Browsing Det matematisk-naturvitenskapelige fakultet by Title

Now showing items 666-685 of 838

  • Stabilization of Ge-rich defect complexes originating from E centers in Si1-xGex:P 
    Kilpelainen, S; Kuitunen, K; Tuomisto, F; Slotte, J; Radamson, H.H.; Kuznetsov, Andrej (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2010)
    Thermal evolution of vacancy complexes was studied in P-doped ([P]=1018 cm−3) proton irradiated Si1−xGex with Ge contents of 10%, 20%, and 30% in the range of 250–350 °C using positron annihilation spectroscopy. The radiation ...
  • Statistical implications of the n = 1 observation of 1I/'Oumuamua 
    Toussaint, Renaud; Flekkøy, Eirik Grude (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    ABSTRACT We obtain the exact statistical distribution of expected detection rates that may be obtained from the detection of ‘Oumuamua, which currently belongs to a class of objects that is only observed once in ...
  • Statistical upscaling of ecosystem CO2 fluxes across the terrestrial tundra and boreal domain: regional patterns and uncertainties 
    Virkkala, Anna-Maria; Aalto, Juha; Rogers, Brendan M.; Tagesson, Torbern; Treat, Claire C.; Natali, Susan M.; Watts, Jennifer D.; Potter, Stefano; Lehtonen, Aleksi; Mauritz, Marguerite; Schuur, Edward A. G.; Kochendorfer, John; Zona, Donatella; Oechel, Walter C.; Kobayashi, Hideki; Humphreys, Elyn; Goeckede, Mathias; Iwata, Hiroki; Lafleur, Peter M.; Euskirchen, Eugénie S.; Bokhorst, Stef; Marushchak, Maija; Martikainen, Pertti J.; Elberling, Bo; Voigt, Carolina; Biasi, Christina; Sonnentag, Oliver; Parmentier, Frans-Jan W.; Ueyama, Masahito; Celis, Gerardo; St.Louis, Vincent L.; Emmerton, Craig A.; Peichl, Matthias; Chi, Jinshu; Järveoja, Järvi; Nilsson, Mats B.; Oberbauer, Steven F.; Torn, Margaret S.; Park, Sang-Jong; Dolman, Han; Mammarella, Ivan; Chae, Namyi; Poyatos, Rafael; López-Blanco, Efrén; Christensen, Torben R.; Kwon, Min Jung; Sachs, Torsten; Holl, David; Luoto, Miska (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    The regional variability in tundra and boreal carbon dioxide (CO2) fluxes can be high, complicating efforts to quantify sink-source patterns across the entire region. Statistical models are increasingly used to predict ...
  • Statistics of the separation between sliding rigid rough surfaces: Simulations and extreme value theory approach 
    Ponthus, Nicolas; Scheibert, Julien; Thøgersen, Kjetil; Malthe-Sørenssen, Anders; Perret-Liaudet, Joel (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    When a rigid rough solid slides on a rigid rough surface, it experiences a random motion in the direction normal to the average contact plane. Here, through simulations of the separation at single-point contact between ...
  • Stoner ferromagnetism in hole-doped CuM(IIIA)2 with M(IIIA) = Al, Ga, and In 
    Iordanidou, Konstantina; Persson, Clas (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Using density functional theory calculations, we examine the effect of hole doping on the magnetic and electronic properties of CuMIIIAO2, with MIIIA = Al, Ga, and In. CuMIIIAO2 nonmagnetic semiconductors switch to ...
  • Strain Modulation of Si Vacancy Emission from SiC Micro- and Nanoparticles 
    Vasquez, Geraldo Cristian; Bathen, Marianne Etzelmüller; Galeckas, Augustinas; Bazioti, Kalliopi; Johansen, Klaus Magnus H; Maestre, D.; Cremades, A.; Prytz, Øystein; Moe, A.M.; Kuznetsov, Andrej; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Single-photon emitting point defects in semiconductors have emerged as strong candidates for future quantum technology devices. In the present work, we exploit crystalline particles to investigate relevant defect localizations, ...
