### Recent Submissions

• #### Mesoscale ionospheric plasma irregularities and scintillation over Svalbard ﻿

(The University of Bergen, 2016-10-21)
This thesis investigates how navigation signals are compromised by ionospheric plasma irregularities in the auroral and polar ionosphere over Svalbard. In 2013, four multiconstellation global navigation satellite system ...
Doctoral thesis
• #### Scintillation and irregularities from the nightside part of a Sun-aligned polar cap arc ﻿

(American Geophysical Union, 2016-06-18)
In this paper we study the presence of irregularities and scintillation in relation to the nightside part of a long-lived, Sun-aligned transpolar arc on 15 January 2015. The arc was observed in DMSP UV and particle data ...
Journal article
• #### Severe and localized GNSS scintillation at the poleward edge of the nightside auroral oval during intense substorm aurora ﻿

(American Geophysical Union, 2015-12)
In this paper we study how GPS, GLONASS, and Galileo navigation signals are compromised by strong irregularities causing severe phase scintillation (σϕ>1) in the nightside high-latitude ionosphere during a substorm on 3 ...
Journal article
• #### Temporal characteristics and energy deposition of pulsating auroral patches ﻿

(Wiley, 2016-07-23)
We present a careful statistical analysis of pulsating aurora (PA) using all-sky green line (557.7 nm) images obtained at 3.3 Hz. Six well-defined individual PA patches are identified and extracted using a contouring ...
Journal article
• #### Ionization dynamics beyond the dipole approximation induced by the pulse envelope ﻿

(American Physical Society, 2016-05)
When atoms and molecules are ionized by laser pulses of finite duration and increasingly high intensities, the validity of the much-used dipole approximation, in which the spatial dependence and magnetic component of the ...
Journal article
• #### The global potential for carbon capture and storage from forestry ﻿

(Springer, 2016-02-26)
Background: Discussions about limiting anthropogenic emissions of CO2 often focus on transition to renewable energy sources and on carbon capture and storage (CCS) of CO2. The potential contributions from forests, forest ...
Journal article
• #### Spectral albedo and transmittance of thin young Arctic sea ice ﻿

(Wiley, 2016-01)
Spectral albedo and transmittance in the range 400–900nm were measured on three separate dates on less than 15 cm thick new Arctic sea ice growing on Kongsfjorden, Svalbard at 78:9°N, 11:9°E. Inherent optical properties, ...
Journal article
• #### Power budget equations and calibration factors for fish abundance estimation using scientific echo sounders and sonar systems ﻿

(MDPI, 2016-07-09)
Acoustic methods used in fish abundance estimation constitute a key part of the analytic assessment that makes the basis for abundance estimation of marine resources. The methods rely on power-budget equations and calibrated ...
Journal article
• #### Searching for Dark Matter with the ATLAS and CTA Experiments ﻿

(The University of Bergen, 2016-06-23)
The existence of dark matter has been inferred by several experiments through measurements of its gravitational effects. However, dark matter has not been observed directly, meaning that we do not know what it is made of. ...
Doctoral thesis
• #### On the composite response of the MLT to major sudden stratospheric warming events with elevated stratopause ﻿

(Wiley, 2016-05)
Based on a climate-chemistry model (constrained by reanalyses below ~50 km), the zonal-mean composite response of the mesosphere and lower thermosphere (MLT) to major sudden stratospheric warming events with elevated ...
Journal article
• #### Study of the flow in a hydrocyclone using positron emission particle tracking and computational fluid dynamics simulation ﻿

(The University of Bergen, 2016-06-22)
This thesis presents my work of studying the flow in a hydrocyclone using positron emission particle tracking (PEPT) and computational fluid dynamics (CFD) simulation. Hydrocyclone separators are a type of cyclone separators ...
Doctoral thesis
• #### Numerical Study of the “End of the Vortex” Phenomenon in a Hydrocyclone Separator ﻿

(AIP, 2011)
The single‐phase flow field in a hydrocyclone was studied numerically using the LES turbulence model. The hydrocyclone geometry and flow conditions are in accordance with previous experimental work. An important phenomenon ...
Journal article
• #### Heterogeneous Hydrate Nucleation on Calcite {1014} and Kaolinite {001} Surfaces: A Molecular Dynamics Simulation Study ﻿

(The University of Bergen, 2016-06-01)
Natural gas hydrates are of significant interest due to the great amount of methane that can potentially be utilised as an energy source. These methane resources are trapped in ice-like form, which is a concern ...
Master thesis
• #### Search for lepton flavour violating $H\rightarrow\mu\tau$ Higgs decays at 13 TeV ﻿

(The University of Bergen, 2016-06-01)
Master thesis
• #### Vented gas and dust explosions - External explosions ﻿

(The University of Bergen, 2016-06-01)
The use of explosion venting is a widely applied safety measure, mitigating the effects of an internal gas and dust explosion. Implementation of this safety measure does however not eliminate all risks and hazards associated ...
Master thesis
• #### Development of a Transmitter for High Temperature Ultrasound Imaging ﻿

(The University of Bergen, 2016-06-01)
This thesis presents the development and testing of a new transmitter in an ultrasound imaging tool used for imaging the inside of oil wells in temperatures of up to 180 degrees Celsius. The imaging tool can have up to ...
Master thesis
• #### An Experimental Study of Foam Flow in Fractured Systems of Increasing Size ﻿

(The University of Bergen, 2016-06-01)
Although use of foam for gas mobility control is substantially covered in literature, large- scale field implementation is still absent in fractured reservoirs. Current understanding of foam behavior in fractured systems ...
Master thesis
• #### Polymer Enhanced Foam in Unconsolidated Sand ﻿

(The University of Bergen, 2016-06-01)
Foam is an EOR technique that significantly can improve the macroscopic sweep efficiency by lowering the gas mobility. Limited stability of conventional surfactants for foam generation is one of the reasons why foam is not ...
Master thesis
• #### New Phenomenological Constraints on the Gaugino Mediation Model ﻿

(The University of Bergen, 2016-05-31)
In this thesis, phenomenological consequences of the Gaugino Mediation model for SUSY breaking are explored. First, the very important trilinear coupling is proven to exist in Gaugino Mediation. Then, the parameter space ...
Master thesis
• #### Design of a 60 GHz Power Amplifier in a 0.13 µm SiGe BiCMOS Process ﻿

(The University of Bergen, 2016-06-01)
The wide bandwidth in the unlicensed 60 GHz band enable short range wireless data transfer in the order of tens of gigabit per second. This, combined with the relatively low-cost, very high performance SiGe fabrication ...
Master thesis