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  • 1985-1989  (21)
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  • 1
    Electronic Resource
    Electronic Resource
    Low-loss substrate for epitaxial growth of high-temperature superconductor thin films (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2677-2679 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A perovskite-like single-crystal substrate material has been investigated that simultaneously permits epitaxial growth of 1-2-3 superconductor films and possesses desirable rf properties of low dielectric constant and loss tangent. The lattice constant of 3.792 A(ring) provides a lattice match to within 1% of the a axis of 1-2-3. Sputtered films of erbium-barium-copper-oxide have been produced on (100) LaAlO3 substrates that exhibit sharp resistive transitions at 90 K (ΔT=1K), bulk superconductivity as determined by ac susceptibility measurements, and nearly single-crystal growth as evidenced by x-ray diffraction and high-resolution scanning electron microscopy. The high-frequency dielectric properties of LaAlO3 were experimentally investigated at several temperatures. The low-frequency dielectric constant was measured to be 15 and the microwave loss tangent ranged from 6×10−4 at room temperature to 5×10−6 at 4 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100543
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  • 2
    Electronic Resource
    Electronic Resource
    Mutual phase locking in series arrays of Josephson tunnel junctions at millimeter-wave frequencies (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 465-468 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mutual phase locking has been demonstrated in series arrays of two and four Josephson junctions at millimeter-wave frequencies. Experimental observations are in good agreement with theory reported earlier. This technique increases the output power available from a Josephson junction source. Available output power is expected to be proportional to the square of the number of junctions until the array impedance approaches the load impedance. The output frequency is voltage tunable over as much as an octave. Theory indicates that the technique can be extended to even larger arrays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337625
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  • 3
    Electronic Resource
    Electronic Resource
    Negative differential resistance in a strained-layer quantum-well structure with a bound state (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3453-3456 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Strained-layer resonant tunneling structures of pseudomorphic GaAs-AlAs-In0.09Ga0.91As-AlAs-GaAs are studied both experimentally and with a simple quantum mechanical model. The energy spectrum of the unbiased structure includes the usual resonant states and also bound states due to the narrow-band gap InGaAs well. Strong tunneling (and negative differential resistance) are observed for the resonant states. We observe for the first time tunneling associated with a "bound-state'' energy level which result in a zero differential conductance feature. Qualitative agreement between the experimental and calculated results are shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339315
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  • 4
    Electronic Resource
    Electronic Resource
    Radial fluctuation scale of ion temperature gradient driven turbulence (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 2920-2927 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown that ion temperature gradient driven turbulence supports fluctuations with broader radial scales than those inferred previously on the basis of mixing length arguments derived from the eigenfunction with lowest radial eigenmode number. These fluctuations of greater radial extent are more strongly excited and are shown to result in fluctuation levels and transport coefficients that can be considerably larger than those previously predicted. It is expected that transport of this nature would maintain ion temperature and density profiles near marginal stability in neutral beam heated and ion cyclotron resonance heated plasmas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.867023
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  • 5
    Electronic Resource
    Electronic Resource
    Fluctuation spectrum of resistive pressure-gradient-driven turbulence (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 119-133 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spatial structure of resistive pressure-gradient-driven turbulence is studied analytically with renormalized two-point spectrum equations and numerically by multihelicity nonlinear calculations. The wavenumber spectra for the pressure fluctuations and electrostatic potential fluctuations have been calculated with spectral analysis techniques. The least-squares fit of the numerically calculated wavenumber spectrum to a power law yields a pressure fluctuation spectrum 〈p˜2〉m∼m−(2.4±0.4) and an electrostatic potential fluctuation spectrum 〈φ˜2〉m∼m−(4.3±0.3). These results agree with the predictions of the analytic theory. The power-law decay indexes of energylike spectra show the three-dimensionality of resistive pressure-gradient-driven turbulence, even in a plasma with a strong axial magnetic field. This characteristic of resistive fluid turbulence arises from the important role of the resistivity as an integral part of plasma turbulence and differentiates the resistive plasma turbulence from the homogeneous fluid turbulence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859090
