Now showing items 8041-8060 of 36288

    • A-CHAIM: Near-Real-Time Data Assimilation of the High Latitude Ionosphere With a Particle Filter 

      Reid, Ben; Themens, David R.; McCaffrey, A; Jayachandran, P.T.; Johnsen, Magnar Gullikstad; Ulich, Thomas (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-28)
      The Assimilative Canadian High Arctic Ionospheric Model (A-CHAIM) is an operational ionospheric data assimilation model that provides a 3D representation of the high latitude ionosphere in Near-Real-Time (NRT). A-CHAIM uses low-latency observations of slant Total Electron Content (sTEC) from ground-based Global Navigation Satellite System (GNSS) receivers, ionosondes, and vertical TEC from ...
    • Raman-spectroscopy and of optically trapped nanoparticles 

      Mikheev, Ivan (Mastergradsoppgave; Master thesis, 2022-11-06)
      The present work begins a large layer of experiments on the study of Raman radiation from extracellular vesicles. It is a promising method that provides unique information about the global biomolecular composition of a single vesicle or a small number of vesicles. Two physical phenomena are present in this work, Raman scattering and optical trapping. In Raman scattering, the scattered radiation ...
    • HgCl2 addition to pore water samples from cold seeps can affect the geochemistry of dissolved inorganic carbon ([DIC], δ13CDIC) 

      Argentino, Claudio; Kalenitchenko, Dimitri; Lindgren, Johan Matteus; Panieri, Giuliana (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-03)
      The conventional use of mercuric chloride (HgCl<sub>2</sub>) as an antimicrobial agent in water samples for dissolved inorganic carbon (DIC) analysis poses health and environmental risks related to its handling and disposal. Even though there is an increasing interest in quantifying pore water DIC contribution to the ocean carbon cycle and deep-sea acidification, the paucity of comparative studies ...
    • Widespread natural methane and oil leakage from sub-marine Arctic reservoirs 

      Serov, Pavel; Mattingsdal, Rune; Winsborrow, Monica; Patton, Henry; Andreassen, Karin Marie (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-30)
      Parceling the anthropogenic and natural (geological) sources of fossil methane in the atmosphere remains problematic due to a lack of distinctive chemical markers for their discrimination. In this light, understanding the distribution and contribution of potential geological methane sources is important. Here we present empirical observations of hitherto undocumented, widespread and extensive methane ...
    • The effect of muscovite on the microstructural evolution and rheology of quartzite in general shear 

      Tokle, L.; Hirth, G.; Stunitz, Holger (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-13)
      We conducted general shear experiments on synthetic mixtures of quartz and muscovite aggregates at 800 °C and 1.5 GPa with 0.1 wt% H<sub>2</sub>O added in the Griggs apparatus to investigate the role of muscovite content on the microstructural evolution and rheological properties of quartz aggregates. Muscovite content varied between 0, 5, 10 and 25% muscovite. Mechanically, the sample strengths ...
    • Co-products from the Atlantic salmon filleting industry – Their properties, stability and potential as human food ingredients 

      Ulleberg, Didrik; Sletten, Ingrid Bøe; Jakobsen, Anita Nordeng; Svenning, Jon Brage; Lerfall, Jørgen (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-20)
      The present study impacts the growing knowledge about co-products obtained from the primary processing of Atlantic salmon (Salmo Salar L.) as food ingredients by highlighting their microbial and chemical composition and stability. The proximate composition varied between the co-products from the fatty belly-flap (34% lipid, 15% protein) to the leaner deboned meat (10% fat, 22% protein) (p < 0.001), ...
    • Sensitivity Analysis of Thermal Degradation of Plastic Waste Using Statistically Assumed Exponential Factors and Activation Energies 

