Department of Physics and Technology
Recent Submissions
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Observations of sunlit N2+ aurora at high altitudes during the RENU2 flight
(Journal article; Peer reviewed, 2021)We present measurements of sunlit aurora during the launch of the Rocket Experiment for Neutral Upwelling 2 (RENU2) on the 13 December 2015, 07:34 UTC. The in situ auroral conditions coincide with those of sunlit aurora ... -
Studies of the linear energy transfer and relative biological effectiveness in proton therapy of pediatric brain tumors
(Doctoral thesis, 2021-11-25)Proton therapy offers a reduction in dose to normal tissue compared to conventional photon-based radiotherapy. This is of particular benefit for pediatric patients as the majority are expected to become long-term survivors. ... -
Magnetospheric Multiscale Observations of an Expanding Oxygen Wave in Magnetic Reconnection
(Journal article; Peer reviewed, 2021)Heavier plasma species such as oxygen ions can have a large impact on the magnetic reconnection process. It has been hypothesized that the acceleration of demagnetized oxygen ions by the Hall electric field will lead to ... -
The Covid-19 shutdown: when studying turns digital, students want more structure
(Journal article; Peer reviewed, 2021)In March 2020, universities in Norway and many other countries shut down due to the Covid-19 pandemic. The students lost access to classrooms, libraries, study halls, and laboratories. Studying turned digital. Because it ... -
Integrating Cognitive Learning Strategies into Physics Instruction : Developing students’ approaches to physics and learning
(Doctoral thesis, 2021-03-24)Introductory physics courses are obligatory for many disciplines outside of physics. As experienced by many students, they are notoriously difficult, often with high failure rates. Many students, whether they passed or ... -
Lower-thermosphere–ionosphere (LTI) quantities: current status of measuring techniques and models
(Journal article; Peer reviewed, 2021)The lower-thermosphere–ionosphere (LTI) system consists of the upper atmosphere and the lower part of the ionosphere and as such comprises a complex system coupled to both the atmosphere below and space above. The atmospheric ... -
Helium radiography with a digital tracking calorimeter—a Monte Carlo study for secondary track rejection
(Journal article; Peer reviewed, 2021)Radiation therapy using protons and heavier ions is a fast-growing therapeutic option for cancer patients. A clinical system for particle imaging in particle therapy would enable online patient position verification, ... -
Industrial Thermal Insulation Properties above Sintering Temperatures
(Journal article; Peer reviewed, 2021)Processing highly flammable products, the oil and gas (O&G) industry can experience major explosions and fires, which may expose pressurized equipment to high thermal loads. In 2020, oil fires occurred at two Norwegian O&G ... -
Integrating effective learning strategies in basic physics lectures: A thematic analysis
(Journal article; Peer reviewed, 2021)Introductory mechanics is an obligatory course for many disciplines outside of physics and the failure rate is often high. Even the students who pass the course often fail to achieve the main learning goal: The conceptual ... -
Fibres in Heritage Objects : Identification and Characterisation by Imaging Techniques
(Doctoral thesis, 2021-08-27)The work presented in this thesis focuses on the identification and characterisation of plant fibres from cultural heritage objects. The main emphasis is on method development (Archaeometry) in the field of optical microscopy. ... -
Harvesting energy from light and water droplets by covering photovoltaic cells with transparent polymers
(Journal article; Peer reviewed, 2021)Energy harvesting of sunlight is often done using photovoltaic cells covered by a protective layer of polymer or glass. Currently, this layer does not have any other function than being transparent and protective, but its ... -
Characteristics of fragmented aurora-like emissions (FAEs) observed on Svalbard
(Journal article; Peer reviewed, 2021)This study analyses the observations of a new type of small-scale aurora-like feature, which is further referred to as fragmented aurora-like emission(s) (FAEs). An all-sky camera captured these FAEs on three separate ... -
Graphene and graphene oxide on Ir(111) are transparent to wetting but not to icing
(Journal article; Peer reviewed, 2021)Anti-icing coatings reduce the freezing onset temperature for water by changing the chemical and physical environment at the water-substrate interface to prevent ice nucleation and growth. Graphene oxide has several ... -
Use of biodegradable colloids and carbon black nanofluids for solar energy applications
(Journal article; Peer reviewed, 2021)The conversion of solar energy to heat can be performed in direct absorption solar collectors, where the radiation from the sun is absorbed by a fluid. There are various types of fluids that can be used, and recently, ... -
A numerical study of flow field and particle deposition in nasal channels with deviant geometry
(Journal article; Peer reviewed, 2021)Deviant geometry of nasal channels results in significant changes to nasal aerodynamics that alter flow resistance, sensation, and the ability to filter aerosols. The invasive, operative modification of nasal geometry might ... -
The Relationship Between Large Scale Thermospheric Density Enhancements and the Spatial Distribution of Poynting Flux
(Journal article; Peer reviewed, 2021)Large thermospheric neutral density enhancements in the cusp region have been examined for many years. The Challenging Minisatellite Payload (CHAMP) satellite for example has enabled many observations of the perturbation, ... -
Effects of motion correction, sampling rate and parametric modelling in dynamic contrast enhanced MRI of the temporomandibular joint in children affected with juvenile idiopathic arthritis
(Journal article; Peer reviewed, 2021)The temporomandibular joint (TMJ) is typically involved in 45–87% of children with Juvenile Idiopathic Arthritis (JIA). Accurate diagnosis of JIA is difficult as various clinical tests, including MRI, disagree. The purpose ... -
Dual-Lobe Reconnection and Horse-Collar Auroras
(Journal article; Peer reviewed, 2020)We propose a mechanism for the formation of the horse-collar auroral configuration during periods of strongly northward interplanetary magnetic field (IMF), invoking the action of dual-lobe reconnection (DLR). Auroral ... -
Substorm Current Wedge: Energy Conversion and Current Diversion
(Journal article; Peer reviewed, 2020)Using a magnetohydrodynamic simulation of magnetotail reconnection, flow bursts, and dipolarization, we further investigate the current diversion and energy flow and conversion associated with the substorm current wedge ... -
Coherent electron displacement for quantum information processing using attosecond single cycle pulses
(Journal article; Peer reviewed, 2020)Coherent electron displacement is a conventional strategy for processing quantum information, as it enables to interconnect distinct sites in a network of atoms. The efficiency of the processing relies on the precise control ...
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