Browsing NTNU Open by Author "Brevik, Iver Håkon"

Now showing items 41-60 of 69

    • Non-perturbative theory of dispersion interactions 

      Boström, Mathias; Thiyam, Priyadarshini; Persson, Clas; Parsons, Drew F.; Buhmann, Stefan Yoshi; Brevik, Iver Håkon; Sernelius, Bo. E. (Journal article; Peer reviewed, 2015)
      Some open questions exist with fluctuation-induced forces between extended dipoles. Conventional intuition derives from large-separation perturbative approximations to dispersion force theory. Here, we present a full ...

    • Nonperturbative theory for the dispersion self-energy of atoms 

      Thiyam, Priyadarshini; Persson, Clas; Brevik, Iver Håkon; Sernelius, Bo. E.; Boström, Mathias (Journal article; Peer reviewed, 2014)
      We go beyond the approximate series expansions used in the dispersion theory of finite-size atoms. We demonstrate that a correct, and nonperturbative, theory dramatically alters the dispersion self-energies of atoms. The ...

    • On isotropic turbulence in the dark fluid universe 

      Brevik, Iver Håkon; Gorbunova, Olesya; Nojiri, Shin'ichi; Odintsov, Sergei D. (Journal article; Peer reviewed, 2011)
      As a first part of this work, experimental information about the decay of isotropic turbulence in ordinary hydrodynamics, is used as input in FRW equations in order to investigate how an initial fraction f of turbulent ...

    • Origin of anomalously stabilizing ice layers on methane gas hydrates near rock surface 

      Li, Yang; Corkery, Robert; Carretero-Palacios, Sol; Berland, Kristian; Esteso, Victoria; Fiedler, Johannes; Milton, Kimball A.; Brevik, Iver Håkon; Boström, Mathias (Peer reviewed; Journal article, 2023)
      Gas hydrates (GHs) in water close to freezing temperatures can be stabilised via the formation of ice layers. In a recent work [Boström et al., Astron. Astrophys., A54, 650, 2021], it was found that a surface region with ...

    • Possible Expansion of Blood Vessels by Means of the Electrostrictive Effect 

      Brevik, Iver Håkon (Peer reviewed; Journal article, 2023)
      In cases when it is desirable to transport medication through blood vessels, especially when dealing with brain cancer being confronted with the narrow arteries in the brain, the blood–brain barrier makes medical treatment ...

    • Premelting and formation of ice due to Casimir-Lifshitz interactions: Impact of improved parameterization for materials 

      Li, Yang; Milton, Kimball A.; Brevik, Iver Håkon; Malyi, Alexandr I.; Thiyam, Priyandarshini; Persson, Clas; Parsons, Drew F.; Boström, Mathias (Peer reviewed; Journal article, 2022)
      Recently, the premelting and formation of ice due to the Casimir-Lifshitz interaction, proposed in early 1990s by Elbaum and Schick [Phys. Rev. Lett. 66, 1713 (1991)], have been generalized to diverse practical scenarios, ...

    • Presence of negative entropies in Casimir interactions 

      Høye, Johan Skule; Brevik, Iver Håkon; Milton, Kimball A. (Journal article; Peer reviewed, 2016)
      Negative entropy in connection with the Casimir effect at uniform temperature is a phenomenon rooted in the circumstance that one is describing a nonclosed system, or only part of a closed system. In this paper we show ...

    • Remarks on cosmological bulk viscosity in different epochs 

      Brevik, Iver Håkon; Normann, Ben David (Peer reviewed; Journal article, 2020)
      The intention of this paper is mainly two-fold. First, we point out a striking numerical agreement between the bulk viscosity in the lepton era calculated by Husdal (2016) and our own calculations of the present-day bulk ...

    • Remarks on the Abraham-Minkowski problem, from the formal and from the experimental side 

      Brevik, Iver Håkon; Chaichian, Masud; Cotaescu, I. I. (Peer reviewed; Journal article, 2021)
      We analyze the Abraham–Minkowski problem known from classical electrodynamics from two different perspectives. First, we follow a formal approach, implying use of manifolds with curved space sections in accordance with ...

    • A Role for Bose-Einstein Condensation in Astrophysics 

      Ninham, Barry W.; Brevik, Iver Håkon; Malyi, Oleksandr I.; Boström, Mathias (Peer reviewed; Journal article, 2023)
      We revive a 60-year-old idea that might explain a remarkable new observation of a periodic low-frequency radio emission from a source at galactic distances (GLEAM-X J162759.5-523504.3). It derives from the observation that ...

    • Self-preserving ice layers on CO2 clathrate particles: Implications for Enceladus, Pluto, and similar ocean worlds 

      Boström, Mathias; Esteso, Victoria; Fiedler, Johannes; Brevik, Iver Håkon; Persson, Clas; Buhmann, Stefan Yoshi; Carretero-Palacios, Sol; Parsons, Drew F.; Corkery, Robert W. (Peer reviewed; Journal article, 2021)
      Context. Gas hydrates can be stabilised outside their window of thermodynamic stability by the formation of an ice layer – a phenomenon termed self-preservation. This can lead to a positive buoyancy for clathrate particles ...