  • Strain-induced trace element mobility in a quartz-sulphide vein system: An example from the ONKALO™ spent nuclear fuel repository (Olkiluoto, SW Finland) 
    Marchesini, Barbara; Menegon, Luca; Schwarz, G; Neff, C; Keresztes Schmidt, P; Garofalo, Paolo Stefano; Hattendorf, B; Gunther, Detlef; Mattila, Jussi; Viola, Giulio (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
    This work investigates element mobility and deformation mechanisms in sulphide-bearing quartz veins associated with a strike-slip fault exposed in the ONKALO™ Finnish deep repository for spent nuclear fuel (Olkiluoto Island, ...
  • Stratigraphic and Spatial Extent of HALIP Magmatism in Central Spitsbergen 
    Senger, Kim; Galland, Olivier (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Rapid extensive magmatism may have a profound effect on global climate by liberating and releasing greenhouse gases to the atmosphere through contact metamorphism of lithologically heterogeneous host rocks and degassing ...
  • Stress Field Interactions Between Overlapping Shield Volcanoes: Borehole Breakout Evidence From the Island of Hawai'i, USA 
    Pierdominici, Simona; Millet, John M.; Kück, Jochem K. M.; Thomas, Donald; Jerram, Dougal Alexander; Planke, Sverre; Haskins, Eric; Lautze, Nicole; Galland, Olivier (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Knowledge of the in situ stress state of the Earth's crust plays a key role in understanding geological processes including plate tectonics, earthquakes, slope failure, and igneous emplacement. In this paper, we determine ...
  • Stress in ordered systems: Ginzburg-Landau-type density field theory 
    Skogvoll, Vidar; Skaugen, Audun; Angheluta, Luiza (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    We present a theoretical method for deriving the stress tensor and elastic response of ordered systems within a Ginzburg-Landau-type density field theory in the linear regime. This is based on spatially coarse graining the ...
  • Strong enhancement of level densities in the crossover from spherical to deformed neodymium isotopes 
    Guttormsen, Magne Sveen; Alhassid, Yoram; Ryssens, Wouter; Ay, K.o.; Ozgur, Mustafa; Algin, Emel; Larsen, Ann-Cecilie; Bello Garrote, Frank Leonel; Crespo Campo, Lucia; Dahl-Jacobsen, Tomas; Görgen, Andreas; Hagen, Trine Wiborg; Ingeberg, Vetle Wegner; Kheswa, Bonginkosi Vincent; Klintefjord, Malin; Midtbø, Jørgen E.; Modamio, Victor; Renstrøm, Therese; Sahin, Eda; Siem, Sunniva; Tveten, Gry Merete; Zeiser, Fabio (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Understanding the evolution of level densities in the crossover from spherical to well-deformed nuclei has been a long-standing problem in nuclear physics. We measure nuclear level densities for a chain of neodymium isotopes ...
  • Strong Interplay between Sodium and Oxygen in Kesterite Absorbers: Complex Formation, Incorporation, and Tailoring Depth Distributions 
    Grini, Sigbjørn; Sopiha, Kostiantyn; Ross, Nils; Liu, Xin; Bjørheim, Tor Svendsen; Platzer-Björkman, Charlotte; Persson, Clas; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Sodium and oxygen are prevalent impurities in kesterite solar cells. Both elements are known to strongly impact performance of the kesterite devices and can be connected to efficiency improvements seen after heat treatments. ...
  • Strong self-sensitized green and NIR emission in NaYS2 doped with Pr3+ and Yb3+ by inducing Laporte allowed and charge transfer transitions 
    Hansen, Per-Anders Stensby; Kumar, Susmit; Meijerink, Andries (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Down conversion of solar UV and blue light is one of the few ways of surpassing the Shockley-Queisser limit of solar cells. One of the most efficient down conversion systems is the Pr3+ - Yb3+ lanthanide pair. However, ...
