Blar i Department of Physics and Technology på tittel
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How Often Do Thermally Excited 630.0 nm Emissions Occur in the Polar Ionosphere?
(Peer reviewed; Journal article, 2018-01)This paper studies thermally excited emissions in the polar ionosphere derived from European Incoherent Scatter Svalbard radar measurements from the years 2000–2015. The peak occurrence is found around magnetic noon, where ... -
How the IMF By induces a By component in the closed magnetosphere and how it leads to asymmetric currents and convection patterns in the two hemispheres
(Peer reviewed; Journal article, 2015-11-12)We used the Lyon-Fedder-Mobarry global magnetohydrodynamics model to study the effects of the interplanetary magnetic field (IMF) By component on the coupling between the solar wind and magnetosphere-ionosphere system. ... -
How to Improve Visibility in Turbid Water
(Master thesis, 2021-06-01) -
A hybrid multi-particle approach to range assessment-based treatment verification in particle therapy
(Journal article; Peer reviewed, 2023)Particle therapy (PT) used for cancer treatment can spare healthy tissue and reduce treatment toxicity. However, full exploitation of the dosimetric advantages of PT is not yet possible due to range uncertainties, warranting ... -
A Hybrid Numerical Method for 3D Multiphysics Modeling of Ultrasonic Transit-Time Flowmeters : Including Sound Propagation in Real Pipe Flows
(Doctoral thesis, 2023-10-20)Ultralyd mengdemålere av typen Ultrasonic Transit-Time Flowmeters (UTTF) og deres modellering er hovedfokus i denne avhandlingen. UTTF kan kategoriseres i clamp-on og inline-målere avhengig av behovene til applikasjoner ... -
Hydratdannelse og metanproduksjon fra gasshydrat - produksjonsmetoder og resistivitetsutvikling
(Master thesis, 2009-11-20)Ved høye trykk og lave temperaturer kan vannmolekyler danne strukturelle bur rundt et gjestemolekyl. Denne substansen er da i fast form og kalles hydrat. I naturlig forekomst av gasshydrat er metan det vanligste gjestemolekylet. ... -
Hydrate Formation and CH4 Production from Natural Gas Hydrates - Emphasis on Boundary Conditions and Production Methods
(Master thesis, 2009-05-13)Natural gas hydrate is a solid state of gas and water at low temperature and high pressure. Gas hydrates are known to form hydrate plugs in production line, and has thus generally been considered a problem to the oil ... -
Hydrate formation and CO2 - CH4 exchange in sandstone - An experimental study with emphasis on the role of initial brine saturation and salinity
(Master thesis, 2013-06-01)Recent research activity has demonstrated the viability of producing methane from gas hydrate bearing sediments by injecting and sequestering CO2 in a process where CO2 replace methane in gas hydrate by a process called ... -
Hydrate Monitoring using Capacitive Sensors
(Master thesis, 2013-06-02)Gas hydrates are of particular interest in petroleum industry since their formation during oil-production can be a major risk factor. Gas hydrates can block pipelines, interrupt production, and in worst case even cause ... -
Hydrate Nucleation, Growth, and Induction
(Journal article; Peer reviewed, 2020)The first stage of any phase transition is a dynamic coupling of transport processes and thermodynamic changes. The free energy change of the phase transition must be negative and large enough to also overcome the penalty ... -
Hydrate Phase Transition-Risk, Energy Potential and CO2 Storage Possibilities
(Doctoral thesis, 2022-02-11)Natural gas hydrate (NGH) can cause crucial flow assurance problems to the oil and gas industry. It is being considered as a potential vast energy resource for the world in the future. It could also potentially provide a ... -
Hydrate Plugging and Flow Remediation during CO2 Injection in Sediments
(Journal article; Peer reviewed, 2020)Successful geological sequestration of carbon depends strongly on reservoir seal integrity and storage capacity, including CO2 injection efficiency. Formation of solid hydrates in the near-wellbore area during CO2 injection ... -
Hydrate Production Philosophy and Thermodynamic Calculations
(Journal article; Peer reviewed, 2020)The amount of energy in the form of natural gas hydrates is huge and likely substantially more than twice the amount of worldwide conventional fossil fuel. Various ways to produce these hydrates have been proposed over the ... -
Hydrodynamical studies of Quark Gluon Plasma: Collective behaviour, initial fluctuations and theoretical fundaments
(Master thesis, 2012-05-30)This master thesis focuses on collective behaviour of the Quark Gluon Plasma, created at the Large Hadron Collider at CERN. We calculate analytically and semi-analytically the transverse momentum and rapidity dependence ... -
Hydroelectric Power in Present and Future Energy Systems
(Master thesis, 2013-06-03)To be able to understand the dynamics of energy systems, the interplay between a variety of factors affecting them has to be addressed. In this thesis, we look at issues like climate change, energy policy, power transmission, ... -
Hydrogen Relative Permeability Hysteresis in Underground Storage
(Journal article; Peer reviewed, 2022)Implementation of the hydrogen economy for emission reduction will require storage facilities, and underground hydrogen storage (UHS) in porous media offers a readily available large-scale option. Lack of studies on ... -
Hypoxia adapted relative biological effectiveness models for proton therapy: a simulation study
(Journal article; Peer reviewed, 2022)In proton therapy, a constant relative biological effectiveness (RBE) factor of 1.1 is applied although the RBE has been shown to depend on factors including the Linear Energy Transfer (LET). The biological effectiveness ... -
Identification of boosted Higgs bosons decaying into b-quark pairs with the ATLAS detector at 13 TeV
(Peer reviewed; Journal article, 2019)This paper describes a study of techniques for identifying Higgs bosons at high transverse momenta decaying into bottom-quark pairs, H→bb¯, for proton–proton collision data collected by the ATLAS detector at the Large ... -
Identifikasjon av undervannsobjekter ved bruk av ultralyd
(Master thesis, 2018-09-04)Hensikten med dette prosjektet er å undersøke om ultralyd kan benyttes som et detekteringssystem under vann. Det er blitt designet tre ulike reflektorer for å se på refleksjonsegenskapene til disse. Fjernstyrte undervannsfarkoster ... -
Identifying the nature of the QCD transition in heavy-ion collisions with deep learning
(Journal article; Peer reviewed, 2021)In this proceeding, we review our recent work using deep convolutional neural network (CNN) to identify the nature of the QCD transition in a hybrid modeling of heavy-ion collisions. Within this hybrid model, a viscous ...