Sökning: "Outdoor ageing"

Visar resultat 1 - 5 av 12 avhandlingar innehållade orden Outdoor ageing.

  1. 1. Ageing and characterisation of semiconducting glazes

    Författare :Heike Ullrich; [2002]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; outdoor insulation; HV-DC AC system; field monitoring; semiconducting surface insulator; ageing; laboratory testing;

    Sammanfattning : .... LÄS MER

  2. 2. Influence of Ageing on Material Properties at Interfaces in Composite Insulators

    Författare :Johan Andersson; [2009]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; composite insulators; ageing; silicone rubber; salt fog test; Outdoor insulation; inclined plane test; interfaces;

    Sammanfattning : High quality of internal interfaces in composite insulators for high voltage applications is necessary for securing durability of their functionality. Weak macroscopic interfaces between the glass fibre reinforced (FRP) epoxy core and the silicone rubber (SIR) housing, such as spots with reduced bonding or a loss of the adhesion as well as presence of foreign contaminants, can appear to have an accelerating effect on the evolution of ageing processes, though it may take years before the first signs of processes endangering the insulator function appear. LÄS MER

  3. 3. Effects of Corona and Ozone Exposure on Properties of Polymeric Materials for High Voltage Outdoor Applications

    Författare :Bin Ma; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; surface resistivity; silicone rubber; nanocomposite; Outdoor insulation; ozone treatment; dielectric response; hydrophobicity; corona treatment; composite insulation; volume resistivity; ageing.; mechanical strength;

    Sammanfattning : Despite the past four decades of service experiences with polymeric insulators in power systems all over the world, an adequate standard allowing for proper selection of polymeric materials for applications in high voltage outdoor environments has still been lacking. Therefore CIGRE Working Group D1. LÄS MER

  4. 4. Optical Efficiency of Low-Concentrating Solar Energy Systems with Parabolic Reflectors

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Maria Brogren; Uppsala universitet.; [2004]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering physics; Photovoltaic cells; Photovoltaic-thermal systems; Parabolic reflectors; Optical properties; Reflector materials; Optical efficiency; Accelerated ageing; Outdoor ageing; Building-integrated photovoltaics; Teknisk fysik; TECHNOLOGY Engineering physics; TEKNIKVETENSKAP Teknisk fysik;

    Sammanfattning : Solar electricity is a promising energy technology for the future, and by using reflectors for concentrating solar radiation onto photovoltaic cells, the cost per produced kWh can be significantly reduced. The optical efficiency of a concentrating system determines the fraction of the incident energy that is transferred to the cells and depends on the optical properties of the system components. LÄS MER

  5. 5. A ten-year development of accessibility in the outdoor environment : Municipal challenges and older people’s perception

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Berglind Hallgrimsdottir; [2016-05-09]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Accessibility; intervention; Environmental Barriers; implementation; Ageing; Planners view;

    Sammanfattning : In an inaccessible outdoor environment, older people and people with disabilities can experience environmental barriers. The environmental barriers can restrict them and their abilities to walk. Environmental barriers can be avoided by designing the outdoor environment to meet the needs of older people and people with disabilities. LÄS MER