Sökning: "square lattice"

Visar resultat 1 - 5 av 31 avhandlingar innehållade orden square lattice.

  1. 1. Magnetic frustration and low-dimensional magnetism : in transition metal fluorophosphates and square-lattice intermetallic compounds

    Författare :Stefanie Siebeneichler; Anja-Verena Mudring; Ulrich Häussermann; Sven Lidin; Kenneth R. Poeppelmeier; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; magnetic frustration; low-dimensional magnetism; ionothermal synthesis; powder neutron diffraction; fluorophosphates; intermetallics; Physical Chemistry; fysikalisk kemi;

    Sammanfattning : Solids can display a variety of vastly different magnetic properties. Besides the generally well known ferromagnets, antiferromagnets with their antiparallel arrangements of magnetic moments can exhibit a wide range of complex magnetic behavior such as magnetic frustration or low-dimensional antiferromagnetism. LÄS MER

  3. 2. Three applications of graph-theoretic methods

    Författare :Dmitrii Zhelezov; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Product set; arithmetic progression; random orientations; percolation; square lattice; random group; commuting graph; diameter; arithmetic progression;

    Sammanfattning : .... LÄS MER

  4. 3. Modelling animal populations

    Författare :Åke Brännström; Umeå universitet; []
    Nyckelord :population model; stochastic population model; population dynamics; discrete time model; Beverton-Holt model; Skellam model; Hassell model; Ricker model; first principles; coupled map lattice; CML; area integral; square function; Mathematics; matematik;

    Sammanfattning : This thesis consists of four papers, three papers about modelling animal populations and one paper about an area integral estimate for solutions of partial differential equations on non-smooth domains. The papers are: I. Å. Brännström, Single species population models from first principles. LÄS MER

  5. 4. On the Growth and Properties of InAs/Ga1-xInxSb Superlattices and Related Materials

    Författare :Jöran H. Roslund; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; molecular-beam epitaxy; InAs Ga1-xInxSb superlattices; envelope-function calculations; lattice-mismatched semiconductors; Si-doping of Ga1-xInxSb; type-II superlattices;

    Sammanfattning : InAs/Ga1-xInxSb semiconductor superlattices and their constituent materials have been studied theoretically, grown by molecular-beam epitaxy and characterised by various techniques. InAs/Ga1-xInxSb superlattices are interesting for use in far-infrared detectors because of their narrow band gaps. LÄS MER

  7. 5. Mechanistic aspects of structure and dynamics in perovskite type oxyhydrides and alkali silanides

    Författare :Carin Österberg; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; inelastic neutron scattering; hydrogen dynamics; mean square displacement; quasielastic neutron scattering; localized motion; oxyhydride; energy materials;

    Sammanfattning : This Thesis concerns experimental studies of the two alkali silanides ASiH3 (A = K and Rb) and the recently discovered perovskite type oxyhydrides BaTiO3-xHx (x = 0.14 and 0.40). LÄS MER