Nye registreringer

  • Combined Use of Aerial Photogrammetry and Terrestrial Laser Scanning for Detecting Geomorphological Changes in Hornsund, Svalbard 

    Błaszczyk, Małgorzata; Laska, Michał; Sivertsen, Agnar Holten; Jawak, Shridhar D. (Peer reviewed; Journal article, 2022)
    The Arctic is a region undergoing continuous and significant changes in land relief due to different glaciological, geomorphological and hydrogeological processes. To study those phenomena, digital elevation models (DEMs) ...
  • Attention integrated hierarchical networks for no-reference image quality assessment 

    You, Junyong; Korhonen, Jari (Peer reviewed; Journal article, 2022)
    Quality assessment of natural images is influenced by perceptual mechanisms, e.g., attention and contrast sensitivity, and quality perception can be generated in a hierarchical process. This paper proposes an architecture ...
  • Comprehensive Direct Georeferencing of Aerial Images for Unmanned Aerial Systems Applications 

    Correia, Carlos A. M.; Andrade, Fabio Augusto de Alcantara; Sivertsen, Agnar Holten; Guedes, Ihannah Pinto; Pinto, Milena Faria; Manhães, Aline Gesualdi; Haddad, Diego Barreto (Peer reviewed; Journal article, 2022)
    Optical image sensors are the most common remote sensing data acquisition devices present in Unmanned Aerial Systems (UAS). In this context, assigning a location in a geographic frame of reference to the acquired image is ...
  • Iterative multilevel assimilation of inverted seismic data 

    Nezhadali, Mohammad; Bhakta, Tuhin; Fossum, Kristian; Mannseth, Trond (Peer reviewed; Journal article, 2022)
    In ensemble-based data assimilation (DA), the ensemble size is usually limited to around one hundred. Straightforward application of ensemble-based DA can therefore result in significant Monte Carlo errors, often manifesting ...
  • 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 ...
  • Assessment of calibrated Sentinel-1 OCN RVL products 

    Johnsen, Harald (Research report, 2022)
    The accuracy and precision of the calibrated DC frequency of S1 WV and IW acquisitions are assessed using data acquired over both land and ocean areas. Data from the period of 1st of May 2019 until 30th of April 2020 are ...
  • A Finite-Volume-Based Module for Unsaturated Poroelasticity 

    Varela, Jhabriel; Gasda, Sarah Eileen; Keilegavlen, Eirik; Nordbotten, Jan Martin (Chapter, 2021)
    In this chapter, we present fv-unsat, a multipoint finite-volume–based solver for unsaturated flow in deformable and nondeformable porous media. The latter is described using the mixed form of Richards’ equation, whereas ...
  • Vibration-assisted annular fluid displacement for rig-less well abandonment operations 

    Skadsem, Hans Joakim; Giljarhus, Knut Erik Teigen; Øijordsbakken Fredheim, Fiona; van Riet, Egbert; Keultjes, Wout J. G. (Journal article; Peer reviewed, 2022)
    Through-tubing abandonment is the operation where the production tubing is cut or punched and cemented inside the production casing. This can establish a full cross-sectional barrier or isolation in wells where the cement ...
  • 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 ...
  • Surface Complexation Modelling of Wettability Alteration during Carbonated Water Flooding 

    Mehdiyev, Fagan; Erzuah, Samuel; Omekeh, Aruoture Voke; Fjelde, Ingebret (Peer reviewed; Journal article, 2022)
    CO2 capture and utilization is an effective tool in reducing greenhouse gas emissions and hence, combating global warming. In the present study, surface complexation modeling (SCM) with the geochemistry solver, PHREEQ-C, ...
  • Automatic length estimation of free-swimming fish using an underwater 3D range-gated camera 

    Risholm, Petter; Mohammed, Ahmed Kedir; Kirkhus, Trine; Clausen, Sigmund; Vasilyev, Leonid; Folkedal, Ole; Johnsen, Øistein; Haugholt, Karl Henrik; Thielemann, Jens T (Peer reviewed; Journal article, 2022)
    Camera estimation of fish size in aquaculture production and fisheries is crucial for enabling knowledge-based decision making. Automatic estimation of fish lengths on an individual and population basis are key steps to ...
  • Dynamic estimates of extreme-case CO2 storage capacity for basin-scale heterogeneous systems under geological uncertainty 

