Blar i Faculty of Science and Technology på tittel
Viser treff 3656-3675 av 7254
-
Investigation of New Classes of Amide and Non-amide Kinetic Hydrate Inhibitors
(PhD thesis UiS;538, Doctoral thesis, 2020-09)The formation of gas hydrates can cause pipeline blockage during the transportation of gas and oil products, which is one of the main challenges for flow assurance in the petroleum industry. It is uneasy to remove gas ... -
Investigation of Ring-Openings of Some gem-Dichlorocyclopropanes
(Masteroppgave/UIS-TN-IKBM/2018;, Master thesis, 2018-06-29)The main purpose of this thesis was to study ring-openings of gem-dichlorocyclopropanes under basic conditions and the formation of acetylenic acetals. Therefore, several 2-alkoxy-1,1-dichlorocyclopropanes were synthesized ... -
Investigation of Rotor Efficiency with Varying Rotor Pitch Angle for a Coaxial Drone
(Peer reviewed; Journal article, 2022-04)Coaxial rotor systems are appealing for multirotor drones, as they increase thrust without increasing the vehicle’s footprint. However, the thrust of a coaxial rotor system is reduced compared to having the rotors in line. ... -
An Investigation of Second-Order Finite Volume Methods for Field-scale Reservoir Simulation
(PhD thesis UiS;, Doctoral thesis, 2024)This thesis focuses on improving the accuracy of numerical simulation of flow in subsurface reservoirs by using second-order finite volume methods. The first-order finite volume method, commonly used in reservoir simulation, ... -
Investigation of smoothing in the actuator line model for single and multi-rotor wind turbines
(Master thesis, 2022)The state-of-the-art actuator line modeling (ALM) method has been used extensively in the past decade to perform large-eddy simulations (LES) of wind turbines as fully resolved blade simulations require complex rotating ... -
Investigation of struvite crystallization within a fluidized bed reactor at IVAR SNJ Wastewater treatment plant
(Master thesis, 2023)This study investigates the struvite crystallization method for phosphorus recovery from IVAR SNJ wastewater treatment plant. The physicochemical properties of struvite, including its crystallization mechanics and the ... -
Investigation of suction anchor pullout capacity under undrained conditions
(Masteroppgave/UIS-TN-IKM/2015;, Master thesis, 2015-06-15)Floating units are dependent on reliable mooring systems to ensure safety during marine operations. Suction anchors have proved to be a technologically viable and cost-effective concept. They are capable of precision ... -
An Investigation of Sustained Casing Pressure Occurring on the NCS
(Masteroppgave/UIS-TN-IKM/2017;, Master thesis, 2017-12-15)Reports from the Gulf of Mexico (GoM) show that thousands of wells exhibit sustained casing pressure (SCP), however the extent of this phenomena and its driving factors have yet to be studied in detail on the Norwegian ... -
Investigation of temperature effects on cement bases for shallow gas zone cementing
(Bachelor thesis, 2021)Shallow gas can create challenges for well integrity, local and global environment. During drilling and completion of wells, shallow gas can create dangerous situations resulting to human, environmental and economic ... -
Investigation of temperature- and pressure effects on drilling fluid properties and related downhole torque and drag calculations
(Masteroppgave/UIS-TN-IPT/2016;, Master thesis, 2016-06)Increasing temperature and pressure with depth, affects the properties of drilling fluid. The effect of temperature and pressure on the density and viscosity of drilling fluid is of great importance. This is because, among ... -
Investigation of the Antiscaling Performance of Phosphonated Chitosan for Upstream Petroleum Industry Application
(Peer reviewed; Journal article, 2021)Scale deposition is one of the main water-based production problems in the upstream oil and gas industry. Few environmentally friendly scale inhibitors show good thermal stability as well as calcium compatibility. We report ... -
Investigation of the corrosion properties of 316L in marine atmosphere and assessment of the effectiveness of different surface repassivation products
(Masteroppgave/UIS-TN-IMBM/2018;, Master thesis, 2018)The major purpose of this thesis was to investigate and assess what effect of repassivation product has on corrosion resistance of 316L in marine atmosphere. Additionally, compare the chemical composition with the certificate. ... -
Investigation of the Effect of Fracturing Fluids on Shale Pore Structure by Nuclear Magnetic Resonance
(Peer reviewed; Journal article, 2023)Hydraulic fracturing technology significantly enhances the productivity of shale oil and gas reservoirs. Nonetheless, the infiltration of fracturing fluid into shale formations can detrimentally affect the microscopic pore ... -
An investigation of the effects and consequences of combining Expanding Dual Pin with radial spherical plain bearings
(Peer reviewed; Journal article, 2022)An expanding pin locks the pin assembly to its supports and bearings and prevents any relative movements between the surfaces in contact. In this study, the diameter changes of the bearing inner ring as a function of the ... -
Investigation of the enantioselectivity of acetylcholinesterase and butyrylcholinesterase upon inhibition by tacrine-iminosugar heterodimers
(Peer reviewed; Journal article, 2023-09)The copper-catalysed azide-alkyne cycloaddition was applied to prepare three enantiomeric pairs of heterodimers containing a tacrine residue and a 1,4-dideoxy-1,4-imino-D-arabinitol (DAB) or 1,4-dideoxy-1,4-imino-L-arabinitol ... -
Investigation of the hydraulic integrity of cement plug: Oilwell cementitious materials
(Peer reviewed; Journal article, 2023)The loss of hydraulic integrity in oil and gas wells due to the loss of cement sheath sealability can lead to environmental contamination, annular pressure build-up, and safety threats. In this study, we examine the hydraulic ... -
Investigation of the mechanical properties of Acacia tortilis fiber reinforced natural composite
(Peer reviewed; Journal article, 2020-10)The work presented in this paper is motivated by the fact that use of natural fiber materials for structural and non-structural applications have increased within the last two decades. In addition to the known benefits of ... -
Investigation of the performance of a heat pump that uses CO2 as working fluid.
(Bachelor thesis, 2023)Climate change is one of the greatest challenges facing the world today, and reducing greenhouse gas emissions is a critical part of mitigating its impacts. Conventional residential heat pumps use Hydrofluorocarbons (HFCs) ... -
Investigation of the Physiological Function of Protein Phosphatase 4 (PP4) in Arabidopsis thaliana
(Masteroppgave/UIS-TN-IMN/2016;, Master thesis, 2016-06-14)Protein Phosphatase 4 (PP4), a member of serine/threonine-specific phospho-protein phosphatases (PPP) family, is remarkably well conserved across eukaryotes. PP4 has been studied mainly in yeast and mammalian cells, and ... -
Investigation of the transport mechanism of the cutting transport in drilling horizontal wells using high speed camera and PIV for analysis
(Masteroppgave/UIS-TN-IPT/2017;, Master thesis, 2017-06-15)Dynamical feature of particle dunes is investigated in a horizontal drilling well. Apparently, it is quite challenging to transport the cuttings in horizontal section of the well because the cuttings tend to settle down ...