Search for dissertations about: "Sundsvall"
Showing result 21 - 25 of 32 swedish dissertations containing the word Sundsvall.
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21. Organic micropollutants in highway stormwater and the role of a gross pollutant trap-biofilter stormwater treatment train
Abstract : The studies which this thesis is based on assessed the stormwater quality in a highway catchment located in Sundsvall, Sweden, and examined the performance of a gross pollutant trap (GPT)-biofilter stormwater treatment train (TT) downstream of the catchment, in terms of removal efficiency, intra-event variability, and environmental risk reduction of organic micropollutants (OMPs) for the receiving water body. Assessing the occurrence and event mean concentrations (EMCs) of all OMPs in the catchment revealed that bisphenol A (BPA), octylphenol (OP), nonylphenol (NP), five carcinogenic and four non-carcinogenic polycyclic aromatic hydrocarbons (PAHs), and C16-C40 fractions of petroleum hydrocarbons (PHCs) all potentially pose an environmental risk to freshwater (EMCs >PNEC: predicted non-effect concentration), while alkylphenolethoxylates, six low- molecular weight PAHs, and lighter fractions of PHCs (C10-C16) do not occur at problematic levels. READ MORE
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22. Optimizing prehospital acute stroke care in the presence of economic constraints
Abstract : Mechanical thrombectomy (MT) has become standard of care for acute anterior circulation ischaemic stroke due to large vessel occlusion since the launch of second-generation stent retrievers for clinical use nearly a decade ago. Up until recently, the treatment was exclusively performed at university hospitals in Sweden. READ MORE
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23. The Practice of Newspaper Ownership: Fifty Years of Control and Influence in the Swedish Local Press
Abstract : This dissertation deals with a perennial theme in both public and academic debate: how ownership is exercised in the news media. It does so by exploring the main agency through which ownership control is expected to be exerted in the individual media firm: the board of directors. READ MORE
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24. Allergic diseases and bronchial hyperreactivity in Estonian children in relation to environmental influences
Abstract : This thesis is based on the cross-sectional and prospective study of Estonian children. The aim of this thesis was to assess the prevalence of allergic diseases and respiratory symptoms in Estonian schoolchildren and in young children, to study environmental risk factors for allergic diseases and repiratory symptoms. READ MORE
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25. Effects of wood ash on freshwater organisms and aquatic forest ecosystems
Abstract : Wood ash application (WAA) has been recommended mainly for two reasons; i) to avoid depletion of minerals in the soil due to whole tree harvest in the forestry and ii) to mitigate harmful effects of acidification of soil and surface waters. In conclusion, the effects on terrestrial ecosystems and, especially, tree growth, can be attributed to the properties of the ash, the dose applied and the specific site at which the ash is applied. READ MORE