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  • Electronic Resource  (3)
  • 1985-1989  (3)
  • 81.30Fb  (1)
  • Acute disseminated encephalomyelitis  (1)
  • Analysis  (1)
  • Autocorrelation  (1)
  • Performance  (1)
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Material
  • Electronic Resource  (3)
Years
  • 1985-1989  (3)
Year
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  • 1
    Electronic Resource
    Electronic Resource
    Transmission electron microscopy study of defects in Sn-doped GaAs films grown by molecular beam epitaxy (1987)
    Springer
    Applied physics 44 (1987), S. 143-151 
    Details
    ISSN: 1432-0630
    Keywords: 68.55Jh ; 81.30Fb ; 68.35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Films of GaAs, heavily doped with Sn, which have been grown by molecular-beam epitaxy are found to contain single-crystal Sn particles situated in the nearsurface region of the epilayer GaAs. The morphology and chemical composition of the particles have been examined by using cross-section transmission electron microscopy combined with energy-dispersive x-ray spectroscopy. Different growth conditions were used to study the Sn-particle formation and high-resolution transmission electron microscopy was used to investigate microstructures. The observations are discussed in terms of several models previously proposed for these phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626415
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cranial computed tomography in acute disseminated encephalomyelitis (1989)
    Springer
    Neuroradiology 31 (1989), S. 8-12 
    Details
    ISSN: 1432-1920
    Keywords: Acute disseminated encephalomyelitis ; cranial computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Acute disseminated encephalomyelitis (ADEM) is an uncommon inflammatory disorder of the nervous system. The appearance of ADEM on cranial CT scans has rarely been reported. The author reports seven cases in two instititions during a period of seven years. Only four of the seven patients had hypodense lesions in the white matter and six patients showed spotty, nodular, or gyral enhancement after contrast injections. The enhancement resolved with steroid therapy, leaving some persistent hypoattenuated areas even after 10 months follow-up, these findings support the dual components of the pathogenesis of ADEM. The vasculitic component may be responsive to steroids, nevertheless the demyelinating or necrotic areas may not, and the latter may be responsible for the sequelae of ADEM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342021
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Ventricular fibrillation detection by a regression test on the autocorrelation function (1987)
    Springer
    Medical & biological engineering & computing 25 (1987), S. 241-249 
    Details
    ISSN: 1741-0444
    Keywords: Analysis ; Autocorrelation ; Defibrillation ; Performance ; Regression ; Signal ; Ventricular fibrillation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The paper investigates quantitative differences in the signal characteristics of ventricular fibrillation (VF) and other cardiac arrhythmias. The analysis procedure comprises two steps: calculation of a short-term autocorrelation function (ACF) followed by a regression test on a plot of peak magnitudes of the ACF against lag values (the ACF/lag plot). We detect VF by testing the hypothesis that the ACF/lag plot of VF does not pass a linear regression test. Analysis of 31 separate episodes (of VF and other ventricular arrhythmias), each comprising three successive segments of 1·5s each produced the following results: (1) 100 per cent sensitivity (Se), 62 per cent specificity (Sp) and 74 per cent test efficiency (TE) after analysis of the first segment; (2) 100 per cent Se, 86 per cent Sp and 90 per cent TE after the second segment; and (3) 100 per cent Se, 100 per cent Sp and 100 per cent TE after the third segment. This method quantifies the notion that VF signals are nonperiodic with a random amplitude distribution, whereas ventricular tachycardia (VT) signals are usually periodic with more uniform amplitude distributions. Accurate discrimination and identification of VF can be very important in intensive-care settings, as well as in the design of automatic cardioverters and defibrillators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02447420
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    Paper (German National Licenses)
    Fulltext
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