Nye registreringer

  • Linear codes associated to symmetric determinantal varieties: Even rank case 

    Beelen, Peter; Johnsen, Trygve; Singh, Prasant (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-20)
    We consider linear codes over a finite field Fq, for odd q, derived from determinantal varieties, obtained from symmetric matrices of bounded ranks. A formula for the weight of a codeword is derived. Using this formula, we have computed the minimum distance for the codes corresponding to matrices upperbounded by any fixed, even rank. A conjecture is proposed for the cases where the upper bound is ...
  • Exceptionally simple super-PDE for F (4) 

    Santi, Andrea; The, Dennis (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-01)
    For the largest exceptional simple Lie superalgebra F(4), having dimension (24|16), we provide two explicit geometric realizations as supersymmetries, namely as the symmetry superalgebra of super-PDE systems of second and third order respectively.
  • ODEs whose Symmetry Groups are not Fiber-Preserving 

    Kruglikov, Boris Serafimovich; Schneider, Eivind (Journal article; Tidsskriftartikkel; Peer reviewed, 2023)
    We observe that, up to conjugation, a majority of higher order ODEs (ordinary differential equations) and ODE systems have only fiber-preserving point symmetries. By exploiting Lie's classification of Lie algebras of vector fields, we describe all exceptions to this in the case of scalar ODEs and systems of ODEs on a pair of functions. The scalar ODEs whose symmetry algebras are not fiber preserving ...
  • ProtoVAE: A Trustworthy Self-Explainable Prototypical Variational Model 

    Gautam, Srishti; Boubekki, Ahcene; Hansen, Stine; Salahuddin, Suaiba Amina; Jenssen, Robert; Hohne, Marina Marie-Claire; Kampffmeyer, Michael (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-10-15)
    The need for interpretable models has fostered the development of self-explainable classifiers. Prior approaches are either based on multi-stage optimization schemes, impacting the predictive performance of the model, or produce explanations that are not transparent, trustworthy or do not capture the diversity of the data. To address these shortcomings, we propose ProtoVAE, a variational autoencoder-based ...
  • Assigning the unassigned: A signature-based classification of rDNA metabarcodes reveals new deep-sea diversity 

    Barrenechea Angeles, Inés; Nguyen, Ngoc-Loi; Greco, Mattia; Tan, Koh Siang; Pawlowski, Jan (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-29)
    Environmental DNA metabarcoding reveals a vast genetic diversity of marine eukaryotes. Yet, most of the metabarcoding data remain unassigned due to the paucity of reference databases. This is particularly true for the deep-sea meiofauna and eukaryotic microbiota, whose hidden diversity is largely unexplored. Here, we tackle this issue by using unique DNA signatures to classify unknown metabarcodes ...
  • Towards Interpretable, Trustworthy and Reliable AI 

    Gautam, Srishti (Doctoral thesis; Doktorgradsavhandling, 2024-03-15)
    <p>The field of artificial intelligence recently witnessed remarkable growth, leading to the development of complex deep learning models that perform exceptionally across various domains. However, these developments bring forth critical issues. Deep learning models are vulnerable to inheriting and potentially exacerbating biases present in their training data. Moreover, the complexity of these models ...
  • Synthesis of thiol-appended gold and rhenium corroles as potential nanoconjugants for gold nanoparticles 

    Engedal Johannessen, Krister (Master thesis; Mastergradsoppgave, 2023-06-10)
    Photodynamic therapy (PDT) today is an established treatment for a variety of cancers as well as various dermatological conditions, macular degeneration and bacterial and other infections. Treatment involves the administration of a photosensitizer, typically a porphyrin, followed by irradiation with light. The photoexcited sensitizer transfers its excess energy to oxygen in the affected tissue, ...
  • Investigating the Effect of Pressure and UV Radiation on Antioxidant and UV Stabilizing Additives in Different Tire Particles 

