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Sökning: db:Swepub > Övrigt vetenskapligt/konstnärligt > Annan publikation

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  • A Farewell to Critique?
  • 2020
  • Ingår i: Konsthistorisk tidskrift/Journal of Art History. - : Informa UK Limited. - 0023-3609 .- 1651-2294. ; 89:2
  • Annan publikation (övrigt vetenskapligt/konstnärligt)
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3.
  • A. Manneh, Ilana, et al. (författare)
  • Progression in action for developing chemical knowledge
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • In this paper, we discuss the well-known teaching challenge of how to provide undergraduate students with basic chemistry knowledge without making them experience these basics as meaningless and unintelligible. First, we situate the challenge in a classic dilemma: should we teach the necessary basic facts before the chemical explanations or should the explanations be taught before or in parallel to these facts? Here we draw on examples from interviews with graduate students reflecting on their experiences regarding their studies at the undergraduate level. Second, we suggest a way out of the dilemma, through a shift in perspective from the typical progression of facts and explanations towards a purpose and activity-based progression. We conclude with a discussion of implications of such a shift for university chemistry education together with suggestions for future research.
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4.
  • A. Marques, Ana F., et al. (författare)
  • The Seven Sisters Hydrothermal System : First Record of Shallow Hybrid Mineralization Hosted in Mafic Volcaniclasts on the Arctic Mid-Ocean Ridge
  • 2020
  • Ingår i: Minerals. - : MDPI AG. - 2075-163X.
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • We document the discovery of an active, shallow, seafloor hydrothermal system (known as the Seven Sisters Vent Field) hosted in mafic volcaniclasts at a mid-ocean ridge setting. The vent field is located at the southern part of the Arctic mid-ocean ridge where it lies on top of a flat-topped volcano at ~130 m depth. Up to 200 deg C phase-separating fluids vent from summit depressions in the volcano, and from pinnacle-like edifices on top of large hydrothermal mounds. The hydrothermal mineralization at Seven Sisters manifests as a replacement of mafic volcaniclasts, as direct intraclast precipitation from the hydrothermal fluid, and as elemental sulfur deposition within orifices. Barite is ubiquitous, and is sequentially replaced by pyrite, which is the first sulfide to form, followed by Zn-Cu-Pb-Ag bearing sulfides, sulfosalts, and silica. The mineralized rocks at Seven Sisters contain highly anomalous concentrations of ‘epithermal suite’ elements such as Tl, As, Sb and Hg, with secondary alteration assemblages including silica and dickite. Vent fluids have a pH of ~5 and are Ba and metal depleted. Relatively high dissolved Si (~7.6 mmol/L Si) combined with low (0.2–0.4) Fe/Mn suggest high-temperature reactions at ~150 bar. A delta-13C value of -5.4 permil in CO2 dominated fluids denotes magmatic degassing from a relatively undegassed reservoir. Furthermore, low CH4 and H2 (<0.026 mmol/kg and <0.009 mmol/kg, respectively) and 3He/4He of ~8.3 R/Racorr support a MORB-like, sediment-free fluid signature from an upper mantle source. Sulfide and secondary alteration mineralogy, fluid and gas chemistry, as well as delta-34S and 87Sr/86Sr values in barite and pyrite indicate that mineralization at Seven Sisters is sustained by the input of magmatic fluids with minimal seawater contribution. 226Ra/Ba radiometric dating of the barite suggests that this hydrothermal system has been active for at least 4670 +/- 60 yr.
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  • Aagaard, Sunniva M.D. 1977-, et al. (författare)
  • Homoploid hybridization in Central European Diphasiastrum (Lycopodiaceae).
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • Three species of homoploid hybrid origin are commonly recognized among Central European Diphasiastrum, and reticulate evolutionary events have for a long time been acknowledged as an important factor contributing to the species count in the genus. Presented evidence obtained from molecular data has until recently been scarce and inconclusive. Recent studies have, however, documented reticulate phylogenetic patterns involving all putative parental combinations reported from Central Europe. Reciprocal crosses involving the same parental combinations have also been confirmed. In order to further explore these putative reticulate events, admixture analyses using a Bayesian approach as implemented in the program NewHybrids are conducted on an expanded dataset obtained from six Central European populations from where putative hybrid taxa are reported. A majority of the accessions included in the analyses were inferred to represent pure bred D. alpinum, D. complanatum, D. tristachyum, F1 hybrids, F2 hybrids or backcrosses with one of the parent species. Accessions displaying ambiguous classification were found in both allopatric parent populations as well as in Central European hybrid populations. Presented results indicate the presence of frequently occurring hybrid zones with first and second generation hybrids as well as backcrosses.
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9.
  • Aagaard, Sunniva M.D. 1977-, et al. (författare)
  • Reticulate phylogenetic patterns in diploid European Diphasiastrum (Lycopodiaceae).
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • In Central Europe, three species belonging to Diphasiastrum are considered to be of homoploid hybrid origin. Diphasiastrum issleri is suggested to have originated from a cross between D. alpinum and D. complanatum, D. oellgaardii from D. alpinum and D. tristachyum, and D. zeilleri from D. complanatum and D. tristachyum. Variation at three nuclear regions and two chloroplast microsatellites verify the presence of all three putative parental combinations in Europe. Data obtained with Feulgen DNA image densitometry confirms that all specimens displaying such pattern are diploid. Also, two of three parental combinations have probably arisen repeatedly, implied by the occurrence of chloroplast haplotypes associated with different parents. The presented dataset cannot be used as argument for the existence of independent evolutionary entities hybrid origin. This is nonetheless an important first step in order to address the influence of reticulate evolutionary events in European Diphasiastrum. 
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10.
  • Aagerup, Ulf, 1969- (författare)
  • To sell or not to sell: overweight users’ effect on fashion assortments
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • Overweight people claim to be mistreated by the fashion industry. Fashion companies disagree. Despite the controversy, actual research has been scarce. This study compares the sizes of clothes the four leading mass marketing fashion retailers in Sweden offer to the body sizes of the population. Although branding theory would support the idea of rejecting fat consumers to improve user imagery for fashion brands, such practices were not evident. The main contribution of this paper is that it provides the first quantified empirical evidence on the theory of typical user imagery.In the discussion, it is posited that although mass market fashion brands should be susceptible to negative user imagery related to overweight and obese users, the companies avoid such problems by making garments that are not directly attributable to a specific brand, thus mitigating the negative effect of overweight and obese user imagery. 
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