Sökning: "Mathematical arguments"

Visar resultat 11 - 15 av 29 avhandlingar innehållade orden Mathematical arguments.

  1. 11. Short Term Operation of District Heating Systems: An Application of Mathematical Programming

    Författare :Hans Eriksson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This work treats the introduction of rigorous optimisation methods as a decision aid in the short term operation of district heating systems. The conditions for operation of district heating systems are investigated. Arguments for the necessity of a systems model that is capable of handling the discrete nature of the problem are presented. LÄS MER

  3. 12. Ramism, Rhetoric and Reform : An Intellectual Biography of Johan Skytte (1577–1645)

    Författare :Jenny Ingemarsdotter; Magnus Nyman; Hanna Östholm; Erland Sellberg; Uppsala universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Johan Skytte; history of education; Ramism; Petrus Ramus; utility; merit; humanism; Late Renaissance; Sweden; Age of Greatness; patriotism; Hesse-Kassel; the University of Marburg; Uppsala University; Charles IX; Gustav II Adolf; Vasa; Neo-Latin; dissertation; oration; rhetoric; reform; the mathematical arts; eloquence; History of science and ideas; Idé- o lärdomshistoria; History of Sciences and Ideas; Idé- och lärdomshistoria;

    Sammanfattning : This thesis is an intellectual biography of the Swedish statesman Johan Skytte (1577–1645), focusing on his educational ideals and his contributions to educational reform in the early Swedish Age of Greatness. Although born a commoner, Skytte rose to be one of the most powerful men in Sweden in the first half of the seventeenth century, serving three generations of regents. LÄS MER

  4. 13. Weighted Bergman kernels and biharmonic Green functions

    Författare :Stefan Jakobsson; Matematikcentrum; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; singularity resolution of Bergman kernels; Hadamard s variational formula; weighted Bergman kernel; weighted biharmonic Green function; Friedrichs operator; Plant biochemistry; Växtbiokemi;

    Sammanfattning : The main theme of this thesis is the connection between weighted biharmonic Green functions and weighted Bergman kernels. In the first paper, which is a joint work with H. Hedenmalm and S. Shimorin, we prove that weighted biharmonic Green functions are positive for weights which satisfy a mean-value condition and whose logarithms are subharmonic. LÄS MER

  5. 14. Variational Methods in Combinatorial Optimization and Phylogeny Reconstruction

    Författare :Henrik Jönsson; Beräkningsbiologi och biologisk fysik - Genomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; statistical physics; gravitation; relativity; annealing; variational; mean-field; phylogeny; constraint satisfaction; combinatorial optimization; maximum likelihood; Physics; Fysik; Mathematical and general theoretical physics; quantum mechanics; classical mechanics; klassisk mekanik; kvantmekanik; relativitet; statistisk fysik; termodynamik; Fysicumarkivet A:2001:Jönsson; Matematisk och allmän teoretisk fysik; thermodynamics;

    Sammanfattning : Algorithms based on the variational approach, as used in statistical physics, are developed. For constraint satisfaction problems a novel cost function, based on information-theoretic arguments, is introduced, and an algorithm similar to the mean-field annealing algorithm is proposed. LÄS MER

  7. 15. Model Vertices Beyond the GW Approximation

    Författare :Mikael Hindgren; Matematisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Matematisk och allmän teoretisk fysik; thermodynamics; statistical physics; gravitation; GW approximation; Electron self energy; Green s function; consistency; local-field corrections; vertex function; conserving approximations; variational energies; Mathematical and general theoretical physics; classical mechanics; relativity; quantum mechanics; klassisk mekanik; kvantmekanik; relativitet; statistisk fysik; termodynamik; Fysicumarkivet A:1997:Hindgren;

    Sammanfattning : We study the effects of local vertex corrections to the self energy of the electron gas. We find that a vertex derived from time-dependent density-functional theory can give accurate self energies without including the explicit time dependence of the exchange-correlation potential provided, however, that a proper decay at large momentum transfer (large q) is built into the vertex function. LÄS MER