    Johansen, Martin Amund Langaas (Master thesis; Mastergradsoppgave, 2023-05-25)
    This thesis investigates the impact four different experimental marine conditions have on the extractability of tire additives meant to protect tires from UV radiation as well as some other common substances found in tires. The impact is evaluated between tire particle size and age to determine if the exposure affects them differently. This thesis finds that the effect of marine conditions on ...
  • Global change research needs international collaboration 

    Büntgen, Ulf; Rees, William Gareth (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-08-04)
    Tackling the grand challenges of global climate change for the sustainability of ecological and societal systems requires data and expertise from Russia, the world's largest country that has the longest Arctic shoreline and the largest forest biome, peatland and permafrost zones. Academic relations and scientific collaborations with Russian scholars and institutions must continue despite the ensuing ...
  • Scenario Design, Data Measurement, and Analysis Approaches in Maritime Simulator Training: A Systematic Review 

    Munim, Ziaul Haque; Krabbel, Helene Luise Sonna; Haavardtun, Per; Kim, Tae Eun; Bustgaard, Morten; Thorvaldsen, Haakon (Chapter; Bokkapittel, 2023-08-29)
    Developing objective assessment approach in maritime simulator training can be a highly challenging task due to the complexity of simulating realistic scenarios, capturing relevant performance indicators and establishing good assessment protocols. This study provides a synthesis of simulation scenario contexts, data collection tools, and data analysis approaches in published simulator training ...
  • Betydningen av for- og etterarbeid for å fremme faglig forståelse under praktisk kjemiundervisning på ungdomstrinnet 

    Landrø, Jenny (Master thesis; Mastergradsoppgave, 2023-05-30)
    Denne oppgaven er skrevet på bakgrunn av interesse og nysgjerrighet rundt praktiske undervisningsmåter. Oppgaven har som mål å undersøke hvordan ungdomsskolelærere benytter seg av praktiske aktiviteter og for- og etterarbeid for å fremme elevenes faglige forståelse. Studien er utført ved analyse av LISSI-studien sitt videomateriale av norsk naturfagundervisning på ungdomstrinnet. Analysen bestod ...
  • Deep Learning Based Automatic Segmentation of Gas Flares in Single Beam Echo Sounder Data 

    Skotnes, Teodor Lynghaug (Mastergradsoppgave; Master thesis, 2024-01-18)
    This thesis introduces the first study of instance segmentation applied to gas flares in single beam echo sounder data. We develop a comprehensive dataset consisting of 1,414 images, featuring 5,142 segmented objects identified as gas flare. A key contribution is the adaptation of the Brier score specifically for instance segmentation. Further, we show how to adapt the Weighted Box Fusion (WBF) ...
  • Depositional environments and source rock potential of some Upper Palaeozoic (Devonian) coals on Bjørnøya, Western Barents shelf 

    Janocha, Julian; Wesenlund, Fredrik; Thießen, Olaf; Grundvåg, Sten-Andreas; Koehl, Jean-Baptiste Philippe; Johannessen, Erik P. (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-27)
    Upper Palaeozoic strata are potential sources for hydrocarbon plays on the Norwegian Barents Shelf. The island of Bjørnøya (Bear Island) is located on the western margin of the Barents Shelf and represents an exposed part of the Stappen High, which makes it an excellent location to investigate the source rock potential of this succession. Here, we investigate the organic geochemical composition and ...
  • Protracted post-glacial hydrocarbon seepage in the Barents Sea revealed by U–Th dating of seep carbonates 

    Himmler, Tobias; Wagner, Doris; Sahy, Diana; Vadakkepuliyambatta, Sunil; Chand, Shyam; Martma, Tõnu; Kirsimäe, Kalle; Mattingsdal, Rune; Panieri, Giuliana; Bünz, Stefan; Condon, Daniel J.; Knies, Jochen Manfred; Lepland, Aivo (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-01)
    The hydrocarbon seepage chronology during deglaciation across the formerly glaciated Barents Sea was established using uranium-thorium (U–Th) dating of seep carbonates. Seep carbonates were sampled with remotely operated vehicles (ROV) from the seafloor at three active hydrocarbon seeps (water depth 156–383 m), located in the north-west (Storfjordrenna), north-central (Storbanken High), and south-west ...
  • Decomposable (5, 6)-solutions in eleven-dimensional supergravity 

