Browsing Fysisk institutt by Title

Now showing items 3617-3636 of 3667

  • Wave equations for porous media described by the Biot model 
    Chandrasekaran, Sri Nivas; Näsholm, Sven Peter; Holm, Sverre (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Single-mode equivalent space-time representations of the acoustic wave propagating in a Biot poroelastic medium have previously been found only for asymptotic cases: In the low frequency regime, where the viscous skin depth ...
  • Wave equations of the two common sediment acoustic theories 
    Chandrasekaran, Sri Nivas; Holm, Sverre; Näsholm, Sven Peter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Two popular theories for wave propagation in sediments, the Biot poroelastic theory and the Viscous Grain Shearing (VGS) theory, have been formulated in terms of dispersion relations. The lack of explicit wave equations ...
  • Wave optics-based LEO-LEO radio occultation retrieval 
    Benzon, Hans-Henrik; Høeg, Per (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    This paper describes the theory for performing retrieval of radio occultations that use probing frequencies in the XK and KM band. Normally, radio occultations use frequencies in the L band, and GPS satellites are used as ...
  • Waves and Oscillations in Space Plasmas 
    Sato, Hiroatsu (Doctoral thesis / Doktoravhandling, 2011)
  • Weakly nonlinear ion sound waves in gravitational systems 
    Guio, Patrick; Pécseli, Hans L (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Ion sound waves are studied in a plasma subject to gravitational field giving rise to vertically inhomogeneous steady-state plasma conditions. Such systems are interesting by exhibiting a wave growth that is a result of ...
  • A Weighted Histogram-Based Tone Mapping Algorithm for CT images 
    Völgyes, David; Martinsen, Anne Catrine Trægde; Stray-Pedersen, Arne; Waaler, Dag; Pedersen, Marius (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Computed Tomography (CT) images have a high dynamic range, which makes visualization challenging. Histogram equalization methods either use spatially invariant weights or limited kernel size due to the complexity of pairwise ...
  • Well defined nanoparticles through controlled non-equilibrium micellization of block copolymers 
    Resvold, Line Trosterud (Master thesis / Masteroppgave, 2016)
    The aim of this work is to investigate if size and morphology of nanoparticles can be controlled by changing the hydrophilic ratio of the amphiphilic polymers, changing polymer concentration or simply by changing the ...
  • What makes entangeled photons entangeled? An experimental comparison between entangeled photons and weak femtosecond pulses 
    Thörn, Andreas Pierre (Doctoral thesis / Doktoravhandling, 2015)
  • What Does It Mean to “Make Sense” of Physics? 
    Odden, Tor Ole Bigton (Journal article / Tidsskriftartikkel / SubmittedVersion, 2021)
    What does it mean to “make sense” of physics? It’s not a simple question. Most people have an intuitive feeling for when things do (or do not) make sense to them. But putting this feeling into words—especially actionable ...
  • What Is Light? Students’ Reflections on the Wave-Particle Duality of Light and the Nature of Physics 
    Henriksen, Ellen Karoline; Angell, Carl; Vistnes, Arnt Inge; Bungum, Berit (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    Quantum physics describes light as having both particle and wave properties; however, there is no consensus about how to interpret this duality on an ontological level. This article explores how pre-university physics ...
  • Which cusp upflow events can possibly turn into outflows? 
    Skjæveland, Åsmund; Moen, Jøran Idar; Carlson, Herbert C. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    Two sequences, before and after magnetic noon, respectively, of poleward moving auroral forms with associated upflows situated above the European Incoherent Scatter Svalbard Radar allowed close study of ion upflow dynamics. ...
  • White matter integrity and cognition in Parkinson's disease: a cross-sectional study 
    Auning, Eirik; Kjærvik, Veslemøy Krohn; Selnes, Per; Aarsland, Dag; Haram, Astrid; Bjørnerud, Atle; Hessen, Erik; Esnaashari, Abdolreza; Fladby, Tormod (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    Objective We used diffusion tensor imaging (DTI) to test the following hypotheses: (1) there is decreased white matter (WM) integrity in non-demented Parkinson’s disease (PD), (2) WM integrity is differentially reduced in ...
