Browsing Det matematisk-naturvitenskapelige fakultet by Title

Now showing items 765-784 of 838

  • Thermal conduction through a cool well 
    Baldelli, Beatrice; Linga, Gaute; Flekkøy, Eirik Grude (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We study a differentially heated square cavity with inlet and outlet ports at the top of the side walls, quantifying how the effective thermal conductivity changes with the temperature difference across the system. The ...
  • Thermal effects at continent‐ocean transform margins: A 3d perspective 
    Schmid, Daniel Walter; Iyer, Karthik; Hartz, Ebbe Hvidegård (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Continental breakup along transform margins produces a sequence of (1) continent-continent, (2) continent-oceanic, (3) continent-ridge, and (4) continent-oceanic juxtapositions. Spreading ridges are the main sources of ...
  • Thermal Stability of Schottky Contacts and Rearrangement of Defects in β-Ga2O3 Crystals 
    Seyidov, Palvan; Varley, Joel B.; Frodason, Ymir Kalmann; Klimm, Detlef; Vines, Lasse; Galazka, Zbigniew; Chou, Ta-Shun; Popp, Andreas; Irmscher, Klaus; Fiedler, Andreas (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract The thermal stability of different Schottky contacts (Au, Pt, and Ni) on (100) β ‐Ga 2 O 3 single crystals grown by the Czochralski method is investigated. Besides the examination of the Schottky barrier parameters, ...
  • Thermal versus radiation-assisted defect annealing in β-Ga2O3 
    Azarov, Alexander; Venkatachalapathy, Vishnukanthan; Lee, In-Hwan; Kuznetsov, Andrej (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2023)
    Gallium oxide (Ga2O3) exhibits complex behavior under ion irradiation since ion-induced disorder affects not only the functional properties but can provoke polymorphic transformations in Ga2O3. A conventional way used to ...
  • Thermal weakening of cracks and brittle-ductile transition of matter: A phase model 
    Vincent-Dospital, Tom; Toussaint, Renaud; Cochard, Alain; Måløy, Knut Jørgen; Flekkøy, Eirik Grude (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We present a model for the thermally activated propagation of cracks in elastic matrices. The propagation is considered as a subcritical phenomenon, the kinetics of which is described by an Arrhenius law. In this law, we ...
  • Thermally induced surface instability in ion-implanted MgxZn1−xO films 
    Azarov, Alexander; Hallén, Anders; Du, Xiaolong; Liu, Z. L.; Svensson, Bengt Gunnar; Kuznetsov, Andrej (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2011)
    Thermal stability of originally single crystalline wurtzite MgxZn1−xO (x ⩽ 0.3) films implanted at room temperature with 166Er ions is studied by a combination of Rutherford backscattering spectrometry, time-of-flight ...
  • Thermodynamic stability, phase separation and Ag grading in (Ag,Cu)(In,Ga)Se2 solar absorbers 
    Sopiha, Kostiantyn; Larsen, J; Donzel-Gargand, Olivier; Khavari, F; Keller, J; Edoff, Marika; Platzer-Björkman, C.; Persson, Clas; Scragg, Jonathan (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Gallium alloying and grading in Cu(In,Ga)Se2 (CIGS) are well-established strategies for improving performance of thin-film solar cells by tailoring band profiles within the absorber. Similarly, Ag incorporation is considered ...
  • Thermoelectric properties of A-site deficient La-doped SrTiO3 at 100–900 °C under reducing conditions 
    Singh, Sathya Prakash; Kanas, Nikola; Desissa, Temesgen Debelo; Johnsson, Mats; Einarsrud, Mari-Ann; Norby, Truls Eivind; Wiik, Kjell (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Lanthanum doped strontium titanate is a potential n-type thermoelectric material at moderate and high temperatures. (La0.12Sr0.88)0.95TiO3 ceramics were prepared by two different routes, conventional sintering at 1500 °C ...
  • Thermoelectric properties of non-stoichiometric CaMnO3-d composites formed by redox-activated exsolution. 
    Singh, Sathya Prakash; Kanas, Nikola; Desissa, Temesgen Debelo; Einarsrud, Mari-Ann; Norby, Truls Eivind; Wiik, Kjell (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    A novel synthesis route for preparing well-defined composites based on CMO (CaMnO3) has been established taking advantage of the unique phase relations in the system Ca-Mn-O at reducing- and oxidizing atmosphere, respectively. ...
  • Thermoelectric transport trends in group 4 half-Heusler alloys 
    Berland, Kristian; Shulumba, Nina; Hellman, Olle; Persson, Clas; Løvvik, Ole Martin (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    The thermoelectric properties of 54 different group 4 half-Heusler (HH) alloys have been studied from first principles. Electronic transport was studied with density functional theory using hybrid functionals facilitated ...
