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  • 1
    Electronic Resource
    Electronic Resource
    Time-resolved photoluminescence study of isoelectronic In-doped GaN films grown by metalorganic vapor-phase epitaxy (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 3224-3226 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-resolved photoluminescence spectra were used to characterize isoelectronically doped GaN:In films. Our results indicate that the recombination lifetime of the donor-bound-exciton transition of undoped GaN exhibits a strong dependence on temperature. When In is doped into the film, the recombination lifetime decreases sharply from 68 to 30 ps, regardless of the measured temperature and In source flow rate. These observations might be related to the isoelectronic In impurity itself in GaN, which creates shallow energy levels that predominate the recombination process. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126588
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Photoluminescence and photoluminescence excitation studies of as-grown and P-implanted GaN: On the nature of yellow luminescence (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 3349-3351 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied optical and electronic properties of isoelectronic P-implanted GaN films grown by metalorganic chemical vapor phase epitaxy. After rapid thermal annealing, a strong emission band around 430 nm was observed, which is attributed to the recombination of exciton bound to isoelectronic P-hole traps. From the Arrhenius plot, the hole binding energy of ∼180 meV and the exciton localization energy of 28 meV were obtained. According to first-principle total-energy calculations, the implantation process likely introduced NI and P-related defects. By using photoluminescence excitation technique, we found that the P-implantation-induced localized states not only increase the yellow luminescence but also suppress the transitions from the free carriers to deep levels. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1476400
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  • 3
    Electronic Resource
    Electronic Resource
    Solution of a periodic optimal control problem by asymptotic series (1987)
    Springer
    Journal of optimization theory and applications 52 (1987), S. 343-364 
    Details
    ISSN: 1573-2878
    Keywords: Periodic optimal control problems ; asymptotic series expansions ; Lindstedt and Poincaré expansions ; two-point boundary-value problems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In order to understand the numerical behavior of a certain class of periodic optimal control problems, a relatively simple problem is posed. The complexity of the extremal paths is uncovered by determining an analytic approximation to the solution by using the Lindstedt-Poincaré asymptotic series expansion. The key to obtaining this series is in the proper choice of the expansion parameter. The resulting expansion is essentially a harmonic series in which, for small values of the expansion parameter and a few terms of the series, excellent agreement with the numerical solution is obtained. A reasonable approximation of the solution is achieved for a relatively large value of the expansion parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00938212
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  • 4
    Electronic Resource
    Electronic Resource
    Control for Tractor-Semitrailer Vehicle Systems: A Lyapunov Minimax Approach (1999)
    Springer
    Dynamics and control 9 (1999), S. 21-37 
    Details
    ISSN: 1573-8450
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The problem of automated steering and independent braking control for a tractor-semitrailer vehicle system is addressed. The control is designed by combining the input/output linearization and Lyapunov minimax approach. The proposed design achieves, despite of the presence uncertainty, lane following and prevents the jack-knifing phenomenon of trailer yaw motion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008390607583
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  • 5
    Electronic Resource
    Electronic Resource
    Control of Discrete Fuzzy Systems: Uncertainty and Guaranteed Performance (1998)
    Springer
    Dynamics and control 8 (1998), S. 83-106 
    Details
    ISSN: 1573-8450
    Keywords: fuzzy modeling ; robust control ; stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Robust control designs for a discrete Takagi and Sugeno (T-S) fuzzy model are proposed. The T-S fuzzy model contains (possibly fast) time-varying uncertainty. First, a switching-type robust control is shown to stabilize the T-S fuzzy model asymptotically. Second, a saturation-type robust control is shown to render the T-S model practically stable. In both designs, only the bound of uncertainty is needed. The effectiveness of proposed designs is analyzed rigorously and illustrated by simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008231013911
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  • 6
    Electronic Resource
    Electronic Resource
    Optimal fastener pattern design considering bearing loads (1999)
    Springer
    Structural and multidisciplinary optimization 17 (1999), S. 140-146 
    Details
    ISSN: 1615-1488
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In many engineering structures, failure occurs either at the connection itself or in the component at the point of attachment of the connection. To extend the service life of the structure it is important to ensure that the loads borne by the connections are distributed as uniformly as possible. This would also minimize the possibility of localized high stress regions within the component. In this work a topology optimization based approach has been developed to incorporate fastener load constraints into a problem formulated for optimal location of fasteners. The computational results indicate that it is effective in reducing the maximum fastener loads without compromising on the overall stiffness of the structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01195938
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  • 7
    Electronic Resource
    Electronic Resource
    Immobilization of silicone stationary phases on supports using ozone (1987)
    Springer
    Chromatographia 23 (1987), S. 169-170 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Packed column ; Immobilized silicone stationary phases ; Ozonization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Immobilization of silicone stationary phases, OV-1701 vinyl and OV-225 vinyl, on Chromosorb W-AW support was achieved in a simple procedure using ozone as an initiator. A column efficiency of 2400 theoretical plates/meter was obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311474
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