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  • Articles: DFG German National Licenses  (32)
  • 1995-1999  (6)
  • 1970-1974  (12)
  • 1965-1969  (14)
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  • Articles: DFG German National Licenses  (32)
Material
Years
Year
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  • 1
    Electronic Resource
    Electronic Resource
    On Green–Cusson Ansätze and deformed supersymmetric quantum mechanics (1996)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 37 (1996), S. 5297-5309 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Supersymmetric quantum mechanics cannot be deformed when the superposition of only a pair of usual bosons and fermions is considered, but it can if nontrivial parabosons and parafermions of the same order p of paraquantization are superposed. We take the simplest case p=2 and exhibit reducibility problems in that context by using Green–Cusson Ansätze following Macfarlane methods. Specific representations of the Lie superalgebra osp (2|2, R) play an interesting role in connection with possible deformations. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.531743
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On supersymmetry and radial equations for three-dimensional central problems (1995)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 36 (1995), S. 641-647 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Supersymmetric three-dimensional Schrödinger equations describing central problems do not lead, in general, to supersymmetric one-dimensional radial equations. Such a context is discussed, in connection with the two main supersymmetrization procedures (with or without spin-orbit coupling terms). The inverse problem is also considered, starting from a supersymmetric radial equation. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.531146
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Solar Spicules (1972)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 10 (1972), S. 73-100 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.10.090172.000445
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    SOME THEORETICAL AND PRACTICAL ASPECTS OF ISOTACHOPHORETICAL ANALYSIS (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 209 (1973), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1973.tb47546.x
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  • 5
    Electronic Resource
    Electronic Resource
    Phase gratings in the visible and near-infrared spectral range realized by metastable electronic states in Na2[Fe(CN)5NO] · 2H2O (1996)
    Springer
    Applied physics 63 (1996), S. 243-248 
    Details
    ISSN: 1432-0649
    Keywords: 42.40.Pa ; 42.70.Gi ; 42.70.Ln
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Phase and amplitude gratings in the visible and near-infrared spectral range can be written in SodiumNitro-Prusside (SNP), Na2[Fe(CN)5NO] · 2H2O, single crystals by optical excitation of infinitely long-living metastable electronic states, localized in the [Fe(CN)5NO]2− anions. Hence, its photorefractive effect does not depend on dopants or defects. The refractive index is modulated by more thanΔn = 1 × 10−3 in the red (632.8 nm) andΔn = 5 × 10−4 in the near-infrared region (1047 nm). The absorption coefficient is modulated by aboutΔα = 100 m−1 at 632.8 nm and 40 m−1 at 1047 nm. The wavelength dependence ofΔn can be explained by strong absorption bands in the ultraviolet considering Kramers-Kronig dispersive analysis. The time constant of the write-read-erase processes and the diffraction efficiencyη depend on light intensity, wavelength and polarization of the light with respect to the crystallographic axes. After excitation of the metastable states the indicatrix is modulated only along thea- andb-axis of the orthorhombic system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01833793
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Phase gratings in the visible and near-infrared spectral range realized by metastable electronic states in $\rm Na_2[Fe(CN)_5NO] \cdot 2H_2O$ (1996)
    Springer
    Applied physics 63 (1996), S. 243-248 
    Details
    ISSN: 1432-0649
    Keywords: PACS:42.40.Pa; 42.70.Gi; 42.70.Ln
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Phase and amplitude gratings in the visible and near-infrared spectral range can be written in SodiumNitroPrusside (SNP), $\rm Na_2[Fe(CN)_5NO] \cdot 2H_2O$ , single crystals by optical excitation of infinitely long-living metastable electronic states, localized in the $\rm [Fe(CN)_5NO]^{2-}$ anions. Hence, its photorefractive effect does not depend on dopants or defects. The refractive index is modulated by more than $\Delta n = 1 \times 10^{-3}$ in the red $(632.8$ nm) and $\Delta n = 5 \times 10^{-4}$ in the near-infrared region $(1047$ nm). The absorption coefficient is modulated by about $\Delta \alpha = 100$ m $^{-1}$ at $632.8$ nm and 40 m $^{-1}$ at 1047 nm. The wavelength dependence of $\Delta n$ can be explained by strong absorption bands in the ultraviolet considering Kramers-Kronig dispersive analysis. The time constant of the write-read-erase processes and the diffraction efficiency $\eta$ depend on light intensity, wavelength and polarization of the light with respect to the crystallographic axes. After excitation of the metastable states the indicatrix is modulated only along the $a$ - and $b$ -axis of the orthorhombic system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01833793
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    The He+ λ 4686 line in the low chromosphere (1973)
    Springer
    Solar physics 28 (1973), S. 27-34 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report an unsuccessful search for the He+ λ 4686 line in the low chromosphere. However, at the location of this line we detect a number of other chromospheric emission lines. This leads us to the conclusion that the He+ λ 4686 identification made in the past, as well as other identifications, are probably in error. Additionally the region of the neutral helium λ4713 line is also studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152908
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  • 8
    Electronic Resource
    Electronic Resource
    The intensity, velocity and magnetic structure of a sunspot region (1968)
    Springer
    Solar physics 4 (1968), S. 142-164 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The observational set-up for a detailed study of the velocity, intensity and magnetic-field fine structure in and around a sunspot is described. On highly resolved spectra we detected in the vicinity of a sunspot a large number of points with strong magnetic fields (magnetic knots). The magnetic field in these knots causes a striking decrease of the line depth (or a ‘line gap’ after Sheeley, 1967). The properties of the magnetic knots are: (1) magnetic fields up to 1400 gauss; (2) diameter ≈ 1100 km; (3) coincidence with dark intergranular spaces; (4) generally downward material motion; (5) lifetime〉30min; (6) estimated total number around an unipolar spot ⩾ 2000; (7) combined magnetic flux comparable to the sunspot flux; (8) coincidence with Ca+ plages. For the smallest sunspots (pores) we obtained magnetic fields 〉1500 gauss. Hence a magnetic field of about 1400–1500 gauss appears to be a rather critical level for pore and spot formation. We found a large number of small areas producing line gaps without measurable magnetic field. These ‘non-magnetic gap-regions’ coincide with bright continuum structures. Some aspects arising from the occurrence of hundreds of magnetic knots in an active region are discussed in the last section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148076
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    The interpretation of velocity filtergrams (1969)
    Springer
    Solar physics 9 (1969), S. 35-38 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper describes a numerical experiment in which the effect of an assumed velocity distribution in the solar atmosphere on the intensity difference between a blue- and a red-wing filter-gram is derived. This results in the effective optical depth at which the velocity is measured. It is shown that this τeff strongly depends on the assumed velocity distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145725
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  • 10
    Electronic Resource
    Electronic Resource
    The polarization of coronal emission lines (1971)
    Springer
    Solar physics 21 (1971), S. 439-447 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By means of a photographic polarimeter, we attempted to measure both the amount and direction of linear polarization of all emission lines between 3400 and 9000 Å in the inner corona (1.034 ≤ r/r 0 ≤ 1.085). Only the green and red coronal lines have been analyzed in detail. Neither of these lines shows polarization exceeding the probable error of 1.0% for λ 5303 and 1.8% for λ 6374. None of the other 17 coronal lines observed during the 7 March, 1970 solar eclipse show any obvious (〉5%) polarization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154296
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