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  • 1
    Electronic Resource
    Electronic Resource
    Ultrathin-layer (AlAs) m (GaAs) m superlattices withm = 1,2,3 grown by molecular beam epitaxy (1987)
    Springer
    Applied physics 43 (1987), S. 75-79 
    Details
    ISSN: 1432-0630
    Keywords: 68.55 ; 78.65 ; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Ultrathin-layer (AlAs) m (GaAs) m superlattices withm = 1, 2, and 3 were grown by molecular beam epitaxy and characterized by x-ray diffraction and photoluminescence measurements. The appearance of distinct satellite peaks around the Bragg reflections demonstrate the formation of high-quality layered crystals. The observed luminescence shows a maximum at 2.033 eV form = 3, and the emission energy decreases form = 2 andm = 1 as well as for them = 4 superlattice. This result for the monolayer superlattice is in good agreement with recent theoretical calculations, and it shows that the (AlAs)1(GaAs)1 superlattice represents a new artificial semiconductor material with novel electronic properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615210
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Surgical treatment supposed natural history of the tethered cord with occult spinal dysraphism (1997)
    Springer
    Child's nervous system 13 (1997), S. 268-274 
    Details
    ISSN: 1433-0350
    Keywords: Key words Occult spinal dysraphism ; Tethered cord ; Lumbosacral lipoma ; Tight filum terminale ; Surgical treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We retrospectively evaluated the pre- and postoperative course of 34 tethered cord patients with occult spinal dysraphism in an attempt to infer the natural history of this disorder and to determine the effectiveness of the surgical treatment. There were 32 cases with lumbosacral lipoma and 2 with tight filum terminale. The age at surgery ranged from 1 month to 47 years old. Eight patients, aged 1 month to 4 years old, were asymptomatic; 26 had neurogenic bladder (26 cases) or motor problems affecting the legs (8 cases). None of the patients older than 5 years of age were asymptomatic. Untethering of the spinal cord was performed in all cases. The postoperative follow-up period ranged from 5 months to 11 years. During these periods, 7 (88%) of the 8 asymptomatic patients remained neurologically intact, 6 (23%) of the 26 symptomatic patients showed improved symptoms, and 15 patients (58%) remained unchanged. These results indicate that the neurological symptoms will appear progressively in the tethered cord patients, and that prophylactic surgery should be considered as early as possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003810050081
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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