Department of Physics and Technology: Recent submissions
Now showing items 1-20 of 2102
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Bremsstrahlung as a probe of baryon stopping in heavy-ion collisions
(Journal article; Peer reviewed, 2023)In collisions between heavy ions at ultra-relativistic energies the participating protons lose energy, which is converted into new particles. As the protons slow down, they emit bremsstrahlung radiation. The yield and ... -
CFD modelling of hydrogen and hydrogen-methane explosions – Analysis of varying concentration and reduced oxygen atmospheres
(Journal article; Peer reviewed, 2023)This paper evaluates the predictive capabilities of the advanced consequence model FLACS-CFD for deflagrations involving hydrogen. Two modelling approaches are presented: the extensively validated model system originally ... -
Inverse Compton emission from heavy WIMP annihilations in the Galactic Centre
(Journal article; Peer reviewed, 2023)A thermal relic WIMP remains a prime candidate for the nature of Dark Matter, particularly for the more poorly constrained case of a heavy ( 1 TeV) WIMP. The highest fluxes from WIMP annihilations are expected in the region ... -
Customization of the angular spectrum method for calculating the acoustic piston field transmitted through a solid plate using MATLAB
(Journal article; Peer reviewed, 2023)The angular spectrum (AS) model is customized to calculate the spatial acoustic pressure field generated by a piston source and transmitted through a steel plate immersed in water, for normal beam incidence. A MATLAB program ... -
Observation of the boson peak in a two-dimensional material
(Journal article; Peer reviewed, 2023)The boson peak is an excess in the phonon vibrational density of states relative to the Debye model. It has been observed in a wide range of amorphous materials, from inorganic glasses to polymers. Two-dimensional random ... -
Toward the end-to-end optimization of particle physics instruments with differentiable programming
(Journal article; Peer reviewed, 2023)The full optimization of the design and operation of instruments whose functioning relies on the interaction of radiation with matter is a super-human task, due to the large dimensionality of the space of possible choices ... -
Interhemispheric asymmetries of neutral upwelling and ion upflow
(Journal article; Peer reviewed, 2023)This work addresses interhemispheric differences in cusp-related neutral density enhancements. The focus is on enhancements that are driven by Poleward Moving Auroral Forms (PMAF), which provide a repetitive sequence of ... -
Global ULF Waves Excited by Solar Wind Dynamic Pressure Impulses: 1. Timescales and Geomagnetic Activity Dependence
(Journal article; Peer reviewed, 2023)Solar wind dynamic pressure pulse is one of the sources of ultra-low frequency (ULF) waves. Based on 1-second resolution magnetic field observations from SuperMAG from 2012 to 2019, we conducted a statistical study on ... -
3He spin-echo scattering indicates hindered diffusion of isolated water molecules on graphene-covered Ir(111)
(Journal article; Peer reviewed, 2023)The dynamics of water diffusion on carbon surfaces are of interest in fields as diverse as furthering the use of graphene as an industrial-coating technology and understanding the catalytic role of carbon-based dust grains ... -
Effect of relative permeability hysteresis on reservoir simulation of underground hydrogen storage in an offshore aquifer
(Journal article; Peer reviewed, 2023)Underground hydrogen storage (UHS) in porous media is proposed to balance seasonal fluctuations between demand and supply in an emerging hydrogen economy. Despite increasing focus on the topic worldwide, the understanding ... -
Library of Simulated Gamma-Ray Glows and Application to Previous Airborne Observations
(Journal article; Peer reviewed, 2023)Gamma-Ray Glows (GRGs) are high energy radiation originating from thunderclouds, in the MeV energy regime, with typical duration of seconds to minutes, and sources extended over several to tens of square kilometers. GRGs ... -
A unified picture of medium-induced radiation
(Journal article; Peer reviewed, 2023)We revisit the picture of jets propagating in the quark-gluon plasma. In addition to vacuum radiation, partons scatter on the medium constituents resulting in induced emissions. Analytical approaches to including these ... -
Prompt gamma-ray spectroscopy in conjunction with the Monte Carlo Library Least Squares approach: applications to range verification in proton therapy
(Journal article; Peer reviewed, 2023)Prompt Gamma-ray Spectroscopy (PGS) in conjunction with the Monte Carlo Library Least Squares (MCLLS) approach was investigated for the purposes of range monitoring in proton therapy through Monte Carlo simulations. Prompt ... -
Probing the Atomic Arrangement of Subsurface Dopants in a Silicon Quantum Device Platform
(Journal article; Peer reviewed, 2023)High-density structures of subsurface phosphorus dopants in silicon continue to garner interest as a silicon-based quantum computer platform; however, a much-needed confirmation of their dopant arrangement has been lacking. ... -
Do the Throat Auroras Create Polar Cap Patches?
(Journal article; Peer reviewed, 2023)Throat auroras and polar cap patches are common phenomena in the polar ionosphere resulting from magnetosphere-ionosphere coupling. A campaign was organized, with all-sky imagers at Yellow River Station, the European ... -
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 ... -
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 ... -
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 ...