(Conference object; Konferansebidrag, 2022)<p>When multiple source areas are located on a continuously moving plate margin relative to a sink, the signal propagation in the source-to-sink system may vary significantly in time and space. How fast and severe the impact of tectonics and climate is on sediment erosiontransfer-deposition in this dynamic setting is still not well understood. Similarly, how do we quantify the relative sediment ... -
Underexplored continental shelf gateways: timing, mechanisms and role of SW Barents Sea Gateway, Norwegian Arctic
(Conference object; Konferansebidrag, 2022)Ocean gateways connecting ocean basins are crucial for water and heat circulation, which influence global temperature, climate evolution and sediment distribution. While deep-water gateways have been a major research focus by the community, very little attention has been drawn to shallower gateways located on the continental shelves, where such circulation also takes place. In this study, we investigate ... -
Sediment source-to-sink analysis in the Norwegian Arctic
(Conference object; Konferansebidrag, 2022) -
Structured Illumination Microscopy of Biological Structures
(Conference object; Konferansebidrag, 2018)<p>Resolution in optical microscopy has long been limited to the Abbe diffraction limit, i.e. about 250 nm laterally for visible wavelengths on a very good microscope. In the last two decades several techniques have been devised to circumvent this limit: an achievement which was recognized with the 2014 Nobel Prize in Chemistry. Structured Illumination Microscopy (SIM) was the first of these techniques ... -
Design and Optimizing the Sea-Spray Collector using CFD
(Conference object; Konferansebidrag, 2022)Sea-spray contributes significantly to marine icing, posing a severe challenge to marine operations in cold regions. There are two parts to spray icing, i) amount of water impingement on marine structure, ii) thermodynamics/heat transfer governing the fraction of spray that freezes and adheres to the structure. Sea-spray collection provides means to investigate into marine icing phenomenon. In this ... -
Stress Constraints From Shear-Wave Analysis in Shallow Sediments at an Actively Seeping Pockmark on the W-Svalbard Margin
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-28)Mechanisms related to sub-seabed fluid flow processes are complex and inadequately understood. Petrophysical properties, availability of gases, topography, stress directions, and various geological parameters determine the location and intensity of leakage which change over time. From tens of seafloor pockmarks mapped along Vestnesa Ridge on the west-Svalbard margin, only six show persistent present-day ... -
Observing Oil Releases from Platforms Using Synthetic Aperture Radar
(Conference object; Konferansebidrag, 2018)Synthetic aperture radar (SAR) is used for operational surveillance of ocean areas and oil spill detection. Oil spills are frequently detected around oil platforms due to the releases of so-called produced water (PW), which is water containing low concentrations of oil that can form surface slicks similar to other oil spills. PW releases are legal within given limits. Understanding the signatures ... -
Sykdomsbyrde som følge av luftforurensning i Oslo
(Research report; Forskningsrapport, 2016)Arbeidet i denne rapporten er et oppdrag fra Statens vegvesen i forbindelse med revisjon av verdsetting av luftkvalitet. Oppdraget var å bidra til at helsevirkninger av luftforurensning i større grad kan inkluderes i fremtidig økonomisk verdsetting av luftforurensning. Folkehelseinstituttet (FHI) har gjennomført beregninger av sykdomsbyrde som følge av luftforurensning i Oslo. Estimater på for tidlige ... -
Flystøy og luftforurensning ved flyplasser: Mulige helsekonsekvenser ved Oslo lufthavn
(Research report; Forskningsrapport, 2017)Denne rapporten er skrevet på oppdrag fra Ullensaker kommune. Som vertskap for Norges hovedflyplass Oslo lufthavn (OSL) ønsket kommunen oppdatert vitenskapelig kunnskap om mulige virkninger på befolkningens helse og trivsel av de støynivåene man har i nærområdet til flyplassen. Kommunen ønsket også en vurdering av mulig luftforurensning ved flyplassen, og hva som kan være helsemessige konsekvenser ... -
Implications of transient methane flux on associated biological communities in high-arctic seep habitats, Storbanken, Norwegian Barents sea
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-21)The continental margins of the Arctic Ocean basin contain methane seeps, where transient fluxes of seafloor methane are released due to the thermal dissociation of gas hydrates. An increase in shallow methane seeps identified over the past decade, potentially due to enhanced warming of the Arctic Ocean bottom water and associated destabilization of hydrate structure. Biological communities associated ...