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  • 1
    Electronic Resource
    Electronic Resource
    Regeneration of tepals, stamens and ovules in explants from perianth of Hyacinthus orientalis L. importance of explant age and exogenous hormones (1988)
    Springer
    Planta 175 (1988), S. 478-484 
    Details
    ISSN: 1432-2048
    Keywords: Flower organs (regeneration) ; Hyacinthus ; Ovule ; Stamen ; Tepal ; Tissue culture (flower organs)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Regeneration of tepals, stamens and ovules from perianth explants of Hyacinthus orientalis L. in different developmental stages could be controlled by means of exogenous hormones. Perianth explants in a relatively early stage of development were competent for differentiation of tepals on Murashige and Skoog (MS) medium supplemented with 2 mg·1-1 N6-benzylaminopurine (BAP) or zeatin and 0.1 mg·1-1 2,4-dichlorophenoxyacetic acid (2,4-D). Perianth explants in a later stage of development regenerated stamens and ovules, and marked difference was observed in the activity of BAP and zeatin in this regard. Zeatin stimulated more strongly stamen formation, while BAP enhanced ovule formation. Thus, stamens were formed when the explants were cultured for four months on medium with 2 mg·1-1 BAP and 0.1 mg·1-1 2,4-D and then transferred to medium with 0.2 mg·1-1 zeatin and 0.005 mg·1-1 1-naphthaleneacetic acid. On the other hand, differentiation of ovules occured in explants cultured for two weeks on the former medium and then transferred to medium with 0.1 mg·1-1 BAP and 0.01 mg·1-1 2,4-D. Although ovule formation could also be obtained with 2 mg·1-1 BAP alone, it was substantially enhanced by the presence of 0.1 mg·1-1 2,4-D in the medium in the early stages of culture. The results demonstrate the importance of both the developmental stage of the source organ from which explants are excised and of the hormone composition of the medium for the regeneration of different floral organs by perianth explants of Hyacinthus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393068
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructures and photoluminescence of hydrogenated amorphous carbon films produced by using organic hydrocarbon source (2000)
    Springer
    Applied physics 71 (2000), S. 651-655 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.05.Gc; 78.55.-m; 61.43.Dq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Thin layers of hydrogenated amorphous carbon were prepared by using organic hydrocarbon source, xylene (C8H10), in plasma-enhanced chemical vapor deposition (PECVD) system. The microstructures were characterized by using Fourier-transform infrared and Raman scattering spectra. The appearance of a sharp vibration signal in 1600 cm-1 strongly suggests the existence of sp2 carbon clusters with aromatic rings. With increasing the deposition rf power, the content of these aromatic structures is increased in the films. In contrast to a broad single PL peak in methane (CH4)-baseda-C:H films, the PL band of xylene-based a-C:H films contains multiple peaks in blue-green light region, which is influenced by rf power. We tentatively attributed it to the radiative recombination of electron-hole pairs through some luminescent centers associated with aromatic structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390000576
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  • 3
    Electronic Resource
    Electronic Resource
    Resonant laser ablation of copper and its application in microanalysis (1999)
    Springer
    Applied physics 69 (1999), S. S167 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 82.80.Ms; 32.80.-t; 79.20.Ds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Resonant laser ablation (RLA) is a two-step process, occurring within a pulse of a tunable laser, in which the leading edge of the laser pulse ablates a solid surface to produce neutral atoms or molecules that are then resonantly ionized by the trailing edge of the same laser pulse. The sensitivity and selectivity of RLA allow detection and quantitation at very low concentrations. In our preliminary RLA research, a sub-ppm detection level has been reached for copper in a standard aluminium sample. In addition, the threshold and saturation effects of RLA have been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003399900192
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  • 4
    Electronic Resource
    Electronic Resource
    Theoretical study on the organic molecular second-order hyperpolarizability (2000)
    Springer
    Applied physics 70 (2000), S. 601-605 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.50; 42.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The molecular second-order hyperpolarizabilities β of several series of substituted aromatic compounds have been calculated using the CNDO/S-CI method and perturbation theory. A systematical study was carried out and we found that there was a close relationship between the molecular structure and β. The β value usually increases with the strength of the substituents except for fluoro group. Chloro is amphiprotic in contributing to molecular nonlinearity. Of the donor groups Br, CH3, OCH3 and Cl are the best candidates according to S, which is defined as the criterion of choosing the groups in molecular designing for second-order nonlinear optical materials. The donor-acceptor para-disubstitution is the most effective comparing to the meta- or ortho-disubstitutions, and the contribution of the extending of conjugated system to β is dominant whereas that of the substitutions takes second place.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050868
