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  • 1990-1994  (4)
  • 1994  (4)
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  • 1990-1994  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Inorganic chemistry 33 (1994), S. 3852-3854 
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0649
    Keywords: 42.55.Vc ; 32.30.Rj ; 52.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We point out that existing Ne-like X-ray lasers have sufficient brightness to be used as pump sources in resonant pump-fluorescence experiments, and we discuss some of the potential benefits and limitations of such experiments. In preliminary experiments, we have measured the line overlap of the Ne-like yttrium X-ray laser near 155 Å with 4f−3d transitions in H-like Na and He-like Mg. These experiments used a high-resolution grating spectrometer, and calibrated the wavelength of the yttrium laser by comparison against lines of known wavelength. The results indicate that the wavelength of the yttrium laser is 154.985 ± 0.025 Å, a factor of 2–4 improvement in precision over previous calibrations. We find that the yttrium laser is ≈ 100 mÅ to the long-wavelength side of both the He-like Mg line and the H-like Na line, so that neither resonance is perfect; however, Stark broadening could improve the overlap in the latter scheme, and bulk Doppler shifting could improve both resonances. We also find a good resonance between the yttrium laser and an un-identified transition which we tentatively attribute to copper.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0649
    Keywords: 31.30.Gs ; 32.70.Jz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Neon-like niobium X-ray lasers have been studied using both slab and thin-foil target geometries. Niobium foils of various lengths were irradiated from both sides with two beams of the frequency-doubled Nova laser system using a line focus. We looked for gain by measuring spectrally integrated line intensities at different plasma lengths. Gain was observed in four neon-like niobium lines corresponding to 3s−3p transitions. The line profile of theJ = 0−1 line (λ = 145.9 Å) shows splitting due to the hyperfine effect. Improved contrast in the hyperfine structure is observed as the plasma length is increased. Hyperfine splitting may be relevant to other 3s−3p transitions in neon-like niobium as well as other neon-like X-ray laser systems.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of orofacial orthopedics 55 (1994), S. 152-156 
    ISSN: 1615-6714
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In this article the embryology, morphology, pathophysiology, and treatment of the cleft malformation of the hard, the soft palate, and the vomer are described. A therapy is suggested, which minimizes the risk that these children are suffering from an impaired development of speech. Therefore, it is necessary; 1. to recognize the full extent of the malformation, 2. to close the cleft before the development of hearing and speech is finished as these 2 abilites are fundamental milestones of a normal psychosocial development. 3. Nearly normal anatomical and functional structures are to be achieved with the surgical treatment. Therefore the construction of 2 nasal floors, the correct adaption of the vomer to the palatal plates; and the intravelar veloplasty with the preparation of the aponeurosis are most important determinants. This treatment can avoid secondary operations to improve the results of hearing and speech.
    Notes: Zusammenfassung In dem Artikel werden Embryologie, Morphologie, Pathophysiologie und Behandlung der Segel-, Gaumen- und Vomerfehlbildung beschrieben. Eine Therapie wird vorgeschlagen, mit der die pathologische Sprachentwicklungsstörung der betroffenen Kinder vermieden werden kann. Dafür ist es notwendig, die Fehlbildung in ihrer Gesamtheit zu erkennen und nahezu normale morphologische Strukturen zu schaffen, und zwar vor Abschluß der für die psychosoziale Entwicklung der Kinder so wichtigen Hör-und Sprachentwicklung. Die Herstellung zweier getrennter Nasenhaupthöhlen einschließlich der Choanen, die anatomisch korrekte Anbindung des Vomers an die Gaumenplatten und die intravelare Muskelplastik mit Entfaltung der Aponeurose bis zum zwölften Lebensmonat sind Kernpunkte des operativen Vorgehens. Somit können sekundär sprachverbessernde, rehabilitierende Maßnahmen vermieden werden.
    Type of Medium: Electronic Resource
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