Browsing Det matematisk-naturvitenskapelige fakultet by Title

Now showing items 815-834 of 838

  • Vacancy clustering and acceptor activation in nitrogen-implanted ZnO 
    Børseth, Thomas J. Moe; Tuomisto, F; Christensen, Jens S.; Monakhov, Edouard; Svensson, Bengt Gunnar; Kuznetsov, Andrej (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2008)
    The role of vacancy clustering and acceptor activation on resistivity evolution in N ion-implanted n-type hydrothermally grown bulk ZnO has been investigated by positron annihilation spectroscopy, resistivity measurements, ...
  • Vacancy defect and defect cluster energetics in ion-implanted ZnO 
    Dong, Yufeng; Tuomisto, F; Svensson, Bengt Gunnar; Kuznetsov, Andrej; Brillson, Leonard J. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2010)
    We have used depth-resolved cathodoluminescence, positron annihilation, and surface photovoltage spectroscopies to determine the energy levels of Zn vacancies and vacancy clusters in bulk ZnO crystals. Doppler broadening-measured ...
  • Valence state, lattice incorporation, and resulting magnetic properties of Ni in Zn/Co-based magnetic oxides 
    Ney, Verena; Henne, Bastian; de Souza, Mariano; Jantsch, Wolfgang; Johansen, Klaus Magnus Håland; Wilhelm, Fabrice; Rogalev, Andrei; Ney, Andreas (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
    Ni incorporation has been studied in a comprehensive range of Zn/Co-based magnetic oxides to elucidate its valence state and lattice incorporation. The resulting structural and magnetic properties of a range of related ...
  • Variability in the formation and framework polymorphism of metal-organic frameworks based on yttrium(III) and the bifunctional organic linker 2,5-dihydroxyterephthalic acid 
    Dietzel, Pascal D.C.; Blom, Richard; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Depending on the solvothermal reaction conditions, we obtained three different metal‐organic frameworks with yttrium(III) as metal component and 2,5‐dihdyroxyterepthalic acid (H4dhtp) as bifunctional organic linker: ...
  • Variability of the surface energy balance in permafrost-underlain boreal forest 
    Stuenzi, Simone Maria; Boike, Julia; Cable, William; Herzschuh, Ulrike; Kruse, Stefan; Pestryakova, Luidmila A.; Schneider von Deimling, T; Westermann, Sebastian; Zakharov, Evgenii; Langer, Moritz (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Abstract. Boreal forests in permafrost regions make up around one-third of the global forest cover and are an essential component of regional and global climate patterns. Further, climatic change can trigger extensive ...
  • Variable temperature in situ TEM mapping of the thermodynamically stable element distribution in bimetallic Pt-Rh nanoparticles 
    Jensen, Martin Myhre; Kierulf-Vieira, Walace; Kooyman, Patricia J.; Sjåstad, Anja Olafsen (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    We report here the first variable temperature in situ transmission electron microscopy (TEM) study on smaller Pt–Rh nanoparticles (≤24 nm) under vacuum conditions. Well-defined 50 at% Pt/50 at% Rh Pt–Rh solid solution and ...
  • Variants in the CETP gene affect levels of HDL cholesterol by reducing the amount, and not the specific lipid transfer activity, of secreted CETP 
    Ølnes, Åsa Schawlann; Teigen, Marianne; Lærdahl, Jon Kristen; Leren, Trond Paul; Strøm, Thea Bismo; Bjune, Katrine (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Background Cholesteryl ester transfer protein (CETP) transfers cholesteryl esters in plasma from high density lipoprotein (HDL) to very low density lipoprotein and low density lipoprotein. Loss-of-function variants in the ...
