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  • 1
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    Crustal Evolution of the Rhine Graben area - I. Exploring the lower crust in the Rhine Graben Rift by unified geophysical experiments (1987)
    In:  Tectonophysics 141: 261-275
    Details
    Publication Date: 1987
    Keywords: KTB 84, Southern Germany, Rhine Graben, crustal evolution, tectonics/crustal structure, reflection seismics, refraction seismics
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    CITATION DEKORP
  • 2
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    Near-vertical and wide-angle seismic surveys in the Black Forest, SW-Germany (1987)
    In:  In: Emmermann, R., Wohlenberg, J (eds.), The German Continental Deep Drilling Program (KTB). Berlin, Heidelberg, New York : Springer, pp. 297-362 / also in: Journal of Geophysics 62: 1-30
    Details
    Publication Date: 1987
    Keywords: KTB 84, Black Forest, Southern Germany, reflection seismics, refraction seismics, seismic attributes, seismic processing/methodology
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    CITATION DEKORP
  • 3
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    Nonlinear hyperbolic theory of thermal waves in metals (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A closed-form solution for cylindrical thermal waves in metals is given based on the nonlinear hyperbolic system of energy-conservation and heat-flux relaxation equations. It is shown that heat released from a line source propagates radially outward with finite speed in the form of a thermal wave which exhibits a discontinuous wave front. Unique nonlinear thermal-wave solutions exist up to a critical amount of driving energy, i.e., for larger energy releases, the thermal flow becomes multivalued (occurrence of shock waves). By comparison, it is demonstrated that the parabolic thermal-wave theory gives, in general, a misleading picture of the profile and propagation of thermal waves and leads to physical (infinite speed of heat propagation) and mathematical (divergent energy integrals) difficulties. Attention is drawn to the importance of temporal heat-flux relaxation for the physical understanding of fast transient processes such as thermal waves and more general explosions and implosions.
    Keywords: METALLIC MATERIALS
    Type: Journal of Chemical Physics; 63; Sept. 1
    Format: text
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  • 4
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    Boundary-value problem for plasma centrifuge at arbitrary magnetic Reynolds numbers (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: We solve in closed form the boundary-value problem for the partial differential equations which describe the (azimuthal) rotation velocity and induced magnetic fields in a cylindrical plasma centrifuge with ring electrodes of different radii and an external, axial magnetic field. The electric field, current density, and velocity distributions are discussed in terms of the Hartmann number H and the magnetic Reynolds number R. For small Hall coefficients, the induced magnetic field does not affect the plasma rotation. As a result of the Lorentz forces, the plasma rotates with speeds as high as 100,000 cm/sec around its axis of symmetry at typical conditions, so that the lighter (heavier) ion and atom components are enriched at (off) the center of the discharge cylinder.
    Keywords: PLASMA PHYSICS
    Type: Physical Review A - General Physics; vol. 15
    Format: text
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  • 5
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    Plasma rotation by electric and magnetic fields in a discharge cylinder (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A theoretical model for an electric discharge consisting of a spatially diverging plasma sustained electrically between a small ring cathode and a larger ring anode in a cylindrical chamber with an axial magnetic field is developed to study the rotation of the discharge plasma in the crossed electric and magnetic fields. The associated boundary-value problem for the coupled partial differential equations which describe the electric potential and the plasma velocity fields is solved in closed form. The electric field, current density, and velocity distributions are discussed in terms of the Hartmann number and the Hall coefficient. As a result of Lorentz forces, the plasma rotates with speeds as high as 1 million cm/sec around its axis of symmetry at typical conditions. As an application, it is noted that rotating discharges of this type could be used to develop a high-density plasma-ultracentrifuge driven by j x B forces, in which the lighter (heavier) ion and atom components would be enriched in (off) the center of the discharge cylinder.
    Keywords: PLASMA PHYSICS
    Type: Journal of Applied Physics; 48; Feb. 197
    Format: text
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  • 6
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    Transient ion neutralization by electrons. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The nonlinear initial-boundary-value problems describing the lateral neutralization of ion beams for the cases that (1) an auxiliary electric field accelerates the electrons into the ion space, and (2) the electrons are injected into the ion space at a prescribed current density are treated. Analytical solutions are derived which give the position and speed of the neutralization front as a function of time, and the temporal development of the electron density, velocity, and electric fields during the neutralization process.
    Keywords: PHYSICS, GENERAL
    Type: Journal of Applied Physics; 44; Oct. 197
    Format: text
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  • 7
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    Boundary-value problem for a counterrotating electrical discharge in an axial magnetic field (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: An electrical discharge between two ring electrodes embedded in the mantle of a cylindrical chamber is considered, in which the plasma in the anode and cathode regions rotates in opposite directions under the influence of an external axial magnetic field. The associated boundary-value problem for the coupled partial differential equations describing the azimuthal velocity and radial current-density fields is solved in closed form. The velocity, current density, induced magnetic induction, and electric fields are presented for typical Hartmann numbers, magnetic Reynolds numbers, and geometry parameters. The discharge is shown to produce anodic and cathodic plasma sections rotating at speeds of the order 1,000,000 cm/sec for conventional magnetic field intensities. Possible application of the magnetoactive discharge as a plasma centrifuge for isotope separation is discussed.
    Keywords: PLASMA PHYSICS
    Type: Journal of Applied Physics; 49; Jan. 197
    Format: text
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  • 8
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    Nonlinear theory of electron neutralization waves in ions beams with dissipation (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: An analytical theory of nonlinear neutralization waves generated by injection of electrons from a grid in the direction of a homogeneous ion beam of uniform velocity and infinite extension is presented. The electrons are assumed to interact with the ions through the self-consistent space charge field and by strong collective interactions, while diffusion in the pressure gradient is disregarded (zero-temperature approximation). The associated nonlinear boundary-value problem is solved in closed form by means of a von Mises transformation. It is shown that the electron gas moves into the ion space in the form of a discontinuous neutralization wave, which exhibits a periodic field structure (incomplete neutralization). This periodic wave structure is damped out by intercomponent momentum transfer - i.e., after a few relaxation lengths a quasi-neutral plasma results.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physics of Fluids; 17; Oct. 197
    Format: text
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  • 9
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    Intercomponent momentum transport and electrical conductivity of collisionless plasma (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Based on the Lenard-Balescu equation, the interaction integral for the intercomponent momentum transfer in a two-component, collisionless plasma is evaluated in closed form. The distribution functions of the electrons and ions are represented in the form of nonisothermal, displaced Maxwellians corresponding to the 5-moment approximation. As an application, the transport of electrical current in an electric field is discussed for infrasonic up to sonic electron-ion drift velocities.
    Keywords: PHYSICS, PLASMA
    Type: Canadian Journal of Physics; 51; Dec. 15
    Format: text
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  • 10
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    A spectroscopic method of temperature measurement which does not require transition probabilities (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Spectroscopic method of temperature and pressure measurement in a plasma by comparing intensity ratios of spectral lines
    Keywords: CHEMISTRY
    Type: NASA-CR-382
    Format: application/pdf
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