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  • 1
    Electronic Resource
    Electronic Resource
    Properties of sputtered superconducting films of Bi2Sr2CaCu2Ox made by low-temperature in situ growth (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 2135-2137 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting films of Bi2Sr2CaCu2Ox have been fabricated on single-crystal MgO substrates by a low-temperature in situ process. Using a substrate temperature Ts≈645 °C, metallic films with a superconducting onset of 90–100 K and an extrapolated Tc0=56 K have been obtained. X-ray diffraction shows the films to be c-axis oriented. Electron microscopy reveals that the films are not significantly smoother than films which were post-annealed at 865 °C, and that some segregation into nonsuperconducting phases had occurred. The exact mechanism by which crystallization and superconductivity occurs at such low temperatures is not yet known, but it can be speculated that the surface atoms are less constrained and thus have a smaller energy barrier to overcome in forming a crystal structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102347
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  • 2
    Electronic Resource
    Electronic Resource
    In situ measurement of ion-beam-induced deposition of gold (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 3636-3643 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experimental system for measuring ion-beam-induced deposition yield is described. Gold films were deposited on quartz-crystal microbalances (QCM) by decomposing dimethyl gold hexafluoroacetylacetonate molecules (C7H7F6O2Au) with a 5-keV argon-ion beam. The QCMs provide an in situ measurement of the deposition rate as a function of ion dose, dose rate, gas pressure, and substrate temperature. The deposition yield, or mass deposited per incident ion, is shown to increase with increasing pressure and decreasing temperature. The yield is independent of the ion dose rate, which implies that the deposition process is not due to macroscopic heating. The deposition yield is shown to depend on the sputter yield of the substrate. The density of the deposited films was determined to be about 10 g/cm3, which is about half the density of bulk gold (19.3 g/cm3). The difference in density is due to carbon contamination in the deposited films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342612
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  • 3
    Electronic Resource
    Electronic Resource
    Ion cluster emission and deposition from liquid gold ion sources (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 2724-2730 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The emission and deposition of molten gold droplets from needle-tip liquid metal ion sources was investigated. The Taylor cone was identified as the source of droplet emission. An upper limit of 8 μm for the virtual source size was measured. Gold films were deposited on silicon substrates. The deposited gold spots showed a peaked, axially symmetric, distribution with a half angle for droplet emission of ∼2° which was considerably smaller than the ion emission angle of ∼45°. Typical deposition fluxes were ∼5×105 μm3/s/sr with total deposition rates of ∼3×103 μm3/s and on an average droplet diameter of ∼1 μm at an emission current of 150 μA. Smaller diameter droplets are produced with decreasing emission current and angle. Gold films with a fine textured morphology suitable for submicron patterning were obtained at emission currents less than ∼135 μA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336300
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  • 4
    Electronic Resource
    Electronic Resource
    Enzyme-catalyzed organic syntheses: transesterification reactions of chlorophyll a, bacteriochlorophyll a, and derivatives with chlorophyllase (1988)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 110 (1988), S. 5888-5891 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00225a047
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  • 5
    Electronic Resource
    Electronic Resource
    The role of gas adsorption in ion-beam-induced deposition of gold (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 870-874 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Gold films were deposited on quartz crystal microbalances (QCM) by decomposing C7H7F6O2Au [dimethyl gold hexafluoroacetylacetonate, or DMG(hfac)] with a 5-keV argon-ion beam. A model for ion-beam-induced deposition is presented which relates the net deposition yield to the gas adsorption, the decomposition cross section, and the sputtering yield. The deposition rate was measured in situ as a function of ion current, gas pressure, and substrate temperature using the QCM. The deposition yield (mass deposited per incident ion) increased with increasing gas pressure and decreasing substrate temperature. The QCM was also used to measure the adsorption of DMG(hfac). The results demonstrated that the variation in deposition yield with temperature and pressure was proportional to the number of DMG(hfac) molecules adsorbed per cm2. Based on the observed correlation between deposition yield and adsorption, a decomposition cross section for 5-keV argon ions of 2×10−13 cm2 was estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343512
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  • 6
    Electronic Resource
    Electronic Resource
    Distribution of metals in annual rings of the beech (Fagus sylvatica) as an expression of environmental changes (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 537-542 
    Details
    ISSN: 1420-9071
    Keywords: Annual ring ; beech ; trace metals ; environmental pollution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Annual rings of 140–160-year-old beeches (Fagus sylvatica) from St. Ingbert, Saarland (FRG) were prepared and analyzed for 14 metals by atomic absorption spectroscopy. According to the chronological variations of their concentrations, the elements could be divided into three groups: 1) Metals without any tendency for chronological changes. This was established for Na, K, Cu, Cr, Co, Ni, Pb, and Cd. 2) Metals with a recent decrease of their concentrations, appropriate for Ca, Mg, Mn, and Zn. 3) Metals with a recent tendency to increase, e.g. Fe and Al. These variations are discussed in connection with the industrial history of the Saarland region and the influence of acid immissions which may alter the soil and thereby the trace element metabolism of the trees with consequences for the vitality of the plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946693
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  • 7
    Electronic Resource
    Electronic Resource
    On an infinite class of Steiner systems constructed from affine spaces (1986)
    Springer
    Archiv der Mathematik 47 (1986), S. 376-378 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01191366
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  • 8
    Electronic Resource
    Electronic Resource
    Über den diagnostischen Wert der eiweissgebundenen Hexosen (1960)
    Springer
    Journal of molecular medicine 38 (1960), S. 1187-1193 
    Details
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Es wird über die Veränderung der eiweißgebundenen Hexosen bei 485 Patienten mit den verschiedensten Erkrankungen berichtet und der diagnostische Wert der Eiweißzuckerbestimmung geprüft. Durch wiederholte Untersuchungen des Serumeiweißzuckergehaltes kann man sich an Hand der Veränderungen ein gutes Bild über den Krankheitsverlauf machen. In den meisten Fällen geht die Aussagefähigkeit aber nicht über die des Elektrophoresediagramms bzw. der BKS oder anderer Laboruntersuchungen hinaus. Die Bestimmung der eiweißgebundenen Hexosen ist aber dann wertvoll, wenn infolge eines Grundleidens (z. B. Leberparenchymschaden) das Elektrophoresediagramm in bestimmter Weise verändert, die BKS erhöht ist, so daß deren diagnostischer Wert beim Hinzutreten eines entzündlichen Prozesses o. ä. eingeschränkt ist. Durch wiederholte Bestimmungen der eiweißgebundenen Hexosen vermag man in solchen Fällen den Verlauf der komplizierenden Erkrankung besser zu überwachen als mit den anderen Labormethoden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01491150
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  • 9
    Electronic Resource
    Electronic Resource
    On collineation groups of projective spaces. I (1961)
    Springer
    Mathematische Zeitschrift 76 (1961), S. 411-426 
    Details
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01210987
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  • 10
    Electronic Resource
    Electronic Resource
    Some characterizations of finite projective spaces (1960)
    Springer
    Archiv der Mathematik 11 (1960), S. 465-469 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01236976
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