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  • 1
    Electronic Resource
    Electronic Resource
    Self-focusing of electromagnetic waves in a degenerate electron-hole plasma (1974)
    Springer
    Applied physics 3 (1974), S. 141-148 
    Details
    ISSN: 1432-0630
    Keywords: Self-focusing of e.m. waves ; Nonlinear media ; Electron-hole plasma
    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 free carrier nonlinear dielectric constant of a degenerate electron-hole plasma (e.g., Ge) in the presence of a Gaussian electromagnetic beam has been studied by a kinetic treatment. The redistribution of carriers (electrons and holes) is the source of nonlinearity and is effective in causing the self-focusing of the beam. The rise in carrier temperature due to the wave field is almost unaffected by the degeneracy, whereas the nonlinearity is considerably affected by it. The increase of degeneracy (by increasing the equilibrium carrier concentration at the fixed lattice temperature) increases the nonlinear dielectric constant. Hence self-focusing is enhanced by degeneracy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00884412
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Minimal growth conservation of potato microplants: silver thiosulfate reduces ethylene-induced growth abnormalities during prolonged storage in vitro (1999)
    Springer
    Plant cell reports 18 (1999), S. 897-903 
    Details
    ISSN: 1432-203X
    Keywords: Key words Ethylene inhibition ; Germplasm conservation ; In vitro conservation ; Minimal growth ; Potato ; Silver thiosulfate ; Solanum tuberosum L. ; Tissue culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Efficacy of silver thiosulfate (STS) in reducing ethylene-induced culture abnormalities during minimal growth conservation of microplants was studied in seven potato (Solanum tuberosum L.) genotypes. Different concentrations of STS (0, 1.5, 3.0, 4.5, 6.0, 7.5 and 9.0 μg ml–1) were tested in minimal growth medium based on MS medium supplemented with 20 g l–1 mannitol and 40 g l–1 sucrose. STS improved the microplant growth and reduced the culture abnormalities during prolonged maintenance of potato shoot cultures in vitro. The beneficial effect of STS was most prominent for number of green leaves per microplant and leaf senescence. After 16 months of storage, desirable microplant growth was observed in cultures conserved in medium containing 6.0–9.0 μg ml–1 STS. The profile of the peroxidase isozymes of conserved cultures did not show any apparent genetic variation due to the presence of STS in the conservation medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050681
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Amplification in Ni-like Nb at 204.2 Å pumped by a table-top laser (1993)
    Springer
    Applied physics 57 (1993), S. 303-307 
    Details
    ISSN: 1432-0649
    Keywords: 32.30.Rj ; 42.55.Vc ; 42.60.Lh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We identified for the first time the 3d 94d 1 S − 3d 94p 1 P line in Ni-like Nb at 204.2 Å that was predicted to show gain. When pumped with a train of pulses containing less than 1 J per pulse, significant emission was recorded at 204.2 Å following the second and the third pulses. We measured the small signal gain coefficient per Joule of incident laser energy to be 1.49±0.42 cm−1 J−1 for this laser transition, which is higher by several orders of magnitude than that reported for other collisional laser systems in this wavelength range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332453
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    Paper (German National Licenses)
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