Now showing items 81-100 of 922

    • Impact of Inverter Based Resources on System Stability in Low Inertia Power System Network 

      Zafar Raja, Hasnain (Master thesis; Mastergradsoppgave, 2023-05-20)
      Inverter-based resources (IBRs), such as solar and wind power are gaining popularity because of their increasing acceptance, environmental benefits and decreasing costs. However, their integration into power systems can lead to significant impacts on system inertia and frequency stability, which are crucial for maintaining the reliability of the power grid. In traditional power systems, the synchronous ...
    • Time Series Forecasting of Reactive Power Support from Smart Converters in SDN Using Machine Learning 

      Aziz, Mujtaba (Master thesis; Mastergradsoppgave, 2023-05-19)
      The climate changes in the last few years created a major need to integrate more renewable energy sources and other low-carbon technologies into the power system network. This causes to face more changes in the power system network, which are particularly visible in distribution power networks. A higher penetration of the distributed energy resources, installed at low- voltage and or medium-voltage ...
    • Hypotese verifisering av tilslagstype innflytelse på CMOD av fiber betong. 

      Klausen, Richard-Mathias (Master thesis; Mastergradsoppgave, 2023-05-15)
      Tilsetting av fiber i betong har vært noe som lenge har vært benyttet for å tilføre strekkegneskaper i betongen og hindre blant annet riss i betongen. Det har i de siste årene vært et ønske om å undersøke om det er forsvarlig å bruke fiber betong i bærende konstruksjoner, og ikke kun i fundamenter og sprøytebetong som fiber har normalt sett vært benyttet til. Etter publiseringen av NB.38 i 2020 har ...
    • Konseptløsning for klimaskjerming på Jernvassdammen 

      Hjallar, Ingrid Evita Antonsen (Master thesis; Mastergradsoppgave, 2023-05-15)
      Denne oppgaven har utforsket konseptet om å bygge en klimaskjerm rundt Jernvassdammen i Nord-Norge, med integrerte solcellepaneler som en del av skjermen. Motivasjonene bak dette konseptet er å skape en «vinn-vinn situasjon» der både dammens fysiske integritet og bærekraftige energiproduksjon blir fremmet. Oppgaven har evaluert tilstanden til Jernvassdammen og funnet at selv om betongkonstruksjonen ...
    • Estimating the Available Energy Flexibility A case study of Helgeland 

      Klæboe, Johanne Holst (Master thesis; Mastergradsoppgave, 2023-05-14)
      This thesis project was commissioned by Cegal and aimed to investigate the potential for demand-side flexibility in the Helgeland region, as well as evaluate forecasting methods for a demand-response system. The future energy situation in the area was analyzed, while the experimental part investigated forecasting methods which can be applied in a demand-response system. Finally, the project i ...
    • Durability of low carbon concrete verified by various curing conditions for freeze-thaw testing 

      Husby, Martin-André Stormdalshei (Master thesis; Mastergradsoppgave, 2023-05-15)
      This study investigated the feasibility of producing low carbon concrete (LCC) using supplementary cementitious materials (SCMs) and evaluated their impact on concrete F-T durability. Variations in the curing conditions were done to see the effect it had on the F-T resistance. These results were then supported by compressive- and chloride migration testing. The performance of different concrete ...
    • Visual SLAM Approach with a Low-Power Remote Robot Agent 

      Jakobsen, Stian Endrè (Master thesis; Mastergradsoppgave, 2023-05-15)
      This master’s thesis examines the viability of using a low-performance, low- power-consumption remote robot agent to collect sensor data for use in a vSLAM system. Selections for the components of the robot agent were made based on results from a small initial study, the robot was assembled, and software to run it was created. A remote server application was created to communicate with the robot ...
    • Evaluering Interface betingelsen, randkraver og samt frysning/melting front ved fasesendring material i hus-kompositt-veggen, basert på eksperiment temperatur data 

      Ji, Yiran (Master thesis; Mastergradsoppgave, 2023-05-14)
      Effektiv bruk energi i et hus/bygg er en drivende utvikling i byggenæring i de siste år. Det er en komplisert-omfang-og sammensatt problem for byggteknologi. For nevnt noe problemstiller, hvordan/hvilken energi kilde som elektrisk, fjernvarme, sol-, vind- som dekker huse behov og samt ha en gunstig effekt på natur, kostnad, og samfunnsforhold. Og, hvordan får vi optimal/gunstig fordeling energi i ...
    • Modelling and simulation of interaction forces in tugboat-assisted docking of large marine vessels 

