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  • Articles: DFG German National Licenses  (9)
  • 2000-2004
  • 1990-1994  (9)
  • 1994  (9)
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  • Articles: DFG German National Licenses  (9)
Material
Years
  • 2000-2004
  • 1990-1994  (9)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Efficiency of photoluminescence and excess carrier confinement in InGaAsP/GaAs structures prepared by metal-organic chemical-vapor deposition (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 700-704 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Special double- and separate-confinement InGaAsP/GaAs heterostructures intended for photoluminescence measurements have been grown by low-pressure metal-organic chemical-vapor deposition. The band gap of the active region quaternary material was close to 1.5 eV, and the waveguide of the separate-confinement structures was near 1.8 eV. Measurement of the integrated luminescence efficiency at 300 K has shown that over a wide range of excitation level (10–103 W/cm2) radiative transitions are the dominant mechanism for excess carrier recombination in the active region of the structures studied. As determined by spectral measurements, the excess carrier concentration in the waveguide of the separate-confinement heterostructures and the intensity of the waveguide emission band correspond to a condition of thermal equilibrium of the excess carrier populations in the active region and the waveguide. The ratio of the intensity of the waveguide emission to the active region emission fits a model which assumes that the barrier height for minority carriers (holes) is equal to the difference in band gaps between the active region and the waveguide region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358519
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Local stoichiometry measurement of Y-Ba-Cu-O thin layers grown by metal organic chemical vapor deposition (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 4092-4096 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Y-Ba-Cu-O thin films with different stoichiometry were grown by metal organic chemical vapor deposition on MgO and SrTiO3. The samples showed superconducting behavior in a wide range of average stoichiometry. However, energy dispersive x-ray spectroscopy (EDX) measurements show that best results can be obtained only in a small stoichiometry range. Critical temperatures of Tc(approximately-greater-than)89 K and critical current densities of jc (77 K)(approximately-greater-than)2×106 A/cm2 could be obtained with optimized stoichiometry. Spatially resolved EDX measurements show that copper tends to form precipitates on the layers if its average content exceeds 50 mol %, while yttrium is incorporated into the matrix if offered in excess.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355987
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Correlation between x-ray diffraction patterns and strain distribution inside GaInP/GaAs superlattices (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2812-2814 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Strong correlation between x-ray diffraction characteristics and strain distribution inside GaInP/GaAs superlattices has been reported. It is found that the symmetry of (002) diffraction patterns can be used to evaluate the interface strain status. A sample with no interfacial strains has a symmetric (002) diffraction pattern and weak (004) diffraction pattern. It is also demonstrated that strain distribution in superlattices can be readily estimated qualitatively by analyzing x-ray diffraction patterns. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112574
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    High-power InGaAsP/GaAs 0.8-μm laser diodes and peculiarities of operational characteristics (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1004-1005 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-power operation of 3 W in pulse mode, 750 mW in quasi-continuous wave and 650 mW in continuous wave per uncoated facet from 100-μm aperture has been demonstrated for 1-mm-long cavity InGaAsP/GaAs 808-nm laser diodes prepared by low-pressure metalorganic chemical vapor deposition. Threshold current density of 300 A/cm2, differential efficiency of 1.1 W/A, T0=155 °C, transverse beam divergence of 27°, and less than 2-nm linewidth at 808 nm have been measured. No degradation has been observed after 1000 h of operation in a quasi-continuous wave regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112206
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Theoretical investigation of minority carrier leakages of high-power 0.8 μm InGaAsP/InGaP/GaAs laser diodes (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2260-2262 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a theoretical model that accurately describes the effects of minority carrier leakage from the InGaAsP waveguide into InGaP cladding layers in high-power aluminum-free 0.8 μm InGaAsP/InGaP/GaAs separate confinement heterostructure lasers. Current leakage due to the relatively low band-gap discontinuity between the active region and the InGaP barrier can be eliminated by employing laser diodes with cavity length longer than 500 μm. Experimental results for lasers grown by low-pressure metalorganic chemical vapor deposition are in excellent agreement with the theoretical model. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112738
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The self-organizing methods of long-term forecasting (I) — GMDH and GMPSC model (1994)
    Springer
    Meteorology and atmospheric physics 53 (1994), S. 155-160 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary First, the Group Method of Data Handling (GMDH) algorithm, a self-organizing method for constructing higher order regression, is applied to build a model for long-term forecasting. Then, the Group Method of Phase Space Component (GMPSC) model is set up based on chaos theory and GMDH. Several case studies show that both GMDH and GMPSC provide an efficient and potentially useful tool for non-linear time series modeling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01029610
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Electrophysiological evidence for a spinal antinociceptive action of dipyrone (1994)
    Springer
    Inflammation research 41 (1994), S. 62-70 
    Details
    ISSN: 1420-908X
    Keywords: Dipyrone ; Metamizol ; Spinal cord ; Afferent fibres ; Inflammatory pain
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Electrophysiological experiments in anesthetized cats and rats were performed in order to study the effects of dipyrone on single afferent fibers from the knee joint and on spinal cord neurons with knee joint input. The neurons were activated and/or rendered hyperexcitable by an acute inflammation in the knee joint. In the joint nerve in cats, intravenous dipyrone (25–100 mg/kg) reduced ongoing activity in 10/12 thinly myelinated afferents but only in 1/10 unmyelinated afferents; the responses to movements of the inflamed knee were reduced in 8/10 thinly myelinated but only in 3/10 unmyelinated units. The reduction of activity was significant 20–30 min after application and was maximal at 60–180 min. In the spinal cord of spinalized cats, intravenous dipyrone (25–100 mg/kg) reduced ongoing activity and/or responses to pressure onto the inflamed knee in 14/16 neurons and in non-spinalized rats similar effects were seen in 10/11 neurons. Effects on spinal cord neurons started 5–10 min after application and were maximal after 20–40 min. These data show pronounced suppression of inflammation-induced nociception by dipyrone and they suggest that the spinal cord is a major site of action of this compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01986396
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Persistence, stability and level crossings in an integrodifferential system (1994)
    Springer
    Journal of mathematical biology 32 (1994), S. 395-426 
    Details
    ISSN: 1432-1416
    Keywords: Uniform persistence ; stability ; Lyapunov functional ; level-crossing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Dynamical characteristics of an integrodifferential system modelling two species competition with hereditary effects are investigated; in particular we derive sufficient conditions for the persistence of the species, existence of an attracting periodic solution and ‘level-crossings’ of solutions about the periodic solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00160166
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    NLS-tupe equations in 2+1 dimensions: New type of solutions and non-isospectral problems (1994)
    Springer
    Theoretical and mathematical physics 99 (1994), S. 662-667 
    Details
    ISSN: 1573-9333
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Integrable systems of NLS type in 2+1 dimensions are studied in three ways: their special solutions by Lie point symmetries, ‘breaking’-solutions by the ISM, as well as the non-isospectral problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01017049
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    Paper (German National Licenses)
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