    • Singular Behavior of the Dark Universe under the Effect of Thermal Radiation in Curved Spacetime 

      Brevik, Iver Håkon; Timoshkin, Alexander V. (Peer reviewed; Journal article, 2023)
      We consider the late-time accelerated universe in the Friedmann–Robertson–Walker (FRW) spacetime with a nonzero curvature, and investigate cosmological models when the cosmic fluid is taken to be inhomogeneous and viscous ...

    • Structural, impedance and electrochemical characteristics of electrical double layer capacitor devices based on chitosan: Dextran biopolymer blend electrolytes 

      Aziz, S. B.; Hamsan, Muhamad H.; Nofal, M. M.; Karim, W. O.; Brevik, Iver Håkon; Brza, M. A.; Abdulwahid, R. T.; Al-Zangana, S.; Kadir, M. F. Z. (Peer reviewed; Journal article, 2020)
      This report presents the preparation and characterizations of solid biopolymer blend electrolyte films of chitosan as cationic polysaccharide and anionic dextran (CS: Dextran) doped with ammonium iodide (NH4I) to be utilized ...

    • The study of plasticized sodium ion conducting polymer blend electrolyte membranes based on chitosan/dextran biopolymers: Ion transport, structural, morphological and potential stability 

      Asnawi, A. S. F. M.; Aziz, S. B.; Brevik, Iver Håkon; Brza, M. A.; Yusof, Y. M.; Alshehri, S. M.; Ahamad, T.; Kadir, M. F. Z. (Peer reviewed; Journal article, 2021)
      The polymer electrolyte system of chitosan/dextran-NaTf with various glycerol concentrations is prepared in this study. The electrical impedance spectroscopy (EIS) study shows that the addition of glycerol increases the ...

    • The study of structural, impedance and energy storage behavior of plasticized PVA:MC based proton conducting polymer blend electrolytes 

      Aziz, S. B.; Brevik, Iver Håkon; Brza, M. A.; Asnawi, A. S. F. M.; Dannoun, E. M. A.; Yusof, Y. M.; Abdulwahid, R. T.; Hamsan, M. H.; Nofal, M. M.; Kadir, M. F. Z. (Peer reviewed; Journal article, 2020)
      In this study, structural characterization, electrical properties and energy storage performance of plasticized polymer electrolytes based on polyvinyl alcohol/methylcellulose/ammonium thiocyanate (PVA/MC-NH4SCN) were ...

    • Synthesis of PVA/CeO2 based nanocomposites with tuned refractive index and reduced absorption edge: Structural and optical studies 

      Aziz, S. B.; Dannoun, E. M. A.; Tahir, D. A.; Hussein, S. A.; Abdulwahid, R. T.; Nofal, M. M.; Abdullah, R. M.; Hussein, A. M.; Brevik, Iver Håkon (Peer reviewed; Journal article, 2021)
      n the current study, polymer nanocomposites (NCPs) based on poly (vinyl alcohol) (PVA) with altered refractive index and absorption edge were synthesized by means of a solution cast technique. The characterization techniques ...

    • The influence of Lifshitz forces and gas on premelting of ice within porous materials 

      Boström, Mathias; Malyi, Oleksandr; Thiyam, Priyadarshini; Berland, Kristian; Brevik, Iver Håkon; Persson, Clas; Parsons, Drew F. (Journal article; Peer reviewed, 2016)
      Premelting of ice within pores in earth materials is shown to depend on the presence of vapor layers. For thick vapor layers between ice and pore surfaces, a nanosized water sheet can be formed due to repulsive Lifshitz ...

    • The reality of Casimir friction 

      Milton, Kimball A.; Høye, Johan Skule; Brevik, Iver Håkon (Journal article; Peer reviewed, 2016)
      For more than 35 years theorists have studied quantum or Casimir friction, which occurs when two smooth bodies move transversely to each other, experiencing a frictional dissipative force due to quantum electromagnetic ...

    • Thermal corrections to the Casimir effect 

      Brevik, Iver Håkon; Ellingsen, Simen Andreas; Milton, Kimball A. (Journal article; Peer reviewed, 2006)
      The Casimir effect, reflecting quantum vacuum fluctuations in the electromagnetic field in a region with material boundaries, has been studied both theoretically and experimentally since 1948. The forces between ...

    • Thermodynamic aspects of of entropic cosmology with viscosity 

      Brevik, Iver Håkon; Timoshkin, A. V. (Peer reviewed; Journal article, 2021)
      We describe the evolution of the early and late universe from thermodynamic considerations, using the generalized nonextensive Tsallis entropy with a variable exponent. A new element in our analysis is the inclusion of a ...