Now showing items 21-40 of 919

    • Running out of excuses? Norwegian political and policy discourses justifying oil and gas development in the Arctic 

      Ballo, Bjørn Moen; Kristoffersen, Berit; Sidortsov, Roman (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-08)
      In this article, we analyse how energy security are woven into political discourses among Norwegian policymakers after the Russian invasion of Ukraine and the consequences of this for intergenerational justice and environmental concerns more broadly. Preceding justifications centred on state revenue and domestic economic growth, the current discourse focuses on the European need for security of ...
    • Electrical stunning and killing of lumpfish with commercial waterbath and dry stunners 

      van de Vis, Hans; Reimert, Henny; Grimsbø, Endre; Gerritzen, Marien; Foss, Atle; Roth, Bjørn (Research report; Forskningsrapport, 2024-02-12)
      Lumpfish, ranging in size from 146-4200 g, were placed in an electric dry stunning unit head first and exposed to 50 Hz, 240 V AC for 0.5 or 1 s and thereafter 4.5 or 9 s of electricity, thus 5 and 10 s respectively. In seawater, lumpfish were exposed to an electric field equivalent of 4.6 Vrms/cm, 100 pps square AC, with 15% duty cycle for 1 s and thereafter 9 s. This to verify whether the animal ...
    • Enhancing AI Systems through Representative Dataset, Transfer Learning, and Embedded Vision 

      Patil, Ravindra Rajaram (Doctoral thesis; Doktorgradsavhandling, 2024-02-28)
      <p>Artificial intelligence (AI) encompasses a range of techniques that enable machines to perceive, learn, and make intelligent decisions and it has emerged as transformative technology in many applications. This thesis presents the development of an AI model, focusing on the significance of the primary representative dataset and the effectiveness of transfer learning and fine-tuning techniques for ...
    • Stabilization of Non-Cooperative Satellites in Low Earth Orbits using Inter-Satellite Atmospheric Drag 

      Oland, Espen; Kristiansen, Raymond (Chapter; Bokkapittel, 2023-08-07)
      This paper presents a novel solution to the problem of stabilization of non-cooperative satellites in low Earth orbits, which utilizes inter-satellite aerodynamic drag effects for generation of aerodynamics moments in the wake of a controlled satellite. Hence, by altering the position of a smaller controlled satellite, we are able to change the wake region and thus provide aerodynamic moments for ...
    • Havforskningsinstituttets rådgivning for menneskeskapt støy i havet - Kunnskapsgrunnlag, vurderinger og råd for 2024 

      Forland, Tonje Nesse; Sivle, Lise Doksæter; de Jong, Karen; Pedersen, Geir; Strømme, Marte Louise; Kutti, Tina; Durif, Caroline; McQueen, Kate; Grimsbø, Endre; Wehde, Henning (Research report; Forskningsrapport, 2023)
      Havforskningsinstituttet gir råd for alle operasjoner til havs som involverer bruk av lydkilder, samt elektromagnetiske kilder som kan påvirke marine økosystemer. Dette inkluderer vitenskapelige undersøkelser, utbygging og sprenging i sjø, seismiske og elektromagnetiske undersøkelser i forbindelse med petroleumsvirksomhet , og utbygging og drift av vindkraftanlegg til havs. Denne rapporten er en ...
    • A Method for Determining Optimal Charging Infrastructures in Public Ferry Transportation Networks 

      Kristensen, Joachim (Master thesis; Mastergradsoppgave, 2023-05-15)
      In this thesis, we establish the theoretical foundation for determining the minimum requirements for charging infrastructures in networks where electric ferries operate on a fixed schedule. The problem - named the Multiple-Trip Electric Charging Station Placement (MT-ECSP) - is formulated as a 0-1 Integer Program, and is subsequently proven to be NP-hard. We construct several instances of the ...
    • Same same, but different – or how construction informatics gets taught at universities in Norway and Sweden 

      Merschbrock, Christoph; Onstein, Erling; Danielsen, Peter E.; Johansson, Peter (Chapter; Bokkapittel, 2023)
      In response to the increasing demand for construction informatics (CI) expertise, universities in the Nordic countries have developed new educational offers. This study explores how CI related education is being delivered by three different universities, two in Norway and one in Sweden. By comparing curricula and interviewing CI teachers, this paper contributes to the recent debate on the international ...
    • Preface 

      Soleiman Fallah, Arash; Khawaja, Hassan Abbas; Moatamedi, Mojtaba (Chapter; Bokkapittel, 2024-01-18)
      In the ever-advancing realm of renewable energy, wind turbines have unfurled as magnificent guardians, capturing the boundless energy of the wind to lead us toward a cleaner, greener future. Within this captivating landscape, we proudly unveil “Multiphysics of Wind Turbines in Extreme Loading Conditions.” This book is concerned with one aspect of wind turbines which is deal-ing with multiphysics ...
    • Under Seawater Capacitive Power Transfer for Maritime Charging Applications 

      Al-Sallami, Hussein Mahdi Yaseen; Hattori, Reiji; Hoff, Bjarte; Østrem, Trond (Chapter; Bokkapittel, 2023-09-12)
      Underwater capacitive power transfer (CPT) can provide an inexpensive and light electric charging solution with good misalignment tolerance for unmanned maritime vehicles. This paper investigates the effect of the changing of the frequency and the distance on the power transfer and overall efficiency of the underwater CPT system, considering the dielectric losses of the medium. It also proposes and ...
    • Ice shedding from wind turbines 

