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  • Electronic Resource  (3)
  • 1995-1999  (3)
  • 1970-1974
  • 1999  (3)
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  • Electronic Resource  (3)
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  • 1995-1999  (3)
  • 1970-1974
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  • 1
    Electronic Resource
    Electronic Resource
    Characteristics of Ba0.5Sr0.5TiO3 thin films grown by ultraviolet-assisted pulsed laser deposition (1999)
    Springer
    Applied physics 69 (1999), S. S787 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 84.32; 77.80; 81.15; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The microstructure and properties of barium strontium titanate (BST) thin films grown by an in situ ultraviolet-assisted (UV-assisted) pulsed laser deposition (UVPLD) technique are reported in this paper. In comparison with BST films grown by conventional pulsed laser deposition (PLD) under similar conditions, but without UV illumination, the UVPLD-grown films exhibited improved structural, electrical, and optical properties. X-ray photoelectron spectroscopy showed that when exposed to atmosphere, Ba atoms from the outermost layers formed a thin layer of barium carbonate, which negatively affects the film electrical characteristics. UVPLD-grown films exhibited a smaller amount of Ba atoms within the carbonate layer, resulting in better electrical characteristics. The dielectric constant of 40-nm-thick films deposited at 650 °C by UVPLD and PLD were determined to be 281 and 172, respectively. The leakage current density of the UVPLD-grown films was in the mid-10-8 A/cm2 range, a factor of 2 lower than that obtained from PLD-grown films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051530
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Flow in a porous medium induced by torsional oscillation of a disk near its surface (1999)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 50 (1999), S. 529-545 
    Details
    ISSN: 0044-2275
    Keywords: Key words. Porous medium, torsional oscillation of a disk.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract. Torsional oscillation of an infinite disk in a viscous liquid bounded by a porous medium fully saturated with the liquid has been discussed. It is assumed that the flow between the disk and the porous medium is governed by Navier-Stokes equation and that in the porous medium by Brinkman equation. Flows in the two regions are matched at the interface by assuming that the velocity and stress components are continuous at it. It is found that the depth of penetration of the flow in the porous medium is proportional to the square root of the permeability of the medium. The oscillation of the disk induces a steady radial-axial flow in both the regions in such a way that there is a steady axial flow of the fluid from the porous medium to the free flow region i.e. the fluid is expelled out from the porous medium. The steady flow in the porous medium increases with the increase of the permeability of the medium and with the decrease of the distance between the oscillating disk and porous surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000330050164
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Greening of Peas: Parallel Measurements of 77 K Emission Spectra, OJIP Chlorophyll a Fluorescence Transient, Period Four Oscillation of the Initial Fluorescence Level, Delayed Light Emission, and P700 (1999)
    Springer
    Photosynthetica 37 (1999), S. 365-392 
    Details
    ISSN: 1573-9058
    Keywords: intermittent irradiation ; photosystem 2 ; Pisum sativum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Irradiation of etiolated leaves leads to their greening. Although this problem has a long history, the question of whether the intermittent irradiation (IMI) grown plants have fully functional reaction centres as well as the oxygen clock, before exposure to continuous irradiation (CI), had not been resolved. To answer this question, as well as to analyze the development of the two photosystems, the following parallel measurements were made: (1) Emission spectra at 77 K; (2) OJIP chlorophyll (Chl) a fluorescence transient; (3) period 4 oscillation in the flash number dependence of initial fluorescence F0 (at 50 µs) and FJ (at 2 ms); and (4) P700. In the 1-ms-flash (FL) grown pea, that has a different biogenesis of the photosynthetic apparatus, delayed light emission (DLE) and Chl a fluorescence transient were measured in parallel. Quantitative analysis of Chl a fluorescence values provided the following conclusions: (1) IMI, not FL, plants have almost fully developed reaction centres and the oxygen clock. (2) Further greening of IMI plants under CI involves two phases: (a) during 3-4 h of CI, the number of PS2 units and connectivity between them increase, and then (b) light-harvesting antenna increases. (3) In FL, 10 min CI activates fully the oxygen clock.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007199408689
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    Paper (German National Licenses)
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