Browsing Department of Physics and Technology by Title
Now showing items 1920-1939 of 2153
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Space and Energy Distribution of Dark Matter
(Master thesis, 2011-11-17)I start by an introduction to the notion of, and motivation for, Dark Matter, as well as a short motivation for supersymmetry, the theoretical framework usually examined when looking for places that dark matter may hide. ... -
A space hurricane over the Earth’s polar ionosphere
(Journal article; Peer reviewed, 2021)In Earth’s low atmosphere, hurricanes are destructive due to their great size, strong spiral winds with shears, and intense rain/precipitation. However, disturbances resembling hurricanes have not been detected in Earth’s ... -
Space weather challenges of the polar cap ionosphere
(Peer reviewed; Journal article, 2013)This paper presents research on polar cap ionosphere space weather phenomena conducted during the European Cooperation in Science and Technology (COST) action ES0803 from 2008 to 2012. The main part of the work has been ... -
Space Weather impact on the degradation of NOAA POES MEPED proton detectors
(Peer reviewed; Journal article, 2016-06-07)The Medium Energy Proton and Electron Detector (MEPED) on board the National Oceanic and Atmospheric Administration Polar Orbiting Environmental Satellites (NOAA POES) is known to degrade with time. In recent years a lot ... -
Spatial Agreement of Brainstem Dose Distributions Depending on Biological Model in Proton Therapy for Pediatric Brain Tumors
(Journal article; Peer reviewed, 2021)Purpose During radiation therapy for pediatric brain tumors, the brainstem is a critical organ at risk, possibly with different radio-sensitivity across its substructures. In proton therapy, treatment planning is currently ... -
Spatial evolution of magnetic reconnection diffusion region structures with distance from the X-line
(Journal article; Peer reviewed, 2021)We report Magnetospheric Multiscale four-spacecraft observations of a thin reconnecting current sheet with weakly asymmetric inflow conditions and a guide field of approximately twice the reconnecting magnetic field. The ... -
Spatial Resolution in Inverse Problems: The EZIE Satellite Mission
(Journal article; Peer reviewed, 2023)Inverse modeling has become one of the primary methods for studying ionospheric electrodynamics, especially when using magnetic field measurements from below the ionosphere. We present a method for quantifying the spatial ... -
Spatial Variation in the Responses of the Surface External and Induced Magnetic Field to the Solar Wind
(Peer reviewed; Journal article, 2019-07-05)We analyze the spatial variation in the response of the surface geomagnetic field (or the equivalent ionospheric current) to variations in the solar wind. Specifically, we regress a reanalysis of surface external and induced ... -
Special Core Analysis of Low Reservoir Quality Chalk
(Master thesis, 2016-11-19)This experimental work investigates Low Reservoir Quality Chalk (LRQC) reservoir properties using outcrop samples from six zones. The thesis is part of Joint Chalk Research Programme, Phase 7 (JCR 7), a large interdisciplinary ... -
Spectra and mean multiplicities of π− in central 40Ar+45Sc collisions at 13A, 19A, 30A, 40A, 75A and 150A GeV/c beam momenta measured by the NA61/SHINE spectrometer at the CERN SPS
(Journal article; Peer reviewed, 2021)The physics goal of the strong interaction program of the NA61/SHINE experiment at the CERN Super Proton Synchrotron (SPS) is to study the phase diagram of hadronic matter by a scan of particle production in collisions of ... -
Spectral albedo and transmittance of thin young Arctic sea ice
(Peer reviewed; Journal article, 2016-01)Spectral albedo and transmittance in the range 400–900nm were measured on three separate dates on less than 15 cm thick new Arctic sea ice growing on Kongsfjorden, Svalbard at 78:9°N, 11:9°E. Inherent optical properties, ... -
Spectral Analysis of Individual Terrestrial Gamma-ray Flashes Detected by ASIM
(Journal article; Peer reviewed, 2021)The Atmosphere-Space Interactions Monitor (ASIM) is the first instrument in space specifically designed to observe terrestrial gamma-ray flashes (TGFs). TGFs are high energy photons associated with lightning flashes and ... -
Spectral Analysis of Terrestrial Gamma-ray Flashes and Their Connection to Lightning Discharges
(Doctoral thesis, 2022-04-01)This PhD thesis consists of three papers published in the Journal of Geophysical Research: Atmospheres. The thesis provides a new method to identify TGFs, detected from space, that are associated with radio-sferics. The ... -
Spectral Observations of Optical Emissions Associated With Terrestrial Gamma-Ray Flashes
(Journal article; Peer reviewed, 2021)The Atmosphere-Space Interactions Monitor measures Terrestrial Gamma-Ray Flashes (TGFs) simultaneously with optical emissions from associated lightning activity. We analyzed optical measurements at 180–230, 337, and 777.4 ... -
A spectrum-of-spectrum filtering method to extract direct and multipath arrivals from simulations and measurements
(Journal article; Peer reviewed, 2023)In measurements and numerical modelling of wave propagation, undesired interference between direct and multipath arrivals can be reduced using Fourier-based signal processing methods. Existing methods, such as cepstral ... -
Spin alignment measurements using vector mesons with ALICE detector at the LHC
(Peer reviewed; Journal article, 2019-01-22)We present new measurements related to spin alignment of K*0 vector mesons at mid-rapidity for Pb–Pb collisions at √sNN = 2.76 and 5.02 TeV. The spin alignment measurements are carried out with respect to production plane ... -
Spontaneous Imbibition in Sand - Viscosity Effects on Oil Recovery and Flow Using Polymer and Glycerol
(Master thesis, 2016-06-01)Spontaneous imbibition experiments have historically been performed using all faces open (AFO) boundary condition. Due to complex flow patterns consisting of both counter- and co-current flow, modelling flow using established ... -
Spontaneous symmetry breaking in the S3-symmetric scalar sector
(Peer reviewed; Journal article, 2016-02)We present a detailed study of the vacua of the S3-symmetric three-Higgs-doublet potential, specifying the region of parameters where these minimisation solutions occur. We work with a CP conserving scalar potential and ... -
Spontaneous symmetry breaking in three-Higgs-doublet \(S_3\)-symmetric models
(Peer reviewed; Journal article, 2017)The talk summarises work done by the authors consisting of a detailed study of the possible vacua in models with three Higgs doublets with \(S_3\) symmetry and without explicit CP violation. Different vacua require special ... -
Stabilization of circular Rydberg atoms by circularly polarized infrared laser fields
(Peer reviewed; Journal article, 2011-09-29)The ionization dynamics of circular Rydberg states in strong circularly polarized infrared (800 nm) laser fields is studied by means of numerical simulations with the time-dependent Schr¨odinger equation. We find that at ...