      Khawaja, Hassan Abbas; Xue, Hui; Eidesen, Hans-Kristian; Andleeb, Zahra; Moatamedi, Mojtaba (Chapter; Bokkapittel, 2024)
      Wind power is an excellent source of renewable energy in areas with sufficient wind resources. Usually, the best locations for wind turbines are on the tops of hills and ridges, where there are lower temperatures [1]. Cold temperatures are responsible for novel challenges [2, 3]. Due to cold climatic conditions, turbine blades are subjected to icing [4]. A number of methods have been proposed and ...
    • Multiphysics modeling of wind turbines 

      Soleiman Fallah, Arash; Khawaja, Hassan Abbas; Moatamedi, Mojtaba (Chapter; Bokkapittel, 2024)
      According toThe International SocietyofMultiphysics (“Definition— MULTIPHYSICS”),multiphysics (sometimes spelledasmulti-physics) is defined as a coupled modeling approach of studies that demands simultaneous addressing of hitherto separate physical disciplines and combining them to generate relational mathematical models and validate them with controlled experiments to enhance the understanding of ...
    • Home Load Disaggregation using Deep Learning and Bayesian Optimization: A Case Study in Arctic Climate in Northern Norway 

      Kianpoor, Nasrin; Hoff, Bjarte; Østrem, Trond (Chapter; Bokkapittel, 2023-08-03)
      Load monitoring is an essential task in energy management systems. In this paper, an approach that relies on a long short-term memory (LSTM) model and a discrete wavelet transform (DWT) filter is presented to estimate the energy usage of flexible appliances. In the preprocessing stage, the main features of the aggregated power signal are extracted using DWT. Deep learning methods are very sensitive ...
    • Classification of bulk cargo types stored openly at ports using CNN 

      Koirala, Madhu; Ellingsen, Pål Gunnar; Ådland, Roar Os (Chapter; Bokkapittel, 2023-10-20)
      In this paper, we present a novel concept of tracking cargoes at open ports using remote sensing images and convolution neural network (CNN) to classify various dry bulk commodities. The dataset used is prepared using Sentinel-2 atmospherically corrected (Sentinel-2 L2A) images covering 12 spectral bands. There are total 4995 labeled and geo-referenced images for four different cargoes-bauxite, coal, ...
    • A Readiness Model for Facilitating the Implementation of Metal Additive Manufacturing at SMEs 

      Sæterbø, Mathias; Solvang, Wei Deng (Chapter; Bokkapittel, 2023-05-23)
      SMEs constitute the backbone of the global economy possessing a vital role in future economic prosperity. Today, with the increasing competition due to globalization of markets and mass customization, as well as the increasing focus on green shift and sustainability, the need to take advantage of new technological innovations has never been more prominent. Metal Additive Manufacturing (MAM) is one ...
    • Customizing Smart Warehouse Management for Large Scale Production Industries 

      Khan, Natalia Batool; Solvang, Wei Deng; Yu, Hao (Chapter; Bokkapittel, 2023-05-23)
      Rapid changes in the level of digitalization have changed manufacturing and production industries during our lifetime. Several industries have explored the extent to which these changes can be utilized to optimize supply chain processes and increase sustainability – they have achieved success in implementation. The energy industry, being one of the world’s largest and most financially consuming ...
    • Digital Controller Design and Implementation for AC and DC Side of 3ph qZSI 

      Agrawal, Shwetank; Tyagi, Barjeev; Kumar, Vishal; Sharma, Pawan (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-28)
      This article presents the multi-loop digital controller design of a quasi-z-source inverter (qZSI). The qZSI is a single-stage power converter and can operate in buck and boost modes. The qZSI is an economical solution for distributed generation and eliminates the need for two-stage power conversion. This article proposes a detailed step-wise digital controller design using a multi-loop control ...
    • pH-dependent endocytosis mechanisms for influenza A and SARS-coronavirus 

      Aganovic, Amar (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-10)
      The ongoing SARS-CoV-2 pandemic and the influenza epidemics have revived the interest in understanding how these highly contagious enveloped viruses respond to alterations in the physicochemical properties of their microenvironment. By understanding the mechanisms and conditions by which viruses exploit the pH environment of the host cell during endocytosis, we can gain a better understanding ...
    • Irregular luggage classification experiments using data from Tromsø airport 

      Jansson, Andreas Dyrøy; Bremdal, Bernt Arild; Remman, Espen (Chapter; Bokkapittel, 2023-09-22)
      This paper examines the current state-of-the-art in object tracking and detection in the context of baggage handling systems using a variety of technologies, with special interest in image classification. Data collection at Tromsø Airport using simple and inexpensive equipment in order to capture images of different types of luggage will be described. Furthermore, a selection of three relevant ...
    • Towards automatic generation of image recognition models for industrial robot arms 

      Arnarson, Halldor; Bremdal, Bernt Arild; Hanssen, Magnus Fredheim (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-10-12)
      As the world moves towards mass customization, there is a need for a manufacturing system that can quickly adapt to market changes. Reconfigurable manufacturing systems (RMS) have been proposed as a solution. RMS is designed to be modular with a high degree of flexibility. However, such a structure creates a lot of complexity. For instance, if the modules are moved or changed, the robot arms in the ...
    • Predicting Peak Prices in the Current Day-Ahead Market 

      Bremdal, Bernt Arild; Dadman, Shayan (Chapter; Bokkapittel, 2023-06)
      The work presented has studied price developments in the day-ahead market. The statistical properties inherent in the time series constituting the day-to-day prices have been investigated. It is shown that these properties are radically different in 2022 than former years and resemble more chance like properties for which make predicting future peak prices especially hard. To overcome this, a space ...