Browsing Faculty of Science and Technology by Title

Now showing items 1970-1989 of 7047

    • Effect of fluid viscosity, lubricity, and fiber on bridging performance of quartz particle. 

      Okeke Ugonna (Master thesis, 2023)
      This master's thesis delves into the investigation of the influential factors that affect the lost circulation material’s bridging performance at a fracture gate. The study begins by examining the quartz particles bridging ...

    • Effect of hydrogen on mechanical properties and fracture of martensitic carbon steel under quenched and tempered conditions 

      Adasooriya, Mudiyan Nirosha Damayanthi; Tucho, Wakshum Mekonnen; Holm, Erlend; Årthun, Terje; Hansen, Vidar; Solheim, Karl Gunnar; Hemmingsen, Tor (Peer reviewed; Journal article, 2020)
      The change in the mechanical properties of tempered high strength carbon steel (AISI 4130) due to hydrogen embrittlement (HE) has been investigated using slow strain rate tensile tests (SSRT). The heat treatment processes ...

    • Effect of Hydrogen on the Mechanical Properties of High Strength Steels 

      Pandey Ankit (Master thesis, 2021)
      The main purpose of this experiment is to compare the mechanical properties of hydrogen charged and uncharged samples. This thesis work started with the machining samples of AISI 1074 rectangular bar into tensile test ...

    • Effect of IFT on gravity segregation in mixed wet reservoir 

      Purwanto, Eko (Masteroppgave/UIS-TN-IPT/2011;, Master thesis, 2011)
      The effects of water-oil interfacial tension (IFT) on gravity segregation and its implication on oil recovery have been investigated by numerical simulations and steady state upscaling. Eclipse surfactant model was used ...

    • Effect of Initial Wettability on Rock Mechanics and Oil Recovery: Comparative Study on Outcrop Chalks 

      Sachdeva, Jaspreet Singh; Nermoen, Anders; Korsnes, Reidar Inge; Madland, Merete Vadla (Peer reviewed; Journal article, 2020)
      Brines containing surface-active divalent ions such as Ca2+, Mg2+ and SO42− impact the stiffness, strength and time-dependent deformation of water wet Mons outcrop chalk. This study documents how stiffness and strength of ...

    • The effect of integral control in oscillatory and chaotic reaction kinetic networks 

      Thorsen, Kristian; Drengstig, Tormod; Ruoff, Peter (Peer reviewed; Journal article, 2019)
      Integral control is ubiquitously used in industrial processes to keep variables robustly regulated at a given setpoint. Integral control is also present in many biological systems where it, implemented through reaction ...

    • Effect of Interactions on the Quantization of the Chiral Photocurrent for Double-Weyl Semimetals 

      Mandal, Ipsita (Peer reviewed; Journal article, 2020-06)
      The circular photogalvanic effect (CPGE) is the photocurrent generated in an optically active material in response to an applied AC electric field, and it changes sign depending on the chirality of the incident circularly ...

    • Effect of Interference Size on Contact Pressure Distribution of Railway Wheel Axle Press Fitting 

      Irena, Kitesa Akewaq; Lemu, Hirpa G.; Kedir, Yahiya Ahmed (Peer reviewed; Journal article, 2023)
      Mechanical couplings in engineering usually use interference fits to connect the shaft and hub. A railway wheel axle is a press fit that is connected by interference and can be subjected to bending stress. In loaded press ...

    • Effect of Iron Oxide Nanoparticles on the Properties of Water-Based Drilling Fluids 

      Alvi, Muhammad Awais Ashfaq; Agonafir, Mesfin Belayneh; Bandyopadhyay, Sulalit; Minde, Mona Wetrhus (Peer reviewed; Journal article, 2020-12)
      In recent years, several studies have indicated the impact of nanoparticles (NPs) on various properties (such as viscosity and fluid loss) of conventional drilling fluids. Our previous study with commercial iron oxide NPs ...

    • The effect of laser surface melting on the retained austenite and wear properties of AISI D2 tool steel 

      Moradiani, Amir; Beiranvand, Zeinab Malekshahi; RATNAYAKE MUDIYANSELAGE, Chandima; Aliabadi, Amir; Rasoulinia, Mehdi (Peer reviewed; Journal article, 2021)
      In this study the effect of laser surface melting (LSM) on the amount of retained austenite, hardness and wear resistance of AISI D2 steel was investigated utilizing hardness test, X-ray diffraction (XRD), pin on disk wear ...

    • Effect of localized corrosion on welded steel joints 

      Hauge, Geir Tuntland (Masteroppgave/UIS-TN-IKM/2015;, Master thesis, 2015-06-15)
      With steel structures placed in ever increasing depths in the oil industry, inspection of the structures are increasingly more challenging. Loss of coating on a weld exposes the weld to a corrosive environment, where the ...