      Un Nabi, Rao Adeel; Hussain, Hammad; Naz, Yasin; Shukrullah, Shazia; Khawaja, Hassan; Irfan, Muhammad; Rahman, Saifur; Jazem Ghanim, Abdulnour Ali (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-04)
      The rise in the production of plastic waste has prompted the exploration of various recovery options instead of landfilling, burning, and other unethical ways of decomposing. The experimentally generated rate constants for the thermal processing of plastic waste do not yield enough liquid fuels and gases for commercial-scale usage. It is imperative to predict kinetic rate constants statistically ...
    • Implications of Regurgitative Feeding on Plastic Loads in Northern Fulmars (Fulmarus glacialis): A Study from Svalbard 

      Tulatz, Felix; Gabrielsen, Geir Wing; Bourgeon, Sophie; Herzke, Dorte; Krapp, Rupert; Langset, Magdalene; Neumann, Svenja; Lippold, Anna; Collard, France (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-22)
      Procellariiform seabirds like northern fulmars (Fulmarus glacialis) are prone to ingest and accumulate floating plastic pieces. In the North Sea region, there is a long tradition to use beached fulmars as biomonitors for marine plastic pollution. Monitoring data revealed consistently lower plastic burdens in adult fulmars compared to younger age classes. Those findings were hypothesized to partly ...
    • Diagnostic accuracy of heart auscultation for detecting valve disease: a systematic review 

      Davidsen, Anne Herefoss; Andersen, Stian; Halvorsen, Peder Andreas; Schirmer, Henrik; Reierth, Eirik; Melbye, Hasse (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-24)
      Objective The objective of this study was to determine the diagnostic accuracy in detecting valvular heart disease (VHD) by heart auscultation, performed by medical doctors.<p> <p>Design/methods A systematic literature search for diagnostic studies comparing heart auscultation to echocardiography or angiography, to evaluate VHD in adults, was performed in MEDLINE (1947–November 2021) and ...
    • Diagnostiske PET-radiofarmaka i Norge - klinisk bruk og utvikling 

      Johansen, Kurt Jonny (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-23)
      Utviklingen av undersøkelses- og behandlingsmetoder innen nukleærmedisinsk positronemisjonstomografi (PET) har økt i omfang og kompleksitet.<p> <p>Bruken av PET-radiofarmaka har økt og blitt mer spesifikt rettet mot ulike sykdomstilstander.<p> <p>Målsetningen med denne artikkelen er å gi en oversikt over bruk og utvikling av bildediagnostisk PET-radiofarmaka i Norge.
    • Effect of Vitamin D Supplementation on Psoriasis Severity in Patients With Lower-Range Serum 25-Hydroxyvitamin D Levels A Randomized Clinical Trial 

      Jenssen, Marita; Furberg, Anne-Sofie; Jorde, Rolf; Wilsgaard, Tom; Danielsen, Kjersti (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-29)
      Importance - Topical vitamin D analogues are routine treatment for psoriasis, but the effect of oral supplementation has not been established.<p> <p>Objective - To examine the effect of vitamin D supplementation on psoriasis severity throughout the winter.<p> <p>Design, Setting, and Participants - This randomized, double-blind placebo-controlled clinical trial with 2 parallel groups was performed ...
    • Life-cycle analysis of an endangered migratory goose to assess the impact ofconservation actions on population recovery 

      Marolla, Filippo; Aarvak, Tomas; Hamel, Sandra; Ims, Rolf Anker; Kéry, Marc; Mellard, Jarad; Nater, Chloé Rebecca; Schaub, Michael; Vougioukalou, Manolia; Yoccoz, Nigel; Øien, Ingar Jostein (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-29)
      Evaluating the effectiveness of conservation actions is challenging for migratory species because a population can be impacted anywhere along its route. Conservation actions for the critically endangered Fennoscandian lesser white-fronted goose population include culling of red foxes in the breeding area and habitat improvements and reduction of illegal hunting in the non-breeding areas. One goal ...
    • Concise Definition of the Overcurrent Protection System for CIGRE European Medium Voltage Benchmark Network 

