Department of Physics and Technology
Recent Submissions
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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). ... -
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 ... -
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, ... -
Dynamic Susceptibility Contrast MRI May Contribute in Prediction of Stereotactic Radiosurgery Outcome in Brain Metastases
(Journal article; Peer reviewed, 2022)Background Following stereotactic radiosurgery (SRS), predicting treatment response is not possible at an early stage using structural imaging alone. Hence, the current study aims at investigating whether dynamic ... -
On the design of Neutral Scanning Helium Atom Microscopes (SHeM) : Optimal configurations and evaluation of experimental findings
(Doctoral thesis, 2021-11-09)Scanning Helium Microscopes (SHeMs) are novel microscopy tools using neutral helium atoms as the imaging probe. Helium atoms have several advantages compared to other probes such as electrons or helium ions. Helium atoms ... -
Finite-amplitude sound propagation effects in volume backscattering measurements for fish abundance estimation
(Journal article; Peer reviewed, 2022)Scientific advice for governmental management of marine resources relies on acoustical observation methods. Quantification and identification of fish and plankton species are often achieved using multi-frequency acoustic ... -
Photothermal conversion of biodegradable fluids and carbon black nanofluids
(Journal article; Peer reviewed, 2022)The paper is devoted to the topic of direct absorption solar collectors (DASCs). Various kinds of fluids can be used as heat transfer fluid in DASCs, and the main focus of our paper is on comparing nanofluids (water with ... -
Photothermal convection of a magnetic nanofluid in a direct absorption solar collector
(Journal article; Peer reviewed, 2022)Nanofluid-based direct absorption of solar heat results in thermal efficiencies superior to conventional solar thermal technology. In addition, convection of nanofluid can be sustained pump-free in the collector. In this ... -
Experimental investigation of erosion due to nanofluids
(Journal article; Peer reviewed, 2022)The demand for efficient and sustainable energy is continuously increasing. Among the many technologies with great potential within this field are nanofluids. Nevertheless, there is still a considerable lack of information ... -
Comparative study on the uniform energy deposition achievable via optimized plasmonic nanoresonator distributions
(Journal article; Peer reviewed, 2022)Plasmonic nanoresonators of core–shell composition and nanorod shape were optimized to tune their absorption cross-section maximum to the central wavelength of a short laser pulse. The number density distribution of randomly ... -
New, spherical solutions of non-relativistic, dissipative hydrodynamics
(Journal article; Peer reviewed, 2022)We present a new family of exact solutions of dissipative fireball hydrodynamics for arbitrary bulk and shear viscosities. The main property of these solutions is a spherically symmetric, Hubble flow field. The motivation ... -
Experimental study of hydrogen production using electrolyte nanofluids with a simulated light source
(Journal article; Peer reviewed, 2022)In this research, we conducted water electrolysis experiments of a carbon black (CB) based sodium sulfate electrolyte using a Hoffman voltameter. The main objective was to investigate hydrogen production in such systems, ...
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