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  • 5
    Electronic Resource
    Electronic Resource
    Modulated cyclotron resonance in multi-quantum well structure of In0.53Ga0.47As/InP induced by interband and exciton excitation (1994)
    Springer
    International journal of infrared and millimeter waves 15 (1994), S. 237-246 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report for the first time the modulated cyclotron resonance of electrons in the lattice-matched multi-quantum well structures of In0.53Ga0.47As/InP induced by monochromatic light beam of excitation. The resonant enhancement and modulation of the cyclotron resonance of electron due to interband and exciton excitation in the structures have been observed experimentally, which shows the possible prospect of the method for the observation of cyclotron resonances in semiconductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265887
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  • 6
    Electronic Resource
    Electronic Resource
    A Deductive Method for the Incomplete Far-Infrared Reflection Spectrum Analysis (1998)
    Springer
    International journal of infrared and millimeter waves 19 (1998), S. 1007-1015 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report a deductive method used in the incomplete far-infrared reflection spectrum analysis. The inherent restriction between the oscillator model and Kramers-Kronig relation is used to deduct the dielectric constant. In this way, one can analysis the incomplete far-infrared reflection spectrum of a crystal by combining both oscillator model and Kramers-Kronig relation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022683626584
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  • 7
    Electronic Resource
    Electronic Resource
    Chemical evolution of CO2 by electrocatalytic oxidation of vanadium-impregnated coke anode material (1986)
    Springer
    Journal of applied electrochemistry 16 (1986), S. 357-364 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Baked carbon containing impregnated vanadium may be electrochemically oxidized to CO2 in 1 M H2SO4 at 80–90% current efficiency during prolonged electrolysis (〉20 h) at 70°C under an applied potential of 1.0 V versus saturated calomel electrode (SCE). The vanadium is electrocatalytically maintained in the highest oxidation state with an activation energy of 44–80 kJ mol−1 at temperatures up to 80°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008845
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  • 8
    Electronic Resource
    Electronic Resource
    Flexural failure of unidirectional carbon/epoxy composites: Effects of interleaving and flexural rate (1998)
    Springer
    Journal of polymer research 5 (1998), S. 133-142 
    Details
    ISSN: 1572-8935
    Keywords: Continuous-fiber composites ; Three-point flexure ; Interleaving ; Rate effect ; Failure mode
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The effects of a low-modulus high-strain interleaf layer, introduced at the midplane, on unidirectional carbon/epoxy laminates under flexural loading were investigated. The apparent energy-to-fail of the laminates increased significantly whereas the maximum load decreased slightly upon interleaving. Real-time microscopic observations during static flexure tests at the lowest deflection rate indicated a dramatic change of failure mode from the dominantly compressive fracture of the baseline laminate to the dominantly tensile fracture process upon interleaving. Failure modes of interleaved and baseline laminates showed no significant changes with test rate in the deflection rate range of 10−6 to 100 m/sec.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0049-4
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  • 9
    Electronic Resource
    Electronic Resource
    Application of GaAs/GaAlAs multiple-quantum-well infrared detector array in the infrared imaging camera (1994)
    Springer
    International journal of infrared and millimeter waves 15 (1994), S. 137-144 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A long-wavelength (λ p =7.7μm) infrared imaging camera that uses a GaAs/GaAlAs multiple-quantum-well infrared photo-detector array is presented. A good infrared image of a group of buildings and trees is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265880
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  • 10
    Electronic Resource
    Electronic Resource
    Modification of Drude model on the free carrier property of IV-VI compound semiconductor in magnetic field (1994)
    Springer
    International journal of infrared and millimeter waves 15 (1994), S. 991-999 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A general analytical expression is reported for the Drude model's dielectric function of free carrier in multi-valley IV-VI compound semiconductor in the magnetic field. The modifications of the energy band non-parabolicity and free carrier re-population are introduced to the dielectric function in combination with the $$\vec k \cdot \vec P$$ model. The difference of the dielectric function between the modified Drude model and the classical Drude model is demonstrated by the calculation for the typical IV-VI compound semiconductor material PbTe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02096130
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