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Sökning: WFRF:(Gustavsson Lennart)

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  • Karlsson, Mats Lennart, et al. (författare)
  • Emissioner från biobränsleeldade anläggningar mellan 0,5 och 10 MW.
  • 1992
  • Rapport (refereegranskat)abstract
    • Emissions from Heating Plant burning Biomass in the interval 0.5 - 10 MW The emissions from the heating plants in the interval 0.5 - 10 MW, burning biomass, have been investigated. The measurements have included carbon monoxide, carbon dioxide, nitrogen oxides, a number of volatile organic compounds (VOC) and polyaromatic hydrocarbons (PAH). Wood chips, wood briquettes, straw, bark, wood pellets, wood powder and peat are the fuel quantities included in the survey. The measurements were made at existing operating conditions for each plant. No adjustments to the combustion equipment were made. The measurements showed that biomass combustion can give rise to high emissions of unburnt hydrocarbons. In six out of thirteen tests, significant VOC emissions with methande, ethylene, propene and acetlyene in the interval 5 - 500 mg/MJ were recorded. In all these cases the CO emissions exceeded 1000 mg/MJ. A correlation between increasing CO content and increasing VOC content was indicated in these cases. This is most apparent for methane, which is the most abundant VOC species. In the other cases, where the CO emissions were below 500 mg/MJ, no significant VOC emissions were recorded. NOx, emissions varied for all cases between 35 and 256 mg NO2/MJ. No clear correlation between low levels of unburnt hydrocarbons and high levels of NOx could be established.
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  • Andersson, Lars, 1946, et al. (författare)
  • "Främmande språk" eller enbart engelska
  • 1982
  • Ingår i: La Espero, Svenska Esperantotidningen. - 0014-0694. ; 1982:2
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • I artikeln argumenteras för att kunskapsmålet "förmåga att tillgodogöra sig kunskapsstoff på främmande språk" bör ersätta AU-utredningens snävare mål "förmåga att tillgodogöra sig kunskapsstoff på engelska".
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  • Balk, Lennart, et al. (författare)
  • Widespread episodic thiamine deficiency in Northern Hemisphere wildlife
  • 2016
  • Ingår i: Scientific Reports. - : Nature Publishing Group. - 2045-2322. ; 6
  • Tidskriftsartikel (refereegranskat)abstract
    • Many wildlife populations are declining at rates higher than can be explained by known threats to biodiversity. Recently, thiamine (vitamin B-1) deficiency has emerged as a possible contributing cause. Here, thiamine status was systematically investigated in three animal classes: bivalves, ray-finned fishes, and birds. Thiamine diphosphate is required as a cofactor in at least five life-sustaining enzymes that are required for basic cellular metabolism. Analysis of different phosphorylated forms of thiamine, as well as of activities and amount of holoenzyme and apoenzyme forms of thiaminedependent enzymes, revealed episodically occurring thiamine deficiency in all three animal classes. These biochemical effects were also linked to secondary effects on growth, condition, liver size, blood chemistry and composition, histopathology, swimming behaviour and endurance, parasite infestation, and reproduction. It is unlikely that the thiamine deficiency is caused by impaired phosphorylation within the cells. Rather, the results point towards insufficient amounts of thiamine in the food. By investigating a large geographic area, by extending the focus from lethal to sublethal thiamine deficiency, and by linking biochemical alterations to secondary effects, we demonstrate that the problem of thiamine deficiency is considerably more widespread and severe than previously reported.
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  • Bellqvist, David, et al. (författare)
  • Closing the loop - Processing of waste by-product from aluminum recycling into useful product for the steel industry
  • 2015
  • Ingår i: Chemical Engineering Transactions. - 1974-9791 .- 2283-9216. ; 45, s. 661-666
  • Tidskriftsartikel (refereegranskat)abstract
    • During melting of aluminum scrap a slag residue is formed. The slag residue, called black dross, has no industrial use and has to be landfilled. The work presented herein aims at developing a novel treatment process for the slag, converting it into a useful product for the steel industry and thereby replacing commercially available products made from virgin material. The concept consists of flash melting black dross and lime to form a synthetic slag former for treatment of high quality steel. Results from the modelling work indicate that the overall energy savings for an extended use of the developed product at the SSAB Europe Luleå site amounts to 31 GWh/y corresponding to 8 kt CO2/y, in addition to the process removing the need for landfill of around 20 kt of black dross per year with subsequent risk of leakage of toxic compounds.
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  • Resultat 1-10 av 96
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