    Pettersson, Per; Tveit, Svenn; Gasda, Sarah Eileen (Peer reviewed; Journal article, 2022)
    Geological CO2 storage is expected to grow dramatically in the coming decades to meet global climate targets. Assessment of worldwide storage resources using static methods indicates significant theoretical potential for ...
  • V3Geo: A cloud-based repository for virtual 3D models in geoscience 

    Buckley, Simon John; Howell, John Anthony; Naumann, Nicole; Lewis, Conor; Chmielewska, Magda; Ringdal, Kari; Vanbiervliet, Joris; Tong, Bowei; Mulelid-Tynes, Oliver S.; Foster, Dylan; Maxwell, Gail; Pugsley, Jessica (Peer reviewed; Journal article, 2022)
    V3Geo is a cloud-based repository for publishing virtual 3D models in geoscience. The system allows storage, search and visualisation of mesh models typically acquired using techniques such as photogrammetry and laser ...
  • Dynamic PVT model for CO2-EOR black-oil simulations 

    Sandve, Tor Harald; Sævareid, Ove; Aavatsmark, Ivar (Peer reviewed; Journal article, 2022)
    A well-planned CO2EOR operation can help meet an ever-increasing need for energy and at the same time reduce the total CO2 footprint from the energy production. Good simulation studies are crucial for investment decisions ...
  • Ensemble-Based Well-Log Interpretation and Uncertainty Quantification for Well Geosteering 

    Jahani, Nazanin; Ambia Garrido, Joaquin; Alyaev, Sergey; Fossum, Kristian; Suter, Erich Christian; Torres-Verdin, Carlos (Peer reviewed; Journal article, 2022)
    Hydrocarbon reservoirs are often located in spatially complex and uncertain geologic environments, where the associated costs of drilling wells for exploration and development are notoriously high. These costs may be reduced ...
  • Data assimilation with soft constraints (DASC) through a generalized iterative ensemble smoother 

    Luo, Xiaodong; Chalub Cruz, William (Peer reviewed; Journal article, 2022)
    This work investigates an ensemble-based workflow to simultaneously handle generic, nonlinear equality and inequality constraints in reservoir data assimilation problems. The proposed workflow is built upon a recently ...
  • Permafrost in monitored unstable rock slopes in Norway-New insights from temperature and surface velocity measurements, geophysical surveying, and ground temperature modelling 

    Etzelmüller, Bernd; Czekirda, Justyna; Magnin, Florence; Duvillard, Pierre-Allain; Ravanel, Ludovic; Malet, Emanuelle; Aspaas, Andreas Grøvan; Kristensen, Lene; Skrede, Ingrid; Majala, Gudrun D.; Jacobs, Benjamin; Leinauer, Johannes; Hauck, Christian; Hilbich, Christin; Böhme, Martina; Hermanns, Reginald; Eriksen, Harald Øverli; Lauknes, Tom Rune; Krautblatter, Michael; Westermann, Sebastian (Peer reviewed; Journal article, 2022)
    The warming and subsequent degradation of mountain permafrost within alpine areas represent an important process influencing the stability of steep slopes and rock faces. The unstable and monitored slopes of Mannen (Møre ...
  • Uncovering Contributing Factors to Interruptions in the Power Grid: An Arctic Case 

    Eikeland, Odin Foldvik; Bianchi, Filippo Maria; Holmestrand, Inga Setså; Bakkejord, Sigurd; Santos, Sergio; Chiesa, Matteo (Peer reviewed; Journal article, 2022)
    Electric failures are a problem for customers and grid operators. Identifying causes and localizing the source of failures in the grid is critical. Here, we focus on a specific power grid in the Arctic region of Northern ...
  • User-centred design of clinical dashboards for guided iCBT 

    Wake, Jo Dugstad; Rabbi, Fazle; Inal, Yavuz; Nordgreen, Tine (Peer reviewed; Journal article, 2022)
    As Internet-based technology spreads to most areas of life, it becomes a challenge to grasp opportunities arising from enormous amounts of data being generated from various sources such as smart homes, smart cities, health ...
  • Probabilistic model-error assessment of deep learning proxies: an application to real-time inversion of borehole electromagnetic measurements 

    Rammay, Muzammil Hussain; Alyaev, Sergey; Elsheikh, Ahmed (Peer reviewed; Journal article, 2022)
    The advent of fast sensing technologies allow for real-time model updates in many applications where the model parameters are uncertain. Once the observations are collected, Bayesian algorithms offer a pathway for real-time ...

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