Blar i Institutt for fysikk på tittel

Viser treff 378-397 av 2653

    • Closing of Micro-cavities in Well Cement upon Exposure to CO2 Brine 

      Chavez Panduro, Elvia Anabela; Torsæter, Malin; Gawel, Kamila; Bjørge, Ruben; Gibaud, Alain; Yang, Yi; Sørensen, Henning; Frykman, Peter; Kjøller, Claus; Breiby, Dag Werner (Journal article; Peer reviewed, 2017)
      Long-lasting cement plugging of wells is crucial for successful CO2 storage in underground reservoirs. It requires a profoundly improved understanding of the behavior of fractured cement under realistic subsurface conditions ...

    • Cluster Analysis of Multiparametric Magnetic Resonance Images of Rectal Cancer 

      Abrahamsen, Bendik Skarre (Master thesis, 2019)
      Sammendrag: Formål: Klyngeanalyse utført på funksjonelle magnetresonans (MR) bilder har blitt foreslått som en metode for å dele heterogene tumorvolum inn i mer homogene subvolum. Målet med denne studien er å undersøke ...

    • Clustering and Vacancy Behavior in High- and Low-Solute Al-Mg-Si Alloys 

      Wenner, Sigurd; Nishimura, Katsuhiko; Matsuda, Kenji; Matsuzaki, Teiichiro; Tomono, Dai; Pratt, Francis L.; Marioara, Calin Daniel; Holmestad, Randi (Journal article, 2014)
      The precipitate microstructure and vacancy distribution in Al-Mg-Si alloys with different amounts of solute and different heat treatments were investigated by transmission electron microscopy and muon spin relaxation ...

    • Clustering during Natural Aging and its Effect on Precipitation Hardening in Al-Mg-Si Alloys 

      Martinsen, Fredrik Aleksander (Master thesis, 2011)
      The effect of clustering during natural aging of three different Al-Mg-Sialloys with equal Mg/Si-ratios, but different Mg+Si contents have beenstudied through hardness measurements and transmission electron mi-croscopy ...

    • CO desorption from nickel-decorated muscovite mica 

      Hunvik, Kristoffer William Bø; Støvneng, Anna; Pacáková, Barbara; Raaen, Steinar (Journal article; Peer reviewed, 2019)
      Adsorption and desorption of CO from Ni nanostructures deposited on muscovite mica substrates have been studied by TPD and characterized by XPS and AFM. In agreement with previous reports it is found that CO does not adsorb ...

    • CO2 Adsorption Enhanced by Tuning the Layer Charge in a Clay Mineral 

      Hunvik, Kristoffer William Bø; Loch, Patrick; Wallacher, Dirk; Kirch, Alexsandro; Cavalcanti, Leide Passos; Rieß, Martin; Daab, Matthias; Josvanger, Vegard; Grätz, Sven; Yokaichiya, Fabiano; Knudsen, Kenneth Dahl; Miranda, Caetano Rodrigues; Breu, Josef; Fossum, Jon Otto (Peer reviewed; Journal article, 2021)
      Due to the compact two-dimensional interlayer pore space and the high density of interlayer molecular adsorption sites, clay minerals are competitive adsorption materials for carbon dioxide capture. We demonstrate that ...

    • CO2 adsorption on pure and oxidised Ni nano-structures deposited on mica surfaces 

      Hunvik, Kristoffer William Bø; Pacáková, Barbara; Raaen, Steinar (Peer reviewed; Journal article, 2020)
      Adsorption and desorption of CO2 on metallic and oxidised Ni nano-structures supported on mica (muscovite) substrates have been studied by temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS) and ...

    • CO2 Capture and Storage in Fluorohectorite Clay. Role of Pressure, Temperature and Interlayer Cation: XRD Studies 

      Konstanse Kvalem Seljelid (Master thesis, 2019)
      Som konsekvens av aukande CO2 utslepp i atmosfæren vert fleire teknologiar innanfor karbonfangst og lagring undersøkt. I denne samanhengen vert også leiremineral studert på grunn av deira evner til å absorbere CO2, i tillegg ...

    • CO2 laser annealed SiGe core optical fibers with radial Ge concentration gradients 

      Wu, Wei; Balci, Mustafa H.; Song, Seunghan; liu, chunxin; Fokine, Michael; Laurell, Fredrik; Hawkins, Thomas A.; Ballato, John; Gibson, Ursula (Peer reviewed; Journal article, 2020)
      CO2 laser annealing of SiGe core, glass-clad optical fibers is a powerful technique for the production of single-crystal cores with spatially varying Ge concentrations. Laser power, laser scan speed and cooling air flow ...

    • Coating for Metal Bipolar Plates in PEM Water Electrolysers 

      Krakhella, Kjersti Sandvik (Master thesis, 2015)
      To increase the efficiency of hydrogen as an energy storage medium, this project's goal is to lower the cost of Proton Exchange Membrane Water Electrolysers (PEMWE) by decreasing the cost of the most expensive component: ...

