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631.
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632.
  • Persson, Anders, 1974- (författare)
  • Kolonisatör eller turist? : Frågor och arbetsuppgifter i svenska historieläromedel under en tid av kunskapsideologisk förhandling
  • 2019
  • Ingår i: Nordic Journal of Educational History. - Umeå : Umeå University Library. - 2001-7766 .- 2001-9076. ; 6:2, s. 45-72
  • Tidskriftsartikel (refereegranskat)abstract
    • Coloniser or tourist? Questions and exercises in Swedish history textbooks, 1927-2015The history of History as a Swedish school subject has usually been based on two sources: curriculum plans and textbook narratives. Drawing upon more than 900 exercises that occur in 72 history textbooks published 1927-2015, this article primarily examines which different approaches to history that have been prearranged to the pupils during the second half of the last century. It is shown that a great majority of the exercises, throughout the whole period of time, prescribes a simple reproduction of unchallenged truths. It is also argued that both disciplinarian assignments and aesthetic tasks, seem to appear at least as often before, as after, the 1970s. Subsequently, especially in the 1990s, the exercises occasionally ask for the individual student's own opinions - without demanding them to consider any historical circumstances. Accordingly it is argued that while the former category of exercises most often enjoin the distanced view of the uninvolved tourist, the latter rather instructs the pupil to embrace the coloniser's self-centred perspective of the past.
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633.
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634.
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635.
  • Persson, Anders (författare)
  • Konsten att föra sig
  • 1989
  • Ingår i: Helsingborgs Dagblad. - 1103-9388. ; :890505
  • Recension (populärvet., debatt m.m.)
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636.
  • Persson, Anders (författare)
  • Kris och risk - diskurser över katastrofen
  • 1996
  • Ingår i: Tvärsnitt - om humanistisk och samhällsvetenskaplig forskning. - 0348-7997. ; :1/1996, s. 10-21
  • Tidskriftsartikel (refereegranskat)abstract
    • "Krismedvetande" är ett nytt ord i svenska språket. Trots att den svenska ekonomin genomgått både hög- och lågkonjunkturer under de senaste tjugo åren, har behovet av krismedvetande varit i det närmaste permanent. Har Sverige blivit ett "krissamhälle", ett samhälle som bär stora likheter med vad som i tysk debatt benämns "risikogesellschaft", risksamhälle?
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637.
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638.
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639.
  • Persson, Anders L., 1963 (författare)
  • Filler Controlled Morphology in Polymer Blends
  • 1997
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The morphology of a polymer blend can be altered very dramatically when a filler is added. Depending on the mutual interactions of the polymers and their individual interactions with the filler, many different filler distributions are possible. Inverse gas chromatography was the key tool to quantify the polymer-solid interaction potentials in terms of Lewis acid-base properties. These forecasted interaction strengths at the whisker-polymer interface coincided with the observed preferential adsorption. Selective adsorption of the minority polymer component made it form three-dimensional web structures with the whiskers in the matrix of the majority component. This ability to form co-continuous structures was quantified as electrical conductivity of blends containing the intrinsically conducting polymer poly(3-octyl thiophene). For a properly selected majority polymer the conductivity of the three-component composite increased several orders of magnitude. Interactions between polyamide-6 and the whisker surface are strong enough to perturb crystallization in a zone by the interface. Selective adsorption was exploited to create virtually highly filled composites as a non-interacting polymer was added as a processing aid. That polymer was extracted and left extreme composites comprising only whiskers and polamide-6 interphase. In order to collect data for derivation of a crystallinity gradient by the filler surface, the ratio of polyamide-6 to processing aid was varied. Once a beneficial phase morphology has been achieved, successive processing can easily rupture it unless its rheological limitations are considered. For example, the high shear rates created during injection molding ruined the co-continuous structure created during compounding of poly(styrene-co-acrylonitrile)/polyamide-6/whiskers. However, the ruptured morphology could have been restored by annealing at the processing temperature. In blends with components of comparable polymer-whisker interaction strength and substantial viscosity difference the whiskers are absorbed by the phase that minimizes the viscosity of the three-component system. Accordingly the whiskers were absorbed by the high viscosity phase unless supporting transformation of the minority low viscosity phase from dispersed to continuous. Such transformations and other shear induced morphological changes were followed as viscoelastic changes during steady and/or harmonic shear. This methodology has the prospects to become a valid instrument to optimize the processing route of blends and multicomponent systems.
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640.
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