Browsing Det matematisk-naturvitenskapelige fakultet by Title

Now showing items 530-549 of 838

  • On the permittivity of titanium dioxide 
    Bonkerud, Julie; Zimmermann, Christian; Weiser, Philip Michael; Vines, Lasse; Monakhov, Eduard (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Abstract Conductive rutile TiO 2 has received considerable attention recently due to multiple applications. However, the permittivity in conductive, reduced or doped TiO 2 appears to cause controversy with reported values ...
  • On the possible nature of deep centers in Ga2O3 
    Polyakov, A.Y.; Kochkova, A.I.; Langørgen, Amanda; Vines, Lasse; Vasilev, A.; Shchemerov, I.V.; Romanov, A.A.; Pearton, S.J. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    The electric field dependence of emission rate of the deep traps with level near Ec−0.6 eV, so-called E1 traps, was studied by means of deep level transient spectroscopy measurements over a wide range of applied voltages. ...
  • On the scale dependence in the dynamics of frictional rupture: Constant fracture energy versus size-dependent breakdown work 
    Paglialunga, Federica; Passelègue, François X.; Brantut, Nicolas; Barras, Fabian; Lebihain, Mathias; Violay, Marie (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Potential energy stored during the inter-seismic period by tectonic loading around faults is released during earthquakes as radiated energy, frictional dissipation and fracture energy. The latter is of first importance ...
  • One-pot synthesis of cobalt-rhenium nanoparticles taking the unusual beta-Mn type structure 
    Zacharaki, Eirini; Bremmer, Marien G.; Vajeeston, Ponniah; Kalyva, Maria Evangelou; Fjellvåg, Helmer; Kooyman, Patricia J.; Sjåstad, Anja Olafsen (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Using a facile one-pot colloidal method, it is now possible to obtain monodisperse Co1−xRex nanoparticles (NPs), with excellent control of Re stoichiometry for x < 0.15. Re-incorporation in terms of a solid solution ...
  • Onset of turbulence in channel flows with scale-invariant roughness 
    Linga, Gaute; Angheluta, Luiza; Mathiesen, Joachim (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Using 3D direct numerical simulations of the Navier–Stokes equations, we study the effect of a self-affine wall roughness on the onset of turbulence in channel flow. We quantify the dependence of the turbulent intensity ...
  • Ontogenic succession of thermokarst thaw ponds is linked to dissolved organic matter quality and microbial degradation potential 
    Peura, Sari; Wauthy, Maxime; Simone, Domenico; Eiler, Alexander; Einarsdottir, Karolina; Rautio, Milla; Bertilsson, Stefan (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Warming climate is thawing the permafrost in arctic and subarctic regions, leading to formation of thermokarst ponds. During the formation and geomorphological succession of these ponds, carbon that has been trapped in ...
  • Operando Investigations of Lithiation and Delithiation Processes in the BiVO4 Anode Material 
    Ruud, Amund; Sottmann, Jonas; Vajeeston, Ponniah; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
  • Operando Laboratory-Based Multi-Edge X-Ray Absorption Near-Edge Spectroscopy of Solid Catalysts 
    Genz, Nina; Kallio, Antti-Jussi; Oord, Ramon; Krumeich, Frank; Pokle, Anuj; Prytz, Øystein; Olsbye, Unni; Meirer, Florian; Huotari, Simo; Weckhuysen, Bert M. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Laboratory-based X-ray absorption spectroscopy (XAS) and especially X-ray absorption near-edge structure (XANES) offers new opportunities in catalyst characterization and presents not only an alternative, but also a ...
  • Operando XRD studies on Bi2MoO6 as anode material for Na-ion batteries 
    Brennhagen, Anders; Cavallo, Carmen; Wragg, David Stephen; Ponniah, Vajeeston; Sjåstad, Anja Olafsen; Koposov, Alexey; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Based on the same rocking-chair principle as rechargeable Li-ion batteries, Na-ion batteries are promising solutions for energy storage benefiting from low-cost materials comprised of abundant elements. However, despite ...
  • Ophicarbonates of the Feragen Ultramafic Body, central Norway 
    Dunkel, Kristina G; Jamtveit, Bjørn; Austrheim, Håkon Olaf (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    The carbonation of ultramafic rocks is a common alteration process in ophiolites and can occur in various settings. We provide the first detailed description of the carbonated peridotites (ophicarbonates) of the Feragen ...