    Chi, Hanci; Chrysikos, Ioannis; Schneider, Eivind (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-08)
    We present decomposable (5, 6)-solutions M<sup>1,4</sup>×M<sup>6</sup> in eleven-dimensional supergravity by solving the bosonic supergravity equations for a variety of non-trivial flux forms. Many of the bosonic backgrounds presented here are induced by various types of null flux forms on products of certain totally Ricci-isotropic Lorentzian Walker manifolds and Ricci-flat Riemannian manifolds. ...
  • Weather-aware Wake-up of Sleeping Cyber-Physical IoT Nodes 

    Kristensen, Steffen Ole Randrup; Bjørndalen, John Markus; Rais, Issam; Ha, Hoai Phuong; Anshus, Otto Johan (Chapter; Bokkapittel, 2023-09-27)
    Cyber-physical IoT nodes located in environments which are resource-constrained and physically hard to access, like the Arctic tundra, must achieve long operational lifetimes from a single battery and report data over data networks. The nodes sleep most of the time, and only wake up to perform mission tasks, including reporting data. However, networks can become unavailable, or have low bandwidth ...
  • Synthetic wavelength scanning interferometry for 3D surface profilometry with extended range of height measurement using multi-colour LED light sources 

    Mann, Priyanka; Dubey, Vishesh Kumar; Ahmad, Azeem; Butola, Ankit; Mehta, Dalip Singh (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-05)
    We report three-dimensional surface profilometry with extended range of height measurements using synthetic wavelength scanning interferometry without tunable filters, wavelength-tuning lasers, grating elements. We have used inexpensive multiple colour light emitting diodes (LEDs) and operate them sequentially one by one or combination of two or more colours simultaneously to visualize synthetic ...
  • D3.3 (M18) - Report on curation in core ELIXIR registries (an ELIXIR Norway ELIXIR3 deliverable) 

    Bösl, Korbinian Michael; Fatima, Nazeefa; Gundersen, Sveinung; Klemetsen, Terje; Petters, Sebastian; Åberg, Espen (Research report; Forskningsrapport, 2023-10-01)
    This report serves as an update on the progress of WP3 Task 3.4 in ELIXIR3, in support of curation efforts on content in repositories of metadata, datasets, tools, training, workflows, and other resources, in line with the ELIXIR Platforms. The report documents progress made, methods used, and plans for the near future as of month 18 of a 48-month timeline. ELIXIR Norway extends support to numerous ...
  • Biological Evaluations, NMR Analyses, Molecular Modeling Studies, and Overview of the Synthesis of the Marine Natural Product (−)-Mucosin 

    Nolsøe, Jens Mortansson Jelstrup; Underhaug, Jarl; Sørskår, Åshild Moi; Antonsen, Simen; Malterud, Karl Egil; Gani, Osman; Fan, Qiong; Hjorth, Marit; Sæther, Thomas; Hansen, Trond Vidar; H. Stenstrøm, Yngve (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-24)
    Natural products obtained from marine organisms continue to be a rich source of novel structural architecture and of importance in drug discovery, medicine, and health. However, the success of such endeavors depends on the exact structural elucidation and access to sufficient material, often by stereoselective total synthesis, of the isolated natural product of interest. (−)-Mucosin (1), a fatty ...
  • Reliability Assessment of Computer in Design Phase Under High Censored Setting 

    Yuan, Fuqing; Lu, Jinmei (Chapter; Bokkapittel, 2023-02-01)
    Assessment of reliability of personal computer is a challenge for the developer as the lack of sufficient data. Ordinary statistical approach depending on large dataset has less convincible result for the developer to make decision. Prior to massive production, the computer manufacturer runs a life test by picking up a certain number of new computers to run to failure to enlarge the data set. ...

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