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  • 1985-1989  (6)
  • 1955-1959
  • 1986  (6)
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  • 1985-1989  (6)
  • 1955-1959
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    A new connection rule of wave functions at a heterointerface and band discontinuity between GaAs and AlGaAs (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 4087-4090 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new connection rule of wave functions at a heterointerface was developed. This connection rule satisfies the conservation of probability current and contains a nonparabolic effective mass of carriers as a natural consequence of the theory. The subband energies in a GaAs/AlGaAs quantum well calculated using our new connection rule are in excellent conformity with a wide range of experimental results with band discontinuity of 85% and an effective mass for hole of 0.34m0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336716
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optical properties of quantum wells with ultrathin-layer superlattice barriers (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 2503-2506 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single quantum wells of GaAs with barriers of (AlAs)2(GaAs)2 ultrathin-layer superlattices have been fabricated and photoluminescence measurement was performed. The photoluminescence energy was found to change almost linearly against the well width and the photoluminescence linewidth to get smaller with decreasing well width, which is in marked contrast to the case of a usual alloy-barriered single quantum well. It is indicated that the effective energy gap of the ultrathin-layer superlattice barrier decreases with the decreasing well width in such a structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336996
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    High electron mobility in the selectively doped heterostructures grown by normal pressure metalorganic chemical vapor deposition (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 334-337 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: GaAs/AlGaAs heterostructure selectively doped with Si was grown in a conventional normal pressure metalorganic chemical vapor deposition using trimethyl metals and arsine. Mobility of the two-dimensional electron gas as high as 8100, 148 000, and 401 000 cm2/V s was obtained at 300, 77, and 5 K, respectively, for a sample with an undoped Al0.3Ga0.7As spacer layer of 100 A(ring) and with a sheet electron density of about 5×1011 cm−2. The heterostructure with the spacer layer thinner than 100 A(ring) shows high mobility comparable to the best values obtained by molecular-beam epitaxy. The influence of growth parameters on the electron mobility in the heterostructure is described in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337648
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Preventive effects of Cyclosporin on diabetes in NOD mice (1986)
    Springer
    Diabetologia 29 (1986), S. 244-247 
    Details
    ISSN: 1432-0428
    Keywords: Cyclosporin ; NOD mice ; Type 1 diabetes ; insulitis ; autoimmunity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Non-obese diabetic mice aged 30 to 60 days were treated orally with Cyclosporin at doses of 25,15 and 2.5 mg/kg every 2 days until 160 days of age. Diabetes developed in 12 out of 18 oil-treated mice (67%), with partial to complete Langerhans' islet destruction associated with lymphocytic infiltration. The non-obese diabetic mice showed a plasma glucose concentration of 6.62 ± 0.92 mmol/l (mean ± SD) at 50 days of age. The plasma glucose level of oil-treated non-obese diabetic mice gradually increased after 130 days of age and reached 14.0 to 19.0 mmol/l at 160 days of age, while Cyclosporin-treated non-obese diabetic mice showed neither clear increase of plasma glucose levels nor development of insulitis. The cumulative incidence of diabetes in Cyclosporin-treated mice was significantly lower than that in oil-treated mice (p 〈 0.01). Subsequently, Cyclosporin treatment was started after development of glucose intolerance. Twenty-five mg/kg of Cyclosporin was administered every 2 days for 35 days. Cyclosporin appeared to have little therapeutic effect on diabetes in non-obese diabetic mice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454884
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Direct contact heat transfer to a drop translating in a transverse electric field (1986)
    Springer
    Heat and mass transfer 20 (1986), S. 11-18 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Es wurden Experimente über den Wärmeübergang an einem einzelnen Tropfen durchgeführt, der sich in einer mit ihm nicht mischbaren Flüssigkeit senkrecht zu einem elektrischen Feld bewegt. Besondere Aufmerksamkeit wurde der durch das elektrische Feld induzierten Zirkulation im Inneren des Tropfens gewidmet. Es wurden drei verschiedene Kombinationen von Flüssigkeiten getestet, nämlich eine, bei der der Faktor aus der Dielektrizitätskonstanten und dem spezifischen elektrischen Widerstand zwischen Tropfen und Medium groß gegenüber 1 ist, und zwei, für die dieser Faktor klein gegen 1 ist. Im ersten Fall wurde eine merkliche Verbesserung des Wärmeübergangs beobachtet, die man auf die induzierte Zirkulation zurückführen kann. Jedoch kann die Verbesserung, die sich bei den zwei letztgenannten Bedingungen einstellte, nicht durch die dort verschwindend geringen Zirkulationsströmungen erklärt werden, wenn sie auch weniger stark ausgeprägt war.
    Notes: Abstract An experimental study has been performed on heat transfer to a single drop translating in an immiscible liquid on which a steady uniform electric field is imposed perpendicular to the drop path. Particular attention has been paid to the effect of field-induced circulations inside and outside the drop. Three different combinations of liquids were tested: one for which the drop-to-medium permittivity ratio ɛ* multiplied by the drop-tomedium resistivity ratio χ* is large compared to unity and two for which ɛ* χ* ≪ 1. In the former a remarkable enhancement of heat transfer was obtained which could be ascribed to the induced circulations. However, a less remarkable enhancement obtained in the latter two could not be explained by the circulations which are predicted to be vanishingly weak.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00999731
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Spatio-temporal organization of intracellular ATP content and oscillation patterns in response to blue light byPhysarum polycephalum (1986)
    Springer
    Protoplasma 135 (1986), S. 31-37 
    Details
    ISSN: 1615-6102
    Keywords: Blue light ; Intracellular ATP ; Oscillation pattern ; Physarum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Phototactic responses in a giant amoeboid cell ofPhysarum plasmodium were studied both by analyzing intracellular ATP content and by applying image processing for recording oscillatory changes in thickness with use of a microcomputer. The ATP content fluctuated and deviated from the initial level upon exposure to light with varying wavelength from 400 to 600 nm. The maximum decrease in the integrated value $$\int\limits_{\text{O}}^{\text{T}} {{\text{ATP}}}$$ dt with T=9 minutes occurred at the wavelength 450 nm. The ATP in a migrating plasmodium distributed twice as high in the front as in the rear. This polar pattern became unstable, and a new wavy pattern appeared by stimulating a local frontal part with blue light. In a concentrically extending plasmodium, peripheral and inside regions oscillated in opposite phase to each other. When part of this organism was exposed to light, stimulated and unslimulated regions began to oscillate in opposite phase, and phase waves propagated inward the stimulated region. And the protoplasm there became thinner, the strongest avoidance reaction occurring to 450 nm light as in ATP response. Phototactic behavior inPhysarum is discussed in terms of bifurcation in spatio-temporal organization appearing in a self-organizing system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01277050
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    Paper (German National Licenses)
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