Sökning: "Ageing mechanisms"

Visar resultat 1 - 5 av 106 avhandlingar innehållade orden Ageing mechanisms.

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. Investigating ageing mechanisms in electric vehicle batteries : A multiscale approach to material analysis

   Författare :Anastasiia Mikheenkova; Maria Hahlin; Matthew Lacey; Cesar Pay Gómez; Sandrine Lyonnard; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Li-ion batteries; Ni-rich cathode; Ageing mechanisms; Batteries for electric vehicles; X-ray diffraction; NCA; NMC811; Kemi med inriktning mot materialkemi; Chemistry with specialization in Materials Chemistry;

   Sammanfattning : Electrifying passenger transport is a key strategy in combating global warming, with Li-ion batteries (LIBs) being the current go-to technology. Despite LIB’s satisfactory performance and carbon-neutral operation, lifetime and safety are still public concerns. LÄS MER

4. 3. Anti-Ageing Strategies : How to avoid failure in sodium-ion batteries

   Författare :Le Anh Ma; Reza Younesi; Daniel Brandell; Laurent Duda; Philipp Adelhelm; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; sodium-ion batteries; manganese-based cathodes; solid electrolyte interphase; ageing mechanism; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

   Sammanfattning : In order to move away from fossil fuels, batteries are one of the most important technologies to store energy from renewable sources. The rapid demands of battery applications put pressure on supply chains of raw materials, such as lithium, nickel, copper, aluminium and cobalt. LÄS MER

5. 4. Mechanisms of Electrical Ageing of Oilimpregnated Paper due to Partial Discharges

   Författare :Mohamad Ghaffarian Niasar; Hans Edin; Ernst Gockenback; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; partial discharges; oil-impregnated paper; oil; transformer insulation; dielectric frequency response; breakdown strength; ion mobility; thermal ageing; electrical ageing; moisture in paper; life time; thermal breakdown.; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : In this thesis, partial discharge (PD) phenomenon in oil-impregnated paper (OIP) is investigated under accelerated electrical stress. The thesis is mainly focused on the characteristic of PD activity and the influence it has on the insulation properties of OIP. LÄS MER

7. 5. Living Longer, Living Harder : Ageing in Extreme Poverty in Bangladesh

   Författare :Owasim Akram; Thomas Denk; Jan Jämte; Ilaria Pitti; Johan Vamstad; Örebro universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Ageing; Agency; Extreme Poverty; Generational Bargain; Life History Interviews; Othering; Postcolonial; Qualitative; Social Policy; Welfare Regimes;

   Sammanfattning : The overall aim of this dissertation is to understand the lived experience of age-ing in extreme poverty in developing countries, in this case Bangladesh, a country that hosts a large number of extreme poor and ageing population. By focusing on the role of the family, the most neglected pillar of welfare, this dissertation sheds new light on the microprocesses of welfare politics. LÄS MER