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  • 61.70  (2)
  • corona discharges  (2)
  • Beta vulgaris  (1)
  • Springer  (5)
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  • Springer  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Disclosure of defects in YAG crystals by the thermoluminescence method (1984)
    Springer
    Applied physics 35 (1984), S. 249-253 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 61.80 ; 71.35 ; 78.55
    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 topograms revealing the anisotropic distribution of defects in the volume of monocrystalline YAG samples have been obtained by the thermoluminescence (TL) technique. It has also been shown that the anisotropic distribution of the lattice defects affects strongly the shape of the TL curves. The greatest changes in the TL intensity were observed in the areas of the samples distributed symmetrically every 120°. It was noted that the selective distribution of the TL intensity is caused mainly by the presence of the (211) facets as well as growth striations formed during the growth process. The groups of lines observed in the TL spectrum have been ascribed to the Tb3+ ions, excited owing to the radiationless energy transfer from the bound exciton states (BES).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617175
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of polyamines on the development of sugar beet protoplasts (1997)
    Springer
    Biologia plantarum 39 (1997), S. 561-567 
    Details
    ISSN: 1573-8264
    Keywords: Beta vulgaris ; plating efficiency ; protoplasts ; putrescine ; spermidine ; spermine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The influence of the exogenous polyamines: putrescine, spermidine and spermine, on the frequency of protoplast divisions for 2 genotypes of sugar beet (Beta vulgaris L.) was analyzed. Protoplasts were cultured by the agarose disk method on Saunders and Doley medium supplemented with either hormones or polyamines, or hormones combined with polyamines. The latter supplement led to a statistically significant increase in plating efficiency. The improvement in division index was caused mainly by spermine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000926714622
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  • 3
    Electronic Resource
    Electronic Resource
    Thermoluminescence of YAG:Nd crystals coloured with x-rays (1984)
    Springer
    Applied physics 34 (1984), S. 87-92 
    Details
    ISSN: 1432-0649
    Keywords: 61.70 ; 61.80 ; 71.35 ; 78.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The spectral distribution of the thermoluminescence (TL) of YAG:Nd crystals coloured by x-ray irradiation at room temperature (RT) and at 80 K has been investigated. The spectral distribution of TL in the uv-, visible and near ir ranges shows that the energy transfer by bound exciton states (BES) to the RE3+ ions (Nd3+ and Tb3+) decreases with increasing temperature. The TL spectrum in the uv range is ascribed to the hole defect centers. Diminution of the energy transferred by the BES to the Nd3+ and Tb3+ ions is the direct cause for the occurrence of the group of lines ascribed to the Nd3+ ions in TL observed at LT, whereas at RT and higher only the groups of Tb lines are observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697953
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  • 4
    Electronic Resource
    Electronic Resource
    Cleaning of Silicon and Steel Surfaces Using Dielectric Barrier Discharges (2000)
    Springer
    Plasmas and polymers 5 (2000), S. 91-102 
    Details
    ISSN: 1572-8978
    Keywords: dielectric barrier discharges ; corona discharges ; atmospheric pressure plasma ; plasma cleaning ; metal sheet ; degreasing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The plasma-activated removal of oil from contaminated silicon substrates and galvanized steel sheets has been performed using dielectric barrier discharges (DBD) at atmospheric pressure. Removal rates were determined by ellipsometric measurement of the oil film thickness, using polished silicon as substrates. With galvanized steel sheets, qualitative and quantitative investigations were done using fluorescence microscopic characterization of theplasma-treated surfaces. Both the ellipsometric and the fluorescence microscopic measurements yield the dependence of the removal rate on treatment parameterssuch as plasma–gas composition and gas flow. The film thickness measurements were calibrated using quantitative IR spectroscopic measurements. It could be shown that the removal rate increases with increasing oxygen content in the process gas, static removal rates of 0.6 nm/s and 7 nm/s being obtainedin pure nitrogen and in pure oxygen, respectively. Fluorescence microscopic investigations showed that oil can be removed even from grooves in the galvanized steel sheets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009535932312
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  • 5
    Electronic Resource
    Electronic Resource
    Surface Functionalization at Atmospheric Pressure by DBD-Based Pulsed Plasma Polymerization (2000)
    Springer
    Plasmas and polymers 5 (2000), S. 79-89 
    Details
    ISSN: 1572-8978
    Keywords: dielectric barrier discharges ; corona discharges ; atmospheric pressure plasma deposition ; plasma polymerization ; surface functionalization ; functional groups
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Dielectric barrier discharge (DBD)-based plasma deposition at atmospheric pressure, using glycidyl methacrylate (GMA, methacrylic acid-[2,3-epoxy-propyl ester]) as a prototype precursor was investigated in order to evaluate the applicability of dielectric barrier discharges to obtain plasma polymers with a high degree of structural retention of the starting precursor. Using pulsed excitation of the discharge, up to about 90% of the epoxy groups of GMA can be retained in plasma polymers obtainableat deposition rates in the order of 3–5nm/s. Preliminary investigations of the mechanism of film formation under pulsed plasma conditions indicate that the reaction of intact monomer molecules withsurface radicals generated during the pulses play a prominent role.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009583815474
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