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  • Institute of Physics  (78)
  • Springer  (45)
  • Springer Nature  (7)
  • American Institute of Physics (AIP)  (5)
  • 1
    Electronic Resource
    Electronic Resource
    A model for the current instabilities in GaAs-AlGaAs heterojunction (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1955-1960 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model is proposed for the description of the current instabilities in GaAs-AlGaAs heterojunctions. It consists of three parts: the injection of electrons via the contact into the AlGaAs layer, the partial capture of these electrons in deep centers, and the change with time of the band structure. This last ingredient is crucial, since due to the increase of the total number of electrons in the AlGaAs layer the band bending decreases making real-space transfer from the AlGaAs layer to the two-dimensional electron gas possible. We have performed quasistationary simulations of the time dependence of the current. The velocities, average energies, capture rates, etc. were taken from Monte Carlo simulations. It turned out, that the parameters for the modeling of the contact, which are to a high degree unknown, play an essential role. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361045
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrafast carrier dynamics at a metal-semiconductor interface (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6831-6838 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ultrafast carrier dynamics in the high electric field at an Au-GaAs interface has been studied experimentally as well as theoretically. The photoluminescence decay time is related directly to the carrier sweepout from the GaAs depletion region, i.e., to the time needed for photoexcited electrons and holes to leave this region. This decay time has been found to increase drastically with laser input power, ranging from a few picoseconds at low excitation to values of 10–20 ps at high excitation. These results indicate a significant retardation of the sweepout, which cannot be explained by intervalley scattering and space-charge effects. From our Monte Carlo calculations it has been found that the applied electric field collapses totally almost instantaneously after laser excitation due to the enormous excess of photoexcited charges. The sweepout only recovers after some time needed to recharge the device. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363749
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  • 3
    Electronic Resource
    Electronic Resource
    Carrier-carrier scattering induced capture in quantum well lasers (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1490-1492 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present calculations of the carrier capture efficiency into various types of quantum well lasers. The carrier capture into a quantum well can be due to either optical phonon emission or carrier-carrier scattering. Both capture mechanisms have been calculated and show oscillations as a function of the quantum well thickness. By optimizing the carrier capture efficiency the carrier accumulation in the barrier layers can be reduced, resulting in an improved modulation response and threshold current.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108668
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of wall compliance on the Goertler vortex instability (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 2000-2002 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of the flow of a viscous incompressible fluid over a curved compliant wall to longitudinal Goertler vortices is investigated. The compliant wall is modeled by a particularly simple equation relating the induced wall displacement to the pressure in the overlying fluid. Attention is restricted to the large Goertler number regime; this regime being appropriate to the most unstable Goertler mode. The effect of wall compliance on this most unstable mode is investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857932
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  • 5
    Electronic Resource
    Electronic Resource
    Eigenvalues associated with relaxed states of toroidal plasmas (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 3186-3195 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the theory of relaxed states of toroidal plasmas certain eigenvalues of the equation ∇×B=μB play a crucial role. These eigenvalues are associated with vanishing toroidal flux and determine the onset of current limitation in a toroidal discharge. In axisymmetric systems there are both periodic and axisymmetric eigenfunctions and it is important to know whether the eigenmode associated with the lowest eigenvalue is periodic or axisymmetric. This depends on the shape of the poloidal cross section and determines the nature of the current-limited discharge. The eigenvalues of periodic and axisymmetric modes have been computed in rectangular and elliptical cross sections and in reentrant Multipinch-like cross sections. The reentrant case required new numerical techniques, which are described. It is found that in rectangular and elliptic cross sections the lowest mode is always periodic. However, in the Multipinch a transition occurs in which the lowest eigenmode changes from periodic to axisymmetric as the "waist'' in the cross section is made narrower. The critical width is determined. These calculations suggest that in the GA Multipinch experiment [Nucl. Fusion 26, 255 (1986)] the current saturated discharge should be axisymmetric—unlike all other existing pinch experiments where it is periodic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866494
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  • 6
    Electronic Resource
    Electronic Resource
    The electroreduction of carbon monoxide at metal/zirconium hydrogen phosphate interfaces (1991)
    Springer
    Journal of applied electrochemistry 21 (1991), S. 552-554 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01018609
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  • 7
    Electronic Resource
    Electronic Resource
    Modelling Software for Dust Processes (1997)
    Springer
    Astrophysics and space science 251 (1997), S. 203-206 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new type of modelling software has been developed with two advances over previous designs. Firstly it includes both gas and surface chemistry with interchange between them via freeze/thaw and desorption. Secondly it allows physical conditions to vary during model runs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000796908837
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  • 8
    Electronic Resource
    Electronic Resource
    The centrifugal instability of a Stokes layer: asymmetric disturbances (1981)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 32 (1981), S. 102-106 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Es wird die zentrifugale Instabilität einer Stokes'schen Grenzschicht an einem Kreiszylinder gegenüber nicht-axisymmetrischen Störungen untersucht. Die früher benützten Gleichungen für dieses Problem sind korrigiert und numerisch gelöst worden.
    Notes: Abstract The centrifugal instability of a Stokes layer on a circular cylinder to non-axisymmetric disturbances is studied. The governing equations used previously for this problem are corrected, and numerical results are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00953553
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  • 9
    Electronic Resource
    Electronic Resource
    On direction-invariance of fractal dimension on a surface (1995)
    Springer
    Applied physics 60 (1995), S. 271-274 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.35.Bs; 68.90.+g
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. It is shown that fractal dimensions along line transects of a stationary, stochastic surface are all identical to one another, save that in one special direction the dimension may be less than in all others. We discuss the implications of this result for practical measurement of surface roughness and for interpretation of fractal dimension. It is argued that the result provides significant new motivation for employing fractal dimension as a canonical measure of surface roughness. Nevertheless, in view of the virtual direction-invariance of fractal dimension, measurement of scale assumes new significance. This matter is addressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538402
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  • 10
    Electronic Resource
    Electronic Resource
    On direction-invariance of fractal dimension on a surface (1995)
    Springer
    Applied physics 60 (1995), S. 271-274 
    Details
    ISSN: 1432-0630
    Keywords: 68.35.Bs ; 68.90.+g
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract It is shown that fractal dimensions along line transects of a stationary, stochastic surface are all identical to one another, save that in one special direction the dimension may be less than in all others. We discuss the implications of this result for practical measurement of surface roughness and for interpretation of fractal dimension. It is argued that the result provides significant new motivation for employing fractal dimension as a canonical measure of surface roughness. Nevertheless, in view of the virtual direction-invariance of fractal dimension, measurement of scale assumes new significance. This matter is addressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538402
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