Now showing items 652-671 of 1817

    • Gamma-ray counterpart of the IceCube neutrinos 

      Kachelriess, Michael; Neronov, Andrii Yu.; Semikoz, Dimitry V. (Journal article; Peer reviewed, 2019)
      A γ-ray excess at high Galactic latitudes starting at energies 300 GeV was recently discovered in the data of the Fermi telescope. The multi-TeV γ-ray emission found has spectral characteristics at both low and high Galactic ...
    • Gamma-ray counterparts of 2WHSP high-synchrotron-peaked BL Lac objects as possible signatures of ultra-high-energy cosmic ray emission 

      Toomey, Michael; Oikonomou, Foteini; Murase, Kohta (Peer reviewed; Journal article, 2020)
      We present a search for high-energy γ-ray emission from 566 Active Galactic Nuclei at redshift z > 0.2, from the 2WHSP catalogue of high-synchrotron peaked BL Lac objects with 8 yr of Fermi-LAT data. We focus on a redshift ...
    • Gauge Dependence of the Quantum Field Theory Effective Potential 

      Andreassen, Anders Johan (Master thesis, 2013)
      Using the absolute stability requirement of the Standard Model vacuum, we compute the Higgs mass bound for the 1-loop Standard Model effective potential with gauge dependence in the $R_\xi$ gauges together with 3-loop beta ...
    • Ge-capped SiGe core optical fibers 

      Wu, Wei; Balci, Mustafa H.; Muhlberger, Korbinian; Fokine, Michael; Laurell, Fredrik; Hawkins, Thomas A.; Ballato, John; Gibson, Ursula (Journal article; Peer reviewed, 2019)
      CO2 laser processing offers the possibility to inscribe structures within glass-clad SiGe-core fibers by altering the spatial distribution of the Si and Ge. Spatial segregation of Ge to the end of a fiber is shown via ...
    • Gelling kinetics and in situ mineralization of alginate hydrogels: A correlative spatiotemporal characterization toolbox. 

      Åslund, Andreas; Bassett, David; Ucar, Seniz; Sikorski, Pawel; Andreassen, Jens-Petter; Mandaric, Stefan; Bjørnøy, Sindre Hove; Strand, Berit Løkensgard (Journal article; Peer reviewed, 2016)
      Due to their large water content and structural similarities to the extracellular matrix, hydrogels are an attractive class of material in the tissue engineering field. Polymers capable of ionotropic gelation are of special ...
    • General boundary conditions for quasiclassical theory of superconductivity in the diffusive limit: Application to strongly spin-polarized systems 

      Eschrig, Matthias; Cottet, Audrey; Belzig, W; Linder, Jacob (Journal article; Peer reviewed, 2015)
      Boundary conditions in quasiclassical theory of superconductivity are of crucial importance for describing proximity effects in heterostructures between different materials. Although they have been derived for the ballistic ...
    • General bulk-viscous solutions and estimates of bulk viscosity in the cosmic fluid 

      Normann, Ben David; Brevik, Iver Håkon (Journal article; Peer reviewed, 2016)
      We derive a general formalism for bulk viscous solutions of the energy-conservation equation for ρ(a,ζ) ρ(a,ζ) , both for a single-component and a multicomponent fluid in the Friedmann universe. For our purposes, these ...
    • General solution of 2D and 3D superconducting quasiclassical systems: Coalescing vortices and nanoisland geometries 

      Amundsen, Morten; Linder, Jacob (Journal article; Peer reviewed, 2016)
      An extension of quasiclassical Keldysh-Usadel theory to higher spatial dimensions than one is crucial in order to describe physical phenomena like charge/spin Hall effects and topological excitations like vortices and ...
    • Geometric Aspects of Quantum Entanglement 

      Hansen, Leif Ove (Doctoral thesis at NTNU;2016:253, Doctoral thesis, 2016)
      Summary: Entanglement is a strange feature contained in the quantum mechanical framework, first observed theoretically by Erwin Schrödinger and Albert Einstein. An inherent attribute of entanglement is non-locality, and ...
    • Giant triplet proximity effect in π-biased Josephson junctions with spin-orbit coupling 

