Department of Physics and Technology
Nye registreringer
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Effect of ICME-Driven Storms on Field-Aligned and Ionospheric Currents From AMPERE and SuperMAG
(Journal article; Peer reviewed, 2022)This study investigates the field-aligned currents (FACs) and ionospheric equivalent currents for interplanetary coronal mass ejection (ICME)-driven storms by considering 45 events with a minimum Dst ≤ −50 nT. The FACs and ... -
Analysis of a Costly Fiberglass-Polyester Air Filter Fire
(Journal article; Peer reviewed, 2022)In September 2020, a fire at a liquefied natural gas (LNG) plant in the Arctic areas of Norway received national attention. In an unengaged air intake, the heat exchanger designed to prevent ice damage during production ... -
The Direct Effect of Medium Energy Electron Precipitation on Mesospheric Dynamics During a Sudden Stratospheric Warming Event in 2010
(Journal article; Peer reviewed, 2022)Medium energy electron (MEE) (30–1,000 keV) precipitation enhances the production of nitric (NOx) and hydrogen oxides (HOx) throughout the mesosphere, which can destroy ozone (O3) in catalytic reactions. The dynamical ... -
Flame heights and charring on a particle board – An experimental study
(Journal article; Peer reviewed, 2022)Vertically oriented particle-board samples were exposed to external venting flames to study the fire spread and charring behaviour along a timber façade. Variation in flame height and the height, volume, area, density, and ... -
Flow loop study of a cold and cohesive slurry. Pressure drop and formation of plugs
(Journal article; Peer reviewed, 2023)Slurries of cohesive particles constitute a significant risk during subsea petroleum production due to their potential to plug the flow. This article describes a flow loop study of a slurry consistent with 0.23-mm ice ... -
Determining Latitudinal Extent of Energetic Electron Precipitation Using MEPED On-Board NOAA/POES
(Journal article; Peer reviewed, 2022)Energetic Electron Precipitation (EEP) from the plasma sheet and the radiation belts ionizes the polar lower thermosphere and mesosphere. EEP increases the production of NOx and HOx, which will catalytically destroy ozone, ... -
Polycrystalline Diamond Coating on Orthopedic Implants: Realization and Role of Surface Topology and Chemistry in Adsorption of Proteins and Cell Proliferation
(Journal article; Peer reviewed, 2022)Polycrystalline diamond has the potential to improve the osseointegration of orthopedic implants compared to conventional materials such as titanium. However, despite the excellent biocompatibility and superior mechanical ... -
Unsteady-State CO2 Foam Generation and Propagation: Laboratory and Field Insights
(Journal article; Peer reviewed, 2022-09-07)This work presents a multiscale experimental and numerical investigation of CO2 foam generation, strength, and propagation during alternating injection of surfactant solution and CO2 at reservoir conditions. Evaluations ... -
Variation of bending rigidity with material density: bilayer silica with nanoscale holes
(Journal article; Peer reviewed, 2022)Two dimensional (2D) materials are a young class of materials that is foreseen to play an important role as building blocks in a range of applications, e.g. flexible electronics. For such applications, mechanical properties ... -
Distribution and Occurrence Frequency of dB/dt Spikes During Magnetic Storms 1980–2020
(Journal article; Peer reviewed, 2022)The physical magnetospheric cause for geomagnetically induced currents (GICs) are rapid time-varying magnetic fields (dB/dt), which occur mainly during magnetic substorms and storms. When, where and why exactly such rapid ... -
A case-control study of linear energy transfer and relative biological effectiveness related to symptomatic brainstem toxicity following pediatric proton therapy
(Journal article; Peer reviewed, 2022)Background and purpose A fixed relative biological effectiveness (RBE) of 1.1 (RBE1.1) is used clinically in proton therapy even though the RBE varies with properties such as dose level and linear energy transfer (LET). ... -
Aircraft and spacecraft observations of high-energy radiation associated with lightning leaders
(Doctoral thesis, 2022-10-03)Denne avhandlingen undersøker røntgen og gammastråling assosiert med lyn ledere, observert av instrumenter på fly og fra verdensrommet. Avhandlingen består av tre forskningsartikler, publisert i Journal of Geophysical ... -
Local Mapping of Polar Ionospheric Electrodynamics
(Journal article; Peer reviewed, 2022)An accurate description of the state of the ionosphere is crucial for understanding the physics of Earth's coupling to space, including many potentially hazardous space weather phenomena. To support this effort, ground ... -
Magnetic Reconnection and Heavy Ions
(Doctoral thesis, 2022-09-28)Majoriteten av materien i det observerbare universet eksisterer i form av en plasma. Plasmaet er karakteriseres av en samling ladede partikler som oppfyller visse elektrodynamiske egenskaper hvor den typiske potensielle ... -
Treatment planning optimization strategies for the relative biological effectiveness and oxygen enhancement ratio in proton therapy
(Doctoral thesis, 2022-09-23)Sidan kreftbehandling med proton gir ein høgare biologisk effekt enn foton, blir ein relativ biologisk effekt (RBE) brukt for å ta omsyn til forskjellen. I klinisk protonterapi i dag blir ein konstant RBE på 1.1 nytta, ... -
An Assessment of Extreme Mooring Loads for Floating Offshore Wind Structures Using Conditional Waves
(Master thesis, 2022-08-04)Wind power is one of the fastest-growing industries in the world and plays a significant role in the transition to sustainable energy systems. However, the costs of substructures and moorings limit the potential of floating ... -
The nonlinearities in the galvanostatic charging curves of supercapacitors provide insights into charging mechanisms
(Journal article; Peer reviewed, 2022)Supercapacitors are often charged using constant currents. The capacitance can be determined from the slope of the voltage-time curve if the measured voltage over the supercapacitor increases linearly with time. However, ... -
Substantial Sparing of Organs at Risk with Modern Proton Therapy in Lung Cancer, but Altered Breathing Patterns Can Jeopardize Target Coverage
(Journal article; Peer reviewed, 2022-03-08)Enhancing treatment of locally advanced non-small cell lung cancer (LA-NSCLC) by using pencil beam scanning proton therapy (PBS-PT) is attractive, but little knowledge exists on the effects of uncertainties occurring between ... -
Pore-scale bubble population dynamics of CO2-foam at reservoir pressure
(Journal article; Peer reviewed, 2022)The flow of CO2 foam for mobility control in porous media is dictated by the foam texture, or bubble density, which is commonly expressed as the number of bubbles per unit of flowing gas. In most high-pressure laboratory ... -
Interaction of three-dimensional acoustic beam with fluid-loaded solid plate: Axial near- to far-field transmission at normal beam incidence
(Journal article; Peer reviewed, 2022)Axial radiation from leaky Lamb waves propagating in a 6.05 mm water-immersed steel plate being excited by a sound beam normally incident to the plate, is investigated as a function of axial distance, z, and frequency, f, ...
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