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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
    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
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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