Now showing items 655-674 of 1627

    • Low Salinity Waterflooding in Combination with Surfactant/Polymer. A Field Scale Simulation Study of Hybrid EOR 

      Pedersen, Vilde Loug (Master thesis, 2018-06-27)
      It is projected that 77% of energy consumption will originate from fossil fuels in 2040, indicating a continuous demand for crude oil [1]. Nevertheless, more than half of the hydrocarbons produced at present originate from ...
    • Low-energy surface vibration measurements on the alpha-quartz (0001) surface 

      Luneng, Jenny Louise (Master thesis, 2011)
      Despite the enormous range of usages, only little is known about the dynamic and structural properties of quartz (SiO2) surfaces on the atomic scale. The main reason for this is probably that quartz is an insulator, with ...
    • Lower-Hybrid Drift Waves Driving Electron Nongyrotropic Heating and Vortical Flows in a Magnetic Reconnection Layer 

      Chen, Li-Jen; Wang, Shan; Le Contel, Olivier; Rager, A.; Hesse, Michael; Drake, J. F.; Dorelli, J.; Ng, J.; Bessho, Naoki; Graham, D. B.; Wilson, Lynn B.; Moore, T. E.; Giles, B. L.; Paterson, W.; Lavraud, B.; Genestreti, K.; Nakamura, Rumi; Khotyaintsev, Yuri V.; Ergun, R.E.; Torbert, Roy B.; Burch, J. L.; Pollock, C.; Russell, Christopher T.; Lindqvist, Per-Arne; Avanov, Levon (Journal article; Peer reviewed, 2020)
      We report measurements of lower-hybrid drift waves driving electron heating and vortical flows in an electron-scale reconnection layer under a guide field. Electrons accelerated by the electrostatic potential of the waves ...
    • Lower-thermosphere–ionosphere (LTI) quantities: current status of measuring techniques and models 

      Palmroth, Minna; Grandin, Maxime; Sarris, Theodoros E.; Doornbos, Eelco; Tourgaidis, Stylianos; Aikio, Anita; Buchert, Stephan C.; Clilverd, Mark A.; Dandouras, I; Heelis, Roderick A.; Hoffmann, A; Ivchenko, N.; Kervalishvili, G.; Knudsen, D.; Kotova, A; Liu, H.-L.; Malaspina, D; March, G.; Marchaudon, A; Marghitu, Octav; Matsuo, T; Miloch, Wojciech Jacek; Moretto, Therese; Mpaloukidis, D; Olsen, NIls; Pfaff, R.; Papadakis, K; Pirnaris, Panagiotis; Siemes, C.; Stolle, Claudia; Suni, J.; van den IJssel, J.; Verronen, Pekka T.; Visser, P.; Yamauchi, Masatoshi (Journal article; Peer reviewed, 2021)
      The lower-thermosphere–ionosphere (LTI) system consists of the upper atmosphere and the lower part of the ionosphere and as such comprises a complex system coupled to both the atmosphere below and space above. The atmospheric ...
    • Luminosity determination in pp collisions at s=7 TeV using the ATLAS detector at the LHC 

      ATLAS, Collaboration; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdelalim, A. A.; Buanes, Trygve (Peer reviewed; Journal article, 2011-04-27)
      Measurements of luminosity obtained using the ATLAS detector during early running of the Large Hadron Collider (LHC) at s=7 TeV are presented. The luminosity is independently determined using several detectors and multiple ...
    • Læring av naturfag og matematikk gjennom prosjekter i teknologi og design 

      Kolstø, Stein Dankert (Journal article, 2006)
      Jeg nærer en uro. Fagområdet teknologi og design skal inkluderes i matematikkfaget, samt i naturfag og kunst og håndverk. Men vil elevene kunne lære naturfag og matematikk eller få økt innsikt i hvordan anvende naturfag ...
    • Magnetic coordinate systems 

      Laundal, Karl Magnus; Richmond, Arthur D. (Peer reviewed; Journal article, 2017-03)
      Geospace phenomena such as the aurora, plasma motion, ionospheric currents and associated magnetic field disturbances are highly organized by Earth’s main magnetic field. This is due to the fact that the charged particles ...
    • Magnetic Effects of Plasma Pressure Gradients in the Upper F Region 

      Laundal, Karl Magnus; Hatch, Spencer Mark; Moretto, Therese (Peer reviewed; Journal article, 2019)
      The Swarm satellites fly at altitudes that at polar latitudes are generally assumed to only contain currents that are aligned with the local magnetic field. Therefore, disturbances along the main field direction are mainly ...
    • Magnetic Reconnection in a Quasi-Parallel Shock: Two-Dimensional Local Particle-in-Cell Simulation 

