Sökning: "Ageing"

Visar resultat 26 - 30 av 614 avhandlingar innehållade ordet Ageing.

1. 26. Ageing behavior of plastics used in automotive fuel systems

   Författare :Xin-Feng Wei; Mikael S. Hedenqvist; Richard Olsson; Ulf W Gedde; Pieter Gijsman; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Automotive; Ageing; Polyamide; Diesel; Biodiesel; Diffusion; Oxidation; Plasticizer migration; Mechanical properties; Fracture behavior.; Fordon; Åldrande; Polyamid; Diesel; Biodiesel; Diffusion; Oxidation; Mjukgöraravgång; Mekaniska egenskaper; Brottegenskaper;

   Sammanfattning : The increase in service temperature and the use of biobased fuels, such as biodiesel, have raised concerns on the short/long-term performance of plastic components used in automotive fuel systems.In this work the ageing behavior of unreinforced and glass-fibre reinforced polyamide 12 (PA12), exposed to three different fuels (petroleum diesel, biodiesel, and a mixture of these (80/20)) at high temperature, was investigated. LÄS MER

3. 27. The art of ageing well : a salutogenic perspective on physical activity for older adults

   Författare :Helena Ericson; Susanna Geidne; Mikael Quennerstedt; Inger Eliasson; Örebro universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Health resources; exercise; salutogenesis; sport and physical activity; ageing well;

   Sammanfattning : This thesis examines older adults’ participation in physical activity, and is framed within a salutogenic theory regarding ageing well, or as others say, healthy ageing. Ageing well can be studied in numerous ways. Since this thesis is within the field of Sport Sciences, different physical activity initiatives for older adults are in focus. LÄS MER

4. 28. Åldrandet och språket : en språkhistorisk analys av hög ålder och åldrande i Sverige cirka 1875–1975

   Författare :Anna Rosengren; David Gaunt; Historia; []
   Nyckelord :HUMANIORA; HUMANITIES; Ageing; cultural ageing; elderly; history of concepts; conceptual history; life-writing; auto biography; retirement; elderly care; welfare studies; Sweden; 19th century; 20th century.; Historical Studies;

   Sammanfattning : This thesis analyses how old age and ageing were manifested and understood in Sweden from approximately 1875 to 1975. It thus aims to provide historical background to current debate about for instance the retirement age and how to best care for the elderly. LÄS MER

5. 29. Volumetric Analysis in Mechanical Behaviour and Physical Ageing of Polymers

   Författare :Mats Delin; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ageing rate; Gr neisen parameter; bulk modulus; KAHR model; dilatometry; Poisson s ratio; timescale; physical ageing; dynamic mechanical properties; stress relaxation; volume changes; creep; Doolittle s equation;

   Sammanfattning : Volumetric changes associated with the deformation of ideal elastic solids depends on elastic constants of the solid and applied strain. Their magnitude is easily determined from the corresponding Poisson's ratios. LÄS MER

7. 30. Experimental investigations of ageing of commercial BEV Li-ion batteries

   Författare :Kristian Bartholdsson Frenander; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; silicon oxide; lithium plating; ageing; Physics-based modelling; Electric Vehicles; Lithium Ion Batteries; lifetime; NCA; State of Charge;

   Sammanfattning : The rapid development of lithium-ion batteries has enabled changes in widespread applications ranging from portable electronics to electric vehicles and large scale grid energy storage. However, battery ageing remain a challenge in all these applications, and this thesis seeks to contribute to the understanding of Li-ion battery degradation. LÄS MER