Browsing Institutt for fysikk by Issue Date
Now showing items 801-820 of 2680
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Seeing a Mycobacterium-Infected Cell in Nanoscale 3D: Correlative Imaging by Light Microscopy and FIB/SEM Tomography
(Journal article; Peer reviewed, 2015)Mycobacteria pose a threat to the world health today, with pathogenic and opportunistic bacteria causing tuberculosis and non-tuberculous disease in large parts of the population. Much is still unknown about the interplay ... -
A Monte Carlo Study of the Criticality of the 3D XY Model
(Master thesis, 2015)In this master thesis the criticality of the 3D XY model with cubic anisotropy has been examined by the means of Monte Carlo simulation. The 3D XY model is a special case of the $O(n)$ spin-vector model which describe ... -
Novel imaging technologies for characterization of microbial extracellular polysaccharides
(Journal article; Peer reviewed, 2015)Understanding of biology is underpinned by the ability to observe structures at various length scales. This is so in a historical context and is also valid today. Evolution of novel insight often emerges from technological ... -
Analysis and Simulation of Intermediate Band Solar Cells
(Master thesis, 2015)Intermediate band solar cells (IBSC) is a technology that promises higher efficiency solar cells with comparatively simpler structure than the currently best performing solar cells on the market. In this work, different ... -
Band gaps in jagged and straight graphene nanoribbons tunable by an external electric field
(Journal article; Peer reviewed, 2015)Band gap control by an external field is useful in various optical, infrared and THz applications. However, widely tunable band gaps are still not practical due to a variety of reasons. Using the orthogonal tight-binding ... -
Femtosecond Cr2+-based lasers
(Journal article; Peer reviewed, 2015)We review a novel class of femtosecond Cr2+-doped ZnSe and ZnS lasers, which operates in a very important for applications wavelength range between 2 and 3.5 μm and which generates ultrashort optical pulses that are only ... -
Permeability, Growth and Morphology of Coastal Ice - Site Study in Van Mijenfjorden, Svalbard
(Master thesis, 2015)Coastal ice includes the parts of the sea ice that are stressed and deformed by tidal motion; the ice foot (the inner part that is frozen to the ground) and the hinge zone (the zone where cracking occurs due to tidal ... -
Fundamental formulae for wave-energy conversion
(Journal article; Peer reviewed, 2015)The time-average wave power that is absorbed, from an incident wave, by means of a wave energy conversion (WEC) unit, or by an array of WEC units--i.e. oscillating immersed bodies and/or OWCs--may be mathematically expressed ... -
Phase transitions in low dimensional systems via spontaneous symmetry breaking and topology
(Doctoral thesis at NTNU;2015:271, Doctoral thesis, 2015)In nature there exists a fundamental distinction among particles regarding their statistics. Let us consider an isolated systems of two particles: two bosons are allowed to stay in the same physical state while two fermions ... -
Light trapping in horizontally aligned silicon microwire solar cells
(Journal article; Peer reviewed, 2015)In this study, we demonstrate a solar cell design based on horizontally aligned microwires fabricated from 99.98% pure silicon via the molten core fiber drawing method. A similar structure consisting of 50 μm diameter close ... -
Dynamic Wettability Alteration in Immiscible Two-phase Flow in Porous Media: Effect on Transport Properties and Critical Slowing Down
(Journal article; Peer reviewed, 2015)The change in contact angles due to the injection of low salinity water or any other wettability altering agent in an oil-rich porous medium is modeled by a network of disordered pores transporting two immiscible fluids. ... -
Swelling Dynamics of a DNA-Polymer Hybrid Hydrogel Prepared Using Polyethylene Glycol as a Porogen
(Peer reviewed; Journal article, 2015)DNA-polyacrylamide hybrid hydrogels designed with covalent and double-stranded (dsDNA) crosslinks respond to specific single-stranded DNA (ssDNA) probes by adapting new equilibrium swelling volume. The ssDNA probes need ... -
Optical Properties of Silicon Microwire Arrays for Photovoltaic Applications
(Master thesis, 2015)Silicon microwire-based solar cells represent a potential design strategy to reduce wafer related costs through reduced material usage and relaxed purity requirements. In this work we investigate the absorption of incident ... -
Drivers of the high frequency variability of gravity wave forcing in the mesosphere and lower thermosphere
(Master thesis, 2015)In this thesis the influence of gravity waves (GWs) in the mesosphere/lower thermosphere (MLT) was analysed. This was inspired by the work done in the paper by de Wit et al. (2014), which used the SKiYMET meteor radar in ... -
Integration of Time Shift Data and Acoustic Impedance - And Complex Time-Lapse Imaging
(Master thesis, 2015)This thesis consists of several projects related to time-lapse seismic data from the Norne field. For the first part of this thesis, I have investigated methods for integration of the time shift data and the seismic ... -
Modelling of heat transport in two-phase flow and of mass transfer between phases using the level-set method
(Journal article; Peer reviewed, 2015)We describe mathematical models for heat transport and for mass transfer between phases due to vaporization and condensation. These models have been implemented in a framework for detailed two-phase flow calculations based ... -
Surface and bulk properties of chromium oxide: Implications for reduction by methane
(Journal article; Peer reviewed, 2015)A computational method for Cr2O3 and Cr3C2 has been established based on a systematic investigation of functionals, basis sets and corrections for dispersion, self-interaction and relativistic effects. The suggested method ... -
Josephson effect through magnetic skyrmions
(Journal article; Peer reviewed, 2015)We discover that the multiple degrees of freedom associated with magnetic skyrmions—size, position, and helicity—can all be used to control the Josephson effect and 0 − π transitions occurring in superconductor/magnetic ... -
Pulsed laser ablation and deposition of ZnS:Cr
(Journal article; Peer reviewed, 2015)We present a method to deposit films with a range of doping concentrations/dilute alloys, from a single target in pulsed laser deposition (PLD). Cr-doped ZnS films were deposited by ablating a target consisting Cr particles ... -
The effect of Cu and Ge additions on strength and precipitation in a lean 6xxx aluminium alloy
(Journal article; Peer reviewed, 2015)It has been demonstrated that the strength loss in a lean Al-Mg-Si alloy due to solute reduction could be compensated by back-adding a lower at % of Ge and Cu. Nanosized precipitate needles which are the main cause of ...