Browsing Fakultet for naturvitenskap (NV) by Title
Now showing items 9165-9184 of 12453
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Quantum topological phase transitions in skyrmion crystals
(Peer reviewed; Journal article, 2022)Topological order is important in many aspects of condensed matter physics and has been extended to bosonic systems. In this Letter we report on the nontrivial topology of the magnon bands in two distinct quantum skyrmion ... -
Quantum transport and proximity effects in unconventional superconducting hybrid systems
(Doktoravhandlinger ved NTNU, 1503-8181; 2009:43, Doctoral thesis, 2009) This thesis presents some of the main findings from twenty-five research articles. These papers may roughly be categorized into three fields: i) Proximity structures of superconductors and ferromagnets, ii) Interplay ... -
Quantum Transport in Hybrid Structures
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:231, Doctoral thesis, 2013)This thesis presents the findings of four research papers on two topics in condensed-matter physics. Namely: i) The interplay between superconductivity and magnetism in Josephson junctions, and ii) current-driven domain ... -
Quark and Hybrid Stars with the Quark-Meson Model — Including Preliminaries to Compact Stars
(Master thesis, 2022)Ifølge kvantekromodynamikk bryter innesperrede kvarker fri fra hadroner til en tilstand av uavgrenset kvarkmaterie ved høy tetthet. Nylige observasjoner av de massive 2 M_☉-pulsarene PSR J1614-2230, PSR J0348+0432 og PSR ... -
Quark and pion condensates at finite isospin density in chiral perturbation theory
(Peer reviewed; Journal article, 2020)I denne artikkelen vurderer vi to-smak QCD ved null temperatur og endelig isospin kjemisk potensiale μJegμI ved hjelp av en modelluavhengig analyse innen chiral forstyrrelsesteori i neste ledende rekkefølge. Vi beregner ... -
Quark, Hybrid, and Unified Hybrid Stars with the Quark-Meson Model
(Master thesis, 2023)Vi beskriver kalde, sfærisk-symmetriske, kompakte stjerner med kvark-meson-modellen med to kvarker. Til å begynne med utleder vi relevante termodynamiske størrelser fra kvantefeltteori ved endelig kjemisk potensial. Vi ... -
The Quark-meson model in a magnetic field
(Master thesis, 2017)In this thesis we study the chiral phase transition of two-flavor QCD, through the use of the quark-meson model. The effect of a magnetic field on the transition is studied, at finite temperature and baryon chemical ... -
Quartz Behavior in Si Production
(Master thesis, 2013)The results of this study show the main findings in this work. The points are summarized as follow:1.With the temperature increased, many cracks formed inside the quartz. When the temperature was approaching melting point, ... -
Quasi-16-day period oscillations observed in middle atmospheric ozone and temperature in Antarctica
(Journal article; Peer reviewed, 2013)Nightly averaged mesospheric temperature derived from the hydroxyl nightglow at Rothera station (67°34' S, 68°08' W) and nightly midnight measurements of ozone mixing ratio obtained from Troll station (72°01' S, 2°32' E) ... -
Quasiclassical boundary conditions for spin-orbit coupled interfaces with spin-charge conversion
(Peer reviewed; Journal article, 2022)The quasiclassical theory of superconductivity provides a methodology to study emergent phenomena in hybrid structures comprised of superconductors interfaced with other materials. A key component in this theory is the ... -
Quasiclassical Theory Beyond 1D: Supercurrents and Topological Excitations
(Master thesis, 2016)The finite element method is used to solve the quasiclassical Usadel equation, valid for diffusive superconducting hybrid systems, in higher dimensions than one. A detailed derivation of the method is given, and it is ... -
Quasiclassical theory for antiferromagnetic metals
(Peer reviewed; Journal article, 2023)Unlike ferromagnetism, antiferromagnetism cannot readily be included in the quasiclassical Keldysh theory because of the rapid spatial variation in the directions of of the magnetic moments. The quasiclassical framework ... -
Quasiclassical Theory for Dirac Material/Superconductor Proximity Structures
(Master thesis, 2016)In the decade since the experimental discovery of graphene and the topological insulators, the field of Dirac materials, a new class of materials with linear low-energy dispersions, has attracted great research interest. ... -
Quasiclassical theory for interfaces with spin-orbit coupling
(Journal article; Peer reviewed, 2019)In recent years, substantial progress has been made regarding the application of quasiclassical theory on superconducting hybrid structures. This theoretical framework is reliant on a proper set of boundary conditions in ... -
Quasiclassical theory for the superconducting proximity effect in Dirac materials
(Journal article, 2017)We derive the quasiclassical non-equilibrium Eilenberger and Usadel equations to first order in quantities small compared to the Fermi energy, valid for Dirac edge and surface electrons with spin-momentum locking p· σ¯, ... -
Radiation dose and image quality in CT - Comparison and evaluation of two different organ-based tube current modulation techniques and their impact on organ dose and image noise
(Master thesis, 2019)Bakgrunn: Computertomografi (CT) -undersøkingar er eit mykje brukt vertøy i medisinsk dignostikk, og bruken aukar. Denne auka har først til auka uro over stråledosen pasientar blir utsett for. Det er viktig å optimalisere ... -
Radiation dose and image quality in CT - Evaluation of how slice thickness, tube current modulation and reconstruction algorithms affect radiation dose and image noise
(Master thesis, 2018)Background: Helse Vest has currently standardized the computed tomography (CT) Thorax/Abdomen/Pelvis protocols in the region. One of the standardized parameters was a reduction of the reconstructed slice thickness from 5 ... -
Radiation fields and viscous cosmology - Friction in General Relativity
(Master thesis, 2015)Certain aspects of the Lorentz transformation, sometimes called beaming, aberration or transverse Doppler effect, induce viscosity-like effects on extended objects moving through radiation fields. In this thesis, these ... -
Radiative corrections to van der Waals interaction in fluids
(Master thesis, 2012)The van der Waals interaction energy is derived for a homogenous fluid of polarizable particles. Low-temperature corrections to the van der Waals interaction energy are computed numerically for three cases: Dilute media ... -
Radiative forcing geoengineering causes higher risk of wildfires and permafrost thawing over the Arctic regions
(Journal article; Peer reviewed, 2024)Radiative forcing geoengineering is discussed as an intermediate solution to partially offset greenhouse gas-driven warming by altering the Earth’s energy budget. Here we use an Earth System Model to analyse the response ...