    • The Effect of Lost Circulation Material on Herschel-Bulkley Parameters 

      Sele, Karoline Gjestland; Vrålstad, Jorunn Hamre; Klungtvedt, Karl Ronny; Saasen, Arild (Peer reviewed; Journal article, 2023)
      To hinder loss of drilling fluids into downhole formations while drilling geothermal, CO2 injection or petroleum wells, Lost Circulation Material (LCM) is added to the drilling fluids. These materials consist of many ...

    • Effect of low temperature and municipal wastewater organic loading on anaerobic granule reactor performance 

      Safitri, Anissa Sukma; Kaster, Krista Michelle; Kommedal, Roald (Peer reviewed; Journal article, 2022)
      Biogas production and municipal wastewater COD removal at low temperatures by granulated anaerobic biomass were investigated. Two anaerobic granule reactors were operated continuously for 1025 days by stepwise increase of ...

    • Effect of low temperature on hydrocarbon biodegradation in marine environments 

      Bagi, Andrea (PhD thesis UiS;199, Doctoral thesis, 2013-06-20)
      Understanding the fate of oil discharges in cold marine environments has become a key issue as oil and gas industry is expandig exploration activities into frontier regions such as the Arctic Ocean. The aim of this research ...

    • Effect of Lubrication on Friction in Bending under Tension Test-Experimental and Numerical Approach 

      Trzepiecinski, Thomasz; Lemu, Hirpa G. (Peer reviewed; Journal article, 2020)
      This paper is aimed to determine the value of coefficient of friction (COF) at the rounded edge of the die in the sheet metal forming operations using the bending under tension (BUT) test. The experimental part of the ...

    • Effect of metformin and phenformin in acute myeloid leukemia cell lines MOLM-13 and HL-60 

      Mercado, Louelia (Masteroppgave/UIS-TN-IKBM/2020;, Master thesis, 2020-07)
      Cancer is a large group of diseases and a second leading cause of death globally with an estimated 9.6 million death in 2018 according to World Health Organization (WHO). It is an abnormal and uncontrollably growth of cells ...

    • Effect of Micro Silica on Alkali Activated Repair Mortar 

      Shamsolketabi, Alimohammad (Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020-07-14)
      In this era, concrete acts as a primary role in construction technology. Therefore, it is essential to pay widespread attention to the side effects of concrete products for the environment. On the other hand, the vulnerability ...

    • The effect of mission duration on LISA science objectives 

      Amaro Seoane, Pau; Arca Sedda, Manuel; Babak, Stanislav; Berry, Christopher P. L.; Berti, Emanuele; Bertone, Gianfranco; Blas, Diego; Bogdanović, Tamara; Bonetti, Matteo; Breivik, Katelyn; Brito, Richard; Caldwell, Robert; Capelo, Pedro R.; Caprini, Chiara; Cardoso, Vitor; Carson, Zack; Chen, Hsin-Yu; Chua, Alvin J. K.; Dvorkin, Irina; Haiman, Zoltan; Heisenberg, Lavinia; Isi, Maximiliano; Karnesis, Nikolaos; Kavanagh, Bradley J.; Littenberg, Tyson B.; Mangiagli, Alberto; Marcoccia, Paolo; Maselli, Andrea; Nardini, Germano; Pani, Paolo; Peloso, Marco; Pieroni, Mauro; Ricciardone, Angelo; Sesana, Alberto; Tamanini, Nicola; Toubiana, Alexandre; Valiante, Rosa; Vretinaris, Stamatis; Weir, David J.; Yagi, Kent; Zimmerman, Aaron (Peer reviewed; Journal article, 2022)
      The science objectives of the LISA mission have been defined under the implicit assumption of a 4-years continuous data stream. Based on the performance of LISA Pathfinder, it is now expected that LISA will have a duty ...

    • Effect of MWCNT on Duovis biopolymer based laboratory drilling: Experimental and Simulation studies 

      Riise, Christian Erevik (Masteroppgave/UIS-TN-IEP/2018;, Master thesis, 2018-06-15)
      In recent years, nanotechnology have shown an improving performance on the properties of drilling fluid, enhanced oil recovery and in cement. The technology is proven in several other industries. However, the research ...

    • Effect of Nano Additives on Friction in a Bentonite Water Based System 

      Forthun, Shirin Charlotte (Masteroppgave/UIS-TN-IPT/2016;, Master thesis, 2016-06-13)
      This thesis will present relevant literature study and theory for the experimental and simulation parts. Several water based drilling fluids containing high and low concentrations of TiN, MoS2 and Graphene in nano-size ...