      Pham, Le Nam Hai; Wagle, Raju; Gonzalez-Longatt, Francisco (Chapter; Bokkapittel, 2023-03-28)
      In the significant widespread transition towards clean energies, there has been an unstoppable trend in integrating renewable energy sources (RSs) in distribution networks. However, the massive penetration of integrated multisources into conventional distribution systems may create several operational problems, such as malfunctioning protection systems. This paper concisely defines the setting for ...
    • The teacher’s role for engagement in foraging and gardening activities in kindergarten 

      Bergan, Veronica; Nylund, Maritha Berger; Midtbø, Ida Lervik; Paulsen, Bård Henry Landsem (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-17)
      Early childhood education provides an important arena for fostering valuable habits and practices for sustainability. This paper contributes to understanding the educator’s role within early childhood environmental education in foraging and gardening practices. What pedagogical approaches does the teacher provide to foster the children’s participation, engagement, and learning in such activities? ...
    • Being and becoming ‘a frail older adult’: Meaning-making and resistance through storytelling 

      Bjerkmo, Lena Yvonne; Helgesen, Ann Karin; Blix, Bodil Hansen (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-10)
      By inquiring into older adults' narrations about their lives in the present, past, and future, this study aims to learn more about home-dwelling older adults' lived experiences of being and becoming “frail”. This article is based on a dialogical narrative analysis of interviews with three home-dwelling older adults identified as frail by the home care services. We conducted a series of three interviews ...
    • Forensic drug screening by liquid chromatography hyphenated with high-resolution mass spectrometry (LC-HRMS) 

      Heinsvig, Pia; Noble, Carolina; Dalsgaard, Petur; Mardal, Marie (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-15)
      Liquid chromatography-high resolution mass spectrometry (LC-HRMS) has been widely used for screening small organic molecules in complex samples. Its selectivity and sensitivity allow for broad-scope screening of thousands of analytes. However, the complexity of the acquired data has complicated its implementation in high-throughput laboratories that analyze hundreds of samples per week and require ...
    • Scalable Analysis of Untargeted LC-HRMS Data by Means of SQL Database Archiving 

      Mardal, Marie; Dalsgaard, Petur W.; Rasmussen, Brian S.; Linnet, Kristian; Mollerup, Christian B. (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-20)
      Liquid chromatography-high-resolution mass spectrometry (LC-HRMS) is widely used to detect chemicals with a broad range of physiochemical properties in complex biological samples. However, the current data analysis strategies are not sufficiently scalable because of data complexity and amplitude. In this article, we report a novel data analysis strategy for HRMS data founded on structured query ...
    • Multiphysics Simulation of Particle-Surface Interaction and its Effect on Powder Patterns and Process Optimization 

      Siyahhan, Bercan; Boiger, Gernot; Fallah, Arash Soleiman; Khawaja, Hassan; Moatamedi, Mojtaba (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-29)
      In industrial processes, powder coating is widely utilized to attain functional or aesthetic surface properties on manufactured parts. A Eulerian-Lagrangian Multiphysics solver has been developed within the OpenFOAM framework in order to simulate and optimize such processes with regards to coating efficiency and homogeneity. In the scope of this study, the powder particle-substrate and particle-particle ...
    • Indigenous Religions in the Sixth Missionary District: The Case of the Hillsa Drum 

      Storm, Dikka; Fonneland, Trude (Chapter; Bokkapittel, 2022)
      Sámi drums are central in understanding the indigenous religions in earlier Sámi societies.1 The recently reported find of the goavddis (drum) from Hillsá opens for a view into a complex religious world in a period of religious change and transformation. We believe the goavddis is an important object that can help shed light on Sámi cultures in the past and present, as well as contribute to new ...
    • The Witchcraft Trial against Anders Poulsen, Vads  1692: Critical Perspectives 

      Willumsen, Liv Helene (Chapter; Bokkapittel, 2022-03-29)
      In this chapter, I will analyse a historical source that has attracted considerable attention during the last two decades, namely the court records of the trial of Anders Poulsen, 1692.1 The trial took place in the town of Vadsø in Finnmark, which is the northernmost district of Northern Norway. The reasons for this attention are multiple, and a few will be mentioned.