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  • 2000-2004  (2)
  • 1995-1999  (6)
  • 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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  • 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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Surgical treatment of aspergillus spondylodiscitis (2000)
    Springer
    European spine journal 9 (2000), S. 75-79 
    Details
    ISSN: 1432-0932
    Keywords: Key words Aspergillosis ; Spondylodiscitis ; Debridement ; Spinal fusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Four cases of aspergillus spondylodiscitis were treated with operative debridement and fusion. In this rarely encountered mycotic infection of the spine in immunocompromised patients rapid destruction of the intervertebral disc and vertebral bodies can occur. In advanced cases antimycotic drug therapy is thought to be ineffective and a forcing indication for surgery exists when the destruction is progressive and spinal cord compression is imminent or manifest. Spinal instrumentation can be of help in maintaining or restoring spinal stability and maintaining spinal alignment. ¶In our four patients the aspergillus spondylodiscitis was successfully eradicated and fusion achieved. In two of three patients with a neurologic deficit, this deficit disappeared. Two patients died within 6 months after the operative treatment, due to complications related to the underlying illness. One patient was left with a subtotal paraplegia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005860050014
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  • 5
    Electronic Resource
    Electronic Resource
    Long-term results of rib perichondrial grafts for repair of cartilage defects in the human knee (1997)
    Springer
    International orthopaedics 21 (1997), S. 313-317 
    Details
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé. Depuis septembre 1986 jusqu’à decembre 1992 quatre-vingt huit patients presentant les lésions cartilagineuses au genou ont été traité par arthroplastie périchondrale. Dans les lésions, une partie du périchondre de la côte a été fixé avec de la colle de fibrine. Les soins consécutifs consistaient à une immobilisation, une mobilisation passive, et a une mise en charge partielle puis complète. L’évaluation des résultats a été fait avec l’aide de la cotation Hospital for Special Surgery pour l’articulations du genou, par examen radiologique, arthroscopie postoperatoire et recueil de l’opinion subjective du patient. Les résultats après une étude moyenne de cinquante deux mois ont été bon à 38%, modéréà 8% et mauvais à 55%. Les contre-indications pour cette technique sont des forages ou nettoyages précédents, l’arthrose, l’âge avancé du patient, et des douleurs préexistantes. Des bons résultats sont vus dans les lésions isolées à 91% (30/33). Nous concluons que l’arthroplastie avec périchondre peut être favorable pour réparer des lésions cartilagineuses. Cette technique peut diminuer les douleurs des patients bien sélectionnés et prévenir les opérations plus compliquées pour arthrose.
    Notes: Summary. Eighty-eight patients with articular cartilage defects in the knee were treated by perichondrial arthroplasty between 1986 and 1992. An autogenous strip of costal perichondrium was fixed in place with fibrin glue, followed by immobilisation, continuous passive motion, and partial weightbearing. The results were evaluated using the Hospital for Special Surgery Score for knee function, radiographs, arthroscopy and the patient’s subjective opinion. The results after a mean follow-up of 52 months were good in 38%, fair in 8% and poor in 55%. Previous drilling or shaving of a defect, concomitant osteoarthritis, older age and a long history of complaints proved to be contraindications. Good results were seen in 91% of isolated defects. Perichondrial arthroplasty can be beneficial in the repair of cartilage defects. It will reduce symptoms in carefully selected cases, and avoid more extensive operations for osteoarthritis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002640050175
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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 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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  • 7
    Electronic Resource
    Electronic Resource
    Oscillator-Like Hamiltonians and Squeezing (2000)
    Springer
    International journal of theoretical physics 39 (2000), S. 1515-1527 
    Details
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Generalizing a recent proposal leading to one-parameter families of Hamiltoniansand to new sets of squeezed states, we construct larger classes of physicallyadmissible Hamiltonians permitting new developments in squeezing. We alsodiscuss coherence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003684011477
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  • 8
    Electronic Resource
    Electronic Resource
    Using eclipse observations to test scintillation models (1995)
    Springer
    Solar physics 156 (1995), S. 1-5 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Near second and third contact during a solar eclipse the spatial spectrum of the solar illumination changes as the relative power at high spatial frequencies increases strongly. Since groundlevel atmospheric scintillation depends on a weighted integral of the image power spectrum, we can expect to see a measureable time dependence to solar scintillation during an eclipse. This effect was observed during an annular solar eclipse and quantitatively compared with a scintillation model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00669570
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