Sökning: "Ageing and technology"

Visar resultat 1 - 5 av 239 avhandlingar innehållade orden Ageing and technology.

  1. 1. Ageing of Asphalt Mixtures : Micro-scale and mixture morphology investigation

    Författare :Prabir Kumar Das; Björn Birgisson; Nicole Kringos; Andreas Loizos; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ageing; Aggregate packing; Atomic force microscopy; Asphalt mixture; Bitumen; Diffusion; Finite element analysis; Gradation; Micro-structure; Mixture morphology; Oxidative ageing; Surface ageing;

    Sammanfattning : There are many variables that affect the viscoelastic properties of asphalt mixtures with time, among which age hardening may be considered one of the important ones. Age hardening of asphalt mixtures is an irreversible process, which contributes to a reduction of the durability of pavements and eventually increases the maintenance cost. LÄS MER

  3. 2. A Socio-Material Study of User Involvement : Interrogating the practices of technology development for older people in a digitalised world

    Författare :Björn Fischer; Britt Östlund; Alexander Peine; Steve Woolgar; KTH; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; HUMANIORA; HUMANITIES; HUMANIORA; HUMANITIES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; User involvement; Older People; Participation; Socio-material Conditions; Enactment; Ontology; Configuring; Ageing and Technology; Ethnography; Method and Design Practice; Användarinvolvering; Äldre Människor; Delaktighet; Sociomateriella förhållanden; Enactment; Ontologi; Konfigurering; Åldrande och Teknik; Etnografi; Metod och Designpraktik; Technology and Health; Teknik och hälsa;

    Sammanfattning : Population ageing and increased digitalization each constitute an ongoing and profound transformation within contemporary modes of living, as growing advances in technological development mix and intermingle with the lived realities of older people as the final recipients. It is against the backdrop of this interplay that user involvement has enjoyed ever-rising advocacy to an almost normative degree. LÄS MER

  4. 3. Quantitative studies of changes in microstructure and activity during ageing of supported catalysts

    Författare :Torben Pingel; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; supported nanoparticle catalyst; scanning electron microscopy SEM ; quantitative; bimetallic catalyst; ageing properties; CO oxidation; FIB SEM; specimen preparation; particle size distribution PSD ; transmission electron microscopy TEM ;

    Sammanfattning : Catalytic converters have substantially contributed to the improvement of air quality in populated areas in the last decades by abatement of the emission of hazardous componentssuch as CO, unburned hydrocarbons and NOx. However, due to the exposure to high temperature and different components in the exhaust gas, the performance of the catalysts degrades with time. LÄS MER

  5. 4. Chemical ageing and thermal stability of polyethylene copolymers

    Författare :Karl Michael Jäger; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; electrical properties; agglomeration; polyethylene copolymers; carbon black; ageing; thermal degradation;

    Sammanfattning : .... LÄS MER

  7. 5. Functional Properties and Morphology of Recycled Post-consumer WEEE Thermoplastic Blends

    Författare :Erik Stenvall; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; morphology; melt-blending; compatibilisation; extrusion; SEBS; WEEE; physical ageing; TOF-SIMS; co-continuous; chemical degradation; plastics recycling;

    Sammanfattning : This work concerns a waste electrical and electronic equipment blend of recycled plastics (WEEEBR), reprocessed from a low density thermoplastics batch (600 kg) by removal of non-thermoplastic contamination (1.2 weight % (wt%)). LÄS MER