      Kristiansen, Raymond; Ørke, Henning; Gravdahl, Jan Tommy (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-22)
      In this paper, we address modelling and simulation of dynamics involved in docking of large marine vessels with aid of tugboats, with the aim of providing a tool for improved design of control algorithms for autonomous docking operations. Mathematical models of the docking vessel and tugboats in 3DOF are derived, with a special focus on realistic interactions through towline, contact and friction ...
    • A two-component nonlinear variational wave system 

      Nordli, Anders Samuelsen; Aursand, Peder Kristian (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-14)
      We derive a novel two-component generalization of the nonlinear variational wave equation as a model for the director field of a nematic liquid crystal with a variable order parameter. The equation admits classical solutions locally in time. We prove that a special semilinear case is globally well-posed. We show that a particular long time asymptotic expansion around a constant state in a moving ...
    • Electrical stunning and killing of Atlantic salmon 

      van de Vis, Hans; Reinert, Henny; Grimsbø, Endre; Roth, Bjørn (Research report; Forskningsrapport, 2023)
      Atlantic salmon (Salmo salar) at various size 226-1938 g were placed in electric dry stunning either tailor head- first and then exposed to 50 Hz, 240 V AC for 0.5 and thereafter 9.5 s of electricity. This to verify whether the animal is rendered unconscious prior to killing by immersing the animal into cold brine (-14 to -18 °C) or hypoxic water, supersaturated with CO2. In addition, salmon from ...
    • Towards a Concept for Digitalized Yard Logistics—Outlining the Next-Generation Features 

      Strandhagen, Jo Wessel; Semini, Marco Giovanni; Alfnes, Erlend (Chapter; Bokkapittel, 2023-09-14)
      Yards are industrial sites for production and servicing of ships and offshore maritime installations, such as oil and gas platforms and modules, offshore windmills, and fish farms—all essential products in the maritime industry. Although many yards are performing highly complex and technically advanced production, there is still a need to bring the internal logistics of yards to a corresponding level ...
    • A review of infrared thermography applications for ice detection and mitigation 

      Adeel, Yousuf; Khawaja, Hassan Abbas; Virk, Muhammad Shakeel (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-18)
      Ice accretion on various onshore and offshore infrastructures imparts hazardous effects sometimes beyond repair, which may be life-threatening. Therefore, it has become necessary to look for ways to detect and mitigate ice. Some ice mitigation techniques have been tested or in use in aviation and railway sectors, however, their applicability to other sectors/systems is still in the research phase. ...
    • Intelligent self- and reconfigurable manufacturing system 

      Arnarson, Halldor (Doctoral thesis; Doktorgradsavhandling, 2023-12-12)
      Over the past few years, the market has shifted away from mass production towards mass customization and personalized production. This shift has made it necessary for manufacturing companies to change their manufacturing line more frequently, which can be both expensive and time-consuming. To overcome this challenge, reconfigurable manufacturing systems (RMS) have been proposed as a solution. However, ...
    • Optimization of ground icing protection for aircraft: Snow endurance tests, rheological analysis and thermography of anti-icing fluids 

      Benaissa, Sanae; Momen, Gelareh; Harvey, Derek; Taghavi, Seyed Mohammad; Khawaja, Hassan Abbas (Conference object; Konferansebidrag, 2023-10-11)
    • What is Multiphysics? Definition and Examples 

      Khawaja, Hassan Abbas (Conference object; Konferansebidrag, 2023-11)
    • Collaboration with Chinese Universities and My Research Portfolio 

      Khawaja, Hassan Abbas (Conference object; Konferansebidrag, 2023-11-14)
    • Do We Perform Systematic Literature Review Right? A Scientific Mapping and Methodological Assessment 

      Azarian, Mathew; Yu, Hao; Shiferaw, Asmamaw Tadege; Stevik, Tor Kristian (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-27)
      Background: Systematic literature review (SLR) is increasingly utilized to maximize the element of rigor and minimize the individual bias of research synthesis. An analysis of the Web of Science (WoS) database indicates that 90% of the literature review studies using SLR have been published between 2012 and 2022. However, this progressive agenda is impaired by the lack of methodological consistency ...
    • MCSINC. Summarising the main findings of work package 1: Demands and requirements for machine sensing infrastructure. 

      Venæs, Janne; Sande, André Bekkevold; Tangrand, Kristoffer Meyer; Seter, Hanne; Arnesen, Petter (Research report; Forskningsrapport, 2023)
      The main objective of the MCSINC project is to identify the opportunities and challenges with Al-based machine vision of road infrastructure under Nordic conditions. Work package 1 focuses specifically on "Demands and requirements for machine sensing infrastructure". This project report summarises the work done in work package 1 in the MCSINC-project: a state of the art on machine sensing under ...