  • Optical properties of ZnFe2O4 nanoparticles and Fe-decorated inversion domain boundaries in ZnO 
    Kjeldby, Snorre Braathen; Nguyen, Phuong Dan; García Fernández, Javier; Haug, K.; Galeckas, Augustinas; Jensen, Ingvild Julie Thue; Thøgersen, Annett; Vines, Lasse; Prytz, Øystein (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    The maximum efficiency of solar cells utilizing a single layer for photovoltaic conversion is given by the single junction Shockley–Queisser limit. In tandem solar cells, a stack of materials with different band gaps ...
  • Optical signatures of single ion tracks in ZnO 
    Vasquez, Geraldo Cristian; Johansen, Klaus Magnus H; Galeckas, Augustinas; Vines, Lasse; Svensson, Bengt Gunnar (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    The optical properties of single ion tracks have been studied in ZnO implanted with Ge by combining depth-resolved hyperspectral cathodoluminescence (CL) and photoluminescence (PL) spectroscopy techniques. The results ...
  • Optimizing an adult tacrolimus population pharmacokinetic model and extrapolating it to paediatric renal transplant recipients 
    Sandbakken, Karoline (Master thesis / Masteroppgave, 2023)
  • Order-to-Disorder Transition and Hydrogen Bonding in the Jahn-Teller Active NH4CrF3 Fluoroperovskite 
    Fjellvåg, Øystein Slagtern; Gonano, Bruno; Bernal, Fabian Leonardo Martinez; Amedi, Salah Bra; Lyu, Jike; Pomjakushin, Vladimir; Medarde, Marisa; Chernyshov, Dmitry; Marshall, Kenneth; Valldor, Björn Martin; Fjellvåg, Helmer; Hauback, Bjørn Christian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
    Large quantities of high-purity NH4CrF3 have been synthesized using a wet-chemical method, and its structural chemistry and magnetic properties are investigated in detail for the first time. NH4CrF3 is a tetragonal ...
  • Organic-rich shale caprock properties of potential CO2 storage sites in the northern North Sea, offshore Norway 
    Rahman, Jamil Ur; Fawad, Manzar; Mondol, Nazmul Haque (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Assessment of the geomechanical properties of organic-rich shale caprocks is critical for a successful CO2 storage into a saline aquifer. In this study, we investigated the geochemical properties of the organic-rich shale ...
  • Origin of enhanced conductivity in low dose ion irradiated oxides 
    Borgersen, Jon; Karsthof, Robert Michael; Rønning, Vegard; Vines, Lasse; Von Wenckstern, Holger; Grundmann, Marius; Kuznetsov, Andrej Yu.; Johansen, Klaus Magnus Håland (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Significant resistivity variations have previously been observed in oxides subjected to relatively low ion irradiation doses, nominally insufficient to generate the amount of bulk defects needed to explain the phenomena. ...
  • Origin of the counterintuitive dynamic charge in the transition metal dichalcogenides 
    Pike, Nicholas; Van Troeye, Benoit; Dewandre, Antoine; Petretto, Guido; Gonze, Xavier; Rignanese, Gian-Marco; Verstraete, Matthieu (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    espite numerous studies of transition metal dichalcogenides, the diversity of their chemical bonding characteristics and charge transfer is not well understood. Based on density functional theory we investigate their static ...
  • Outcrop scale mixing enhanced by permeability variations: the role of stationary and travelling waves of high saturation indices 
    Koehn, Daniel; Kelka, Ulrich; Toussaint, Renaud; Siegel, Coralie; Mullen, Gary; Boyce, Adrian; Piazolo, Sandra (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract To study the ore mineralization at the outcrop scale we merge an advection–diffusion simulation with the geochemical software iphreeqc to model the mixing of two realistic fluids. We simulate the infiltration ...
  • Oxidation-enhanced annealing of implantation-induced Z(1/2) centers in 4H-SiC: Reaction kinetics and modeling 
    Løvlie, Lars Sundnes; Svensson, Bengt Gunnar (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2012)
    High-purity epitaxial layers of n-type 4H-SiC have been implanted with 4.3-MeV Si ions to a dose of 3 × 108 cm−2 and then subjected to dry isothermal oxidation at temperatures between 1050 and 1175 °C. Analysis of the ...
  • Oxygen permeability and surface kinetics of composite oxygen transport membranes based on stabilized δ-Bi2O3 
    Emhjellen, Linn Katinka Susanne Shi; Xing, Wen; Li, Zuoan; Haugsrud, Reidar (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Composite ceramic membranes based on the ionic conducting Tm-stabilized δ-Bi2O3 (BTM) and the electronic conducting (La0.8Sr0.2)0.99MnO3-δ (LSM) exhibit among the highest oxygen flux values reported for Bi2O3-based membranes. ...