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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 52 (1968), S. 25-27 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents The potential of any quiet charge distribution is represented by a superposition of multipole potentials in a short and clear way. This representation corresponds to an expansion in series ofLegendre polynomials.
    Notes: Übersicht Das Potential einer beliebigen, ruhenden Ladungsverteilung wird als Überlagerung von Multipol-Potentialen dargestellt. Diese Darstellung entsprich einer Entwicklung nachLegendreschen Polynomen.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Lung 81 (1932), S. 630-634 
    ISSN: 1432-1750
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0649
    Keywords: 32.80Hd ; 42.55Hq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Soft x-rays from a laser-produced plasma were used to perform innershell photoionization of Cd atoms and to generate laser radiation at 442 nm. To achieve longer interaction zones between the Cd vapor and the soft x-ray flux, up to three plasma spots have been applied. In this way a maximum laser energy of 300 μJ with a 600 mJ Nd:YAG laser for the plasma production was achieved. Experimental investigations and corresponding rate-equation calculations indicate, that photoelectrons play an important role in the total laser kinetics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physics Letters A 96 (1983), S. 435-438 
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physics Letters A 111 (1985), S. 435-439 
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 230 (1971), S. 515-516 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] I suggest a different approach which avoids most of the shortcomings of the traditional method and which could lead to an accurate determination of the H2 : He ratio on Jupiter. This approach makes use of the timing of the "spikes" or intensity anomalies that have been observed and does not depend ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 4354-4357 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dark current characteristics of gallium arsenide doped with silicon and compensated with diffused copper were found to have a pronounced region of current controlled negative differential conductivity (ndc) similar to the characteristics of a thyristor. The resistivity of the semi-insulating semiconductor was measured to be 105 Ω cm for applied voltages up to 2.2 kV, which corresponds to an average electric field of 38 kV/cm. At higher voltages, a transition to a stable high current state was observed with a current rate of rise exceeding 1011 A/s. There is evidence of the formation of at least one current filament during this transition. A theoretical model based on drift diffusion and boundary conditions that allows double carrier injection at the contacts has been used to show that the observed negative differential resistance is due to the filling of deep copper acceptors. The model also shows that the ndc curves may be tailored by adjusting the copper concentration. Doping of GaAs with various concentrations of copper was shown to change the dark current characteristics in a way predicted by the model.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 318-323 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The subject of this paper is the mathematical modeling of a recently proposed class of electron-beam-controlled high-power semiconductor switches that are able to overcome the space-charge limitation of conventional electron bombarded semiconductor devices by utilizing the secondary ionization effects of cathodoluminiscence and bremsstrahlung. Current densities of several kA/cm2 at forward voltages some 10 V can be controlled with an electron beam of 100 keV and 1 A/cm2; holdoff voltages of more than 100 kV/cm and dark currents as small as 10 μA/cm2 are possible. The concept has several possible applications: Its fast and repetitive closing and opening under load makes it suitable for inductive energy storage applications; its linear characteristics suggests a use as a high-power modulation device.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 987-995 
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper is a contribution to the stability analysis of current-carrying plasmas, i.e., plasma systems that are forced by external mechanisms to carry a nonrelaxing electrical current. Under restriction to translationally invariant configurations, the thermodynamic stability criterion for a multicomponent plasma [Phys. Rev. Lett. 56, 143 (1986); Phys. Fluids 30, 3713 (1987)] is rederived within the framework of nonideal magnetohydrodynamics (MHD). The chosen dynamics neglects scalar resistivity, but allows for other types of dissipation effects both in Ohm's law and in the equation of motion. In the second section of the paper the thermodynamic stability criterion is compared with the ideal MHD based energy principle of Bernstein et al. [Proc. R. Soc. London Ser. A 244, 17 (1958)]. With the help of Schwarz's inequality it is shown that the former criterion is always more "pessimistic'' than the latter, i.e., that thermodynamic stability implies stability according to the MHD principle, but not vice versa. This result confirms the physical plausible idea that dissipational effects tend to weaken the stability properties of current-carrying plasma equilibria by breaking the constraints of ideal MHD and allowing for possibly destabilizing effects such as magnetic field line reconfiguration.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 3713-3723 
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A thermodynamic model is developed for plasma systems that are forced to carry an electrical current which prevents relaxation into global thermodynamic equilibrium. Complementary to earlier approaches in the framework of resistive magnetohydrodynamics, the role of nonresistive dissipation is analyzed by excluding momentum transfer between different particle species (electrons and ions). The general class of steady states compatible with the assumptions is found and their structures and symmetries are discussed. The second law of thermodynamics guarantees the existence of a generalized thermodynamic potential (including contributions of the electromagnetic field) which has a negative time derivate for all dynamical states subject to the equilibrium symmetry and boundary conditions. Applying Lyapunov's theory, this functional provides a necessary and sufficient stability criterion. The linearized version of this criterion and the corresponding eigenvalue problem are also derived.
    Type of Medium: Electronic Resource
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