      Jacobsen, Sol; Linder, Jacob (Journal article, 2015)
      In diffusive Josephson junctions the phase difference φ between the superconductors strongly influences the spectroscopic features of the layer separating them. The observation of a uniform minigap and its phase modulation ...
    • Gigahertz Femtosecond Cr:ZnS Laser 

      Tolstik, Nikolai; Evgeni, Sorokin; Sorokina, Irina T. (Chapter, 2014)
      We demonstrate the first Cr:ZnS laser with a gigahertz pulse repetition rate. The passively mode-locked by the graphene-based mirror laser provides 105 mW output power with 180 fs pulse duration and 110 pJ pulse energy.
    • Gold and Platinum Surface Nanostructures on Highly Oriented Pyrolytic Graphite 

      Karlsen, Terje Kultom (Master thesis, 2012)
      Self-assembled platinum and gold nanostructures, which are formed by evaporation and subsequent diffusion limited aggregation of metal on highly oriented pyrolytic graphite, have been studied by photoemission spectroscopy ...
    • Gold Nanostructures on Graphite 

      Espeland, Erlend (Master thesis, 2013)
      Gold nanoparticles supported on a graphite substrate are prepared by thermal evaporation, and subsequently studied by X-ray photoelectron spectroscopy (XPS), temperature programmed desorption (TPD) of carbon monoxide and ...
    • Goldstone bosons at finite density - Study of spontaneous symmetry breaking in O(N)-symmetric theories at finite chemical potential 

      Sanchez Garcia, Alfredo Ignacio (Master thesis, 2017)
      Goldstone s theorem states that, in presence of Lorentz invariance, the number of massless modes that appear after spontaneous symmetry breaking coincides with the number of broken generators. These modes are called Goldstone ...
    • GPU-Accelerated Visualization of Scattered Point Data 

      Falch, Thomas Løfsgaard; Fløystad, Jostein Bø; Breiby, Dag Werner; Elster, Anne C. (Journal article; Peer reviewed, 2013)
      As data sets continue to grow in size, visualization has become a vitally important tool for extracting meaningful knowledge. Scattered point data, which are unordered sets of point coordinates with associated measured ...
    • Grain boundary structures and their correlation with intergranular corrosion in an extruded Al-Mg-Si-Cu alloy 

      Lervik, Adrian; Wenner, Sigurd; Lunder, Otto; Marioara, Calin Daniel; Holmestad, Randi (Peer reviewed; Journal article, 2020)
      A detailed analysis of grain boundaries in a highly textured Al-Mg-Si-Cu alloy is presented in this work. Electron backscatter diffraction demonstrates the presence of three main categories of grain boundaries in addition ...
    • Graphene mode-locked Cr: ZnS chirped-pulse oscillator 

      Tolstik, Nikolai; Pospischil, Andreas; Sorokin, Evgeni; Sorokina, Irina T (Journal article; Peer reviewed, 2014)
      We report the first to our knowledge high-energy graphene mode-locked solid-state laser operating in the positive dispersion regime. Pulses with 15.5 nJ energy and 42 nm spectral bandwidth with 0.87 ps duration were obtained ...
    • Graphene Mode-locked Cr:ZnS Laser with 41 fs Pulse Duration 

      Tolstik, Nikolai; Sorokin, Evgeni; Sorokina, Irina T (Journal article; Peer reviewed, 2014)
      We report the ultrashort-pulse Cr:ZnS laser mode-locked by graphene-based saturable absorber mirror. Using the combination of bulk material and a chirped mirror, we demonstrate the shortest reported so far mid-IR pulses ...
    • Graphene mode-locked Cr:ZnS laser with 44 fs pulse duration 

      Tolstik, Nikolai; Pospischil, Andreas; Sorokin, E.; Sorokina, Irina T (Chapter, 2013)
      The first Cr:ZnS laser mode-locked by graphene-based saturable absorber mirror generates the shortest reported so far mid-IR pulses of only 5.5 optical cycles (44 fs) at 2.35 μm with 139 nm spectral bandwidth.
    • Graphene Saturable Absorber Mirrors for 2-3 μm Lasers 

      Lee, Cherrie Sue Jing (Master thesis, 2018)
      This thesis is devoted to the development of graphene saturable absorber mirrors for ultrafast applications in the mid-infrared. It covers from the fabrication of the graphene saturable absorber mirrors via graphene transfer ...