Faculty of Science and Technology: Nye registreringer
Viser treff 1321-1340 av 7358
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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. ... -
Comparison of Lost Circulation Material Sealing Effectiveness in Water-Based and Oil-Based Drilling Fluids and Under Conditions of Mechanical Shear and High Differential Pressures
(Peer reviewed; Journal article, 2022)A study was conducted to assess the performance of granular and fibrous lost circulation materials as preventative treatments and in remedial treatment of lost circulation in water-based and oil-based drilling fluids. For ... -
Improving Data Availability in Decentralized Storage Systems
(PhD thesis UiS;, Doctoral thesis, 2023)Preserving knowledge for future generations has been a primary concern for humanity since the dawn of civilization. State-of-the-art methods have included stone carvings, papyrus scrolls, and paper books. With each advance ... -
Advances in Solar PV Systems; A Comprehensive Review of PV Performance, Influencing Factors, and Mitigation Techniques
(Peer reviewed; Journal article, 2022)PV power plants utilizing solar energy to generate electricity on a large scale has become a trend and a new option that has been adopted by many countries; however, in actuality, it is difficult to anticipate how much ... -
A Hydrogen-Fueled Micro Gas Turbine Unit for Carbon-Free Heat and Power Generation
(Peer reviewed; Journal article, 2022)The energy transition with transformation into predominantly renewable sources requires technology development to secure power production at all times, despite the intermittent nature of the renewables. Micro gas turbines ... -
A numerical study of density-unstable reverse circulation displacement for primary cementing
(Peer reviewed; Journal article, 2022)Primary cementing of the casing string is the operation where the annular space behind the casing is displaced to a cement slurry. Once hardened, the cement should form a solid annular barrier and provide zonal isolation ... -
Effect of temperatures on anaerobic granulated biofilm modelling
(Peer reviewed; Journal article, 2022)Anaerobic granulated biomass-based treatment is a sustainable alternative for municipal wastewater treatment. Each granule in the system is comprised of a complex community of anaerobic microorganisms embedded in a biofilm ... -
Novel reliability method validation for offshore structural dynamic response
(Peer reviewed; Journal article, 2022)The paper validates novel structural reliability Gaidai-Fu-Xing (GFX) method, particularly suitable for multi-dimensional structural responses, versus well established bivariate statistical method, that is known to accurately ...