Now showing items 1244-1263 of 1608

    • SAG-FW Welding of C90 Riser Steel Connectors 

      Stoss, Aleksander Rudolf (Master thesis, 2012)
      Weld simulations have been conducted on a C90 quenched tempered steel used in offshore riser systems, in order to investigate the possibility of introducing an effective solid state weld procedure. As a secondary objective, ...
    • Sandblasting effect on performance and durability of Ti based IrO2 –Ta2O5 anode in acidic solutions 

      Xu, Wenting; Haarberg, Geir Martin; Sunde, Svein; Seland, Frode; Ratvik, Arne Petter; Holmin, Susanne; Gustavsson, J; Afvander, Åsa; Zimmerman, Erik; Åkre, Torjus (Journal article; Peer reviewed, 2018)
      The effect of applying sandblasting during pretreatment while preparing titanium based IrO2 – Ta2O5 anodes by the conventional method was investigated. It was observed that sandblasting influences the surface morphology ...
    • Screw Extrusion from various Binary Al-XMg Feed Materials - Effects of Heat Treatment on Microstructure 

      Berulfsen, Tarjei (Master thesis, 2016)
      Three direct chill (DC) cast aluminium-magnesium (Al-Mg) alloys, with 5, 8, and 10 wt% magnesium, have been used as base materials. These base materials were either rapidly solidified by melt spinning, or granulated by ...
    • Screw Extrusion of Light Metals: Development of materials, characterization and process analysis 

      Skorpen, Kristian Grøtta (Doctoral theses at NTNU;2018:218, Doctoral thesis, 2018)
      The presented work highlights the possibilities inherent in a new method for continuous extrusion, i.e. hereafter named metal continuous screw extrusion (MCSE). This was done by expanding the knowledge of the process itself, ...
    • Secondary Hardening in Two Supermartensitic Stainless Steels 

      Sømme, Astri (Master thesis, 2012)
      Since the late nineties weldable supermartensitic stainless steels (SMSS) has been used in subsea flowlines, and more than 400 km is installed. Hydrogen related problems in the weld fabrication stage or hydrogen induced ...
    • Seebeck coefficients of cells with lithium carbonate and gas electrodes 

      Børset, Marit Takla; Kang, Xue; Burheim, Odne Stokke; Haarberg, Geir Martin; Xu, Q.; Kjelstrup, Signe (Journal article; Peer reviewed, 2015)
      The Seebeck coefficient is reported for thermoelectric cells with gas electrodes and a molten electrolyte of one salt, lithium carbonate, at an average temperature of 750 °C. We show that the coefficient, which is 0.88 mV ...
    • Seebeck coefficients of cells with molten carbonates relevant for the metallurgical industry 

      Kang, X.; Børset, Marit Takla; Burheim, Odne Stokke; Haarberg, Geir Martin; Xu, Q.; Kjelstrup, Signe (Journal article; Peer reviewed, 2015)
      We report Seebeck coefficients of electrochemical cells with molten carbonate mixtures as electrolytes and carbon dioxide|oxygen electrodes. The system is relevant for use of waste heat and off-gases with concentration of ...
    • Segregation of Mg, Cu and their effects on the strength of Al S5 (210) [001] symmetrical tilt grain boundary 

      Zhao, Dongdong; Løvvik, Ole Martin; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2018)
      Alien elemental segregation can pronouncedly change the grain boundary properties. Systematic first-principles calculations were performed to investigate the Mg and Cu segregation behavior at Σ5 (210)[001] symmetrical tilt ...
    • Selectivity of nanocrystalline Iro2-based catalysts in parallel chlorine and oxygen evolution 

      Kuznetsova, Elizaveta; petrykin, valery; Sunde, Svein; Krtil, Petr (Journal article; Peer reviewed, 2015)
      Nanocrystalline electrocatalysts with chemical composition corresponding to Ir1 − xMxO2 (M = Co, Ni, and Zn, 0.05 ≤ x ≤ 0.2) were prepared by the hydrolysis of H2IrCl6·4H2O solutions combined with nitrates and acetates of ...
    • Self-Poling and Ageing in PZT Thin Films With Interdigitated Electrodes - Work done at Laboratoire de Céramique (LC), EPFL 

