### Nye registreringer

• #### Quantitative Magnetic Resonance Imaging of Tissue Microvasculature and Microstructure in Selected Clinical Applications ﻿

(Doctoral thesis, 2022-06-03)
This thesis is based on four papers and aims to establish perfusion and diffusion measurements with magnetic resonance imaging (MRI) in selected clinical applications. While structural imaging provides invaluable geometric ...
• #### Problem solving in basic physics: Effective self-explanations based on four elements with support from retrieval practice ﻿

(Journal article; Peer reviewed, 2022)
Self-explanation, a learning strategy where students explain to themselves the steps taken in a worked example, is an effective learning strategy in early cognitive skill acquisition. However, many physics students produce ...
• #### Modelling of gas hydrates in sedimentary systems : Methane hydrates impact on flow through porous media ﻿

(Doctoral thesis, 2022-04-06)
In nature, gas hydrates exist in areas of permafrost and in shallow subsurface sediments at ocean depths of more than 300-500 metres. In terms of the Sustainable Development Goals (SDG) of the United Nations, better ...
• #### Efficient Monte Carlo simulation reveals significant multiple scattering errors in underwater angular scattering measurements ﻿

(Journal article; Peer reviewed, 2022)
Multiple scattering can severely affect the accuracy of optical instrumentation. Variance reduction methods have been implemented to improve a Monte Carlo model developed to simulate volume scattering functions measured ...
• #### Updated constraints on Z′ and W′ bosons decaying into bosonic and leptonic final states using the run 2 ATLAS data ﻿

(Journal article; Peer reviewed, 2021)
The full ATLAS run 2 dataset with a time-integrated luminosity of 139  fb−1 in the diboson and dilepton channels is used to probe benchmark models with extended gauge sectors: the E6-motivated grand unification models, the ...
• #### GPS Scintillations and TEC Variations in Association With a Polar Cap Arc ﻿

(Journal article; Peer reviewed, 2021)
A unique example of a polar cap arc producing clear amplitude and phase scintillations in GPS L-band signals is presented using observations from an all-sky imager and a GPS receiver and a digital ionosonde at Resolute Bay ...
• #### Energy dependence of ϕ meson production at forward rapidity in pp collisions at the LHC ﻿

(Journal article; Peer reviewed, 2021)
The production of $\phi$ mesons has been studied in pp collisions at LHC energies with the ALICE detector via the dimuon decay channel in the rapidity region $2.5< y < 4$. Measurements of the differential cross section ...
• #### Et kritisk og konstruktivt blikk på naturfaget i norsk skole ﻿

(Chapter, 2021)
Dette kapitlet retter et kritisk, men konstruktivt blikk på naturfag, og foretar en gjennomgang av naturfag og naturfagdidaktikk innen forskning og i praksis. Kapitlet starter med å beskrive og diskutere naturfagets ...
• #### High-latitude cold ion outflow inferred from the Cluster wake observations in the magnetotail lobes and the polar cap region ﻿

(Journal article; Peer reviewed, 2021)
Cold ions with low (a few eV) thermal energies and also often low bulk drift energies, dominate the ion population in the Earth’s magnetosphere. These ions mainly originate from the ionosphere. Here we concentrate on cold ...
• #### Search for resonances decaying into photon pairs in 139 fb−1 of pp collisions at √s = 13 TeV with the ATLAS detector ﻿

(Journal article, 2021)
Searches for new resonances in the diphoton final state, with spin 0 as predicted by theories with an extended Higgs sector and with spin 2 using a warped extra-dimension benchmark model, are presented using 139 fb−1 of √ ...
• #### Production of Terrestrial Gamma-Ray Flashes During the Early Stages of Lightning Flashes ﻿

(Journal article, 2022)
Terrestrial Gamma-ray Flashes (TGFs) are short emissions of high energy photons associated with thunderstorms. It has been known since the discovery of TGFs that they are associated with lightning, and several case studies ...
• #### Anisotropic flow of identified hadrons in Xe-Xe collisions at √sNN = 5.44 TeV ﻿

(Journal article; Peer reviewed, 2021)
Measurements of elliptic (v2) and triangular (v3) flow coefficients of π±, K±, p+$\overline{\mathrm{p}}$, ${\mathrm{K}}_{\mathrm{S}}^0$, and Λ+$\overline{\Lambda}$ obtained with the scalar product method in ...
• #### Exploring solar-terrestrial interactions via multiple imaging observers ﻿

(Journal article; Peer reviewed, 2021)
How does solar wind energy flow through the Earth’s magnetosphere, how is it converted and distributed? is the question we want to address. We need to understand how geomagnetic storms and substorms start and grow, not ...
• #### A Simultaneous Observation of Lightning by ASIM, Colombia-Lightning Mapping Array, GLM, and ISS-LIS ﻿

(Journal article; Peer reviewed, 2021)
The Atmosphere-Space Interactions Monitor (ASIM) on the International Space Station (ISS) provides optical radiances and images of lightning flashes in several spectral bands. This work presents a lightning flash simultaneously ...
• #### Network community structure of substorms using SuperMAG magnetometers ﻿

(Journal article; Peer reviewed, 2021)
Geomagnetic substorms are a global magnetospheric reconfiguration, during which energy is abruptly transported to the ionosphere. Central to this are the auroral electrojets, large-scale ionospheric currents that are part ...
• #### Effective screening of medium-assisted van der Waals interactions between embedded particles ﻿

(Journal article; Peer reviewed, 2021)
The effect of an implicit medium on dispersive interactions of particle pairs is discussed, and simple expressions for the correction relative to vacuum are derived. We show that a single point Gauss quadrature leads to ...
• #### 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 ...
• #### Time evolution of storms producing terrestrial gamma-ray flashes using era5 reanalysis data, gps, lightning and geo-stationary satellite observations ﻿

(Journal article; Peer reviewed, 2021)
In this article, we report the first investigation over time of the atmospheric conditions around terrestrial gamma-ray flash (TGF) occurrences, using GPS sensors in combination with geostationary satellite observations ...
• #### Magnetospheric Flux Throughput in the Dungey Cycle: Identification of Convection State During 2010 ﻿

(Journal article; Peer reviewed, 2021)
We quantify the contributions of different convection states to the magnetic flux throughput of the magnetosphere during 2010. To do this we provide a continuous classification of convection state for the duration of 2010 ...
• #### Low-energy probes of no-scale SU(5) super-GUTs ﻿

(Journal article; Peer reviewed, 2021)
We explore the possible values of the $\mu \rightarrow e \gamma$ branching ratio, $\text {BR}(\mu \rightarrow e\gamma )$, and the electron dipole moment (eEDM), $d_e$, in no-scale SU(5) super-GUT models with the ...