  • Vegetation type is an important predictor of the arctic summer land surface energy budget 
    Oehri, Jacqueline; Schaepman-Strub, Gabriela; Kim, Jin-Soo; Grysko, Raleigh; Kropp, Heather; Grünberg, Inge; Zemlianskii, Vitalii; Sonnentag, Oliver; Euskirchen, Eugénie S.; Reji Chacko, Merin; Muscari, Giovanni; Blanken, Peter D.; Dean, Joshua F.; di Sarra, Alcide; Harding, Richard J.; Sobota, Ireneusz; Kutzbach, Lars; Plekhanova, Elena; Riihelä, Aku; Boike, Julia; Miller, Nathaniel B.; Beringer, Jason; López-Blanco, Efrén; Stoy, Paul C.; Sullivan, Ryan C.; Kejna, Marek; Parmentier, Frans-Jan W.; Gamon, John A.; Mastepanov, Mikhail; Wille, Christian; Jackowicz-Korczynski, Marcin; Karger, Dirk N.; Quinton, William L.; Putkonen, Jaakko; van As, Dirk; Christensen, Torben R.; Hakuba, Maria Z.; Stone, Robert S.; Metzger, Stefan; Vandecrux, Baptiste; Frost, Gerald V.; Wild, Martin; Hansen, Birger Ulf; Meloni, Daniela; Domine, Florent; te Beest, Mariska; Sachs, Torsten; Kalhori, Aram; Rocha, Adrian V.; Williamson, Scott N.; Morris, Sara; Atchley, Adam L.; Essery, Richard; Runkle, Benjamin R. K.; Holl, David; Riihimaki, Laura D.; Iwata, Hiroki; Schuur, Edward A. G.; Cox, Christopher J.; Grachev, Andrey A.; McFadden, Joseph P.; Fausto, Robert S.; Göckede, Mathias; Ueyama, Masahito; Pirk, Norbert; de Boer, Gijs; Bret-Harte, M. Syndonia; Leppäranta, Matti; Steffen, Konrad; Friborg, Thomas; Ohmura, Atsumu; Edgar, Colin W.; Olofsson, Johan; Chambers, Scott D. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract Despite the importance of high-latitude surface energy budgets (SEBs) for land-climate interactions in the rapidly changing Arctic, uncertainties in their prediction persist. Here, we harmonize SEB observations ...
  • Vibrational and dielectric properties of the bulk transition metal dichalcogenides 
    Pike, Nicholas; Dewandre, Antoine; Van Troeye, Benoit; Gonze, Xavier; Verstraete, Matthieu (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Interest in the bulk transition metal dichalcogenides for their electronic, photovoltaic, and optical properties has grown and led to their use in many technological applications. We present a systematic investigation of ...
  • Vibrational properties of High Entropy Alloy based metal hydrides probed by inelastic neutron scattering 
    Ek, Gustav; Fjellvåg, Øystein; Vajeeston, Ponniah; Armstrong, Jeff; Sahlberg, Martin; Häussermann, Ulrich (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    The vibrational properties of several High Entropy Alloy (HEA) based metal hydrides are investigated by inelastic neutron scattering (INS). HEAs have recently emerged as a new type of materials with a wide range of intriguing ...
  • Visible Light Driven Photocatalytic Decolorization and Disinfection of Water Employing Reduced TiO2 Nanopowders 
    Kang, Xiaolan; Berberidou, Chrysanthi; Galeckas, Augustinas; Bazioti, Kalliopi; Sagstuen, Einar; Norby, Truls Eivind; Poulios, Ioannis; Chatzitakis, Athanasios Eleftherios (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Defect-engineering of TiO2 can have a major impact on its photocatalytic properties for the degradation of persisting and non-biodegradable pollutants. Herein, a series of intrinsic and extrinsic defects are induced by ...
  • Volumetric and shear processes in crystalline rock approaching faulting 
    Renard, Francois; McBeck, Jessica Ann; Kandula, Neelima; Cordonnier, Benoit; Meakin, Paul; Ben-Zion, Yehuda (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Understanding the approach to faulting in continental rocks is critical for identifying processes leading to fracturing in geomaterials and the preparation process of large earthquakes. In situ dynamic X-ray imaging and ...
  • Volumetric and Shear Strain Localization in Mt. Etna Basalt 
    McBeck, Jessica Ann; Cordonnier, Benoit; Vinciguerra, Sergio; Renard, Francois (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    To examine the impact of preexisting weaknesses on fracture coalescence during volcanic edifice deformation, we triaxially compressed Mount Etna basalt while acquiring in situ dynamic X‐ray microtomograms and calculated ...