      Ræder, Trygve Magnus (Master thesis, 2015)
      This work details advances in thin-film lead zirconate titanate (PZT) devices with interdigitated electrodes (IDEs). They are interesting for energy harvesting applications, as they can provide small amounts of electrical ...
    • Shape Factor Effect on Inclusion Sedimentation in Aluminum Melts 

      Gökelma, Mertol; Einarsrud, Kristian Etienne; Tranell, Gabriella; Friedrich, Bernd (Journal article; Peer reviewed, 2020)
      The quality requirements of aluminum products are steadily increasing, and the presence of non-metallic inclusions have a large impact on the quality of aluminum products. Sedimentation is a widely applied technique to ...
    • Shielded Active Gas Forge Welding of an L80 Steel in a Small Scale Shielded Active Gas Forge Welding Machine 

      Palanisamy, Vinothkumar; Solberg, Jan Ketil; Moe, Per Thomas (Peer reviewed; Journal article, 2021)
      Abstract: The Shielded Active Gas Forge Welding (SAG-FW) method is a solid-state welding technique in which the mating surfaces are heated by induction heating or direct electrical heating before being forged together to ...
    • Shielded Active Gas Forge Welding of L80 Steel for Offshore Applications 

      Palanisamy, Vinothkumar (Doktoravhandlinger ved NTNU, 1503-8181; 2014:33, Doctoral thesis, 2014)
    • Shock Heating Test of Quartz for Si and FeSi Production 

      Jusnes, Karin Fjeldstad; Tangstad, Merete; Ringdalen, Eli (Research report, 2017)
      Six different quartz types used as raw material for Si and FeSi production, were shock heated to 1500 °C in an induction furnace. The amounts of fines produced were measured and compared. The method has been used before ...
    • A short history of multiferroics 

      Meier, Dennis Gerhard; Lottermoser, Thomas (Journal article, 2020)
      The realization that materials with coexisting magnetic and ferroelectric order open up efficient ways to control magnetism by electric fields unites scientists from different communities in the effort to explore the ...
    • Si-based phase change materials in thermal energy storage systems 

      Jiao, Jian Meng (Doctoral theses at NTNU;2020:137, Doctoral thesis, 2020)
      The main aim of this dissertation is to develop new phase change materials (PCMs) for high temperature energy storage in thermal energy storage (TES) devices, with special focus on Si-based PCMs due to silicon’s the high ...
    • SiC crystalline micro bullets on bio-carbon based charcoal substrate 

      Jayakumari, Sethulakshmy; Vullum, Per Erik; Van Helvoort, Antonius; Tangstad, Merete (Peer reviewed; Journal article, 2020)
      Silicon carbide (SiC) micro bullets were grown on a bio-carbon based charcoal substrate, the morphology and crystal structure were analyzed. In order to collect the crystallographic details scanning electron microscopy ...
    • SiC production using SiO 2 and Cagglomerates 

      Li, Fei (Doctoral theses at NTNU;2017:180, Doctoral thesis, 2017)
      Due to the possible shortage of high-quality fossil carbon materials and charcoal for the Si industry, this study will focus on the possibility of using natural gas as the substitute of commercially scarce high quality ...
    • Silica from diatom frustules as anode material for Li-ion batteries 

      Norberg, Andreas Nicolai; Wagner, Nils Peter; Kaland, Henning; Vullum-Bruer, Fride; Svensson, Ann Mari (Journal article; Peer reviewed, 2019)
      In spite of its insulating nature, SiO2 may be utilized as active anode material for Li-ion batteries. Synthetic SiO2 will typically require sophisticated synthesis and/or activation procedures in order to obtain a ...
    • Silicon anodes for lithium-ion batteries produced from recovered kerf powders 

      Wagner, Nils Peter; Tron, Artur; Tolchard, Julian R; Noja, Gianluigi; Bellmann, Martin Pawel (Journal article; Peer reviewed, 2019)
      Silicon kerf waste from a photovoltaic silicon production process is assessed as an anode material for application as a lithium ion battery anode. In contrast to previous studies, the Si-kerf is used as-produced, with no ...