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  • 1
    Digitale Medien
    Digitale Medien
    Non-linear Spin Waves on Topological Defects of Texture in Superfluid 3He-B (1998)
    Springer
    Journal of low temperature physics 110 (1998), S. 51-56 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have observed non-linear behaviour of stationary spin waves localised on textural topological defects. We can explain our results in the framework of the Schrödinger equation with feedback. The new method gives us the ability to see many topological defects, which are undistinguished by traditional methods of NMR. We have found that some of the non-linear spin wave modes can be responsible for the extremely long lived induction decay signals called ”Persistent signals”.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1022554415394
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  • 2
    Digitale Medien
    Digitale Medien
    Non-linear Stationary Spin-waves in Superfluid 3He-B at Ultra-low Temperatures (1998)
    Springer
    Journal of low temperature physics 113 (1998), S. 693-698 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have performed detailed CW NMR measurements on superfluid 3 He-B in order to investigate stationary spin-wave modes in a texture well. Our results at high temperatures are consistent with previous work. However, we find that the spin dynamics is profoundly modified, even for small excitation amplitudes, for temperatures on the order of 200 μK, substantially lower than the limit reached in previous investigations. We report the observation of non-linear spin-waves at ultra-low temperatures and their characterization in terms of a third-order anharmonic oscillator.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1022501411081
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  • 3
    Digitale Medien
    Digitale Medien
    On the acidic properties of H-SABO zeolites (1991)
    Springer
    Reaction kinetics and catalysis letters 43 (1991), S. 571-575 
    Details
    ISSN: 1588-2837
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Abstract Данные ТПДА, обработанные на ЭВМ, свидетельствуют об уменьшающейся силе центров Яронштэда и об ограничениях форсированной диффузии, вызванных встраиванием бора в позиции решетки цеолита пентазильного типа.
    Notizen: Abstract Computer handling of TPAD data reveals a decreasing strength of Brönsted sites and forced diffusion limitations caused by incorporation of boron at pentasil type zeolite lattice positions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02064730
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  • 4
    Digitale Medien
    Digitale Medien
    Quasicrystalline order in binary dipolar systems (2004)
    Springer
    The European physical journal 42 (2004), S. 85-94 
    Details
    ISSN: 1434-6036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. Motivated by recent experimental findings, we investigate the possible occurrence and characteristics of quasicrystalline order in two-dimensional mixtures of point dipoles with two sorts of dipole moments. Despite the fact that the dipolar interaction potential does not exhibit an intrinsic length scale and cannot be tuned a priori to support the formation of quasicrystalline order, we find that configurations with long-range quasicrystallinity yield minima in the potential energy surface of the many particle system. These configurations emanate from an ideal or perturbed ideal decoration of a binary tiling by steepest descent relaxation. Ground state energy calculations of alternative ordered states and parallel tempering Monte-Carlo simulations reveal that the quasicrystalline configurations do not correspond to a thermodynamically stable state. On the other hand, steepest descent relaxations and conventional Monte-Carlo simulations suggest that they are rather robust against fluctuations. Local quasicrystalline order in the disordered equilibrium states can be strong.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2004-00359-6
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