Department of Physics and Technology
Nye registreringer
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Deciphering Spatio-Temporal Variations in the Auroral Ionosphere using Magnetometer Data
(Doctoral thesis, 2024-03-22)Den polare ionosfæren er et dynamisk plasma-miljø dominert av koblingen mellom solvinden og jordens magnetosfære. Nordlyset, plasma-bevegelsen og elektriske strømmer i ionosfæren er skalert og drevet av dagsidekoblingen ... -
Statistical Temporal Variations in the Auroral Electrojet Estimated With Ground Magnetometers in Fennoscandia
(Journal article; Peer reviewed, 2023)We present the implementation of an improved technique to coherently model the high-latitude ionospheric equivalent current. Using a fixed selection of 20 ground magnetometers in Fennoscandia, we present a method based on ... -
An organ deformation model using Bayesian inference to combine population and patient-specific data
(Journal article; Peer reviewed, 2023)Objective. Organ deformation models have the potential to improve delivery and reduce toxicity of radiotherapy, but existing data-driven motion models are based on either patient-specific or population data. We propose to ... -
Minimal sterile neutrino dark matter
(Journal article; Peer reviewed, 2023)We propose a novel mechanism to generate sterile neutrinos νs in the early Universe, by converting ordinary neutrinos να in scattering processes νsνα→νsνs. After initial production by oscillations, this leads to an exponential ... -
Fluorescence intensity and fluorescence lifetime measurements of various carbon dots as a function of pH
(Journal article; Peer reviewed, 2023)Measurement and monitoring of pH are essential in both the industry and academia. It is therefore important to continue developing novel, low-cost pH sensors that provide increased accuracy over long periods of time. ... -
Pore-scale spatiotemporal dynamics of microbial-induced calcium carbonate growth and distribution in porous media
(Journal article; Peer reviewed, 2023)The naturally occurring bio-geochemical microbial-induced calcium carbonate precipitation (MICP) process is an eco-friendly technology for rehabilitating construction materials, reinforcement of soils and sand, heavy metals ... -
Efficacy and User Experience of a Novel X-Ray Shield on Operator Radiation Exposure during Cardiac Catheterization: A Randomized Controlled Trial
(Journal article; Peer reviewed, 2023)BACKGROUND: Radiation shielding is mandatory during cardiac catheterization, but there is a need to improve efficacy and ease of use. METHODS: The aim of the study was to assess the shielding effect and user feedback ... -
Kinetic model of resonant nanoantennas in polymer for laser induced fusion
(Journal article; Peer reviewed, 2023)Studies of resilience of light-resonant nanoantennas in vacuum are extended to consider the case of polymer embedding. This modifies the nanoantenna’s lifetime and resonant laser pulse energy absorption. The effective ... -
Improving photon and proton radiotherapy of locally advanced non-small cell lung cancer
(Doctoral thesis, 2024-03-19)Pasienter med lokalavansert ikke-småcellet lungekreft (LA-NSCLC) har svulster som er store, vokser inn i andre strukturer i brystkassen, og/eller har spredt seg til regionale lymfeknuter. Disse pasientene er som oftest ... -
Seasonality and drivers of water column optical properties on the northwestern Barents Sea shelf
(Journal article; Peer reviewed, 2023)Hydrographic and bio-optical measurements were conducted along a south–north transect on the northwestern Barents Sea shelf from early spring to late summer in 2021. Strong climate change manifestations observed in this ... -
Background removal from global auroral images: Data driven dayglow modelling
(Journal article; Peer reviewed, 2023)Global images of auroras obtained by cameras on spacecraft are a key tool for studying the near-Earth environment. However, the cameras are sensitive not only to auroral emissions produced by precipitating particles, but ... -
Pore-scale study of microbial hydrogen consumption and wettability alteration during underground hydrogen storage
(Journal article; Peer reviewed, 2023)Hydrogen can be a renewable energy carrier and is suggested to store renewable energy and mitigate carbon dioxide emissions. Subsurface storage of hydrogen in salt caverns, deep saline formations, and depleted oil/gas ... -
Performance of the electromagnetic pixel calorimeter prototype Epical-2
(Journal article; Peer reviewed, 2023)The first evaluation of an ultra-high granularity digital electromagnetic calorimeter prototype using 1.0–5.8 GeV/c electrons is presented. The 25 × 106 pixel detector consists of 24 layers of ALPIDE CMOS MAPS sensors, ... -
Unusual shrinkage and reshaping of Earth’s magnetosphere under a strong northward interplanetary magnetic field
(Journal article; Peer reviewed, 2023)The Earth’s magnetosphere is the region of space where plasma behavior is dominated by the geomagnetic field. It has a long tail typically extending hundreds of Earth radii (RE) with plentiful open magnetic fluxes threading ... -
Towards Neural Charged Particle Tracking in Digital Tracking Calorimeters With Reinforcement Learning
(Journal article; Peer reviewed, 2023)We propose a novel technique for reconstructing charged particles in digital tracking calorimeters using reinforcement learning aiming to benefit from the rapid progress and success of neural network architectures without ... -
Visualization of Unsteady Flow in a Multistage Helico-Axial Pump
(Journal article, 2023)Helico-axial pumps are designed to pump mixtures of gas and liquid. Secondary flows and rotor-stator interactions are known to add complexity to the flow field in unshrouded axial-flow turbomachinery. Here we use a high-speed ... -
Neural network approach for correction of multiple scattering errors in the LISST-VSF instrument
(Journal article; Peer reviewed, 2023)The LISST-VSF is a commercially developed instrument used to measure the volume scattering function (VSF) and attenuation coefficient in natural waters, which are important for remote sensing, environmental monitoring and ... -
Sub-resolution contrast in neutral helium microscopy through facet scattering for quantitative imaging of nanoscale topographies on macroscopic surfaces
(Journal article; Peer reviewed, 2023)Nanoscale thin film coatings and surface treatments are ubiquitous across industry, science, and engineering; imbuing specific functional or mechanical properties (such as corrosion resistance, lubricity, catalytic activity ... -
Exploring the use of nanofluids in pump-free systems for solar thermal applications
(Journal article; Peer reviewed, 2023)By using nanofluids as a working fluid in pump-free designs, thermal energy systems can become more efficient and have reduced maintenance costs, ultimately extending the system’s lifespan. In this paper, our goal is to ... -
Low Power Giga Bit Transceiver (lpGBT) Test-Suite
(Master thesis, 2023-12-20)The ALICE detector, one of the key instruments at CERN's LHC, is dedicated to capturing and measuring the properties of particles generated in high-energy particle collisions. To enhance its capabilities for studying these ...