Sökning: "scale functions"

Visar resultat 21 - 25 av 500 avhandlingar innehållade orden scale functions.

1. 21. Homogenization of Some Selected Elliptic and Parabolic Problems Employing Suitable Generalized Modes of Two-Scale Convergence

   Författare :Jens Persson; Anders Holmbom; Liselott Flodén; Marianne Lindberg; Mårten Gulliksson; Peter Wall; Mittuniversitetet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; H-convergence; G-convergence; homogenization; multiscale analysis; two-scale convergence; multiscale convergence; elliptic partial differential equations; parabolic partial differential equations; monotone operators; heterogeneous media; non-periodic media; Mathematical analysis; Analys;

   Sammanfattning : The present thesis is devoted to the homogenization of certain elliptic and parabolic partial differential equations by means of appropriate generalizations of the notion of two-scale convergence. Since homogenization is defined in terms of H-convergence, we desire to find the H-limits of sequences of periodic monotone parabolic operators with two spatial scales and an arbitrary number of temporal scales and the H-limits of sequences of two-dimensional possibly non-periodic linear elliptic operators by utilizing the theories for evolution-multiscale convergence and λ-scale convergence, respectively, which are generalizations of the classical two-scale convergence mode and custom-made to treat homogenization problems of the prescribed kinds. LÄS MER

3. 22. Kan man räkna med PISA och TIMSS? : Relevansen hos internationella storskaliga mätningar i matematik i en nationell kontext

   Författare :Samuel Sollerman; Astrid Pettersson; Lovisa Sumpter; Christian Lundahl; Stockholms universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; International large-scale assessment; Mathematics; Validity; Validation; Relevance; Assessment; PISA; TIMSS; Mathematics education; matematikämnets didaktik; Mathematics Education;

   Sammanfattning : The overall purpose of the thesis is to contribute to the knowledge of relevance of international large-scale assessments (ILSAs) in mathematics, when these are to be used and interpreted in a national context. If a nation is to engage in ILSAs, draw conclusions from them and act on them, one should be aware of what they are measuring and how well it fits in with the national mathematics education and the mathematics they are trying to teach their students. LÄS MER

4. 23. Optimization, scale up and simulation of tumbling mills

   Författare :Ming-Wei Gao; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mineralteknik; Mineral Processing;

   Sammanfattning : Grinding is a fundamental process in the mineral industries. Grinding mills are often very large machines. Their efficiency and energy consumption therefore are of major importance. Problems of large ball mills are discussed in this thesis. LÄS MER

5. 24. Calculation of molecular wave-functions by large-scale non-empirical methods with applications to chemical problems

   Författare :Per Siegbahn; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : .... LÄS MER

7. 25. On large-scale neural simulations and applications in neuroinformatics

   Författare :Simon Benjaminsson; Anders Lansner; Marc-Oliver Gewaltig; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : This thesis consists of three parts related to the in silico study of the brain: technologies for large-scale neural simulations, neural algorithms and models and applications in large-scale data analysis in neuroinformatics. All parts rely on the use of supercomputers. LÄS MER