    • Coherent and Correlated Spin Transport in Nanoscale Superconductors 

      Morten, Jan Petter (Doktoravhandlinger ved NTNU, 1503-8181; 2008:72, Doctoral thesis, 2008)
      Motivated by the desire for better understanding of nanoelectronic systems, we theoretically study the conductance and noise characteristics of current flow between superconductors, ferromagnets, and normal-metals. Such ...

    • Coherent octave-spanning mid-infrared supercontinuum generated in As2S3-silica double-nanospike waveguide pumped by femtosecond Cr:ZnS laser 

      Xie, Shangran; Tolstik, Nikolai; Travers, J.; Sorokin, Evgeni; Caillaud, Celine; Troles, Johann; Russell, Philip St.J.; Sorokina, Irina T (Journal article; Peer reviewed, 2016)
      A more than 1.5 octave-spanning mid-infrared supercontinuum (1.2 to 3.6 μm) is generated by pumping a As2S3-silica “double-nanospike” waveguide via a femtosecond Cr:ZnS laser at 2.35 μm. The combination of the optimized ...

    • Coherent Plane-Wave Compounding in Medical Ultrasound Imaging: Quality Investigation of 2D B-mode Images of Stationary and Moving Objects. 

      Øvland, Ragnhild (Master thesis, 2012)
      Coherent plane-wave compounding is the coherent summation of several successive plane waves incident at different angles. This thesis presents results from simulations and in vitro and in vivo measurements of stationary ...

    • Collective effects in low-dimensional systems with coupled quasiparticles 

      Thingstad, Even (Doctoral theses at NTNU;2021:279, Doctoral thesis, 2021)
      Many of the most fascinating and challenging phenomena in condensed matter physics occur in systems with coupling between quasiparticles of different nature. This thesis is concerned with the study of collective effects ...

    • Colloidal crystals as templates for light harvesting structures in solar cells 

      Haugan, Einar; Granlund, Håvard; Gjessing, Jo; Marstein, Erik Stensrud (Journal article; Peer reviewed, 2011)
      Monolayer colloidal crystals are formed using silica- and polystyrene beads and used as etch masks for the formation of regular, _m period hexagonal arrays of indentations in a silicon wafer. Such patterns can be used as ...

    • Colloidal Crystals as Templates for Light Harvesting Structures in Solar Cells 

      Haugan, Einar (Master thesis, 2011)
      Monolayer colloidal crystals are formed using silica- and polystyrene beads and used as templates in nanosphere lithography for creating various hexagonal periodic structures intended for light harvesting in crystalline ...

    • Coloured intermediate band solar cells 

      Ormaetxea Orobengoa, Joseba Miren (Master thesis, 2023)
      Masteroppgaven består av en grundig detaliert balanseanalyse av den maksimale effektomformingsgraden (PCE) som kan oppnås med fargede enkeltlags solceller (SJSCs) og solceller med mellombånd (IBSCs). Arbeidet er basert på ...

    • Combined experimental and theoretical study of acetylene semi-hydrogenation over Pd/Al <sub>2</sub> O <sub>3</sub> 

      Goncalves, Liliana PL; Wang, Jianguang; Vinati, Simone; Barborini, Emanuele; Wei, Xian-Kui; Heggen, Marc; Franco, Miguel; Sousa, Juliana PS; Petrovykh, Dmitri Y; Soares, Olívia Salomé Gonçalves Pinto; Kovnir, Kirill; Akola, Jaakko; Kolen'ko, Yury V (Peer reviewed; Journal article, 2019)
      The semi-hydrogenation of acetylene (C2H2 + H2 = C2H4, ΔH = −172 kJ mol−1) is a well-studied reaction that is important for purification of ethylene, C2H4, feed used in polyethylene production. Pd-based catalysts are most ...

    • A combined fluid-dynamic and thermodynamic model to predict the onset of rapid phase transitions in LNG spills 

      Lervåg, Karl Yngve; Skarsvåg, Hans Langva; Aursand, Eskil; Ouassou, Jabir Ali; Hammer, Morten; Reigstad, Gunhild Allard; Ervik, Åsmund; Fyhn, Eirik Holm; Gjennestad, Magnus Aashammer; Aursand, Peder; Wilhelmsen, Øivind (Peer reviewed; Journal article, 2020)
      Transport of liquefied natural gas (LNG) by ship occurs globally on a massive scale. The large temperature difference between LNG and water means LNG will boil violently if spilled onto water. This may cause a physical ...

    • Combined RBE and OER optimization in proton therapy with FLUKA based on EF5-PET 

      Henjum, Helge; Dahle, Tordis Johnsen; Mairani, Andrea; Pilskog, Sara Margareta Cecilia; Stokkevåg, Camilla Hanquist; Boer, Camilla Grindeland; Redalen, Kathrine Røe; Minn, Heikki; Malinen, Eirik; Ytre-Hauge, Kristian Smeland (Peer reviewed; Journal article, 2023)
      Introduction Tumor hypoxia is associated with poor treatment outcome. Hypoxic regions are more radioresistant than well-oxygenated regions, as quantified by the oxygen enhancement ratio (OER). In optimization of proton ...