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Visar resultat 1 - 5 av 11 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Configuration study of large wind parks

    Författare :Stefan Lundberg; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; production cost; PCC; power quality; offshore; HVDC; wind parks; DC DC converters; control; losses; configurations; flicker; energy capture;

    Sammanfattning : In this thesis, layouts of various large-scale wind parks, using both AC as well as DC, are investigated. Loss modelling of the wind park components as well as calculations of the energy capture of the turbines using various electrical systems are performed, and the energy production cost of the various park configurations is determined. LÄS MER

  3. 2. Facilities Management and Health Care at Home

    Författare :Stefan Lundberg; Tore J. Larsson; Per Christiansson; KTH; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; facilities management; elderly; cognitive impairment; Technology and social change; Teknik och social förändring;

    Sammanfattning : The topic of this thesis is the new requirements that will be put upon the facilities management when the elderly are living longer in their own homes, in spite of illness, impairment and old age. For many reasons, especially demographic ones, this issue has come to the fore and since it has substantial political impact and considerably affects our living conditions, it will most certainly appear on the agenda of most Swedish housing companies in the near future. LÄS MER

  4. 3. Wind Farm Configuration and Energy Efficiency Studies - Series DC versus AC Layouts

    Författare :Stefan Lundberg; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : In this thesis, the design and control of a wind farm utilizing series-connected wind turbines with a DC output has been evaluated. The advantage is that a suitable DC voltage level, appropriate for transmission of the generated power directly, without using a large centralized DC/DC converter, can be obtained. LÄS MER

  5. 4. Effect Oriented Planning in Military Mission Support Systems : Models and Heuristic Approaches

    Författare :Kristian Lundberg; Kaj Holmberg; Torbjörn Larsson; Stefan Engevall; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Today there are many aspects of model based planning, probably much more than for just 20 years ago. Today data is not the problem, data is everywhere, but the big issue is to understand how to gain advantage of data in decision making - a growing focus is now on modeling!This work is devoted to this task and can be seen as a three part study. LÄS MER

  7. 5. Blood on the tracks : Life-course perspectives on health inequalities in later life

    Författare :Stefan Fors; Olle Lundberg; Carin Lennartsson; Kirsten Avlund; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Sweden; life-course; health; socioeconomic; childhood; Social work; Socialt arbete; Social Work; socialt arbete;

    Sammanfattning : The overall aim of the thesis was to explore social inequalities in: a) mortality during mid-life, b) health in later life, and c) old-age mortality, from a life-course perspective. The studies are based on longitudinal Swedish survey and registry data. LÄS MER