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Träfflista för sökning "hsv:(LANTBRUKSVETENSKAPER) srt2:(2000-2009)"

Sökning: hsv:(LANTBRUKSVETENSKAPER) > (2000-2009)

  • Resultat 1-10 av 4349
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1.
  • Abrahamsson, Lillemor, et al. (författare)
  • Behov under livscykeln och varianter av kost
  • 2006
  • Ingår i: Näringslära för högskolan. - : Liber AB, Stockholm. - 9147053550 ; , s. 356-393
  • Bokkapitel (populärvet., debatt m.m.)
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2.
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3.
  • Abrahamsson, Lillemor, et al. (författare)
  • Principles of nutritional assessment
  • 2006
  • Ingår i: Scandinavian Journal of Food and Nutrition. - 1748-2976 .- 1748-2984. ; 50:4, s. 177-177
  • Recension (populärvet., debatt m.m.)
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4.
  • Abrahamsson, Lillemor, et al. (författare)
  • Proteiner
  • 2006
  • Ingår i: Näringslära för högskolan. - : Liber AB, Stockholm. - 9147053550 ; , s. 131-165
  • Bokkapitel (populärvet., debatt m.m.)
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5.
  • Abrahamsson, Markus, et al. (författare)
  • Saproxylic beetle assemblages in artificially created high-stumps of spruce (Picea abies) and birch (Betula pendula/pubescens) – does the surrounding landscape matter?
  • 2009
  • Ingår i: Insect Conservation and Diversity. - : Wiley. - 1752-458X .- 1752-4598. ; 2, s. 284-294
  • Tidskriftsartikel (refereegranskat)abstract
    • Abstract. 1. To create high-stumps (snags) is a common conservation action during final felling in Swedish production forests. However, many wood-living beetle species are only found in certain areas with higher overall biodiversity, so called hotspots. It has been argued that it is efficient to concentrate conservation efforts to hotspots. 2. The saproxylic beetle fauna was sampled on ten clearcuts inside hotspots and ten clearcuts outside the hotspots. They were collected with window traps mounted on 2- and 4-year-old spruce and birch high-stumps. We also used environmental data (e.g. tree species composition) to confirm differences between the surroundings of two, the clearcut types. 3. High-stumps on the hotspot clearcuts did not attract more saproxylic beetle species, or red-listed species, than high-stumps outside the hotspots. The environmental data showed that the clearcuts differed in several important aspects, for instance, were there a higher proportion of broadleaved trees around the hotspot compared with the clearcuts outside the hotspots. In a Canonical Correspondence Analysis, the proportion of coniferous and broadleaved forest was an important explanatory variables. The hotspot variable did contribute significantly in explaining the beetle composition on the birch high-stumps, but not on the spruce high-stumps. 4. In general, the study suggests that concentrating high-stumps to hotspot areas will not benefit more species. However, the result indicates birch high-stumps could be prioritised in a biologically rich landscape. The hotspot effect may be more noticeable in the future as the high-stumps decay and their importance for late successional species increase
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6.
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7.
  • Adamopoulos, Stergios, et al. (författare)
  • Dimensional changes of extracted and non-extracted small wood specimens of black locust (Robinia pseudoacacia L.)
  • 2003
  • Ingår i: European Journal of Wood and Wood Products. - : Springer. - 0018-3768 .- 1436-736X. ; 61:4, s. 264-268
  • Tidskriftsartikel (refereegranskat)abstract
    • From straight grained heartwood of black locust (Robinia pseudoacacia L.), specimens, 3 cm×3 cm in cross section and 0.5 mm (or 10 mm) in axial direction, were cut and used for the determination of dimensional changes and the rate of tangential swelling. Mean radial, tangential and axial shrinkage was 5.30%, 6.67% and 0.16%, respectively, while the coefficient of anisotropy was 1.26. Half of the specimens for the determination of the rate of tangential swelling were extracted for 48 h with distilled hot water. The tangential dimensional change and the time taken to attain half maximum swelling in air-dry and oven-dry specimens were assessed according to a common technique. Extractive removal resulted in an increase of the total magnitude of tangential swelling in both air-dry and oven-dry specimens. However, no significant differences in time taken to attain half maximum swelling between air-dry and oven-dry specimens were observed after extraction. The rate of tangential swelling was lower in air-dry specimens than in oven-dry specimens after 30 min of immersion in water when were non-extracted and after 5 min of immersion in water when were extracted. Extracted air-dry specimens had a greater rate of tangential swelling than non-extracted air-dry specimens and the same occurred for oven-dry specimens. Extraction resulted in a higher diffusion coefficient for air-dry specimens. The diffusion coefficient calculated for non-extracted air-dry specimens (0.901×10−4 cm2/min) showed that black locust is a difficult species to impregnate.
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8.
  • Adamopoulos, Stergios (författare)
  • Flexural properties of black locust (Robinia pseudoacacia L.) small clear wood specimens in relation to the direction of load application
  • 2002
  • Ingår i: European Journal of Wood and Wood Products. - : Springer. - 0018-3768 .- 1436-736X. ; 60:5, s. 325-327
  • Tidskriftsartikel (refereegranskat)abstract
    • Values of pure moduli of elasticity (PMOE), experimental modulus of elasticity (MOE) in static bending and moduli of rigidity (GLR, GLT) were calculated in juvenile and mature black locust defect-free small wood specimens after loading in static bending alternately on true radial and tangential surfaces. For both juvenile and mature specimens, no significant differences (t-test, 95% probability level) were found between the radial and tangential moduli of elasticity and rigidity. Values of PMOE were found to be 27–32% higher than the corresponding values of MOE at the 15:1 span-to-depth ratio.
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9.
  • Adamopoulos, Stergios (författare)
  • Influence of hot-water extractives on radial and tangential shrinkage of black locust wood (Robinia pseudoacacia L.)
  • 2002
  • Ingår i: European Journal of Wood and Wood Products. - : Springer. - 0018-3768 .- 1436-736X. ; 60:5, s. 377-378
  • Tidskriftsartikel (refereegranskat)abstract
    • IntroductionRemoval of extractives increases the shrinkage and swelling of wood (Nearn 1955, Salamon and Kozak 1968, Cooper 1974, Taylor 1974). The effect of progressive extraction on the above properties has not been investigated much. In oak (Quercus conferta L.), a forest species rich in extractives, the shrinkage progressively increased with progressive extraction (Voulgaridis et al. 1980). In black locust (Robinia pseudoacacia L.), much of the main-stem volume is comprised of heartwood, characterized by the presence of dark yellow-brown extractives. While the extractives of black locust give the heartwood its distinctive color and decay resistance, they comprise only 6.2 to 8.3% of the dry weight of the main stem (Stringer 1992). Hot-water extractives range from 5.2 to 8.6% (Hart 1968, So et al. 1980). The present study was primarily undertaken to determine whether the progressive removal of hot-water extractives affects the radial and tangential shrinkage of black locust heartwood.
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10.
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