Search for dissertations about: "life-time"

Showing result 1 - 5 of 170 swedish dissertations containing the word life-time.

  2. 1. Mechanisms of Electrical Ageing of Oilimpregnated Paper due to Partial Discharges

    Author : Mohamad Ghaffarian Niasar; Hans Edin; Ernst Gockenback; KTH; []
    Keywords : 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;

    Abstract : 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. READ MORE

  4. 2. High Performance Fiber Lasers with Spectral, Thermal and Life Time Control

    Author : Pär Jelger; Fredrik Laurell; Johan Nilsson; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Optical physics; Optisk fysik;

    Abstract : This thesis contains the results of research in the fields of spectral control, efficiency andlifetime of high-power, rare-earth doped fiber lasers, properties which are of greatimportance for scientific and industrial applications. Volume Bragg gratings (VBGs) has forthe first time been used together with fiber lasers and the laser performance in terms ofspectral purity, thermal stability, and tunability was evaluated. READ MORE

  5. 3. On stone indentations in district heating pipes : pipe and backfill interactions and life time aspects

    Author : Stefan Forsaeus Nilsson; RISE; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : .... READ MORE

  6. 4. Long-term Performance of PVC and CSPE Cables used in Nuclear Power Plants : the Effect of Degradation and Plasticizer migration

    Author : Maria Ekelund; Ulf Gedde; Thomas Hjertberg; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; PCV; CSPE; cables; ageing; mechanical properties; plasticizer migratio; LIRA; life time prediction; Chemistry; Kemi;

    Abstract : Enormous amounts of low voltage cables installed in a Swedish nuclear power plant are reaching their expected lifetimes. Since the cables are crucial to operational safety, it is of great importance that the actual condition of the installed cables is determined. READ MORE

  7. 5. Top-down Fabrication Technologies for High Quality III-V Nanostructures

    Author : Shagufta Naureen; Srinivasan Anand; Clivia M. Sotomayor Torres; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; III-V nanostructures; colloidal lithography; top-down fabrication; dry etching; quantum well; multilayer structures; nanowires; nanopillars; nanodisks; mono-layer etching; surface passivation; photoluminescence; carrier life time; total reflectivity; photonic crystals; nanomesh;

    Abstract : III-V nanostructures have attracted substantial research effort due to their interesting physical properties and their applications in new generation of ultrafast and high efficiency nanoscale electronic and photonic components. The advances in nanofabrication methods including growth/synthesis have opened up new possibilities of realizing one dimensional (1D) nanostructures as building blocks of future nanoscale devices. READ MORE