Sökning: "Snow"

Visar resultat 21 - 25 av 232 avhandlingar innehållade ordet Snow.

  1. 21. Environmental occurrence and fate of semifluorinated n-alkanes and perfluorinated alkyl acids present in ski waxes

    Författare :Merle M. Plassmann; Urs Berger; Michael McLachlan; Crispin Halsall; Stockholms universitet; []
    Nyckelord :Semifluorinated n-alkanes; Perfluorinated alkyl acids; ski waxes; snow; soil; fate; NATURAL SCIENCES; NATURVETENSKAP; Applied Environmental Science; tillämpad miljövetenskap;

    Sammanfattning : Highly fluorinated organic compounds are emerging environmental contaminants of concern, due to their persistence, ubiquitous distribution, bioaccumulation potential and toxicity. Ski waxes are sources of highly fluorinated chemicals to the environment that have not been investigated so far. LÄS MER

  3. 22. Snow quality in urban areas

    Författare :Maria Viklander; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; VA-teknik; Urban Water Engineering;

    Sammanfattning : The studies reported on this thesis aim to provide information and increase knowledge about the quality of urban snow and the path of pollutants. The results develop a basis for decisions regarding the prevention of environmental damage. LÄS MER

  4. 23. Snow contamination of cars: Collisions of ice particles with surfaces

    Författare :Tobias Eidevåg; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ice adhesion; Snow adhesion; coefficient of restitution; particle impacts; premelting; radar blockage;

    Sammanfattning : Seasonal snow cover on roads causes car accidents that lead to human suffering and economic loss. Snow cover decreases visibility and road-tire friction. Advanced active safety systems have been developed to cope with sudden changes in driving conditions and have been engineered to act as quickly as possible. LÄS MER

  5. 24. Quantifying the impact of winter warming on the Arctic carbon cycle

    Författare :Alexandra Pongrácz; BECC: Biodiversity and Ecosystem services in a Changing Climate; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Arctic; snow; permafrost; LPJ-GUESS; non-growing season; carbon cycling; LPJ-GUESS; Arctic; permafrost; snow; carbon cycling; non-growing season;

    Sammanfattning : The Arctic has undergone extreme changes during the last decades and is warming over twice the global average. There has been increasing interest in understanding how warming and changes in snow and rainfall will affect high-latitude ecosystems. LÄS MER

  7. 25. On LFSR based Stream Ciphers - analysis and design

    Författare :Patrik Ekdahl; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; self-shrinking generator; shrinking generator; E0; A5; sober; stream cipher; LFSR; snow; Informatics; systems theory; Informatik; systemteori;

    Sammanfattning : Stream ciphers are cryptographic primitives used to ensure privacy in digital communication. In this thesis we focus on stream ciphers built using Linear Feedback Shift Registers (LFSRs). Several different stream ciphers are analysed and new attacks are presented. In addition, two new stream ciphers are presented, both based on the same design. LÄS MER