  • Strongly visible light-absorbing metal-organic frameworks functionalized by cyclometalated ruthenium(ii) complexes 
    Thoresen, Eirik Mydske; Øien-Ødegaard, Sigurd; Kaur, Gurpreet; Tilset, Mats; Lillerud, Karl Petter; Amedjkouh, Mohamed (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Four different ruthenium(II) complexes were incorporated into the metal–organic framework (MOF) UiO-67 using three different synthetic strategies: premade linker synthesis, postsynthetic functionalization, and postsynthetic ...
  • Structural and Geochemical Interactions Between Magma and Sedimentary Host Rock: The Hovedøya Case, Oslo Rift, Norway 
    Poppe, Sam; Galland, Olivier; de Winter, N. J.; Goderis, S.; Claeys, P.; Debaille, V.; Boulvais, Philippe; Kervyn, Matthieu (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Two end‐member conceptual models are used to describe deformation of the Earth's crust induced by magma intrusion. “Mode I” fracturing assumes tensile or opening‐mode, elastic deformation, while “Mode II” fracturing assumes ...
  • Structural and magnetic characterization of the elusive Jahn-Teller active NaCrF3 
    Bernal, Fabian Leonardo Martinez; Sottmann, Jonas; Wragg, David; Fjellvåg, Helmer; Fjellvåg, Øystein; Drathen, Christina; Slawinski, Wojciech Andrzej; Løvvik, Ole Martin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We report on the structural and magnetic properties of the elusive Jahn-Teller active compound NaCrF3, for first time synthesized in large quantities allowing detailed characterization. The crystal structure of NaCrF3 is ...
  • Structural and magnetic properties of antifluorite-type Li5+xFe1−xCoxO4 
    Thøgersen, Rasmus Vester; Fjellvåg, Asbjørn Slagtern; Fjellvåg, Øystein Slagtern; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract We report on the structural and magnetic properties of Li 5+ x Fe 1− x Co x O 4 (0≤ x ≤1).< The system assumes two distinct crystal structures at room temperature (α and β), and shows a transition in preference ...
  • Structural and metamorphic inheritance controls strain partitioning during orogenic shortening (Kalak Nappe Complex, Norwegian Caledonides). 
    Ceccato, Alberto; Menegon, Luca; Warren, Clare; Halton, Alison M. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    The occurrence of pre-collisional structural and metamorphic fabrics may control the development of new structures during subsequent orogenic deformation. Structural, petrological and geochronological analyses have been ...
  • Structural disorder and antiferromagnetism in LaNi1–xPtxO3 
    Fjellvåg, Asbjørn Slagtern; Fjellvåg, Øystein; Breard, Y.; Sjåstad, Anja Olafsen (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
    We report on the B-site substitution of Pt for Ni in the system LaNi1–xPtxO3. The system can only be synthesized between x ​≤ ​0.50, with LaNiO3 (x ​= ​0.00) and the stoichiometric double perovskite La2NiPtO6 (x ​= ​0.50) ...
  • Structural Elucidation, Aggregation, and Dynamic Behaviour of N,N,N,N-Copper(I) Schiff Base Complexes in Solid and in Solution: A Combined NMR, X-ray Spectroscopic and Crystallographic Investigation 
    Gerz, Isabelle; Jannuzzi, Sergio Augusto Venturinelli; Hylland, Knut Tormodssønn; Negri, Chiara; Wragg, David Stephen; Øien-Ødegaard, Sigurd; Tilset, Mats; Olsbye, Unni; DeBeer, Serena; Amedjkouh, Mohamed (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    A series of Cu(I) complexes of bidentate or tetradentate Schiff base ligands bearing either 1-H-imidazole or pyridine moieties were synthesized. The complexes were studied by a combination of NMR and X-ray spectroscopic ...