Browsing Institutt for fysikk by Title
Now showing items 1074-1093 of 2798
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HAADF-STEM and DFT investigations of the Zn-containing β'' phase in Al-Mg-Si alloys
(Journal article, 2014)The Zn-containing β″ phase in Al–Mg–Si alloys was investigated by aberration corrected high angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), combined with density functional theory (DFT) ... -
Handling Discontinuities in Numerical ODE Methods
(Master thesis, 2021)Et vanlig ønske i mange typer arbeid er å finne den fremgangsmåten som gir best resultat uten å kreve for mye innsats. For eksempel så krever modellering av hvordan forurensende stoffer sprer seg i havet at man beregner ... -
Hardness and Microstructure for Ge-Containing Al-Mg-Si-Cu alloys
(Master thesis, 2012)Four different Al-Mg-Si-Cu-Ge alloys with 0.002--0.037 at.\% germanium were heat treated to the T6 condition and over-aged at 250$^{\circ}$C for up to 100 hours. The hardness was tested during the over-ageing and there ... -
Harnessing thermoelectric power from transient heat sources: Waste heat recovery from silicon production
(Journal article; Peer reviewed, 2017)Thermoelectric generators (TEGs) are compact and robust devices for converting heat into electrical power. In this work, we investigate the response of a bismuth-telluride based TEG to the transient environment of a silicon ... -
Head-On Beam-Beam Interactions in High-Energy Hadron Colliders - GPU-Powered Modelling of Nonlinear Effects
(Master thesis, 2017)The performance of high-energy circular hadron colliders, as the Large Hadron Collider, is limited by beam-beam interactions. The strength of the beam-beam interactions will be higher after the upgrade to the High-Luminosity ... -
Heat Control in Composite Overwrapped Pressure Vessels: Modeling and Simulation Approaches
(Bachelor thesis, 2024)En composite overwraped pressure vessel fylt med nitrogengass på høyt trykk har blitt studert. Når tanken fylles, øker den indre energien til gassen, noe som igjen varmer opp tankveggen. Det ytterste vegglaget mister sin ... -
Heat Control in Composite Overwrapped Pressure Vessels: Modeling and Simulation Approaches
(Bachelor thesis, 2024)En composite overwraped pressure vessel fylt med nitrogengass på høyt trykk har blitt studert. Når tanken fylles, øker den indre energien til gassen, noe som igjen varmer opp tankveggen. Det ytterste vegglaget mister sin ... -
Heat Treatment of Mg-Containing Aluminum Alloys 5182 and 6016 in an Oxidizing Atmosphere with 4% CO2
(Peer reviewed; Journal article, 2022)Oxidation of liquid aluminum (Al) during processing is a widely known problem, and magnesium (Mg), as a common alloying element, increases the oxidation rate of the alloy. It has been established that small additions of ... -
HEPPA III Intercomparison Experiment on Electron Precipitation Impacts: 1. Estimated Ionization Rates During a Geomagnetic Active Period in April 2010
(Peer reviewed; Journal article, 2022)Precipitating auroral and radiation belt electrons are considered an important part of the natural forcing of the climate system. Recent studies suggest that this forcing is underestimated in current chemistry-climate ... -
Heppa III Intercomparison Experiment on Electron Precipitation Impacts: 2. Model-Measurement Intercomparison of Nitric Oxide (NO) During a Geomagnetic Storm in April 2010
(Peer reviewed; Journal article, 2022)Precipitating auroral and radiation belt electrons are considered to play an important part in the natural forcing of the middle atmosphere with a possible impact on the climate system. Recent studies suggest that this ... -
Heterogeneous nucleation and grain growth of inoculated aluminium alloys: An integrated study by in-situ X-radiography and numerical modelling
(Journal article; Peer reviewed, 2017)A comprehensive study on the heterogeneous nucleation and grain growth of Al-10 wt.%Cu alloys inoculated with Al-5Ti-1B was carried out. To further reveal the solute segregation stifling mechanism, in-situ near-isothermal ... -
Heterostructured GaAs/GaAsSb nanowires characterized by scanning precession electron microscopy
(Master thesis, 2020)III-V halvleder nanotråder kan være basisen for fremtidens optoelektroniske enheter. For å omptimalisere syntesen og egenskaper må strukturelle karakteristikker bestemmes. I denne oppgaven har krystall strukturen, orientering, ... -
Hidden correlation between absorption peaks in achiral carbon nanotubes and nanoribbons
(Journal article; Peer reviewed, 2018)In this paper we study the effect of absorption peak correlation in finite length carbonnanotubes and graphene nanoribbons. It is shown, in the orthogonalp-orbital tight-binding modelwith the nearest neighbor approximation, ... -
Hidden interplay of current-induced spin and orbital torques in bulk Fe3GeTe2
(Peer reviewed; Journal article, 2022)Low crystal symmetry of magnetic van der Waals materials naturally promotes spin-orbital complexity unachievable in common magnetic materials used for spin-orbit torque switching. Here, using first-principles methods, we ... -
High accuracy optical power measurements using silicon photodetectors as primary standards
(Master thesis, 2009) -
High capacity Mg batteries based on surface-controlled electrochemical reactions
(Journal article; Peer reviewed, 2018)Mg batteries are one of several new battery technologies expected to partially substitute lithium-based batteries in the future due to the lower cost and higher safety. However, the development of Mg batteries has been ... -
High concentration aqueous magnetic fluids: structure, colloidal stability, magnetic and flow properties
(Journal article; Peer reviewed, 2018)This paper is an in-depth analysis devoted to two basic types of water based magnetic fluids (MFs), containing magnetite nanoparticles with electrostatic and with electro-steric stabilization, both obtained by chemical ... -
High energy 2.1 micron short-pulsed fiber MOPA laser
(Master thesis, 2019)Denne master oppgaven er sammensatt av flere eksperimenter og numeriske modeller som sammen har ført til utviklingen av en ny kort-pulset, høy energi diode bassert Holmium "Master Oscillator Power Amplifier (MOPA)" laser ... -
High Energy Broadband Femtosecond Pulse Generation From Tm-doped Fiber MOPA
(Chapter, 2016)We report generation of high energy (up to 280 nJ), broadband (over 450 nm between 1.95 - 2.4 µm), 200 fs pulses at 2.1 W average power directly from a Tm-fiber MOPA laser. -
High energy radiation from Centaurus A
(Journal article; Peer reviewed, 2009)We calculate, for the nearest active galactic nucleus (AGN), Centaurus A (Cen A), the flux of high-energy cosmic rays (CR) and of accompanying secondary photons and neutrinos expected from hadronic interactions in the ...