Browsing Department of Physics and Technology by Title
Now showing items 1797-1816 of 1839
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Validating the Space Weather Modeling Framework (SWMF) for applications in northern Europe: Ground magnetic perturbation validation
(Journal article; Peer reviewed, 2020)In this study we investigate the performance of the University of Michigan’s Space Weather Modeling Framework (SWMF) in prediction of ground magnetic perturbations (ΔB) and their rate of change with time (dB/dt), which is ... -
Vannbasert eor i oppsprukne bergarter - økt oljeutvinning ved kjemikalietilsetning i injeksjonsvannet
(Master thesis, 2010-06-01)En stor del av verdens hydrokarbonreserver finnes i karbonater. Karbonatreservoarer er komplekse fordi reservoarbergarten ofte er sprø og sprekker lett. Mineralsammensetningen av karbonater gjør poreoverflaten mer tilbøyelig ... -
Vanninjektivitet og svekking av kalk under injeksjon av kaldt vann
(Master thesis, 2014-12-05)Primær oljeutvinning ved trykkavlastning gir ofte lav utvinningsgrad, og etterlater stor restoljemetning i reservoaret. For å forbedre oljeutvinningsgraden kan andre produksjonsmetoder benyttes; vanninjeksjon har i lang ... -
Vannutfelling på rustoverflater i gassrør
(Master thesis, 2009-06-12)Målet for denne oppgaven har vært å legge et grunnlag for beregninger av vannegenskaper i adsorbert fase på rust. Egenskaper bestemmes av et antall kompliserte termodynamiske og kinetiske mekanismer, som gjør at problemstillingen ... -
Variation in relative biological effectiveness for cognitive structures in proton therapy of pediatric brain tumors
(Journal article; Peer reviewed, 2021)Background Clinically, a constant value of 1.1 is used for the relative biological effectiveness (RBE) of protons, whereas in vitro the RBE has been shown to vary depending on physical dose, tissue type, and linear energy ... -
Veksling mellom ulike fokus i et utvalg av læreres veiledning av elever under praktisk natufagsarbeid
(Master thesis, 2015-06-08)Dialogue and discourse in science classrooms have been well studied, and multiple articles have been written about both challenges and opportunities related to classroom dialogue between teacher and students. In my master's ... -
Velocity distributions in microskimmer supersonic expansion helium beams: High precision measurements and modeling
(Peer reviewed; Journal article, 2018)Supersonic molecular beams are used in many applications ranging from spectroscopy and matter wave optics to surface science. The experimental setup typically includes a conically shaped, collimating aperture, the skimmer. ... -
Vented gas and dust explosions - External explosions
(Master thesis, 2016-06-01)The use of explosion venting is a widely applied safety measure, mitigating the effects of an internal gas and dust explosion. Implementation of this safety measure does however not eliminate all risks and hazards associated ... -
Vented hydrogen deflagrations in weak enclosures: Experimental results and implications for industrial practice
(Peer reviewed; Journal article, 2019)It is common practice in industry to install equipment for hydrogen energy applications in containers and smaller enclosures. Fires and explosions represent a significant hazard for such installations (Skjold et al., 2018), ... -
Videreutvikling av instrumentering - for studier av mikroalgers vertikalmigrasjon under ulike lysforhold
(Master thesis, 2017)Mikroalger er viktige som primærprodusent i økosystem, både som næring til andre organismer men også som oksygenprodusent. Endringer av miljøforhold som lysintensitet, bølgelengde og tilgang på næringsstoffer, vil påvirke ... -
Viking and early middle ages Northern Scandinavian textiles proven to be made with hemp
(Peer reviewed; Journal article, 2013-10-18)Nowadays most plant textiles used for clothing and household are made of cotton and viscose. Before the 19th century however, plant textiles were mainly made from locally available raw materials, in Scandinavia these were: ... -
Viscous potential flow analysis of peripheral heavy ion collisions
(Peer reviewed; Journal article, 2013-02-19)The conditions for the development of a Kelvin-Helmholtz instability (KHI) for the quark-gluon plasma (QGP) flow in a peripheral heavy ion collision is investigated. The projectile and target side particles are separated ... -
Visualization and interpretation of methane hydrate growth and dissociation in synthetic porous media
(Master thesis, 2015-12-22)Sedimentary natural gas hydrates might play an important role in the future energy mix and the impact of methane release from natural gas hydrates can be significant also with respect to climate change. Vast amounts of ... -
Vorticity in peripheral collisions at the Facility for Antiproton and Ion Research and at the JINR Nuclotron-based Ion Collider fAcility
(Peer reviewed; Journal article, 2014-08-29)The flow vorticity development is studied in the reaction plane of peripheral relativistic heavy-ion reactions at energies just above the threshold of the transition to a quark-gluon plasma (QGP). Earlier calculations at ... -
W and Z boson production in p–Pb collisions at \(\sqrt{s_{\rm NN}}=5.02\) TeV
(Peer reviewed; Journal article, 2017-02)The W and Z boson production was measured via the muonic decay channel in proton-lead collisions at \(\sqrt{s_{\rm NN}}=5.02\) TeV at the Large Hadron Collider with the ALICE detector. The measurement covers backward ... -
A water droplet-powered sensor based on charge transfer to a flow-through front surface electrode
(Journal article; Peer reviewed, 2020)A water droplet sensor based on a flow-through front surface electrode is demonstrated. It is shown that a triboelectric nanogenerator based on a metal-dielectric junction can be utilized to construct simple, self-powered ... -
Water shutoff and conformance improvement: an introduction
(Journal article; Peer reviewed, 2021)This paper provides an introduction to the topic of water shutoff and conformance improvement. After indicating the volumes of water produced during oilfield operations, a strategy is provided for attacking excess water ... -
Waterflood Efficiency and Single-Phase Flow Properties of Carbonate Porous Media
(Doctoral thesis, 2009-12-17) -
Wettability effects on oil recovery mechanisms in fractured chalk
(Doctoral thesis, 2007-02-02)This thesis is a part of the ongoing project, “Oil recovery from fractured chalk reservoirs”, which is a collaboration between the Reservoir Physics Group at the University of Bergen and ConocoPhillips Research Center in ... -
What Determines the Parameters of a Propagating Streamer: A Comparison of Outputs of the Streamer Parameter Model and of Hydrodynamic Simulations
(Journal article; Peer reviewed, 2021)Electric streamer discharges (streamers) in the air are a very important stage of lightning, taking place before formation of the leader discharge, and with which an electric discharge starts from conducting objects which ...