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Visar resultat 1 - 5 av 170 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Assessment of the Long-Term Transport Processes and Chemical Evolution in Waste Deposits

    Författare :Sami Bozkurt; KTH; []
    Nyckelord :Solid waste; landfill processes; transport processes; long-term; heavy metals; contaminant release; oxygen; modelling; conceptual model; pH buffering; redox buffering; final top cover; natural analogue;

    Sammanfattning : .... LÄS MER

  2. 2. From novice towards self-care expert : studies of self-care among persons using advanced medical technology at home

    Författare :Angelika Fex; Olle Söderhamn; Anna-Christina Ek; Britt-Marie Ternestedt; Högskolan Väst; []
    Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Home care services; Self care; Technology; medical; Dependent-care; Health; Hermeneutics; Home dialysis; Home ventilator; Long-term oxygen; Next of kin; Phenomenology; Transition; Egenvård; Medicinsk teknik; Nursing; Omvårdnad; Vårdvetenskap; Nursing science; health; hermeneutics; home dialysis; home ventilator; long-term oxygen; next of kin; phenomenology; transition; MEDICINE; MEDICIN;

    Sammanfattning : The use of advanced medical technology at home has increased in most industrialized countries. The overall aim of this thesis was to develop knowledge of self-care and transition and issues that influence daily life and health among persons using advanced medical technology at home. LÄS MER

  3. 3. Predicting the Long-Term Insulation Performance of District Heating Pipes

    Författare :Camilla Persson; Chalmers University of Technology; []
    Nyckelord :heat conduction; polyurethane foam; insulation capacity; diffusion; thermal conductivity; cyclopentane; solubility coefficient; long-term performance;

    Sammanfattning : The aim of the studies that comprise this thesis was to predict the heat loss over timefrom a range of district heating pipes insulated with closed-cells foam. The thermalconductivity of the foam changes over time when it is not diffusion-tight encapsulatedagainst the environment, as diffusion alters the cell gas composition until it reachesequilibrium with the surrounding air. LÄS MER

  4. 4. Long-term properties of polyethylene films : efficiency of a natural antioxidant

    Författare :Clara Strandberg; Ann-Christine Albertsson; Jukka Seppälä; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Polymer Technology; alfa-tocopherol; Polyethylene PE ; Thermal aging; Infrared Spectroscopy FT-IR ; Chemiluminescence CL ; Solid-phase microextraction SPME ; Chemistry; Kemi;

    Sammanfattning : There is a growing awareness of the risks of pollution in biological systems and one potential problem is the synthetic antioxidants, used for e.g. the stabilisation of polymeric materials. Natural antioxidants are an interesting alternative, if the high efficiency and thermal stability of the synthetic compounds can be reached. LÄS MER

  5. 5. Degradation mechanisms and long-term performance of PUR insulation in district heating pipes

    Författare :Alberto Vega; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; mechanical performance; thermal conductivity; District heating pipe; degradation mechanisms; long-term performance; rigid polyurethane foam;

    Sammanfattning : District heating networks are used worldwide, especially in Scandinavian countries and also in many other countries, e.g. Germany, Russia, United States, South Korea and China. From an environmental point of view, district heating networks are a good alternative to more traditional building heating systems. LÄS MER