Sökning: "rain pH"

Visar resultat 1 - 5 av 18 avhandlingar innehållade orden rain pH.

  1. 1. Atmospheric corrosion and runoff processes on copper and zinc as roofing materials

    Detta är en avhandling från Stockholm : Materialvetenskap

    Författare :Wenle He; KTH.; [2002]
    Nyckelord :atmospheric corrosion; corrosion rate; runoff rate; copper; zinc; field study; laboratory study; roof; first flush; rain quantity; rain intensity; rain pH; dry and wet deposition; corrosion and runoff process;

    Sammanfattning : An extensive investigation with parallel field andlaboratory exposures has been conducted to elucidateatmospheric corrosion and metal runoff processes on copper andzinc used for roofing applications. Detailed studies have beenperformed to disclose the effect of various parameters on therunoff rate including: surface inclination and orientation,natural patination (age), patina composition, rain duration andvolume, rain pH, and length of dry periods inbetween rainevents. LÄS MER

  2. 2. Metal release from stainless steels and the pure metals in different media

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Gunilla Herting; KTH.; [2004]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; stainless steel; iron; chromium; nickel; metal release; artificial rain; synthetic body fluid; Materialvetenskap; TECHNOLOGY Materials science; TEKNIKVETENSKAP Teknisk materialvetenskap;

    Sammanfattning : This study has been triggered by the fact that stainless steel is being increasingly used in new applications, where possible environmental effects may be a matter of concern. When stainless steel is exposed to a given environment, a key issue is the release of small amounts of the main alloying elements iron, chromium, nickel and molybdenum. LÄS MER

  3. 3. What are the effects of natural versus human-caused acidity on stream species diversity and ecosystem functioning?

    Detta är en avhandling från Umeå : Ekologi, miljö och geovetenskap

    Författare :Zlatko Petrin; Umeå universitet.; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; acid rain; aquatic insects; biodiversity; ecosystem function; NATURAL SCIENCES Biology; NATURVETENSKAP Biologi;

    Sammanfattning : Human activities have caused acidification of freshwater systems on a large scale resulting in reduced species diversity and ecological functioning in many lakes and streams. However, many naturally acidic freshwater systems have also been found, for instance in northern Sweden. LÄS MER

  4. 4. Halogenated organic matter in precipitation

    Detta är en avhandling från Linköping : Linköpings universitet

    Författare :Krzysztof Laniewski; Linköpings universitet.; Linköpings universitet.; [1998]
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Sammanfattning : Deposition in rain and snow plays a crucial role in the regional and global redistribution of a great variety of substances. This thesis is devoted to chemical characterisation and identification of the halogenated organic compounds that are most widespread in rain and snow. LÄS MER

  5. 5. Haloacetates in precipitation

    Detta är en avhandling från Linköping : Linköpings universitet

    Författare :Lena von Sydow; Linköpings universitet.; Linköpings universitet.; [1998]
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Sammanfattning : Haloacetates are a group of fluorinated, chlorinated and brominated organic compounds that pose a potential threat to the environment, because they are present in relatively high concentrations in precipitation and they are toxic to plants. At the time the research described in this thesis was begun, it had been suggested that atmospheric degradation of chlorinated solvents and CFC replacements were responsible for the presence of haloacetates in precipitation in populous regions. LÄS MER