  • Warming Accelerates the Onset of the Molecular Stress Response and Increases Mortality of Larval Atlantic Cod 
    Oomen, Rebekah Alice; Knutsen, Halvor; Olsen, Esben Moland; Jentoft, Sissel; Stenseth, Nils Christian; Hutchings, Jeffrey (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Synopsis Temperature profoundly affects ectotherm physiology. Although differential thermal responses influence fitness, thus driving population dynamics and species distributions, our understanding of the molecular ...
  • Water browning controls adaptation and associated trade-offs in phytoplankton stressed by chemical pollution 
    Rizzuto, Simone; Thrane, Jan-Erik; Baho, Didier Ludovic; Jones, Kevin C.; Zhang, Hao; Hessen, Dag Olav; Nizzetto, Luca; Leu, Eva Susanne (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    The acquisition of tolerance to an environmental stressor can result in organisms displaying slower growth after stress release. While well-grounded in the theory, empirical evidence of the trade-off between stress tolerance ...
  • Water Vapor Photoelectrolysis in a Solid-State Photoelectrochemical Cell with TiO2 Nanotubes Loaded with CdS and CdSe Nanoparticles 
    Kang, Xiaolan; Chaperman, Larissa; Galeckas, Augustinas; Ammar, Souad; Mammeri, Fayna; Norby, Truls; Chatzitakis, Athanasios (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    In this study, polyol-made CdS and CdSe crystalline nanoparticles (NPs) are loaded by impregnation on TiO2 nanotube arrays (TNTAs) for solar-simulated light-driven photoelectrochemical (PEC) water vapor splitting. For the ...
  • Widespread synchrony in phosphorus concentrations in northern lakes linked to winter temperature and summer precipitation 
    Isles, Peter D. F.; Creed, Irena F.; Hessen, Dag Olav; Kortelainen, Pirkko; Paterson, Michael; Pomati, Francesco; Rusak, James A.; Vuorenmaa, Jussi; Bergström, Ann-Kristin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract In recent years, unexplained declines in lake total phosphorus (TP) concentrations have been observed at northern latitudes (> 42°N latitude) where most of the world's lakes are found. We compiled data from 389 ...
  • Zeolite surface methoxy groups as key intermediates in the stepwise conversion of methane to methanol 
    Dyballa, Michael Martin; Thorshaug, Knut; Pappas, Dimitrios; Borfecchia, Elisa; Kvande, Karoline; Bordiga, Silvia; Berlier, Gloria; Lazzarini, Andrea; Olsbye, Unni; Beato, Pablo; Svelle, Stian; Arstad, Bjørnar (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    This contribution clarifies the overoxidation-preventing key step in the methane-to-methanol (MTM) conversion over copper mordenite zeolites. We followed the methane-to-methanol conversion over copper mordenite zeolites ...
  • Zinc vacancy and oxygen interstitial in ZnO revealed by sequential annealing and electron irradiation 
    Knutsen, Knut Erik; Galeckas, Augustinas; Zubiaga, Asier; Tuomisto, Filip; Farlow, Gary C.; Svensson, Bengt Gunnar; Kuznetsov, Andrej (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2012)
    By combining results from positron annihilation and photoluminescence spectroscopy with data from Hall effect measurements, the characteristic deep level emission centered at ∼1.75 eV and exhibiting an activation energy ...
  • Zinc-Vacancy–Donor Complex: A Crucial Compensating Acceptor in ZnO 
    Stehr, J. E.; Johansen, Klaus Magnus H; Bjørheim, Tor Svendsen; Vines, Lasse; Svensson, Bengt Gunnar; Chen, W. M.; Buyanova, I. A. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    The aluminum–zinc-vacancy (AlZn−VZn) complex is identified as one of the dominant defects in Al-containing n-type ZnO after electron irradiation at room temperature with energies above 0.8 MeV. The complex is energetically ...