Recent additions

  • The Mjølnir Impact Crater in the central Barents Sea - a potential hydrocarbon system? 

    Rein, Sindre Arnesen (Master thesis; Mastergradsoppgave, 2020-05-15)
    A meteor impact event on the Bjameland Platform in the Norwegian Barents Sea about 142 ± 2.6 million years ago formed the Mjølnir Impact Crater. The structure has diameter of 40 km impacting the Mesozoic stratigraphy, and has previously been investigated with emphasis on the dynamics of the impact, the structure formation, sedimentation and post-impact tectonics. Impact structures have proven to be ...
  • Improving Chlorophyll-a Estimation from Sentinel-2 (MSI) in the Barents Sea using Machine Learning 

    Asim, Muhammad; Brekke, Camilla; Mahmood, Arif; Eltoft, Torbjørn; Reigstad, Marit (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-22)
    This article addresses methodologies for remote sensing of ocean Chlorophyll-a (Chl-a), with emphasis on the Barents Sea. We aim at improving the monitoring capacity by integrating in situ Chl-a observations and optical remote sensing to locally train machine learning (ML) models. For this purpose, in situ measurements of Chl-a ranging from 0.014–10.81 mg/m <sup>3</sup> , collected for the years ...
  • The pure PV-EV energy system – A conceptual study of a nationwide energy system based solely on photovoltaics and electric vehicles 

    Boström, Tobias; Babar, Bilal; Hansen, Jonas Berg; Good, Clara (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-08)
    The objective of this conceptual study is to reveal the substantial potential and synergy of solar energy and electric vehicles (EVs) working together. This potential is demonstrated by studying the feasibility of a nationwide energy system solely reliant on solar energy and EVs. Photovoltaic (PV) solar energy is already an important energy source globally, but due to its intermittency it requires ...
  • Samhandling og læring i et introduksjonsemne i fysikk basert på digital Peer Instruction 

    Winnberg, Øystein Grøntveit (Master thesis; Mastergradsoppgave, 2021-06-11)
    I de senere år har det vært en skifte mot økt bruk av digitale former for undervisning, og i 2020 ble dette spesielt framskyndet fordi brorparten av undervisningen på universitetsnivå måtte foregå digitalt på grunn av koronapendemien. Det er også voksende interesse for mer studentaktive undervisningsformer for å oppnå bedre læringsutbytte. Dette åpner for nye spørsmål rundt digitale studentaktive ...
  • Engasjement, motivasjon og læringsutbytte i et digitalt Peer Instruction-basert introduksjonsemne i fysikk 

    Lien, Sigurd Eriksen (Mastergradsoppgave; Master thesis, 2021-06-11)
    Året 2020 har vært et år med drastiske endringer i undervisningform med en hurtig overgang til digital undervisning grunnet koronapandemien. Denne studien undersøker studentenes motivasjon, læringsutbytte, deltagelse og tidsbruk ved et introduksjonsemne i fysikk, der undervisningen ble lagt om til digital undervisning med Peer Instruction. Studentens motivasjon ble karakterisert med motivasjonskonstruktene ...
  • Towards Unsupervised Domain Adaptation for Diabetic Retinopathy Detection in the Tromsø Eye Study 

    Størdal, Magnus (Mastergradsoppgave; Master thesis, 2021-05-29)
    Diabetic retinopathy (DR) is an eye disease which affects a third of the diabetic population. It is a preventable disease, but requires early detection for efficient treatment. While there has been increasing interest in applying deep learning techniques for DR detection in order to aid practitioners make more accurate diagnosis, these efforts are mainly focused on datasets that have been collected ...
  • Detecting Unhealthy Comments in Norwegian using BERT 

    Warholm, Joakim (Mastergradsoppgave; Master thesis, 2021-05-28)
    In this work we present a new Norwegian labeled dataset of 7078 comments for unhealthy comment detection. The dataset is used to fine-tune a BERT model, and demonstrates that BERT has the ability to detect subtle forms of toxicity, also in Norwegian. We compare how the different newly released Norwegian BERT models perform when fine-tuned on our dataset, and we also experiment with how English data ...
  • Spectral shaping of ring resonator transmission response 

    Yadav, Mukesh; Noh, Jong Wook; Hjelme, Dag Roar; Aksnes, Astrid (Journal article; Tidsskriftartikkel; Peer reviewed, 2021)
    We present a Mach-Zehnder interferometer assisted ring resonator configuration (MARC) to realize resonator transmission spectra with unique spectral signatures and significantly large effective free spectral ranges. Transmission spectra with unique spectral signatures are generated by changing the angular separation between the through port and the drop port waveguides of the ring resonator (RR). ...
  • Radar imaging with EISCAT 3D 

    Stamm, Johann; Vierinen, Juha; Urco, Juan M.; Gustavsson, Björn; Chau, Jorge L. (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-04)
    A new incoherent scatter radar called EISCAT 3D is being constructed in northern Scandinavia. It will have the capability to produce volumetric images of ionospheric plasma parameters using aperture synthesis radar imaging. This study uses the current design of EISCAT 3D to explore the theoretical radar imaging performance when imaging electron density in the E region and compares numerical techniques ...
  • The Arctic and Africa in China’s Foreign Policy: How Different Are They and What Does This Tell Us? 

