• Fisheries acoustics and Acoustic Target Classification - Report from the COGMAR/CRIMAC workshop on machine learning methods in fisheries acoustics 

      Handegard, Nils Olav; Andersen, Lars Nonboe; Brautaset, Olav; Choi, Changkyu; Eliassen, Inge Kristian; Heggelund, Yngve; Hestnes, Arne Johan; Malde, Ketil; Osland, Håkon; Ordonez, Alba; Patel, Ruben; Pedersen, Geir; Umar, Ibrahim; Engeland, Tom Van; Vatnehol, Sindre (Rapport fra havforskningen, Research report, 2021)
      This report documents a workshop organised by the COGMAR and CRIMAC projects. The objective of the workshop was twofold. The first objective was to give an overview of ongoing work using machine learning for Acoustic Target ...
    • Flow behavior of thermo-thickening associative polymers in porous media: effects of associative content, salinity, time, velocity, and temperature 

      Åsen, Siv Marie; Stavland, Arne; Strand, Daniel (Journal article; Peer reviewed, 2022)
      Above a critical temperature, thermo-thickening associative polymers (TAPs) have a superior ability to decrease the mobility of the water phase, compared to traditional polymers for enhanced oil recovery. The ability to ...
    • Fluid Migration Characterization of Full-scale Annulus Cement Sections Using Pressure-Pulse-Decay Measurements 

      Skadsem, Hans Joakim (Peer reviewed; Journal article, 2021)
      Fluid migration behind casings is a well integrity problem that can result in sustained casing pressure, undetected leaks to the environment, and potentially very challenging remediation attempts. Understanding the geometric ...
    • Forecasting Piston Rod Seal Failure Based on Acoustic Emission Features in ARIMA Model 

      Pedersen, Jørgen Fone; Schlanbusch, Rune; Shanbhag, Vignesh Vishnudas (Peer reviewed; Journal article, 2022)
      Fluid leakage due to piston rod seal failure in hydraulic cylinders results in unscheduled maintenance, machine downtime and loss of productivity. Therefore, it is vital to understand the piston rod seal failure at initial ...
    • Formulating the history matching problem with consistent error statistics 

      Evensen, Geir (Peer reviewed; Journal article, 2021)
      It is common to formulate the history-matching problem using Bayes’ theorem. From Bayes’, the conditional probability density function (pdf) of the uncertain model parameters is proportional to the prior pdf of the model ...
    • Forstudie Sirkulære muligheter i Sauda og Suldal 

      Meland, Kjersti V.; Kleinegris, Dorinde Mechtilde Meike; Enerstvedt, Anna Kraaijeveld; Fromreide, Mads (Research report, 2023)
      Denne forstudien har undersøkt potensialet for utvikling av nye vekstnæringer ved å tilrettelegge for sirkulært og bioøkonomisk samarbeid i Sauda og Suldal. Forstudien har kartlagt ressurs- og sidestrømmer til en gruppe ...
    • Framework for effective robust design of building energy systems: Bridging the gap between predicted and actual energy use 

      Kocbach, Jan Martin; Folgerø, Kjetil; Skålvik, Astrid Marie; Olsen Wulff, Maria; Kjellberg, Bianca Karolina; Harsem, Trond Thorgeir (Peer reviewed; Journal article, 2022)
      Practitioners working on building performance simulations do seldom apply uncertainty and sensitivity analysis using state-of-the-art global methods in their daily workflow. With stricter building regulations imposed year ...
    • Framework for forward modelling of the DigiMon data 

      Vandeweijer, Vincent; Paap, Bob; Candela, Thibault; Bhakta, Tuhin; Lien, Martha (ACT DigiMon (NORCE);D2.1, Research report, 2021)
      Deliverable D2.1 adds to the main goal of WP2 of the ACT DigiMon project, which is to develop the integrated DigiMon system. The key target for WP2 is to optimally integrate various system components into a reliable and ...
    • From outcrop scanlines to discrete fracture networks, an integrative workflow 

      Lepillier, Baptiste; Bruna, Pierre-Olivier; Bruhn, David; Bastesen, Eivind; Daniilidis, Alexandros; Garcia, Óscar; Torabi, Anita; Wheeler, Walter H (Journal article; Peer reviewed, 2020)
      Understanding fractures and fracture networks is essential for the investigation and use of subsurface reservoirs. The aim is to predict the fractures and the fracture network when there is no direct access to subsurface ...
    • Fuzzy Gain-Scheduling PID for UAV Position and Altitude Controllers 

