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  • 11
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2659-2661 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Coupling efficiency of infrared radiation to electron intersubband transition in quantum well infrared photodetector by a two-dimensional (2D) grooved grating is examined. A resonant enhancement of the coupling efficiency at a certain optimal groove depth is predicted and confirmed experimentally. It is argued that a detector with a properly designed ordered cross grating performs better than a detector with optimized 2D random grating. In a detector with ordered grating a quantum efficiency of 75% is obtained with a doping level of only 3.5×1017 cm−3 in each quantum well and dark current density of 0.34 mA/cm2 at 78 K. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 12
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    Unknown
    Leiden : Periodicals Archive Online (PAO)
    Journal for the Study of Judaism in the Persian, Hellenistic, and Roman Period. 9 (1978) 1-28 
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied mechanics and technical physics 33 (1992), S. 222-229 
    ISSN: 1573-8620
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Fluid dynamics 26 (1991), S. 639-645 
    ISSN: 1573-8507
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The behavior of perturbations of a steady cylindrical front of arbitrary amplitude is investigated numerically. A calculation algorithm is developed on the basis of the well-known boundary integral equation method [7]. The conclusion [5] concerning the stability of the front in the case of an internal supply of medium for perturbations of arbitrary amplitude is confirmed. In the case of an external supply of medium (in the direction of decreasing radial coordinate) the instability of the front and the formation of radial low-viscosity “fingers” is demonstrated. The method proposed can easily be modified to permit the calculation of the motion of free surfaces and interfaces in chemically inert high-viscosity media. In this connection, it can be used for numerically modeling the flow of plastic and glass melts.
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Fluid dynamics 23 (1988), S. 361-367 
    ISSN: 1573-8507
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The hydrodynamic stability of the steady spherical front of a reaction accompanied by a strong increase in viscosity taking place in a radial, centrally symmetric flow of condensed reaction medium is considered. The flow is assumed to be bounded by two permeable concentric spherical surfaces. The stability is investigated in the linear approximation with respect to small perturbations. A relation is obtained for the dependence of the perturbation growth rate on the parameters of the problem: the viscosity ratio of the medium at the front, the ratio of the boundary surface radii to the radius of the front, and the dimensionless hydrodynamic resistances of the boundary surfaces. It is shown that the front is stable over almost the entire physical region of variation of the parameters and that instability occurs only in the case of a low hydrodynamic resistance of the outer boundary surface as the front approaches.
    Type of Medium: Electronic Resource
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  • 16
    ISSN: 1573-8329
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Analytical Biochemistry 115 (1981), S. 147-150 
    ISSN: 0003-2697
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric surgery international 10 (1995), S. 175-176 
    ISSN: 1437-9813
    Keywords: Cyclic neutropenia ; Clostridial myonecrosis ; Gas gangrene ; Clostridium septicum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A patient with cyclic neutropenia suffered full-thickness loss of her right abdominal wall and thigh muscles from clostridial myonecrosis. No port of entry was definitely identified. The sepsis and myonecrotic process were controlled by resuscitative measures, extensive multisession debribement, and hyperbaric treatment.
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Computing and visualization in science 3 (2000), S. 109-114 
    ISSN: 1433-0369
    Keywords: PACS: 35R35, 65M60, 80A22
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. The dissolution of an Al2Cu particle is considered. A characteristic property is that initially the particle has a non-smooth boundary. Furthermore the dissolution may be controlled by an interface reaction. The mathematical model of this dissolution process contains a description of the particle interface, of which the position varies in time. Such a model is called a Stefan problem. We use the finite element method to solve this problem numerically. The displacement of the free boundary is computed by a method based on the balance of atoms. This method leads to good results, also for non-smooth boundaries. Some numerical experiments are given for the dissolution of an Al2Cu particle in an Al-Cu alloy, with a varying rate of the interface reaction.
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 22 (1988), S. 347-354 
    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 Mit Hilfe der Methode der finiten Elemente wird eine Lösung der gekoppelten Wärmeund Stoffübertragung für die Absorption eines Dampfes, mit hoher Absorptionswärme, in einer laminaren Filmströmung beschrieben. Konvektion und Diffusion parallel und senkrecht zur Strömungsrichtung werden beobachtet. Temperaturund Massenfraktionsprofile werden gezeigt. Der Vergleich mit einer Lösung für eine ein-dimensionale Strömung und dazu senkrechter Diffusion zeigt, daß mit abnehmender Peclet-Zahl die Abweichungen zu unserem zwei-dimensionalen Modell steigen.
    Notes: Abstract A finite element solution is given for the coupled heat and mass transfer taking place when a vapour with considerable heat of absorption is absorbed into a laminar film flow. Convection and diffusion parallel and perpendicular to the direction of flow are taken into account. Temperature and mass fraction profiles across the film are given as well as results in film flow direction for several values of the Peclet number. Comparison with a solution based on one-dimensional flow and diffusion perpendicular to the flow, shows that deviations from this case by our two-dimensional solution increase for decreasing Peclet number.
    Type of Medium: Electronic Resource
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