Blar i Department of Physics and Technology på tittel
Viser treff 198-217 av 2323
-
Chlorophyll a fluorescence lifetime reveals reversible UV-induced photosynthetic activity in the green algae Tetraselmis
(Peer reviewed; Journal article, 2015)The fluorescence lifetime is a very useful parameter for investigating biological materials on the molecular level as it is mostly independent of the fluorophore concentration. The green alga Tetraselmis blooms in summer, ... -
Classical and quantum-mechanical scaling of ionization from excited hydrogen atoms in single-cycle THz pulses
(Peer reviewed; Journal article, 2017-08-25)Excited atoms, or nanotip surfaces, exposed to strong single-cycle terahertz radiation emit electrons with energies strongly dependent on the characteristics of the initial state. Here we consider scaling properties of the ... -
Climatology of aerosol optical properties in Northern Norway and Svalbard
(Peer reviewed; Journal article, 2012-12-07)We present comparisons between estimates of the aerosol optical thickness and the °Angstr¨om exponent in Northern Norway and Svalbard based on data from AERONET stations at Andenes (69 ◦N, 16 ◦E, 379 m altitude) and Hornsund ... -
Cluster and MMS simultaneous observations of magnetosheath high speed jets and their impact on the magnetopause
(Journal article; Peer reviewed, 2020-01-31)When the supersonic solar wind encounters the Earth's magnetosphere a shock, called bow shock, is formed and the plasma is decelerated and thermalized in the magnetosheath downstream from the shock. Sometimes, however, due ... -
Cluster observations of a field aligned current at the dawn flank of a bursty bulk flow
(Peer reviewed; Journal article, 2007-06-29)This article describes observations of a bursty bulk flow (BBF) in the outer central plasma sheet. The observations are made with the Cluster satellites, located approximately 19RE downtail, close to the midnight sector ... -
CO2 Foam Dynamics During CO2 Enhanced Oil Recovery and CO2 Storage
(Doctoral thesis, 2023-10-09)Den stadig voksende befolkningen, økende velstand og økonomisk vekst fører til økende etterspørsel etter energi. Forbrenning av fossile brensler står for 80% av den globale energi produksjonen, noe som gjør det til en ... -
CO2 Foam Monitoring using Pressure and Resistivity Measurements : A Scientific Approach to Validating CO2 Foam Pilots
(Doctoral thesis, 2023-11-15)Denne doktorgradsstudien fokuserer på bruk av trykk- og resistivitetsmålinger for å overvåke effektiviteten av skum som et CO2-mobilitetskontrollmiddel i oljeproduserende reservoarer. Ideen om å bruke resistivitetsmåling ... -
CO2 Foam Stabilization with Nanoparticles and EOR in Fractured Carbonate Systems
(Master thesis, 2015-06-18)This thesis is a part of an ongoing study of CO2 foam mobility control in the Reservoir Physics group at the Department of Physics and Technology (IFT) at the University of Bergen. The goal of this thesis was to evaluate ... -
CO2 Foam Using non-ionic Surfactants : For Increased Storage Capacity and Oil Recovery
(Doctoral thesis, 2020-12-18)Large-scale carbon capture and storage is needed to achieve the target set forward by the Paris agreement; to limit global warming to 1.5 °C. The primary obstacle for implementing large-scale carbon capture and storage is ... -
CO2 Injection in Hydrate Bearing Sandstone with Excess Water
(Master thesis, 2013-05-31)It has previously been shown that methane can be produced from gas hydrates by exposing it to carbon dioxide. Since CO2 is the preferred hydrate former below 10 °C it will spontaneously replace CH4 as the guest molecule ... -
CO2 injeksjon for økt oljeutvinning i kalk
(Master thesis, 2013-05-31)Denne masteroppgaven studerer CO2 injeksjon for økt oljeutvinning i kalkstein, og hvordan parametere som sprekker, initielt vann og mobilitetskontroll påvirker oljeproduksjon. Det ble gjennomført 15 eksperimenter med ... -
CO2 mobility reduction using foam stabilized by CO2- and water-soluble surfactants
(Journal article; Peer reviewed, 2021)Foam can reduce CO2 mobility to improve the sweep efficiency during injection into subsurface geological formations for CO2 storage and enhanced oil recovery. However, CO2 foams are thermodynamically unstable, so they must ... -
CO2-Foams for Enhanced Oil Recovery and CO2 Storage
(Doctoral thesis, 2019-03-01)Human prosperity, economic growth and energy supply have shown a strong positive correlation from the start of the industrial revolution until the present. During the 20th century, cheap and reliable energy from fossil ... -
CO2-injeksjon i Utsiraformasjonen - et studie av CO2/vann-kontakten og temperaturavhengige parametere
(Master thesis, 2012-06-01)Since the start-up in 1996 over 15 Mt CO2 have been injected in to the geological formation Utsira at the commercial CO2 storage project Sleipner. The propagation of CO2 in the reservoir has been monitored by time-lapse ... -
Coherent \(\psi(2S)\) photo-production in ultra-peripheral Pb-Pb collisions at \(\sqrt{s_{\rm NN}}\)= 2.76 TeV
(Peer reviewed; Journal article, 2015-12)The ALICE Collaboration has performed the first measurement of the coherent \(\psi(2S)\) photo-production cross section in ultra-peripheral Pb-Pb collisions at the LHC. This charmonium excited state is reconstructed via ... -
Coherent \(\rho^0\) photoproduction in ultra-peripheral Pb-Pb collisions at \(\mathbf{\sqrt{\textit{s}_{\rm NN}}} = 2.76\) TeV
(Peer reviewed; Journal article, 2015-09)We report the first measurement at the LHC of coherent photoproduction of \(\rho^0\) mesons in ultra-peripheral Pb-Pb collisions. The invariant mass and transverse momentum distributions for \(\rho^0\) production are studied ... -
Coherent electron displacement for quantum information processing using attosecond single cycle pulses
(Journal article; Peer reviewed, 2020)Coherent electron displacement is a conventional strategy for processing quantum information, as it enables to interconnect distinct sites in a network of atoms. The efficiency of the processing relies on the precise control ... -
Coherent J/ψ and ψ photoproduction at midrapidity in ultra-peripheral Pb–Pb collisions at √sNN = 5.02 TeV
(Journal article; Peer reviewed, 2021)The coherent photoproduction of J/ψJ/ψ and ψ′ψ′ mesons was measured in ultra-peripheral Pb–Pb collisions at a center-of-mass energy sNN−−−√ = 5.02sNN = 5.02 TeV with the ALICE detector. Charmonia are detected in the central ... -
Coherent J/ψ photoproduction at forward rapidity in ultra-peripheral Pb–Pb collisions at √sNN = 5.02 TeV
(Peer reviewed; Journal article, 2019)The ALICE collaboration performed the first rapidity-differential measurement of coherent J/ψ photoproduction in ultra-peripheral Pb–Pb collisions at a center-of-mass energy √sNN = 5.02 TeV. The J/ψ is detected via its ... -
Coherent photoproduction of ρ 0 vector mesons in ultra-peripheral Pb-Pb collisions at √sNN = 5.02 TeV
(Journal article; Peer reviewed, 2020)Cross sections for the coherent photoproduction of ρ0 vector mesons in ultra-peripheral Pb-Pb collisions at √sNN = 5.02 TeV are reported. The measurements, which rely on the π+π− decay channel, are presented in three regions ...