  • Thermohydrological Impact of Forest Disturbances on Ecosystem-Protected Permafrost 
    Stuenzi, Simone Maria; Kruse, Stefan; Boike, Julia; Herzschuh, Ulrike; Oehme, Alexander; Pestryakova, Luidmila A.; Westermann, Sebastian; Langer, Moritz (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Boreal forests cover over half of the global permafrost area and protect underlying permafrost. Boreal forest development, therefore, has an impact on permafrost evolution, especially under a warming climate. Forest ...
  • Thin films made by reactive sputtering of high entropy alloy FeCoNiCuGe: Optical, electrical and structural properties 
    Mayandi, Jeyanthinath; Finstad, Terje Gunnar; Dahl, Øyvind; Ponniah, Vajeeston; Schrade, Matthias; Løvvik, Ole Martin; Diplas, Spyridon; Almeida Carvalho, Patricia (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Films were reactively sputtered from a high entropy alloy (HEA) FeCoNiCuGe target in an Ar/O2 plasma. The case of zero O2 gas flow yielded HEA films of FeCoNiCuGe. These as-deposited HEA films have a face centered cubic ...
  • Thio-olivine Mn2SiS4 thin films by reactive magnetron sputtering: Structural and optical properties with insights from first principles calculations 
    Davydova, A; Eriksson, J; Chen, Rongzhen; Rudisch, K; Persson, Clas; Scragg, Jonathan (Journal article / Tidsskriftartikkel / SubmittedVersion, 2018)
    Thio-olivines such as (Fe,Mn)2(Si,Ge)S4 have been proposed as candidate earthabundant materials for single and multi-junction solar cells. In this work we present the first investigation of Mn2SiS4thin films prepared by ...
  • Ti- and Fe-related charge transition levels in beta-Ga2O3 
    Zimmermann, Christian; Frodason, Ymir Kalmann; Barnard, Abraham Willem; Varley, Joel B; Irmscher, Klaus; Galazka, Zbigniew; Karjalainen, Antti; Meyer, Walter Ernst; Auret, F.D.; Vines, Lasse (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Deep-level transient spectroscopy measurements on β-Ga2O3 crystals reveal the presence of three defect signatures labeled E2a, E2b, and E3 with activation energies at around 0.66 eV, 0.73 eV, and 0.95 eV below the conduction ...
  • Time-enhanced performance of oxide thermoelectric modules based on a hybrid p-n junction 
    Kanas, Nikola; Bjørk, Rasmus; Wells, Kristin Høydalsvik; Schuler, Raphael; Einarsrud, Mari-Ann; Pryds, Nini; Wiik, Kjell (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    The present challenge with all-oxide thermoelectric modules is their poor durability at high temperatures caused by the instability of the metal-oxide interfaces at the hot side. This work explains a new module concept ...
  • TiO2 as a Photocatalyst for Water Splitting—An Experimental and Theoretical Review 
    Eidsvåg, Håkon; Bentouba, Said; Vajeeston, Ponniah; Shivatharsiny, Yohi; Velauthapillai, Dhayalan (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Abstract: Hydrogen produced from water using photocatalysts driven by sunlight is a sustainable way to overcome the intermittency issues of solar power and provide a green alternative to fossil fuels. TiO2 has been used ...
  • Titration of Cu(I) Sites in Cu-ZSM-5 by Volumetric CO Adsorption 
    Deplano, Gabriele; Signorile, Matteo; Crocellà, Valentina; Porcaro, Natale Gabriele; Atzori, Cesare; Solemsli, Bjørn Gading; Svelle, Stian; Bordiga, Silvia (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Cu-exchanged zeolites are widely studied materials because of their importance in industrial energetic and environmental processes. Cu redox speciation lies at the center of many of these processes but is experimentally ...
  • Topology-guided polar ordering of collective cell migration 
    Lång, Emma Helena; Lång, Anna Ulrika; Blicher, Pernille; Rognes, Torbjørn; Dommersnes, Paul Gunnar; Bøe, Stig Ove (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
    The ability of epithelial monolayers to self-organize into a dynamic polarized state, where cells migrate in a uniform direction, is essential for tissue regeneration, development, and tumor progression. However, the ...
  • Total Scattering Study of Local Structural Changes in MnAs1-xPx Influenced by Magnetic Interactions 
    Saha, Dipankar; Kumar, Susmit; Gonano, Bruno Raymond Gino; Sjåstad, Anja Olafsen; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    The interplay between fluctuations of the local structure and magnetic interactions is of great importance for phenomena like superconductivity, colossal magnetoresistance, and frustrated magnetism. Such local distortions ...
  • Toward Atomistic Understanding of Materials with the Conversion–Alloying Mechanism in Li-Ion Batteries 
    Park, Heesoo; van Duin, Adri C. T.; Koposov, Alexey (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    The need for practical anodes for rechargeable batteries calls for new materials with improved storage capacity and cycling stability compared to the materials of today. Materials capable of alloying with alkali metals ...