      Melo, Aurelio G.; Andrade, Fabio Augusto de Alcantara; Guedes, Ihannah P.; Carvalho, Guilherme F.; Zachi, Alessandro R. L.; Pinto, Milena F. (Peer reviewed; Journal article, 2022)
      Unmanned aerial vehicle (UAV) applications have evolved to a wide range of fields in the last decade. One of the main challenges in autonomous tasks is the UAV stability during maneuvers. Thus, attitude and position control ...
    • Geocellular rendering of cave surveys in paleokarst reservoir models 

      Lønøy, Bjarte; Tveranger, Jan; Pennos, Christos; Whitaker, Fiona; Lauritzen, Stein-Erik (Peer reviewed; Journal article, 2020)
      Infilled and collapsed cave systems are an important component of many paleokarst reservoirs. Incorporating these features into industrial reservoir models commonly relies on geostatistical modelling methods that often ...
    • Geologi, jordsmonn og botaniske undersøkelser på Lisle Lyngøy (delrapport 1) 

      Bastesen, Eivind; Andersen, Gidske Leknæs (Research report, 2023)
      Lisle Lyngøya ligger i nordspissen av Øygarden kommune, som geologisk sett er en del av den norske strandflaten. Strandflaten er karakterisert av nederodert lavland, og strekker seg langs hele norskekysten med unntak av ...
    • Great expectations: Migrant parents and parent-school cooperation in Norway 

      Bendixsen, Synnøve Kristine Nepstad; Danielsen, Hilde (Peer reviewed; Journal article, 2020)
      One long-standing characteristic of schools in Norway is inclusive education as a primary goal. The last years, the Norwegian government has emphasised increased parent-school cooperation as a way to limit risks, i.e. of ...
    • Guideline Societal Embeddedness Assessment 

      Geerdink, Tara; Sprenkeling, Marit; Slob, Adriaan; Puts, Hanneke (DigiMon ACT2 (NORCE);D3.1, Research report, 2020)
      The Societal Embeddedness Level (SEL) is a novel methodology which provides insight in the societal requirements for a technological innovation to be deployed. It contributes to the realization of technological innovations ...
    • Harmony Phase 0/A 

      Johnsen, Harald (Research report, 2019)
      This technical note provides some general considerations on the geophysical requirements of the Harmony L2 Ocean products and their implications to the mission requirements. Section 2 gives an overview of the geophysical ...
    • Health Indicator for Low-speed Axial Bearings using Variational Autoencoders 

      Hemmer, Martin; Klausen, Andreas; Huynh, Khang; Robbersmyr, Kjell Gunnar; Waag, Tor Inge (Peer reviewed; Journal article, 2020)
      This paper proposes a method for calculating a health indicator (HI) for low-speed axial rolling element bearing (REB) health assessment by utilizing the latent representation obtained by variational inference using ...
    • Hierarchical Representation Learning in Graph Neural Networks with Node Decimation Pooling 

      Bianchi, Filippo Maria; Grattarola, Daniele; Livi, Lorenzo; Alippi, Cesare (Peer reviewed; Journal article, 2020)
      Abstract—In graph neural networks (GNNs), pooling operators compute local summaries of input graphs to capture their global properties, and they are fundamental for building deep GNNs that learn hierarchical representations. ...
    • Homotopy scattering series for seismic forward modelling with variable density and velocity 

      Xiang, Kui; Eikrem, Kjersti Solberg; Jakobsen, Morten; Nævdal, Geir (Peer reviewed; Journal article, 2021)
      We have derived a convergent scattering series solution for the frequency-domain wave equation in acoustic media with variable density and velocity. The convergent scattering series solution is based on the homotopy analysis ...
    • Hybrid Iterative Ensemble Smoother for History Matching of Hierarchical Models 

      Oliver, Dean (Peer reviewed; Journal article, 2022)
      The choice of a prior model can have a large impact on the ability to assimilate data. In standard applications of ensemble-based data assimilation, all realizations in the initial ensemble are generated from the same ...
    • HYDROGEN POWERED VESSELS AT SEA:FUEL CELL & BATTERY UPSCALING 

      Helleland, Christer; Iversen, Fionn; Halstensen, Svein Olav (Chapter, 2022)
      There is today a strong effort in developing fuel cell / battery systems for ship propulsion to achieve zero-emission maritime transport, in accordance with UN sustainability goals and the Fit For 55 plan to achieve the ...