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Träfflista för sökning "WFRF:(Karlsson Per) ;hsvcat:2"

Sökning: WFRF:(Karlsson Per) > Teknik

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2.
  • Nzulu, Gabriel Kofi, 1974-, et al. (författare)
  • Growth and thermal stability of Sc-doped BaZrO 3 thin films deposited on single crystal substrates
  • 2023
  • Ingår i: Thin Solid Films. - : Elsevier BV. - 0040-6090 .- 1879-2731. ; 772
  • Tidskriftsartikel (refereegranskat)abstract
    • Thin films of BaZr1-xScxO3-x/2, (0 ≤ x ≤ 0.64), well known as proton conducting solid electrolytes for intermediate temperature solid oxide fuel cell, were deposited by magnetron sputtering. X-ray diffraction analysis of the as deposited films reveals the presence of single-phase perovskite structure. The films were deposited on four different substrates (c-Al2O3, LaAlO3〈100〉, LaAlO3〈110〉, LaAlO3〈111〉) yielding random, (110)- or (100)-oriented films. The stability of the as-deposited films was assessed by annealing in air at 600 °C for 2 h. The annealing treatment revealed instabilities of the perovskite structure for the (110) and randomly oriented films, but not for (100) oriented film. The instability of the coating under heat treatment was attributed to the low oxygen content in the film (understoichiometry) prior annealing combined with the surface energy and atomic layers stacking along the growth direction. An understoichiometric (100) oriented perovskite films showed higher stability of the structure under an annealing in air at 600 °C.
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3.
  • Dordlofva, Bengt, et al. (författare)
  • Arrangement for Frequency Planning in Cellular Systems
  • 1999
  • Patent (populärvet., debatt m.m.)abstract
    • The invention relates to an arrangement for frequency planning in cellular systems using a mix of wide and narrow antenna beams. The arrangement employs a dual frequency reuse for the respective wide and narrow antenna beams. According to the invention, a first frequency group is allocated to a cluster with a reuse distance sufficient for narrow beam channels and a second frequency group is allocated to a larger cluster with a reuse distance sufficent for wide beam channels. The second frequency group is a subdivision of and contained in the first frequency group. The second frequency group is the only frequency group available for wide beam channels, while all the frequencies of the two groups are available for the narrow beams channels. Generally, the wide beams are used for control channels and the narrow beams are used for traffic channels. A frequency planning in accordance with the invention makes it possible to use narrow beam traffic channels more efficiently compared to known state of the art methods which results in improved trunking efficiency.
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4.
  • Karlsson, Rose-Marie Pernilla, et al. (författare)
  • Thermodynamics of the Water-Retaining Properties of Cellulose-Based Networks
  • 2019
  • Ingår i: Biomacromolecules. - : American Chemical Society. - 1525-7797 .- 1526-4602. ; 20:4, s. 1603-1612
  • Tidskriftsartikel (refereegranskat)abstract
    • Noncrystalline cellulose-based gel beads were used as a model material to investigate the effect of osmotic stress on a cellulosic network. The gel beads were exposed to osmotic stress by immersion in solutions with different concentrations of high molecular mass dextran and the equilibrium dimensional change of the gel beads was studied using optical microscopy. The volume fraction of cellulose was calculated from the volume of the gel beads in dextran solutions and their dry content and the relation between the cellulose volume fraction and the total osmotic pressure was thus obtained. The results show that the contribution to the osmotic pressure from counterions increases the water-retaining capacity of the beads at high osmotic pressures but also that the main factor controlling the gel bead collapse at high osmotic strains is the resistance to the deformation of the polymer chain network within the beads. Furthermore, the osmotic pressure associated with the deformation of the polymer network, which counteracts the deswelling of the beads, could be fitted to the Wall model indicating that the response of the cellulose polymer networks was independent of the charge of the cellulose. The best fit to the Wall model was obtained when the Flory-Huggins interaction parameter (χ) of the cellulose-water system was set to 0.55-0.60, in agreement with the well-established insolubility of high molecular mass β-(1,4)-d-glucan polymers in water.
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  • Akselsson, Roland, et al. (författare)
  • Fysikaliska faktorer
  • 1994
  • Ingår i: Arbete Människa Teknik. - 9175224143 ; , s. 45-113
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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8.
  • Akselsson, Roland, et al. (författare)
  • Fysikaliska faktorer
  • 2005
  • Ingår i: Arbete Människa Teknik. - 9175228955 ; , s. 45-113
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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  • Resultat 1-10 av 265
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Författare/redaktör
Karlsson, Magnus, 19 ... (33)
Karlsson, Per (31)
Fahlén, Per, 1947 (20)
Andrekson, Peter, 19 ... (20)
Karlsson, Fredrik, 1 ... (17)
Larsson-Edefors, Per ... (14)
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Hansson, Per-Anders (13)
Kildal, Per-Simon, 1 ... (13)
Kylemark, Per, 1976 (13)
Karlsson Potter, Han ... (12)
Carlsson, Jan, 1962 (11)
Karlsson, Kristian, ... (11)
Stenumgaard, Peter (10)
Karlsson, Carl (10)
Ängskog, Per (10)
Alaküla, Mats (9)
Svensson, Jörgen (9)
Odenrick, Per (8)
Hedekvist, Per Olof ... (8)
Sunnerud, Henrik, 19 ... (8)
Fougstedt, Christoff ... (8)
Gertmar, Lars (7)
Mazur, Mikael, 1990 (7)
Karlsson, Anette (6)
Karlsson, Thomas (6)
Larsson, Robin, 1981 ... (6)
Ahlgren, Serina (6)
Chilo, José (6)
Bodin, Per (6)
Börjeson, Erik, 1984 (6)
Larsson, Per Tomas (5)
Nordberg Karlsson, E ... (5)
Gustafsson, Fredrik (5)
Engstrand, Per (5)
Bohgard, Mats (5)
Ask, Per (5)
Harvey, Simon (5)
Karlsson, Stig (5)
Palm, Jenny, 1973- (5)
Alvfors, Per (5)
Ellegård, Kajsa, 195 ... (5)
Karlsson, Magnus, 19 ... (5)
Moshfegh, Bahram, 19 ... (5)
Söderström, Mats, 19 ... (5)
Widén, Joakim (5)
Karlsson, Lennart (5)
Loyd, Dan (5)
Bojrup, Martin (5)
Wennhage, Per (5)
Carlberg, Ulf, 1978 (5)
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