Browsing Institutt for fysikk by Issue Date
Now showing items 461-480 of 2677
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Anomalous domain wall velocity and Walker breakdown in hybrid systems with anisotropic exchange
(Journal article; Peer reviewed, 2013)It has recently been proposed that spin-transfer torques in magnetic systems with anisotropic exchange can be strongly enhanced, reducing the characteristic current density with up to four orders of magnitude compared to ... -
Experimental Studies of Catalytic Properties of Gold Nanostructures on Ruthenium Substrate
(Master thesis, 2013)This study presents and investigates gold nanostructures on a ruthenium substrate by experimental techniques, such as X-ray photoelectron spectroscopy (XPS), low-energy electron diffraction (LEED) and temperature-programmed ... -
Characterisation of quantum dot-intermediate band solar cells with optical spectroscopy
(Master thesis, 2013)This report describes the development of a photoreflectance (PR) technique in order to study InAs/GaAs quantum dots-based intermediate band solar cells (QD-IBSC). The motivation for this study, is that PR has previously ... -
Muon kinetics in heat treated Al (–Mg)(–Si) alloys
(Journal article, 2013)Al–Mg–Si alloys are heat-treatable and rely on precipitation hardening for their mechanical strength. We have employed the technique of muon spin relaxation to further our understanding of the complex precipitation sequence ... -
Numerical studies of Supernova Remnants
(Master thesis, 2013)Supernovae are very luminous events, on the scale of entire galaxies, and deposit mass and large amounts of energy in to the surrounding interstellar medium. In this workthe effect of a supernova on the surrounding medium ... -
Kalman filters applied to target tracking with multiple sensors
(Master thesis, 2013)The objective of this master thesis is to look at an air surveillance system with the ability to integrate observations from multiple radars. A fictional plane is detected by the system, and the goal is to estimate the ... -
Chirality-sensitive domain wall motion in spin-orbit coupled ferromagnets
(Journal article; Peer reviewed, 2013)Using the Lagrangian formalism, we solve analytically the equations of motion for current-induced domain wall dynamics in a ferromagnet with Rashba spin-orbit coupling. An exact solution for the domain wall velocity is ... -
From Rock Scissor Paper to study and modeling of Chinese Five Elements: Evolutionary Game Theory
(Master thesis, 2013)In this thesis, we have developed a model to study the behavior of an extended version of evolutionary game "Rock-Scissor-Paper", that is "Five Elements". The origin of five elements are from "Chinese five elements" in ... -
Numerical Modelling of the Optical Properties of Truncated and Coated Prolate Spheroidal Nanoparticles
(Master thesis, 2013)The optical properties of an island film of truncated and coated prolate spheroidal particles are studied numerically by implementing support for this island geometry in the GranFilm software. The underlying theory of the ... -
Technical Aspects of Ion Milling and Electron Imaging of Epoxy Embedded Samples for FIB/SEM Tomography
(Master thesis, 2013)FIB/SEM tomography is a relatively new imaging technique for 3D investigation of biological tissue. It uses a dualbeam FIB/SEM instrument to alternately image a sample surface with an electron beam and mill off successive ... -
Microscopical Characterization of Metal-Coated Polymer Microspheres under Mechanical Compression
(Master thesis, 2013)We have performed compression experiments on both metal-coated and uncoated resorcinol-formaldehyde polymer microspheres by a experimental setup developed in-house. Through images obtained from optical microscopy, the ... -
Enhancement and shape control of weak molecular absorption signal with chirped-pulse mid-IR lasers
(Chapter, 2013)Detection of weak narrowband absorption by molecular lines is usually a topic of linear-optical technology. In this paper we demonstrate nonlinear-optical enhancement and shape control of atmospheric absortion lines using ... -
5 W Supercontinuum Generation at 1.9-2.5 μm from a Tm-Doped All-Fiber MOPA Laser
(Chapter, 2013)We report a simple method of generating flat-top high power (5W) supercontinuum from an all-silica-fiber Tm-MOPA laser emitting in the interesting for applications 1.96-2.48 μm range (at -5 dB level), covering transparency ... -
Active structuring of colloidal armour on liquid drops
(Journal article; Peer reviewed, 2013)Adsorption and assembly of colloidal particles at the surface of liquid droplets are at the base of particle-stabilized emulsions and templating. Here we report that electrohydrodynamic and electro-rheological effects ... -
Neutron Stars: The electromagnetic forces at the surface and its implications.
(Master thesis, 2013)A neutron star is a compact object formed in a core-collapse supernova explosion or in an accretion process of a white dwarf. Its radius is of the order of tens of kilometers and its mass on the order of one solar mass. ... -
The Diffuse Synchrotron Radio Background from Normal Spiral Galaxies in the Context of the ARCADE Excess
(Master thesis, 2013)In this thesis, the possibility that synchrotron radiation from cosmic ray electrons in normal spiral galaxies can account for the ARCADE excess is investigated. The ARCADE excess is an excess flux measured in the sky ... -
On the terms violating the custodial symmetry in multi-Higgs-doublet models
(Journal article; Peer reviewed, 2013)We prove that a generic multi-Higgs-doublet model (NHDM) generally must contain terms in the potential that violate the custodial symmetry. This is done by showing that the O(4) violating terms of the NHDM potential cannot ... -
Hyperspectral analysis using the correlation between image and reference
(Journal article; Peer reviewed, 2013)We present the use of correlation analysis on spectral data in order to quantify the amount of a given spectrum present with respect to a reference spectrum. The method is shown to be useful in analyzing hyperspectral ... -
Asymmetric ferromagnetic resonance, universal Walker breakdown, and counterflow domain wall motion in the presence of multiple spin-orbit torques
(Journal article; Peer reviewed, 2013)Measurement of the maximum blood flow velocity is the primary means for determining the degree of carotid stenosis using ultrasound. The current standard for estimating the maximum velocity is Pulsed Wave (PW) Doppler with ...