Browsing Department of Physics and Technology by Title
Now showing items 302-321 of 2276
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Dawn-dusk asymmetries in the coupled solar wind-magnetosphere-ionosphere system: a review
(Peer reviewed; Journal article, 2014-07-01)Dawn–dusk asymmetries are ubiquitous features of the coupled solar-wind–magnetosphere–ionosphere system. During the last decades, increasing availability of satellite and ground-based measurements has made it possible to ... -
Dayside and nightside magnetic field responses at 780 km altitude to dayside reconnection
(Peer reviewed; Journal article, 2017-02)During southward interplanetary magnetic field, dayside reconnection will drive the Dungey cycle in the magnetosphere, which is manifested as a two‐cell convection pattern in the ionosphere. We address the response of the ... -
Dayside Field-Aligned Current Impacts on Ionospheric Irregularities
(Journal article; Peer reviewed, 2020)Global Navigation Satellite Systems (GNSS) are subject to disturbances caused by plasma irregularities in the ionosphere. Studies have suggested that in addition to the gradient drift and Kelvin‐Helmholtz instabilities, ... -
Dayside Transient Phenomena and Their Impact on the Magnetosphere and Ionosphere
(Journal article; Peer reviewed, 2022)Dayside transients, such as hot flow anomalies, foreshock bubbles, magnetosheath jets, flux transfer events, and surface waves, are frequently observed upstream from the bow shock, in the magnetosheath, and at the magnetopause. ... -
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 ... -
Decontamination of persistent organic pollutants in fishmeal and fish oil. Process optimization and modeling
(Doctoral thesis, 2011-10-07)Persistent organic pollutants (POPs) are fat soluble chemical substances that persist in the environment and bioaccumulate in the food chain. Through long-range environmental transportation by air, water and migratory ... -
Deep learning jet modifications in heavy-ion collisions
(Journal article; Peer reviewed, 2021)Jet interactions in a hot QCD medium created in heavy-ion collisions are conventionally assessed by measuring the modification of the distributions of jet observables with respect to the proton-proton baseline. However, ... -
Defect detection and acoustic penetration of grout in offshore structures
(Master thesis, 2023-08-31) -
Demonstrating the potential of CO2 hydrate self-sealing in Svalbard, Arctic Norway
(Peer reviewed; Journal article, 2019-10)Here we report the potential self-sealing properties of CO2 hydrate for the Longyearbyen CO2 Lab’s shallow aquifer in Svalbard, Arctic Norway, through hydrate formation experiments. The experiments were conducted on a 9 cm ... -
The Dependence of Cold and Hot Patches on Local Plasma Transport and Particle Precipitation in Northern Hemisphere Winter
(Journal article; Peer reviewed, 2022)By using a database of 4,634 cold patches (high density and low electron temperature) and 4,700 hot patches (high density and high electron temperature) from Defense Meteorological Satellite Program F16 in 2005–2018 winter ... -
Dependence of Sudden Stratospheric Warmings on Internal and External Drivers
(Journal article; Peer reviewed, 2020)A sudden stratospheric warming (SSW) is a large-scale disturbance of the wintertime stratosphere, which occurs especially in the Northern Hemisphere. Earlier studies have shown that SSW occurrence depends on atmospheric ... -
Dependence of the global dayside reconnection rate on interplanetary magnetic field By and the earth’s dipole tilt
(Journal article; Peer reviewed, 2022)In the recent years, significant attention has been given to the combined effect of Interplanetary Magnetic Field (IMF) duskward component (By) and dipole tilt on the global magnetosphere-ionosphere system response. Numerous ... -
Design and Development of the SMILE SXI Radiation Shutter Control System
(Master thesis, 2018-06-19)This thesis concerns the design, implementation, testing and verification of the radiation shutter control system, an embedded, microcontroller-based system, to be used in the Solar Wind Magnetosphere Ionosphere Link ... -
Design and Experimental Studies of a Nanofluid Direct Absorption Solar Collector
(Master thesis, 2020-09-08) -
Design and Implementation of a High-Speed Readout and Control System for a Digital Tracking Calorimeter for proton CT
(Doctoral thesis, 2021-02-18)Particle therapy, a non-invasive technique for treating cancer using protons and light ions, has become more and more common. For example, a particle treatment facility is currently being built, in Bergen, Norway. Proton ... -
Design and implementation of fast and sparsified readout for Monolithic Active Pixel Sensors
(Doctoral thesis, 2010-11-26)This thesis focuses on the development of smart pixel readout architectures that should ultimately be targeted for the Micro-Vertex Detector (MVD) of the CBM (Compressed Baryonic Matter) experiment. The technical challenge ... -
Design and Simulation of Pixel Layout and Data Processing Algorithms for the DEEP Instrument
(Master thesis, 2018-10-17)A team of researchers at Birkeland Centre for Space Science is developing an instrument that is able to measure particle precipitation into the atmosphere. The instrument consist of both electron and proton detectors, hence ... -
Design of a 60 GHz Low Noise Amplifier in a 0.13 µm SiGe BiCMOS Process
(Master thesis, 2016-06-01)The Large Hadron Collider (LHC) in CERN outside Geneva in Switzerland is scheduled for an upgrade to improve the luminosity. This upgrade will require higher granularity for the triggering system, increasing the need for ... -
Design of a 60 GHz Power Amplifier in a 0.13 µm SiGe BiCMOS Process
(Master thesis, 2016-06-01)The wide bandwidth in the unlicensed 60 GHz band enable short range wireless data transfer in the order of tens of gigabit per second. This, combined with the relatively low-cost, very high performance SiGe fabrication ... -
Design of a 60 GHz VCO Hybrid Microstrip Resonator in a 0.13-µm Sige process
(Master thesis, 2017-06-29)Augmented reality, 4K television and video gaming. These are just some examples were the wireless products lacks performance in terms of multi-gigabit data transfers. A solution to this challenge is the 60 GHz band. The ...