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  • 1
    Electronic Resource
    Electronic Resource
    Carrier transport into intermixed GaAs/AlGaAs quantum wires (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1256-1258 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have realized GaAs/AlGaAs quantum wires using the implantation induced intermixing technique. The transport of carriers from the AlGaAs barriers into the intermixed quantum well (QW) is studied by comparing low temperature photoluminescence spectra at resonant and nonresonant excitation. It is shown that hardly any carriers generated in the AlGaAs are captured in the intermixed QW. At resonant excitation a large lateral diffusion length of carriers from the lateral barriers into the wires is observed which is reduced at higher temperatures due to implantation defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108751
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  • 2
    Electronic Resource
    Electronic Resource
    Time-resolved investigations of sidewall recombination in dry-etched GaAs wires (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2016-2018 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the sidewall recombination in dry-etched GaAs/GaAlAs wires with widths between 12 μm and 300 nm using picosecond spectroscopy. The wires were fabricated with electron beam lithography and different reactive ion etching processes. The excitonic lifetimes decrease strongly with decreasing wire widths due to sidewall recombination. Using a model calculation to fit the experimentally observed width dependence of the lifetimes the surface recombination velocity is determined to be S=2×106 cm/s at 50 K. S increases with temperature and is independent of the etching process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103003
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Carrier capture in intermixed quantum wires with sharp lateral confinement (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 48-50 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated GaAs/GaAlAs quantum wires with widths between 220 and 40 nm by high-dose (2×1014 cm−2) Ga implantation in a locally masked single quantum well structure. The width dependence of the emission energies indicates a steep 1D confinement determined by the lateral straggling of the implanted Ga. The external quantum efficiency of the wires increases strongly with decreasing mask width due to significant carrier capture from the lateral barrier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102643
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Efficient methods for enclosing solutions of systems of nonlinear equations (1990)
    Springer
    Computing 44 (1990), S. 221-235 
    Details
    ISSN: 1436-5057
    Keywords: 65G10 ; 65H10 ; Newton's method ; Newton-Gauss-Seidel method ; nonlinear equations ; R-order ; interval analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Wir betrachten Modifikationen des Intervall-Newton-Verfahrens, welche zwei Ansätze miteinander verbinden: Mehrfache (z.B.s-fache) Verwendung derselben Auswertung der Jacobi-Matrix und näherungsweise Lösung der Newton-Gleichung mit einem „linearen” Iterationsprozeß. Insbesondere zeigen wir, daß dieR-Ordnung dieser Verfahrens+1 werden kann. Wir illustrieren unsere Ergebnisse an einem numerischen Beispiel.
    Notes: Abstract We consider modifications of the interval Newton method which combine two ideas: Reusing the same evaluation of the Jacobian several (says) times and approximately solving the Newton equation by some ‘linear’ iterative process. We show in particular that theR-order of these methods may becomes+1. We illustrate our results by a numerical example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262218
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  • 5
    Electronic Resource
    Electronic Resource
    Numerical validation for an inverse matrix eigenvalue problem (1994)
    Springer
    Computing 53 (1994), S. 311-322 
    Details
    ISSN: 1436-5057
    Keywords: 65F15 ; 65G10 ; Inverse eigenvalue problem ; enclosure for the inverse eigenvalue problem ; interval computation ; Newton's method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Wir geben einen Algorithmus an, mit dem man Lösungen eines additiven inversen Matrizen-Eigenwertproblems nachweisen kann. Der Algorithmus beruht auf dem Newton-Verfahren, für das ein neues Abbruchkriterium verwendet wird. Er liefert enge Schranken für die Lösungen des Problems und garantiert so die meisten ihrer führenden Ziffern in einem gegebenem Gleitpunktsystem.
    Notes: Abstract We describe an algorithm with which one can verify solutions of an additive inverse matrix eigenvalue problem. The algorithm is based on Newton's method using a new criterion for terminating the iteration. In addition, it yields tight interval bounds for the solutions of the problem, thus guaranteeing most of their leading digits in a given floating point system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02307382
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  • 6
    Electronic Resource
    Electronic Resource
    Some remarks on two interval-arithmetic modifications of the newton method (1992)
    Springer
    Computing 48 (1992), S. 125-128 
    Details
    ISSN: 1436-5057
    Keywords: 65H10 ; 65G10 ; Nonlinear equations ; systems of nonlinear equations ; interval Newton method ; interval Gaussian algorithm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung In der vorliegenden Arbeit werden das Intervall-Newton-Verfahren und das vereinfachte Intervall-Newton-Verfahren betrachtet, um enge Schranken für die Lösungen nichtlinearer Gleichungssysteme zu erhalten. Unter starkem Bezug auf eine Arbeit von Alefeld über diese beiden Verfahren leiten wir einen Zusammenhang zwischen den beiden Matrizen her, die in der erwähnten Veröffentlichung bei der Formulierung hinreichender Konvergenzkriterien auftreten. Desweiteren beantworten wir eine dort gestellte Frage über den Abbruch der Verfahren nach endlich vielen Schritten.
    Notes: Abstract In this paper we consider the interval Newton method and its simplified version to find tight bounds for the solutions of systems of nonlinear equations. Referring to a paper of Alefeld on this subject, we derive a connection between the two matrices used there to formulate sufficient criteria for the convergence of these methods. We also answer an open question concerning the break down of the Newton method after a finite number of steps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02241710
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  • 7
    Electronic Resource
    Electronic Resource
    On the theory and practice of multisplitting methods in parallel computation (1992)
    Springer
    Computing 49 (1992), S. 63-74 
    Details
    ISSN: 1436-5057
    Keywords: 65W05 ; 65F10 ; 65N20 ; Multisplittings ; parallel iterative methods ; SOR method ; local memory parallel computer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Wir geben Konvergenz-und Vergleichsaussagen für parallele iterative Multisplitting-Verfahren mit verschiedenen Gewichtungsschemata. Insbesondere zeigen wir, daß bestimmte Gauss-Seidel Multisplitting-Verfahren nicht schneller konvergieren können als das gewöhnliche Gauss-Seidel-Verfahren. Wir berichten darüber hinaus über numerische Experimente auf einem 64-Prozessor-Rechner mit lokalem Speicher. Diese Experimente zeigen, daß der ‘naive’ Einsatz von Multisplittings leicht zu nicht zufriedenstellenden Ergebnissen führen kann, wenn mehr also nur ein paar Prozessoren eingesetzt werden.
    Notes: Abstract We present convergence and comparison theorems on parallel iterative multisplitting methods with different weighting schemes. In particular, we show that certain Gauss-Seidel multisplittings cannot converge faster than the usual Gauss-Seidel method. We also give numerical results on a 64 processor local memory computer. These experiments show that the ‘naive’ use of multisplittings can easily produce unsatisfactory results on parallel computers with more than just a few processors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02238650
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Plättchen-assoziierte Immunglobuline (PAIg) beim HELLP-Syndrom (1991)
    Springer
    Archives of gynecology and obstetrics 250 (1991), S. 695-704 
    Details
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372894
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  • 9
    Electronic Resource
    Electronic Resource
    Klinische und immunhämatologische Probleme nach antenataler Rhesus-Prophylaxe (1993)
    Springer
    Archives of gynecology and obstetrics 254 (1993), S. 1423-1424 
    Details
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02266458
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    Paper (German National Licenses)
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