  • Why the hydrodynamics is valid at early stage of heavy-ion collisions? 
    Bravina, Larissa; Zabrodin, Evgeny (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Evolution of hot and dense nuclear matter produced in central Au+Au collisions at energies of NICA, FAIR, and SPS is studied within two transport models. Two interesting features in the matter behaviour are observed almost ...
  • A wide range and high resolution Time-to-Digital Converter for use in LIDARRestricted Access 
    Gholami, Haiatullah (Master thesis / Masteroppgave, 2021)
  • Widespread Changes in White Matter Microstructure After a Day of Waking and Sleep Deprivation 
    Elvsåshagen, Torbjørn; Norbom, Linn Christin Bonaventure; Pedersen, Per Øystein Heiberg; Quraishi, Sophia H.; Bjørnerud, Atle; Malt, Ulrik Fredrik; Groote, Inge Rasmus; Westlye, Lars Tjelta (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Background Elucidating the neurobiological effects of sleep and waking remains an important goal of the neurosciences. Recently, animal studies indicated that sleep is important for cell membrane and myelin maintenance in ...
  • Wireless Embedded Microcontroller System for Bioimpedance Measurements 
    Brataas, Patrick Hisni (Master thesis / Masteroppgave, 2014)
    In this thesis the design and prototype of a bioimpedance measurement system is described. The system is wireless and battery powered. A custom analog front-end has been made to be able to do bioimpedance measurements. It ...
  • Wireless Power Receiving Unit. Analysis, design and implementation of inductive power receiving unit for wireless circuits 
    Chauhan, Rikesh (Master thesis / Masteroppgave, 2017)
    Going wireless has revolutionised handheld and wearable devices today. On comparing battery technology with other aspects of portable device technology, it has been a bottleneck in new innovation of miniaturised electronic ...
  • A wireless ultrasonic positioning network using off-the-shelf devices 
    Järve, Martin (Master thesis / Masteroppgave, 2023)
    The Global Positioning System (GPS) is the standard technology for outdoor positioning, but it cannot be used for accurate indoor positioning due to scattering and attenuation of GPS signals. A popular alternative is to ...
  • Witness electron beam injection using an active plasma lens for a proton beam-driven plasma wakefield accelerator 
    Kim, Seong-Yeol; Chung, M.; Sjobak, Kyrre Ness; Adli, Erik; Doebert, Steffen; Dayyani, M.; Yoon, E. S.; Nam, I.; Hahn, G. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    An active plasma lens (APL) focuses the beam in both the horizontal and vertical planes simultaneously using a magnetic field generated by a discharge current through the plasma. A beam size of 5–10  μm can be achieved ...
  • W±-boson production in p–Pb collisions at √sNN = 8.16 TeV and Pb–Pb collisions at √sNN = 5.02 TeV 
    Acharya, S.; Adamová, D.; Adler, A.; Aglieri Rinella, Rinella; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahn, S.U.; Ahuja, I.; Al-Turany, M.; Alessandro, B.; Alfanda, H.M.; Alfaro Molina, Molina; Ali, B.; Ali, Y.; Alici, A.; Alme, Johan; Arsene, Ionut Cristian; Bodova, Tea; Djuvsland, Øystein; Eikeland, Viljar Nilsen; Ersdal, Magnus Rentsch; Helstrup, Håvard; Hetland, Kristin Fanebust; Kileng, Bjarte; Langøy, Rune; Lien, Jørgen André; Lofnes, Ingrid Mckibben; Malik, Qasim Waheed; Neagu, Alexandra; Nesbø, Simon Voigt; Nystrand, Joakim Ingemar; Rehman, Attiq Ur; Reme-Ness, Haakon André; Richter, Matthias; Røed, Ketil; Röhrich, Dieter; Sætre, Jon-Are; Skaali, Toralf Bernhard; Solheim, Emilie Haugland; Storehaug, Ida Torkjellsdatter; Storetvedt, Maksim Melnik; Tambave, Ganesh Jagannath; Tveter, Trine Spedstad; Ullaland, Kjetil; Wagner, Boris; Wikne, Jon Christopher; Yang, Shiming; Yuan, Shiming; ALICE, Collaboration (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)