    Pursiainen, Christer Henrik; Alden, Chris; Bertelsen, Rasmus Gjedssø (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-08)
    The article discusses China’s policies in and towards the Arctic and Africa within a comparative perspective. To what extent is China’s policy adaptable to different conditions? What does this adaptability tell us about China’s ascendant great-power role in the world in general? What is the message to the Arctic and Africa respectively? The article concludes that China’s regional strategies aptly ...
  • Predicting Energy Demand in Semi-Remote Arctic Locations 

    Foldvik Eikeland, Odin; Bianchi, Filippo Maria; Chiesa, Matteo; Apostoleris, Harry; Hansen, Morten; Chiou, Yu-Cheng (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-03)
    Forecasting energy demand within a distribution network is essential for developing strategies to manage and optimize available energy resources and the associated infrastructure. In this study, we consider remote communities in the Arctic located at the end of the radial distribution network without alternative energy supply. Therefore, it is crucial to develop an accurate forecasting model to ...
  • Chemical Analysis and Anthelmintic Activity Against Teladorsagia Circumcincta of Nordic Bark Extracts In vitro 

    Athanasiadou, Spiridoula; Almvik, Marit; Hellström, Jarkko; Madland, Eva; Simic, Nebojsa; Steinshamn, Håvard (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-04)
    Helminth parasitic infections are common in small ruminants in Norway; infection is usually treated with anthelmintic drugs, but anthelmintic resistance is an increasing problem. It is necessary to identify strategies to reduce the use of anthelmintic drugs and mitigate the impact of anthelmintic resistance. Condensed tannin (CT)-rich forages have been shown to reduce the helminth burden in small ...
  • Up-to-the-Minute Privacy Policies via Gossips in Participatory Epidemiological Studies 

    Sharma, Aakash; Nilsen, Thomas Bye; Czerwinska, Katja P; Onitiu, Daria; Brenna, Lars; Johansen, Dag; Johansen, Håvard D. (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-13)
    Researchers and researched populations are actively involved in participatory epidemiology. Such studies collect many details about an individual. Recent developments in statistical inferences can lead to sensitive information leaks from seemingly insensitive data about individuals. Typical safeguarding mechanisms are vetted by ethics committees; however, the attack models are constantly evolving. ...
  • Oil Spill Behavior and Response in the Arctic. Risk Analysis of Existing Response Methods Applicable for the Arctic Conditions 

    Zhelezniak, Viktoriia (Master thesis; Mastergradsoppgave, 2021-06-01)
    Due to the demand for diversifying and modifying sources of raw materials and trade routes, the Arctic is the region of high interests. Development and carrying out the offshore activities associated with oil and gas industry and maritime transport are growing rapidly in the Arctic. However, an acute problem associated with the development of offshore activities is the ecological consequence caused ...
  • Root Cause Analysis of fire in waste facilities: A case study of Tromsø municipality 

    Kargar, Marjan (Master thesis; Mastergradsoppgave, 2021-06-01)
    The amount of waste produced in Norway has been increased considerably in the past decades as a result of population and economic growth. Therefore, the role of waste management companies in society has become more important. One of the significant challenges in the waste facilities is the fire that occurs regularly and causes various problems for the waste management companies. Several causes can ...
  • MarSpray LiDAR (MSL) for the comprehensive measurement of Sea Spray for Improving the Prediction of Marine Icing in Cold Conditions 

    Dhar, Sushmit (Master thesis; Mastergradsoppgave, 2021-06-01)
    Marine icing is a very complicated phenomenon, and its prediction, evaluation, and estimation involve many uncertainties. Commonly, the most severe ice accretion is caused by sea spray. A substantial amount of study is present on sea spray ice accretion about modelling and numerical simulations with certain assumptions and not based on comprehensive real-time data. The past techniques used to measure ...
  • Arctic region as a new hydrocarbon production area. Technology needs and equipment availability for the development of the Russian Arctic 

    Klimov, Maxim (Master thesis; Mastergradsoppgave, 2021-05-16)
    In this thesis, a number of questions, concerning the present and the future of Russian hydrocarbon policy in the Arctic area are covered, with a description of necessary technologies and main projects that constitute Russian plans for the nearest decade up to 2030 in presence of western technological and financial sanctions, available equipment and potential for localization. The main contribution ...
  • Implementation and Control of an Inverted Pendulum on a Cart 

    Hanekam, Halvard (Master thesis; Mastergradsoppgave, 2021-05-28)
    An Inverted Pendulum on a Cart is a common system often used as a benchmark problem for control systems. The system consists of a cart that can move in one direction on the horizontal plane and a pendulum attached to the cart through a hinge point. The pendulum can rotate 360° on the plane made up of the vertical direction and the direction the cart can move. The system is controlled by applying a ...
  • A Continuous Seismostratigraphic Framework for the Western Svalbard-Barents Sea Margin Over the Last 2.7 Ma: Implications for the Late Cenozoic Glacial History of the Svalbard-Barents Sea Ice Sheet 

    Alexandropoulou, Nikolitsa; Winsborrow, Monica; Andreassen, Karin; Plaza-Faverola, Andreia; Dessandier, Pierre-Antoine; Mattingsdal, Rune; Baeten, Nicole; Knies, Jochen (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-14)
    Here we present a high-resolution, continuous seismostratigraphic framework that for the first time, connects the over 1,000 km long western Svalbard-Barents Sea margin and covers the last ∼2.7 million years (Ma). By exploiting recent improvements in chronology, we establish a set of reliable age fix-points from available boreholes along the margin. We then use a large 2-D seismic database to extend ...
  • A new auroral phenomenon, the anti-black aurora 

    Nel, A.E.; Kosch, M.J.; Keith Whiter, Daniel; Gustavsson, Björn Johan; Aslaksen, Torun Helene (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-19)
    Black auroras are small-scale features embedded in the diffuse background aurora, typically occurring post-substorm after magnetic midnight and with an eastward drift imposed. Black auroras show a significant reduction in optical brightness compared to the surrounding diffuse aurora, and can appear as slow-moving arcs or rapidly-moving patches and arc segments. We report, for the first time, an even ...

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