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  • 1
    Electronic Resource
    Electronic Resource
    Tracing interfaces in porous media
    Amsterdam : Elsevier
    Physica A: Statistical Mechanics and its Applications 191 (1992), S. 253-257 
    Details
    ISSN: 0378-4371
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-4371(92)90535-X
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  • 2
    Electronic Resource
    Electronic Resource
    Interplay between the Anderson model of localization and BCS superconductivity: The finite band width transition
    Amsterdam : Elsevier
    Physica B: Physics of Condensed Matter 194-196 (1994), S. 1463-1464 
    Details
    ISSN: 0921-4526
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4526(94)91231-9
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  • 3
    Electronic Resource
    Electronic Resource
    The linear and nonlinear shear instability of a fluid sheet (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 2392-2400 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical and computational investigation of the inviscid Kelvin–Helmholtz instability of a two-dimensional fluid sheet is presented. Both linear and nonlinear analyses are performed. The study considers the temporal dilational (symmetric) and sinuous (antisymmetric) instability of a sheet of finite thickness, including the effect of surface tension and the density difference between the fluid in the sheet and the surrounding fluid. Previous linear-theory results are extended to include the complete range of density ratios and thickness-to-wavelength ratios. It is shown that all sinuous waves are stable when the dimensionless sheet thickness is less than a critical value that depends on the density ratio. At low density ratios, the growth rate of the sinuous waves is larger than that of the dilational waves, in agreement with previous results. At higher density ratios, it is shown that the dilational waves have a higher growth rate. The nonlinear calculations indicate the existence of sinuous oscillating modes when the density ratio is of the order of 1. Sinuous modes may result in ligaments interspaced by half of a wavelength. Dilational modes grow monotonically and may result in ligaments interspaced by one wavelength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858177
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear growth of Kelvin–Helmholtz instability: Effect of surface tension and density ratio (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 1845-1855 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear evolution of initially small disturbances at an interface separating two fluids of different density and velocity, including surface tension effects, is investigated with the use of the vortex-sheet discretization approach. The location of the interface is tracked in time by following the motion of each vortex under the combined influence of all other vortices. The influence of surface tension and density discontinuity is incorporated in an equation governing the evolution of the circulation of each vortex. Increasing the surface tension or the density ratio is shown to reduce the growth of the disturbance. For density ratios larger than 0.2 a critical wavenumber exists that divides the unstable part of the spectrum into a region where a vorticity singularity can develop (with interface rollup) and a region where two finite vortical centers are formed (with partial or no rollup). For lower density ratios this bifurcation phenomenon is not observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866682
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  • 5
    Electronic Resource
    Electronic Resource
    Heat transfer analysis of a particle-containing channel flow (1991)
    Springer
    Heat and mass transfer 26 (1991), S. 153-161 
    Details
    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 Diese Arbeit beschreibt ein analytisches Modell der Wärmeübertragung in einer zweidimensionalen, stetigen, nichtreaktiven mit Partikeln beladenen Kanalströmung. Zwischen zwei parallelen, isolierten Platten wurde eine ideale Gasströmung mit einer bestimmten gleichmäßigen Geschwindigkeit angenommen und die nichtverdampfenden Partikel sind so anzusehen, falls sie in einer dünnen Schicht enthalten sind, die in der Symmetrieebene eingeblasen wird. Zwei dimensionslose Parameter, die die Lösung beeinflussen, sind beschrieben worden. Dies sind die effektive Gas-DiffusionskonstanteK und die PartikelzahldichteP. Die linearen, gekoppelten Differentialgleichungen, die den Energieaustausch zwischen Gas- und Flüssigkeitsphase erfassen, sind mit der Greenschen Funktion gelöst worden. Durch dieses Verfahren erzielt man eine Reihe von Volterra-Integralgleichungen als Lösung der Energiegleichung der Gasphasen. Eine Reihe von Lösungen dieser Integralgleichungen wurde mit dem sukzessiven Substitutionsverfahren erhalten und die Terme wurden bis zur zweiten Ordnung berechnet.
