Sökning: "symmetry breaking"

Visar resultat 1 - 5 av 40 avhandlingar innehållade orden symmetry breaking.

  1. 1. Symmetry Breaking Ordering Constraints

    Detta är en avhandling från Uppsala : Data- och systemvetenskap

    Författare :Zeynep Kiziltan; Uppsala universitet.; [2004]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Datavetenskap; Constraint satisfaction; constraint programming; modelling; symmetry breaking; global constraints; Datavetenskap; TECHNOLOGY Information technology Computer science; TEKNIKVETENSKAP Informationsteknik Datavetenskap;

    Sammanfattning : Many problems in business, industry, and academia can be modelled as constraint programs consisting of matrices of decision variables. Such “matrix models” often have symmetry. In particular, they often have row and column symmetry as the rows and columns can freely be permuted without affecting the satisfiability of assignments. LÄS MER

  2. 2. Breaking the symmetry : spin splitting of hole subbands in strained quantum wells

    Detta är en avhandling från Fysiska institutionen

    Författare :Oskar Mauritz; KTH.; [1997]
    Nyckelord :;

    Sammanfattning : Properties of the subband structure and related propertiesof quantum wells (QWs) are investigated, within the frameworkof the multi-band envelope function method. The subbands of aQW are replaced by discrete Landau levels when a magnetic fieldis applied perpendicular to the plane of the well. LÄS MER

  3. 3. Modeling mesoscopic unconventional superconductors

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :Patric Holmvall; [2017]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; phase transitions; Andreev bound states; quasiclassical theory; mesoscopic thin-films; spontaneous symmetry breaking; time-reversal symmetry; Unconventional superconductivity; translational symmetry;

    Sammanfattning : High-temperature superconducting materials are often experimentally realized as thin films that can be patterned into devices operating in the mesoscopic regime. On this length scale, various finite-size and surface effects heavily influence the nature of the superconducting state, and can induce new ground states with spontaneously broken symmetries. LÄS MER

  4. 4. Mathematical modelling approach to collective decision-making

    Detta är en avhandling från Uppsala : Department of Mathematics

    Författare :Natalia Zabzina; Uppsala universitet.; [2017]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; collective behaviour; collective decision-making; communication mechanisms; positive feedback; mathematical modelling; bifurcation phenomena; steady state solutions; symmetry breaking; symmetry restoring; diffusion-limited aggregation; fractal dimension;

    Sammanfattning : In everyday situations individuals make decisions. For example, a tourist usually chooses a crowded or recommended restaurant to have dinner. Perhaps it is an individual decision, but the observed pattern of decision-making is a collective phenomenon. LÄS MER

  5. 5. Mirror Nuclei - Isospin Symmetry Breaking in the Mass A=35 and A=51 Mirror Nuclei

    Detta är en avhandling från Jörgen Ekman, Department of Physics, Box 118, SE-22100 Lund, Sweden

    Författare :Jörgen Ekman; Lunds universitet.; Lund University.; [2004]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; high-spin states; shell-model calculations; fusion-evaporation reactions; Nuclear physics; Kärnfysik; Fysicumarkivet A:2004:Ekman; isospin symmetry; Mirror nuclei;

    Sammanfattning : Popular Abstract in Swedish Atomkärnan består av protoner och neutroner, gemensamt kallade nukleoner, vilka hålls samman via den starka kärnkraften. Denna är emellertid inte den enda aktiva kraften i atomkärnan, utan även Coulomb växelverkan mellan de positivt elektriskt laddade protonerna är närvarande. LÄS MER