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  • 1985-1989  (3)
  • 1980-1984
  • 1989  (3)
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  • 1985-1989  (3)
  • 1980-1984
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Resonance theory in atom-surface scattering (1989)
    Springer
    Communications in mathematical physics 126 (1989), S. 263-290 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We study the problem of analytic extension of the resolvent for Hamiltonians arising in scattering of atoms by a quantum surface. We prove that the resolvent extends holomorphically to some regions of the lower half plane with isolated singularities called Landau resonances which are branch points of the resolvent. We study also the effect of impurities on the singularities of the resolvent and show that the presence of impurities adds poles to the Landau resonances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02125126
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Breit-Wigner formulas for the scattering phase and the total scattering cross-section in the semi-classical limit (1989)
    Springer
    Communications in mathematical physics 121 (1989), S. 323-336 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract In this paper we prove results in resonance scattering for the Schrödinger operatorP v=−h 2Δ+V, V being a smooth, short range potential onR n . More precisely, for energy λ near a trapping energy level λ0 for the classical system defined by the Hamiltonianp(x,ζ)=ζ 2+V(x), we prove that the scattering phase and the scattering cross sections associated to (P v, P0) have the Breit-Wigner form (“Lorentzian line shape”) in the limith→0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01217809
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Micropropagation of floribunda, ground cover and miniature roses (1989)
    Springer
    Plant cell, tissue and organ culture 19 (1989), S. 55-64 
    Details
    ISSN: 1573-5044
    Keywords: rose ; meristem culture ; micropropagation ; root production ; long-term cultures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cultures were initiated from meristems (0.5 mm) of the rose cultivar Queen Elizabeth (floribunda) and from both shoot-tips and nodal explants (3–5 mm) of cultivars Sunburst Red, Toy Clown (miniatures) and Fiona (ground cover). Average proliferations of 5.0, 3.1, 1.3 and 2.5 shoots were obtained per culture cycle respectively on Murashige & Skoog (MS) medium with BA (1.0 mg l-1), NAA (0.1 mg l-1) and GA3 (0.1 mg l-1). With cv. Fiona, the proliferation rate was more than doubled by removal of the shoot apex. The rate of proliferation of cv. Queen Elizabeth was significantly increased by using long shoots (〉2 cm in length) and by re-culturing shoots to fresh medium every 3 weeks. In vitro rooting percentage with cv. Queen Elizabeth was enhanced by using long shoots (〉2 cm) and by dilution of MS medium to 1/4 strength. Transfer of shoots for direct rooting in compost was significantly improved by pre-culturing shoots for two weeks in vitro in media containing IAA, and by the use of sorbarods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037776
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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