    Notes: Abstract This paper describes an analytical model of heat transfer in a two-dimensional, steady, nonreacting particle-containing channel flow. An idealized gas flow of specified uniform velocity between insulated parallel plates is assumed and the nonvaporizing particles are conceptualized as contained within an thin sheet injected at the symmetry plane. Two dimensionless parameters that affect the solution are described. These are the effective gas diffusivityK and the dimensionless particle number densityP. The linear, coupled differential equations governing the energy exchange between the gas and liquid phases are solved by means of the Green's function technique. This procedure yields a Volterra integral-series equation as the solution of the gas-phase energy equation. A series solution of this integral equation is obtained by the method of successive substitutions and terms up to second order are calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01590115
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  • 6
    Electronic Resource
    Electronic Resource
    Persistent non-ergodic fluctuations in mesoscopic insulators: The NSS model in the unitary and symplectic ensembles (2002)
    Springer
    The European physical journal 30 (2002), S. 101-109 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.23.An Theories and models; localized states – 71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect – 72.20.Ee Mobility edges; hopping transport – 74.40.+k Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We give a detailed picture of the mesoscopic conductance fluctuations in the deep insulating regime (DIR) within the Nguyen, Spivak and Shklovskii model in the unitary and symplectic ensembles. Slutski's theorem is invoked to rigorously state the ergodic problem for conductance fluctuations in the DIR, in contrast with previous studies. A weakly decaying behavior of the log-conductance correlation function, even weaker when spin-orbit scatterers are included, is established on the relevant field scale of the model. Such a slow decay implies that the stochastic process, defined by the fluctuations of the log-conductance, is non-ergodic in the mean square sense in the ensembles with the reported symmetries. The results can be interpreted in terms of the effective number of samples within the available magnetic scale. Using the replica approach, we derive the strong localisation counterparts of the well known 'cooperon' and 'diffuson' which permit analyzing quantitatively the decaying behavior of the correlation function and reveal its symmetry related properties in agreement with the numerical results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00363-x
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of the Intragrain Critical Current Density and Thermogravimetric Analysis on YBCO/Ag Superconductors Irradiated with 60Co Gamma Rays (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 641-648 
    Details
    ISSN: 1572-9605
    Keywords: YBaCuO ; gamma irradiation ; critical current density ; flux pinning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We investigated the flux pinning behavior induced by gamma irradiation in Y1Ba2Cu3O(7−x) silver-added samples. The superconductors were prepared through solid-state route and added with silver in amounts of 0-, 6.5-, and 20-wt%, following which the samples were irradiated by high-energy gamma irradiation (γ) at doses of 0, 500, and 1500 kGy at the dosage rate of 8.2 kGy/h. We performed magnetization loops to study the flux pinning of vortex in YBCO/Ag superconductors. We found that silver addition and irradiation on superconductors may increase the width in magnetization loops, which is related to the enhancement in the critical current density, J c . We established that an interaction between silver addition and irradiation that results in higher values in J c for YBCO/Ag irradiated samples already exists. The J c in samples containing 20-wt% of silver decreased with irradiation because a higher content of silver produces small crystals and secondary phases growing. On comparing the TGA analysis for both YBCO and YBCO/Ag samples, we found higher-weight oxygen losses in YBCO silver samples, which suggests that silver increases the oxygen saturation content. The higher oxygen content found on irradiated specimens it is indicative of oxygen losses from CuO chains or CuO2 planes reached by γ-irradiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007748018298
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  • 8
    Electronic Resource
    Electronic Resource
    Nonequilibrium contributions to the electric response of dirty superconductors (1988)
    Springer
    Journal of low temperature physics 73 (1988), S. 221-227 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Comparison of the measured microwave response in the presence of a dc current in narrow films of tin nearT c with the results from microscopic theory shows good agreement. Nonequilibrium effects become important when the frequency ω becomes of the order of the inverse inelastic relaxation time τ E −1 ≈(k B T c 3 /ℏν D 2 ) (νD is the Debye temperature) even if ω remains well below the gap frequency Δ0(T)/ℏ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681978
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  • 9
    Electronic Resource
    Electronic Resource
    Numerical analysis of the deformation and solidification of a single droplet impinging onto a flat substrate (1993)
    Springer
    Journal of materials science 28 (1993), S. 3313-3321 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An existing model has been modified to explore the deformation and solidification of a single droplet impinging on a substrate. The modification accounts for possible solid fraction of material at impact. Numerical results predict that the kinetic energy dominates the process at impinging velocities greater than about 100 m s−1. In addition, the thermal diffusivity of the solidifying material controls the process, but the temperature of the substrate relative to the melting temperature of the material must be considered when comparing materials. It is believed that droplets solidifying into thinner, wider discs would reduce porosity; therefore, dense materials accelerated to high speed would solidify into masses with the highest bulk density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354253
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  • 10
    Electronic Resource
    Electronic Resource
    An improved model for droplet solidification on a flat surface (1997)
    Springer
    Journal of materials science 32 (1997), S. 1519-1530 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An existing model of the deformation and solidification of a single droplet impinging on a cold surface has been revised and improved. The original model is based on a two-dimensional axisymmetric flow approximation of the velocity field, the Neumann solution to the one-dimensional Stefan solidification problem, and an integral mechanical energy balance. The improved model features a more appropriate velocity field which satisfies the no-shear boundary condition at the free surface, and an accurate derivation of the dissipation term from the mechanical energy equation. This equation has been solved numerically. Comparisons of the original and the improved models have been performed. Results show that the original model over-estimates the final splat size by about 10%. The discrepancy is more pronounced at larger Weber numbers, where viscous effects dominate. The effects of the Weber number, We, the Reynolds numbers, Re, and the solidification parameter have been investigated through detailed numerical calculations. Two regimes of spreading/solidification have been identified. If Re/We is small, the process is one of dissipation of the incident droplet kinetic energy; whereas for large values of Re/We the process can rather be characterized as a transfer between kinetic and potential energy. In the latter case, the variations of the final splat size versus the solidification constant exhibit a non-monotonic behaviour. This indicates that, for a given material, the deposition process can be optimized. Correlations relating the final splat size to the process parameters are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018522521531
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