Sökning: "sum rules"

Visar resultat 1 - 5 av 39 avhandlingar innehållade orden sum rules.

  1. 1. Störande elever korrigerande lärare : Om regler, förväntningar och lärares åtgärder mot störande flickor och pojkar i klassrummet

    Författare :Marcus Samuelsson; Kjell Granström; Gunilla Jedeskog; Mats Ekholm; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; rules; expectations; misbehaviours; corrections; gender; leadership; regler; förväntningar; störande beteende; korrigeringar; kön; ledarskap; Education; Pedagogik;

    Sammanfattning : The aim of this study is to investigate rules and teachers´ expectations that are described by teachers and documents, what sort of pupils´ disorder that teachers put their attention to, in what way teachers´ are correcting pupils´ misbehaviours as well as how female and male teachers are correcting boys and girls. The study is based on a so called Yo-yo fieldwork in three schools. LÄS MER

  3. 2. Integral Identities for Passive Systems and Spherical Waves in Scattering and Antenna Problems

    Författare :Anders Bernland; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dispersion relations; sum rules; physical limitations; Herglotz functions; electromagnetic scattering; antenna theory; spherical wave expansions; antenna measurements; propagation channel measurements;

    Sammanfattning : Sum rules and physical limitations within electromagnetic theory and antenna theory have received significant attention in the last few years. However, the derivations are often relying on application specific and sometimes unsupported assumptions, and therefore a mathematically rigorous and generally applicable approach seems timely. LÄS MER

  4. 3. Estimation of electromagnetic material properties with application to high-voltage power cables

    Författare :Yevhen Ivanenko; Sven Nordebo; Martin Norgren; Linnéuniversitetet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material losses; power cables; cylindrical multipole expansion; Herglotz functions; convex optimization; sum rules; Waves and Signals; Vågor och signaler;

    Sammanfattning : Efficient design of high-voltage power cables is important to achieve an economical delivery of electric power from wind farms and power plants over the very long distances as well as the overseas electric power. The main focus of this thesis is the investigation of electromagnetic losses in components of high-voltage power cables. LÄS MER

  5. 4. Dispersion Relations in Scattering and Antenna Problems

    Författare :Christian Sohl; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; acoustic and electromagnetic waves; sum rules; scattering and absorption; causality; Herglotz functions;

    Sammanfattning : This dissertation deals with physical bounds on scattering and absorption of acoustic and electromagnetic waves. A general dispersion relation or sum rule for the extinction cross section of such waves is derived from the holomorphic properties of the scattering amplitude in the forward direction. LÄS MER

  7. 5. A method for calculating finite crossing sum rules for partial waves of helicity amplitudes

    Författare :David Johnson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER