Sökning: "rivers"

Visar resultat 1 - 5 av 181 avhandlingar innehållade ordet rivers.

  1. 1. How to estimate environmental persistence : Understanding persistence of organic micropollutants in rivers from a multidisciplinary perspective

    Författare :Claudia Coll Mora; Anna Sobek; Matthew MacLeod; Emma J. Rosi; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; organic micropollutants; biodegradation; persistence; rivers; flume mesocosms; Junge relationships; OECD 308 bottle incubations; Applied Environmental Science; tillämpad miljövetenskap;

    Sammanfattning : Organic micropollutants such as food additives, pharmaceuticals and personal care products are found in rivers worldwide. Persistence is a key criteria in chemical risk assessment as micropollutants that are persistent pose an exposure hazard to humans and the environment. LÄS MER

  2. 2. Atlantic salmon in regulated rivers : Migration, dam passage, and fish behavior

    Författare :Daniel Nyqvist; Larry Greenberg; Theodore Castro-Santos; Olle Calles; Scott Hinch; Karlstads universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; fish migration; fish passage; downstream migration; kelt; smolt; Biology; Biologi;

    Sammanfattning : Hydropower dams block migration routes and disrupt longitudinal connectivity in rivers, thereby posing a threat to migratory fish species. Various fish passage solutions have been implemented to improve connectivity with varying success. LÄS MER

  3. 3. "Flottningen dör aldrig" : bäckflottningens avveckling efter Ume- och Vindelälven 1945-70

    Författare :Erik Törnlund; Umeå universitet; []
    Nyckelord :SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; forestry work; timber floating; transport history; log driving; forest history; floatways; rivers; tributaries; Nothern Sweden; Economic history; Ekonomisk historia;

    Sammanfattning : The aim of this thesis has been to study and analyse in detail the process by which timber floating in tributaries was phased out. The region covered is that of the Ume and Vindel rivers and the period studied is 1945-70. The years I945-60 have been the most central to the analysis. LÄS MER

  4. 4. Shallow Brooks and Rivers Wide : A Study of Lexical and Semantic Change in English Nouns Denoting Watercourse

    Författare :Gabriella Rundblad; Dieter Kastovsky; Stockholms universitet; []
    Nyckelord :HUMANITIES; HUMANIORA; HUMANIORA; HUMANITIES; English language; Engelska språket; English; engelska;

    Sammanfattning : This study is intended to provide new insight into the change and stability of lexical fields by means of a new theoretical model for the identification, description and interpretation of the mechanisms of lexical and semantic change.The first part of the study is a detailed investigation of the origin and innovation of the nouns within the lexical field ‘watercourse’ in order to be able to account for the patterns of creation, especially in relation to the current status of the nouns. LÄS MER

  5. 5. Fate of perfluoroalkyl acids in the aquatic environment with a focus on mass balance studies

    Författare :Marko Filipovic; Urs Berger; Michael McLachlan; Crispin Halsall; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; PFAA; PFOS; AFFF; tap water; ground water; WWTP; mass balance; atmospheric deposition; rivers; Baltic Sea; Applied Environmental Science; tillämpad miljövetenskap;

    Sammanfattning : Perfluoroalkyl substances (PFASs) are man-made chemicals. Their unique properties make them beneficial for a wide range of industrial and consumer product applications, such as in aqueous film forming foam (AFFF), durable water repellent clothing, hydraulic oils and food packaging materials. LÄS MER