Sökning: "filler level"

Visar resultat 1 - 5 av 19 avhandlingar innehållade orden filler level.

  1. 1. Silicone Rubber Insulators: Impacts of Material Formulation in Coastal Environment

    Författare :Tomas G Gustavsson; Chalmers University of Technology; []
    Nyckelord :surface characterization; aging; filler level; outdoor insulation; leakage current measurements; material formulation; silicone rubber; polymeric insulators; coastal environment; polydimethylsiloxane PDMS ;

    Sammanfattning : This thesis deals with influences of material formulation on the performance of silicone rubber high voltage insulators in a coastal environment. Samples and insulators with known differences in material compositions have been used in this task. In the first step, a screening test with cylindrical samples was initiated. LÄS MER

  2. 2. Outdoor aging of silicone rubber formulations in coastal environment

    Författare :Tomas G Gustavsson; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; material forulation; coastal environment; polydimethylsiloxane PDMS ; filler level; outdoor insulation; aging; silicone rubber; polymeric insulators; surface characterization; leakage current measurements;

    Sammanfattning : .... LÄS MER

  3. 3. Chloride transport and chloride thresholdvalues-Studies on concretes and mortars with Portland cement and limestone blended cement

    Författare :Dimitrios Boubitsas; Avdelningen för Byggnadsmaterial; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Concrete; cement; limestone filler; chloride ingress; chloride threshold values;

    Sammanfattning : Reinforced concrete is one of the most widely used building materials and if it is properly designed and produced, it is an extremely durable material with a service life up to 100 years. However, under certain environmental conditions the service life of reinforced concrete structures is more limited. LÄS MER

  4. 4. Variables affecting stress development and resin conversion in light-cured dental composites

    Författare :Nazanin Emami; Luleå tekniska universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; Machine Elements; Maskinelement; Polymeric Composite Materials; Polymera konstruktionsmaterial;

    Sammanfattning : The general aim of this dissertation was to identify and investigate factors that can be used to minimize stress development in light cured dental resins without compromising the conversion level of the polymer. Modulus of elasticity, polymerization contraction strain, degree of conversion and shrinkage of light-cure dental composites were determined after curing with three different light power densities where total irradiated energy (J/cm2) kept constant. LÄS MER

  5. 5. Dielectric properties of poly(ethyelene-co-butyl acrylate) filled with Alumina nanoparticles

    Författare :Nadejda Jäverberg; Hans Edin; Eva Mårtensson; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nanocomposites; poly ethylene-co-butyl acrylate ; EBA; alumina; dielectric permittivity; absorbed water; humidity; temperature; dielectric spectroscopy; partial discharge; electrical treeing; Electrical engineering; Elektroteknik;

    Sammanfattning : In this work dielectric properties of the poly(ethylene-co-butyl acrylate)filled with alumina nanoparticles are evaluated. These nanocomposite materialswere manufactured at the department of Fibre and Polymer Technology,KTH.This study is limited to the properties of general importance for the AC applications. LÄS MER