Sökning: "moment map"

Visar resultat 1 - 5 av 16 avhandlingar innehållade orden moment map.

1. 1. Tensor Products of Highest Weight Representations and Skew-Symmetric Matrix Equations A+B+C=0

   Författare :Ida Säfström; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Highest weight respresentation; tensor product decomposition; orthogonal algebra; skew-symmetric matrix; Horn’s conjecture; moment map; coadjoint orbit; flag manifold; general linear algebra; infinite dimensional unitary representation; general linear algebra;

   Sammanfattning : The question of characterizing the eigenvalues for the sum of two Hermitian matrices, was solved in 1999, after almost a century of efforts. The saturation conjecture for GL_C(n) was proven by Knutson and Tao, filling in the last gap in Horn’s conjecture. LÄS MER

3. 2. Exercising Mathematical Competence: Practising Representation Theory and Representing Mathematical Practice

   Författare :Anna Ida Säfström; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Mathematical competence; exercising competencies; young children; whole number arithmetic; tertiary level; proving; highest weight representation; tensor product decomposition; skew-symmetric matrix; moment map; infinite dimensional unitary representation; highest weight representation;

   Sammanfattning : This thesis assembles two papers in mathematics and two papers in mathematics education. In the mathematics part, representation theory is practised. Two Clebsch-Gordan type problems are addressed. LÄS MER

4. 3. Spin momentum transfer effects for spintronic device applications

   Författare :Yan Zhou; Johan Åkerman; Daniel E. Bürgler; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Spin Torque Oscillator; Giant Magnetoresistance; Tunneling Magnetoresistance; Magnetism; Magnetism;

   Sammanfattning : The recent discovery that a spin-polarized current can exert a large torque on a ferromagnet, through direct transfer of spin angular momentum, offers the possibility of electrical current controlled manipulation of magnetic moment in nanoscale magnetic device structures. This so-called spin torque effect holds great promise for two applications, namely, spin torque oscillators (STOs) for wireless communication and radar communication, and spin transfer torque RAM (STT-RAM) for data/information storage. LÄS MER

5. 4. Döva barns begreppsbildning i matematik

   Författare :Elsa Foisack; Malmö högskola; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Cognitive education; Döva barn; Sign language; Mediated learning; Begreppsbildning; Teckenspråk; Matematikundervisning; Mathematics education; Dynamic assessment; Deaf children; Concept formation; Special didactics; concept map; sign language; mediated learning; Deaf; mathematics education; Specialdidaktik;

   Sammanfattning : Denna studie tar utgångspunkt i frågan varför många döva barn har svårt att lära sig matematik. Studiens syfte är att belysa döva barns begreppsbildning i ämnet matematik genom att beskriva hur några döva barn uttrycker sig och agerar på väg mot förståelse av två centrala matematiska begrepp, nämligen multiplikation med heltal och längd. LÄS MER

7. 5. Packaging methods and storage time : effects on beef quality

   Författare :Åsa Lagerstedt Norström; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

   Sammanfattning : Consumers base their purchasing choices on perceived quality and a bright red colour of beef is to many a sign of freshness and good meat quality, making colour the most important quality attribute for retailers. The most common consumer packaging types for beef in Sweden is high-oxygen modified atmosphere packaging (MAP), with the gas composition (80% O₂; 20% CO₂). LÄS MER