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  • Articles: DFG German National Licenses  (7)
  • 1990-1994  (7)
  • 1985-1989
  • 1992  (5)
  • 1990  (2)
Source
  • Articles: DFG German National Licenses  (7)
Material
Years
  • 1990-1994  (7)
  • 1985-1989
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Influence of thin protective InAs layers on the optical quality of AlGaAs and quantum wells (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2449-2452 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Influence of a thin protective but subsequently evaporated InAs layer on the regrowth of AlGaAs has been studied. It was found that although most of the InAs could be evaporated by thermal desorption, some would react with Al0.36Ga0.64As to form InAlGaAs. These InAlGaAs islands act as potential wells for carrier recombination and dominate the photoluminescence spectrum. Transmission electron microscopy photographs show that dislocations are formed near the islands. These defects are caused by lattice mismatch between AlGaAs and InAlGaAs. These islands and defects strongly affect the optical quality of surrounding Al0.36Ga0.64As and quantum wells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351590
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Direct observation of Si delta-doped GaAs by transmission electron microscopy (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 2628-2630 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Direct observation of the Si delta-doped layer in GaAs has been achieved by high resolution transmission electron microscopy. Samples with different Si doses, from half a monolayer to two monolayers, were studied. The observed spreading of the delta-doped layer showed that Si atoms are largely confined in five monolayers at most (in the highest dose case), indicating excellent confinements of dopants in GaAs. From the images, the Si atoms were uniformly distributed in the doped layer, no cluster formation was observed. For delta-doped GaAs grown at low temperature (480 °C), stacking faults originated from the doped layers were observed. These faults were thought to be caused by the large unrelaxed strain in the low-temperature grown GaAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106902
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An experimental study of two-phase turbulent coaxial jets (1992)
    Springer
    Experiments in fluids 13 (1992), S. 279-287 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effect of solid particles on the flow structure of axisymmetric turbulent coaxial jets has been studied. A laser-Doppler anemometer was used to measure the mean and fluctuation velocities of both phases, and a Malvern laser diffraction instrument was applied to measure particle size and concentration. A series of velocity ratios and particle loading ratios were investigated, and the results were analysed for the effects of these ratios on the mixing characteristic and the similarity behavior of the jet. The effects of particle diameter and its distribution were also studied as well as their influence on the coaxial jet behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189021
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Particle concentration and particle size measurements in a particle laden turbulent free jet (1990)
    Springer
    Experiments in fluids 9 (1990), S. 320-322 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Particle concentration and particle size distribution curves have been measured for particle-laden jets of silica gel powder for different loading ratios and air velocities using a Laser Diffraction Method (LDM) and a tomography data transform technique. It was found that the mean particle size at the outer edge of the jet decreases with increasing gas velocity, and that the jet widens with decreasing particle concentration and increasing gas velocity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188760
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The number-density of stars in a spherically-symmetric system containing a massive black hole at its center (1992)
    Springer
    Astrophysics and space science 193 (1992), S. 99-104 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An object with a compact core is a configuration in various astrophysical problems. In this paper, considering general relativity, the number densities of stars in a spherically-symmetric system containing a massive black hole in its center has been obtained forv=4/3,5/3, and the non-relativistic case. The results obtained by Peebles (1972), Bahcall and Wolf (1976), and that obtained for an isothermal sphere case are discussed. Taking into account the stability of the system, it is found to be more rational to usen(r) ∼r −7/4 to express the number density of stars when they are near the massive central black hole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01070205
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The light curved in the CM field (1992)
    Springer
    Astrophysics and space science 197 (1992), S. 269-281 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we introduce the CM field in Sections 2 and 3 based on the paper by Wang and Peng (1985), and calculate the light curved in the CM field in Section 4. The result shows thatP makes ΔφCM larger than ΔφC at $$\theta \in (\cos ^{ - 1} \tfrac{1}{3},\pi - \cos ^{ - 1} \tfrac{1}{3})$$ , and smaller at $$\theta \in (\theta ,\cos ^{ - 1} \tfrac{1}{3}) \cup (\pi - \cos ^{ - 3} \tfrac{1}{3},\pi )$$ . Under a special circumstance which source, CM lens, and observer are in the same line, if we get Δφ| 0=0 , $$\Delta \phi |_{\theta = \cos ^{ - 1} } 1/3$$ and Δφ| θ=π/2 , we can determine theP(M) andQ(M) of the CM lens,M is the mass of the CM lens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645740
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    A free radical copolymerization model for simulating reactive processing of unsaturated polyester resins (1990)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 30 (1990), S. 684-692 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A free radical copolymerization model is proposed for simulating the reaction rates and conversions of styrene monomer and unsaturated polyester resins during curing. This model is based on film theory in which the rate constants reflect both reaction and diffusion resistances. Differential scanning calorimetry in combination with Fourier transform infrared spectroscopy is used to measure the overall and individual reactivities of reacting species. Model parameters are determined from experimental data. The applicability of this model is demonstrated in a cure simulation.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760301108
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    Paper (German National Licenses)
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