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  • 1
    Electronic Resource
    Electronic Resource
    Comment on the adsorption of hydrogen sulfide on alumina (1986)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 90 (1986), S. 980-981 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100277a055
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  • 2
    Electronic Resource
    Electronic Resource
    Ideal-preserving Lorentzian connections (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 1883-1885 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Fibers of the exterior bundle over a Lorentzian manifold can be given the structure of a Clifford algebra. The minimal left ideals of this Clifford algebra may be interpreted as spinors. In order to better understand spinorial properties of the Kähler equation in a curved space-time, conditions for the Lorentzian connection to preserve these ideals are examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527451
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  • 3
    Electronic Resource
    Electronic Resource
    Rheological study of a gel-forming precursor for superconducting YBa2Cu3O7−x (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 700-702 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Rheological measurements are used to monitor the sol-gel behavior of a superconducting precursor. A precursor made with an aged yttrium component [Y(OH)3] has a much higher elastic modulus (G') and complex viscosity (η*) but the same loss modulus (G‘) compared to that made with a fresher yttrium solution. The G‘/G' ratio is less than unity for the older solution but greater than 1 for the fresher sample, indicating that the former solution has a more gel-like character. The high viscosity sample gives better fired thick-film superconducting properties but has a shorter shelf life. Measurements on yttrium components of different age show differences in viscosity and G‘/G' which correlate with the behavior of the oxide precursors. Reshearing the precursor solution at any stage during its gelation process can cause irreversible changes in the gel structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100645
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Sodium on the Adsorption of SO2 on Al2O3 and on Its Reaction with H2S (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 4620-4625 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100013a036
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  • 5
    Electronic Resource
    Electronic Resource
    Composite Polymer Electrolytes Using Fumed Silica Fillers: Rheology and Ionic Conductivity (1994)
    s.l. : American Chemical Society
    Chemistry of materials 6 (1994), S. 2359-2363 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00048a023
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  • 6
    Electronic Resource
    Electronic Resource
    Linear instabilities in two-dimensional compressible mixing layers (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 957-966 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Linear instability waves in supersonic shear layers are analyzed. Both viscous and inviscid disturbances are considered. The basic state is obtained by solving the compressible laminar boundary-layer equations or is specified by the hyperbolic tangent profile. The effects of the velocity ratio and temperature ratio are determined. The numerical results show that the maximum growth rate depends nonlinearly on the velocity ratio. The results also substantiate the convective Mach number as a compressibility parameter for mixing layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857407
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of a bulge on the subharmonic instability of boundary layers (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 937-948 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of a two-dimensional hump on the three-dimensional (3-D) subharmonic secondary instability on a flat plate is investigated. The mean flow is calculated by using interacting boundary layers, thereby accounting for the viscid/inviscid interaction. The primary wave is taken in the form of a two-dimensional (2-D) Tollmien–Schlichting (T–S) wave. The secondary wave is taken in the form of a 3-D subharmonic wave. The results show that increasing the hump height results in an increase in the amplification factors of the primary and subharmonic waves. When the hump causes separation, the growth rates of both the primary and subharmonic waves are considerably larger than those obtained in the case of no separation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857654
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  • 8
    Electronic Resource
    Electronic Resource
    The nonlinear development of supersonic instability waves in a mixing layer (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 553-566 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear development of two-dimensional supersonic instability waves in a mixing layer is investigated by solving the full unsteady Navier–Stokes equations. A finite-difference predictor–corrector explicit method is used. The method is second-order accurate in time and fourth-order accurate in space. The results have also been checked using a fourth-order central-difference scheme with a Runge–Kutta time marching. Both confined and unconfined shear layers are simulated. For a fast or a slow mode of instability, in which the flow relative to the wave is subsonic on one side of the shear layer and supersonic on the other side, rolled up vortical structures are observed on the subsonic side only. The development of these structures is enhanced by confining the layer between parallel walls. Contours of a passive scalar show that the core of the rolled up vortex contains fluid predominantly from the subsonic side. Oblique shock waves develop in the side where the relative flow is supersonic. In the unconfined case, shock waves form in the far field as a result of the coalescence of compression waves initiated at the deforming shear layer. In the confined shear layer case, they appear as reflections of compression waves off the side wall. In the case of supersonic relative Mach numbers on both sides of the layer, no vortical roll-up is observed; only a staggered pattern of oblique shock waves is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858327
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of bulges on the stability of boundary layers (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 796-806 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The instability of flows around hump and dip imperfections is investigated. The mean flow is calculated using interacting boundary layers, thereby accounting for viscous/inviscid interaction and separation bubbles. Then, the two-dimensional linear stability of this flow is analyzed, and the amplification factors are computed. Results are obtained for several height/width ratios and locations. The theoretical results have been used to correlate the experimental results of Walker and Greening (British Aeronautical Research Council 5950, 1942). The observed transition locations are found to correspond to amplification factors varying between 7.4 and 10.0, consistent with previous results for flat plates. The method accounts for both viscous and shear-layer instabilities. Separation is found to increase significantly the amplification factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866815
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  • 10
    Electronic Resource
    Electronic Resource
    The three-dimensional interaction of a vortex pair with a wall (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 9 (1997), S. 2967-2980 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The interaction of vortices passing near a solid surface has been examined using direct numerical simulation. The configuration studied is a counter-rotating vortex pair approaching a wall in an otherwise quiescent fluid. The focus of these simulations is on the three-dimensional effects, of which little is known. To the authors' knowledge, this is the first three-dimensional simulation that lends support to the short-wavelength instability of the secondary vortex. It has been shown how this Crow-type instability leads to three dimensionality after the rebound of a vortex pair. The growth of the instability of the secondary vortex in the presence of the stronger primary vortex leads to the turning and intense stretching of the secondary vortex. As the instability grows the secondary vortex is bent, stretched, and wrapped around the stronger primary. During this process reconnection was observed between the two secondary vortices. Reconnection also begins between the primary and secondary vortices but the weaker secondary vortex dissipates before the primary, leaving reconnection incomplete. Evidence is presented for a new type of energy cascade based on the short-wavelength instability and the formation of continual smaller vortices at the wall. Ultimately the secondary vortex is destroyed by stretching and dissipation leaving the primary vortex with a permanently distorted shape but relatively unaffected strength compared to an isolated vortex. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869408
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