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A Numerical Study of Transient Friction and Transient Friction Modelling in Ramp-up and Ramp-down Flow Conditions Similar to Pump Ramp-up and Valve Closure in Gas Transport Pipelines
(Master thesis, 2014)When gas is transported in long pipelines, computational models are used as tools to plan and to optimize hydraulic capacities. Because of the length of the pipelines the models are mostly one-dimensional (1D) which in ... -
Traveling planetary wave activity from mesopause region airglow temperatures determined by the Network for the Detection of Mesospheric Change (NDMC)
(Journal article; Peer reviewed, 2014)The global distribution of traveling planetary wave (PW) activity in the mesopause region is estimated for the first time from ground-based airglow measurements. Monthly and total mean climatologies of PW power are determined ... -
Silicon-core glass fibres as microwire radial-junction solar cells
(Journal article; Peer reviewed, 2014)Vertically aligned radial-junction solar cell designs offer potential improvements over planar geometries, as carrier generation occurs close to the junction for all absorption depths, but most production methods still ... -
Computer Controlled Dispersion Measurements and Investigation of New Optical Fibers
(Master thesis, 2014)A dispersion measurement setup for short length fibers based on Mach Zehnder interferometer was automatized and tested using standard telecommunication fiber. This setup is based on low coherence sources which enable ... -
Bulk fabrication and properties of solar grade silicon microwires
(Journal article; Peer reviewed, 2014)We demonstrate a substrate-free novel route for fabrication of solar grade silicon microwires for photovoltaic applications. The microwires are fabricated from low purity starting material via a bulk molten-core fibre ... -
6.8 W all-fiber supercontinuum source at 1.9-2.5 um
(Journal article; Peer reviewed, 2014)We report a simple method of generating a spectrally flat and high average power spectral density (up to 14 mW/nm) optical supercontinuum in the 1.95–2.5 μm range covering a transparency window of the atmosphere. The ... -
X-ray absorption, X-ray diffraction and electron microscopy study of spent cobalt based catalyst in semi-commercial scale Fischer-Tropsch synthesis
(Peer reviewed; Journal article, 2014)Calcined, reduced and spent Co-Re/γ-Al2O3 catalysts for Fischer–Tropsch synthesis (FTS) were characterized and compared. Co-K-edge and Re-LIII-edge X-ray absorption near edge structure (XANES), X-ray powder diffraction ... -
Transmission electron microscopy and muon spin relaxation studies of precipitation in Al–Mg–Si alloys
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:1, Doctoral thesis, 2014)The Al–Mg–Si system is a heat-treatable class of aluminium alloys that gain their mechanical strength via precipitation hardening. The main hardening phases are precipitated as needle-shaped nano-sized particles from a ... -
Controlling the quantum state of light and matter with cavity QED
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:236, Doctoral thesis, 2014)Experimental progress in atomic, molecular and optical physics, at the quantum level, as well as in condensed matter physics, has over the last few decades allowed us to not only observe quantum phenomena in nature, but ... -
The Effect of Trace Elements on Precipitation in Al-Mg-Si alloys - A Transmission Electron Microscopy Study
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:171, Doctoral thesis, 2014)Atomic scale studies of aluminum alloys The thesis focuses on structural analysis of particles (precipitates) in the important aluminum alloys – Al-Mg-Si alloys, studied by transmission electron microscopy (TEM) including ... -
Transmission electron microscopy studies of dispersoids and constituent phases in Al-Mn-Fe-Si alloys
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:239, Doctoral thesis, 2014)3xxx aluminium alloys are used among others in packaging, architectural applications and heat exchangers. Both dispersoids and constituent phases are very important in this alloy system. The size and distribution of the ... -
Metabolic and Histopathological characterization of Prostate cancer
(Master thesis, 2014)Prostatakreft er en av hovedårsakene til kreftrelaterte dødsfall i verden. Fremskritt i kunnskap om denne sykdommen kan bidra til å forbedre utfallet av sykdommen hos pasienter. Biomarkører kan forbedre detekteringen kreften ... -
Cr-doped ZnS for Intermediate Band Solar Cells
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:274, Doctoral thesis, 2014)Intermediate band solar cells (IBSCs) can potentially be highly efficient solar cells. This thesis presents the growth and characterization of highly doped chromium doped zinc sulfide (Cr:ZnS) films for use in IBSCs. The ... -
Currents in AC stressed liquid insulated needle plane gap
(Chapter, 2014)Currents and space charge phenomena in 8 different dielectric liquids have been investigated for an ac stressed needle plane gap. Applied frequencies ranged from 0.1 Hz to 100 Hz. A high resolution analogue-digital converter ... -
In situ hard X-ray ptychographic imaging for materials science
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:244, Doctoral thesis, 2014)With the ability to control the structure of multiphase materials for applications on the nano- and mesoscale, methods for imaging these materials are becoming increasingly important. Especially techniques able to image ... -
Polarimetric and hyperspectral imaging methods for characterisation of bio- and nanomaterials
(Doktoravhandlinger ved NTNU, 1503-8181; 2014:238, Doctoral thesis, 2014)Presented here is the development of a time gated Raman spectrometer, a new method for designing polarimeters, testing of an overdetermined Mueller matrix imaging ellipsometer and Mueller matrix imaging of collagen fibre ... -
Fracture networks in sea ice
(Journal article; Peer reviewed, 2014-04-16)Fracturing and refreezing of sea ice in the Kara sea are investigated using complex network analysis. By going to the dual network, where the fractures are nodes and their intersections links, we gain access to topological ... -
Solid solubility of rare earth elements (Nd, Eu, Tb) in In2−xSnxO3 – effect on electrical conductivity and optical properties
(Journal article; Peer reviewed, 2014-05-07)Wide band-gap semiconductors doped with luminescent rare earth elements (REEs) have attracted recent interest due to their unique optical properties. Here we report on the synthesis of the transparent conducting oxides ... -
Film flow dominated simultaneous flow of two viscous incompressible fluids through a porous medium
(Journal article; Peer reviewed, 2014-11-19)We present an experimental study of two-phase flow in a quasi-two-dimensional porous medium. The two phases, a water-glycerol solution and a commercial food grade rapeseed/canola oil, having an oil to water-glycerol viscosity ... -
Observational evidence of the influence of Antarctic stratospheric ozone variability on middle atmosphere dynamics
(Journal article; Peer reviewed, 2015)Modeling results have suggested that the circulation of the stratosphere and mesosphere in spring is strongly affected by the perturbations in heating induced by the Antarctic ozone hole. Here using both mesospheric MF ...