      Bessho, Naoki; Chen, Lijen; Wang, Shan; Hesse, Michael; Wilson, Lynn B. (Peer reviewed; Journal article, 2019)
      Magnetic reconnection in a quasi‐parallel bow shock is investigated with two‐dimensional local particle‐in‐cell simulations. In the shock transition and downstream regions, large amplitude magnetic fluctuations exist, and ...
    • Magnetic Reconnection in Three Dimensions: Modeling and Analysis of Electromagnetic Drift Waves in the Adjacent Current Sheet 

      Ergun, Robert E; Hoilijoki, Sanni; Ahmadi, N.; Schwartz, S.J.; Wilder, F.D.; Drake, James F.; Hesse, Michael; Shay, Michael A.; Ji, H.; Yamada, M; Graham, Daniel B.; Cassak, P.A.; Swisdak, M; Burch, J. L.; Torbert, R.B.; Holmes, JC; Stawarz, JE; Goodrich, Katherine A; Eriksson, S.; Strangeway, Robert J.; LeContel, O (Journal article; Peer reviewed, 2019)
      We present a model of electromagnetic drift waves in the current sheet adjacent to magnetic reconnection at the subsolar magnetopause. These drift waves are potentially important in governing 3‐D structure of subsolar ...
    • Magnetic Resonance Imaging of Hydrate Phase Transitions in Sediments 

      Veland, Veronica Flæsland (Master thesis, 2017-12-21)
      Natural gas hydrates, simplified described as gas compressed in ice, are a substance existing in large quantities around the world. Their existence requires elevated pressures and low temperature. They are therefore found ...
    • Magnetic Resonance Imaging of Methane Hydrate Formation and Dissociation in Sandstone with Dual Water Saturation 

      Almenningen, Stian; Fotland, Per; Ersland, Geir (Peer reviewed; Journal article, 2019-08-22)
      This paper reports formation and dissociation patterns of methane hydrate in sandstone. Magnetic resonance imaging spatially resolved hydrate growth patterns and liberation of water during dissociation. A stacked core ...
    • Magnetospheric Multiscale Observations of an Expanding Oxygen Wave in Magnetic Reconnection 

      Kolstø, Håkon Midthun; Norgren, Astrid Elisabet Cecilia; Hesse, Michael; Chen, Li-Jen; Tenfjord, Paul; Spinnangr, Susanne Flø; Kwagala, Norah Kaggwa (Journal article; Peer reviewed, 2021)
      Heavier plasma species such as oxygen ions can have a large impact on the magnetic reconnection process. It has been hypothesized that the acceleration of demagnetized oxygen ions by the Hall electric field will lead to ...
    • Magnetospheric response and reconfiguration times following IMF By reversals 

      Tenfjord, Paul Arne Riksheim; Østgaard, Nikolai; Strangeway, Robert J.; Haaland, Stein; Snekvik, Kristian; Laundal, Karl Magnus; Reistad, Jone Peter; Milan, Stephen Eric (Peer reviewed; Journal article, 2017-01)
      The interaction between the interplanetary magnetic field (IMF) and the geomagnetic field at the dayside magnetopause leads to transfer of momentum and energy which changes the magnetospheric configuration, but only after ...
    • Manipulating dynamical Rabi-splitting with two-color laser pulses 

      Agueny, Hicham; Taoutioui, Abdelmalek; Adnani, Younes; Makhoute, Abdelkader (Peer reviewed; Journal article, 2019)
      We theoretically investigate strong-field ionization of hydrogen atoms by orthogonally polarized two-color (OTC) laser pulses consisting of a fundamental field that is resonant with the 1s − 2p transition and its second ...
    • Mapping collinear in-medium parton splittings 

      Dominguez, Fabio; Milhano, Jose; Salgado, Carlos; Tywoniuk, Konrad; Vila, Victor (Journal article; Peer reviewed, 2020-01-07)
      We map the spectrum of 1→2 parton splittings inside a medium characterized by a transport coefficient q^ onto the kinematical Lund plane, taking into account the finite formation time of the process. We discuss the distinct ...
    • Mapping Gas Hydrate Dynamics in Porous Media : Experimental Studies of Gas Hydrates as a Source of CH4 and Sink for CO2 

      Almenningen, Stian (Doctoral thesis, 2020-03-20)
      The world needs more energy and the energy has to be more sustainable with respect to carbon dioxide (CO2) emissions. This is the backdrop for studying the diverse applications of gas hydrates in nature. The ice-like ...
    • Marine seismics with a pulsed combustion source and Pseudo Noise codes 

      Askeland, Bjørn; Hobæk, Halvor; Mjelde, Rolf (Peer reviewed; Journal article, 2007-03)
      There has been an ongoing debate for years of how dangerous seismic surveys are with respect to marine life. Marine seismics is today dominated by airgun technology, where high energy is generated by a release of compressed ...