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamics of magnetic relaxation in a high-temperature, current-carrying plasma (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 99-108 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of a study of the role of multiple-helicity nonlinear interaction of tearing modes and the dynamics of magnetic relaxation and dynamo activity in a high-temperature, current-carrying plasma are described. A set of fluid equations for tearing modes in the semicollisional regime is derived, and a previous resistive magnetohydrodynamic study of tearing mode turbulence is thus extended to high-temperature regimes. Because of the direct connection between fluctuation evolution and configuration evolution, a generalized nonlinear theory of the turbulent dynamo and magnetic relaxation is proposed, and a two-point 〈(∇⊥p˜)ψ˜〉-correlation evolution is determined by calculating the relaxation time τcl. This calculated relaxation time is shown to serve as the phase shift between v˜r and ψ˜ and hence to control magnetic energy relaxation and dynamo processes. Careful study of the two separated regions of kink-tearing modes (i.e., the resonant region and the exterior region) reveals the direct relationship between the equilibrium magnetic energy relaxation and average magnetic flux evolution. Thus a theoretical interpretation of the observed correlation between magnetic fluctuations and maintenance of field reversal is provided. Finally, the correlation lifetime of the flux transport term is evaluated from the renormalized two-point theory, and the saturated magnetic fluctuation level is estimated. The result shows that the saturation level is independent of or very weakly dependent on the Lundquist number S. The implications of this result for anomalous thermal transport and dynamo activity in high-temperature reversed field pinch experiments are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859056
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamics and fluctuation spectra of electrostatic resistive interchange turbulence (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 2871-2880 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The saturation mechanism for density and potential fluctuation spectra that evolve from linearly unstable electrostatic resistive interchange modes are investigated using particle simulations. Detailed comparisons of the nonlinear evolution, saturation levels, and resultant spectra between two- and three-dimensional sheared magnetic field configurations are made. Significant differences appear. The single rational surface, quasilinear-dominated evolution, fluctuation spectrum is adequately described using a density convection model. For the multiple rational surface case, the potential fluctuations are adequately represented by a balance between the nonlinearly modified source (curvature drive) and linear sink (parallel resistive field line diffusion). An accurate description of the density spectrum requires a mode coupling theory based on the two-point density correlation evolution equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865487
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  • 8
    Electronic Resource
    Electronic Resource
    Theory of ion-temperature-gradient-driven turbulence in tokamaks (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 3291-3313 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analytic theory of ion-temperature-gradient-driven turbulence in tokamaks is presented. Energy-conserving, renormalized spectrum equations are derived and solved in order to obtain the spectra of stationary ion-temperature-gradient-driven turbulence. Corrections to mixing-length estimates are calculated explicitly. The resulting anomalous ion thermal diffusivity χi=0.4[(π/2)ln(1+ηi)]2[(1+ηi)/τ]2 ρ2pcs/Ls is derived and is found to be consistent with experimentally deduced thermal diffusivities. The associated electron thermal and particle diffusivity, and particle and heat-pinch velocities are also calculated. The effect of impurity gradients on saturated ion-temperature-gradient-driven turbulence is discussed and a related explanation of density profile steepening during Z-mode operation is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865846
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  • 9
    Electronic Resource
    Electronic Resource
    Shape selective alkylation of polynuclear aromatics with mordenite-type catalysts: A high yield synthesis of 4,4′-Diisopropylbiphenyl (1989)
    Springer
    Catalysis letters 2 (1989), S. 243-247 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Unique dealuminated mordenite zeolites with a high proportion of mesopores behave as shape selective catalysts in the liquid phase alkylation of biphenyl with propylene. Dealumination reduces deactivation and the mesopores enhance diffusion. High yields of 4,4′-diisopropylbiphenyl (〉 70%) are observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00766213
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  • 10
    Electronic Resource
    Electronic Resource
    Optimizing the design of an activated sludge/secondary clarifier system via univariate search technique (1987)
    Springer
    Water, air & soil pollution 34 (1987), S. 1-9 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This article presents a simple and effective univariate search technique which is suitable for optimizing the design of an activated sludge/secondary clarifier system on microcomputers. The usefulness of the proposed optimal design procedure was tested on an IBM personal computer (IBM-PC). The results of this study indicated that the least-cost design of a typical activated sludge/secondary clarifier system can be obtained within 4 min on an IBM-PC. Besides, the proposed procedure was also found capable of obtaining the optimum solution over a wide range of initial step size of search chosen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00176863
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