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Visar resultat 6 - 10 av 21 avhandlingar som matchar ovanstående sökkriterier.

  1. 6. Analysis of Planar and Circular Cylindrical Multilayer Structures with Application to Soft and Hard Surfaces

    Författare :Zvonimir Sipus; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; antennas; periodic surfaces; integral equations; approximate boundary conditions; soft and hard surfaces; Green s functions; corrugated surfaces; moment method; periodic metal strips; multilayer structures; EFIE; microstrip antennas; spectral domain analysis; group representation theory; strip scatterers;

    Sammanfattning : This thesis deals with the analysis of planar and circular cylindrical multilayer structures, such as strip-loaded dielectric layers, corrugated surfaces and microstrip antennas. In particular, we study corrugations and strip-loaded grounded dielectric slabs when they are used to realize soft and hard surfaces. LÄS MER

  3. 7. Exploring psychotherapy group cultures : essays on group theory and the development of matrix representation grid, a method for observing therapeutic group processes

    Författare :Göran Ahlin; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : There is full agreement in the literature that group therapy groups are efficient but also may be occasionally damaging for participants due to vicissitudes in group dynamics and group process. Better understanding of the nature of therapeutic group processes presupposes advancements in group theory and in group process research. LÄS MER

  4. 8. Development of New Experimental Facilities at the Lund Nuclear Microprobe Laboratory

    Författare :Asad Shariff; Kärnfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; low energy tailing; sub-micron beam; PRAM; grid shadow; Kärnfysik; Nuclear physics; GUPIX; Ion Beam Analysis; PIXE; Fysicumarkivet A:2004:Shariff;

    Sammanfattning : Ion beam analysis techniques are now well established as research tools for a broad range of multidisciplinary scientific fields. The ability to focus an ion beam down to micrometer size has expanded and strengthened the capability of IBA techniques to a higher level. LÄS MER

  5. 9. Estimation and Classification of Non-Stationary Processes : Applications in Time-Frequency Analysis

    Författare :Johan Brynolfsson; Statistical Signal Processing Group; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Time-Frequency Estimation; Parameter Estimation; Reassignment method; Non-Stationary Processes; Smooth spectral estimation; Neural Networks;

    Sammanfattning : This thesis deals with estimation and classification problems of non-stationary processes in a few special cases.In paper A and paper D we make strong assumptions about the observed signal, where a specific model is assumed and the parameters of the model are estimated. LÄS MER

  7. 10. Electricity across borders : regional cost sharing of grid investments, international benchmarking and the electricity demand of an ageing population

    Författare :Hans Nylund; Andreas Stephan; Luleå tekniska universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Cost allocation; Game Theoy; Investments in Electricity grids; Efficiency benchmarking; Residential electricity demand; Economics; Nationalekonomi;

    Sammanfattning : This thesis deals with issues related to investments and regulation of high-voltage electricity grids, and to the households’ demand for electricity. The thesis consists of four self-contained papers. Papers I and II address the challenge of reaching agreements on the expansions of electricity grid infrastructure across national borders. LÄS MER