Faculty of Science and Technology: Recent submissions
Now showing items 1321-1340 of 7365
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Using Artificial Neural Networks to Gather Intelligence on a Fully Operational Heat Pump System in an Existing Building Cluster
(Peer reviewed; Journal article, 2023)The use of heat pumps for heating and cooling of buildings is increasing, offering an efficient and eco-friendly thermal energy supply. However, their complexity and system integration require attention to detail, and minor ... -
Utilizing students' feedback to ensure quality in teaching and learning: A lesson from covid-19
(Peer reviewed; Journal article, 2023)In this article we investigate the impact of COVID-19 on teaching quality and student active teaching. The data used for the analysis is from more than 4,000 students at the University of Stavanger, collected for the Study ... -
Rice Fields, Mountains and the Invisible Meatification of Korean Agriculture
(Chapter, 2023)A trip through the South Korean countryside means passing through landscapes dominated by rice fields and tree-covered mountains. This landscape, and the farmers working the land, represents a kind of national authenticity ... -
High-Performance Kinetic Hydrate Inhibition with Poly(N-isopropyl methacrylamide) and Triisopentylamine Oxide─Surprising Concentration-Dependent Results
(Peer reviewed; Journal article, 2023)Kinetic hydrate inhibitors (KHIs) are mostly used to prevent the deposition of gas hydrates in gas and condensate production flow lines. The main component in a KHI formulation is a water-soluble polymer, blended with ... -
CrossTransUnet: A new computationally inexpensive tumor segmentation model for brain MRI
(Peer reviewed; Journal article, 2023)Brain tumors are usually fatal diseases with low life expectancies due to the organs they affect, even if the tumors are benign. Diagnosis and treatment of these tumors are challenging tasks, even for experienced physicians ... -
Salting-Out Assisted Liquid-Liquid Extraction for UPLC-MS/MS Determination of Thyroxine and Steroid Hormones in Human Serum and Fish Plasma
(Peer reviewed; Journal article, 2023)Measuring the level of steroid and thyroxine hormones is key to understanding organism health conditions. Liquid chromatography coupled with tandem mass spectrometry has become the method of choice for such hormone analyses ... -
A Privacy-Preserving and Transparent Certification System for Digital Credentials
(Peer reviewed; Journal article, 2023)A certification system is responsible for issuing digital credentials, which attest claims about a subject, e.g., an academic diploma. Such credentials are valuable for individuals and society, and widespread adoption ... -
Families of Proper Holomorphic Embeddings and Carleman-Type Theorem with parameters
(Peer reviewed; Journal article, 2023)We solve the problem of simultaneously embedding properly holomorphically into C2 a whole family of n-connected domains Omega_r in P1 such that none of the components of P1 \ Omega_r reduces to a point, by constructing a ... -
Development of a novel experimental technique for the measurement of residual wall layer thickness in water-oil displacement flows
(Peer reviewed; Journal article, 2023)The effective removal and displacement of fluids is important in many industrial and environmental applications, such as for operation and cleaning of process equipment, fluid injection in porous media for oil recovery or ... -
Holistic management of a smart city thermal energy plant with sewage heat pumps, solar heating, and grey water recycling
(Peer reviewed; Journal article, 2023)This article introduces a modern thermal energy plant consisting of sewage heat pumps, a biogas boiler, thermal solar collectors, and grey water recycling. It further discusses advanced methods to achieve energy efficiency ... -
Is capture-based aquaculture viable? The case of Atlantic cod in Norway
(Peer reviewed; Journal article, 2023)Capture-based aquaculture (CBA) is an important branch of the aquaculture industry that differs from closed cycle farming in that the stocking material consists of captured wild fish or other aquatic organisms. By skipping ... -
Effect of different source terms and inflow direction in atmospheric boundary modeling over the complex terrain site of Perdigão
(Peer reviewed; Journal article, 2023)Assessing wind conditions in complex terrain requires computational fluid dynamics (CFD) simulations incorporating an accurate parameterization of forest canopy effects and Coriolis effects. This study investigates how ... -
Analysis of Thermomechanical Cracks of Disc Brake Used in Heavy Trucks
(Peer reviewed; Journal article, 2022)In the present work, the study of fatigue failure of the disc brake of Volvo truck under thermomechanical effects across the disc thickness is reported. Both analytical and numerical approaches have been used. In the ... -
Wind-induced response of an offshore wind turbine under non-neutral conditions: A comparison with Hywind Scotland
(Peer reviewed; Journal article, 2022)In this study, aeroelastic simulations of a 5 MW spar wind turbine are performed by using simulated wind fields that are representative of surface layer marine atmospheric turbulence under different atmospheric stratifications. ... -
Community resilience – Systems and approaches in remote settlements
(Peer reviewed; Journal article, 2022)This paper explores community resilience to climate-related disasters in the Arctic using the example of a tsunami event in the Uummannaq fjord systems. In 2017 the fjord experienced an avalanche-induced tsunami that ... -
Retarding mechanism of Zn2+ species in geopolymer material using Raman spectroscopy and DFT calculations
(Peer reviewed; Journal article, 2022)Geopolymers are the most promising alternative to Ordinary Portland Cement for oil-well cementing and well abandonment. To that end, the slurry needs a required pumping time ensured by the addition of retarders. Although ... -
Mechanical property characterization of water hyacinth and glass fiber reinforced hybrid composite
(Peer reviewed; Journal article, 2022)While composites of natural fibers have got more attraction because of their advantages, there are some limitations. Therefore, hybridization is a way to minimize some of the limitations of natural fibers composite. This ... -
Adaptive machine learning-based surrogate modeling to accelerate PDE-constrained optimization in enhanced oil recovery
(Peer reviewed; Journal article, 2022)In this contribution, we develop an efficient surrogate modeling framework for simulation-based optimization of enhanced oil recovery, where we particularly focus on polymer flooding. The computational approach is based ... -
Minimization of Surface Roughness and Temperature during Turning of Aluminum 6061 Using Response Surface Methodology and Desirability Function Analysis
(Peer reviewed; Journal article, 2022)Aluminum alloy is the second most abundant metal on Earth, known for its wide range of utilization in commercial goods due to its heat capacity and tensile strength. This study examines the effect of nose radius on the ... -
Evaluation of guidance provided by international standards on metrics and timelines for run-life estimation of oil and gas equipment
(Peer reviewed; Journal article, 2022)Run-life is a concept used in the oil and gas industry to express time to failure for running equipment. When estimating this as part of reliability engineering activities, different metrics and time periods are considered. ...