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  • 1980-1984  (3)
  • 1975-1979
  • 1981  (3)
Material
Years
  • 1980-1984  (3)
  • 1975-1979
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 43 (1981), S. 17-24 
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: The contribution to the specific heat due to order parameter fluctuations in liquid 3He just above the superfluid transition temperature T c is calculated exactly within a Landau theory approach. The effect turns out to be unobservably small and thus cannot explain the large (∼9%) rise in specific heat above the normal state value at the saturated vapor pressure in a recently reported experiment. We do not find the divergence of the specific heat at T cobtained earlier by Thouless from a microscopic calculation and indicate how the difference can be reconciled.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1619-6937
    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 Es wird die instationäre, laminare Bewegung eines elektrisch leitenden, viskosen, inkompressiblen, staubhaltigen Fluids zwischen zwei unendlich ausgedehnten, nichtleitenden, parallelen Platten unter einem einheitlichen Quermagnetfeld, welches relativ zum Fluid festgehalten wird, behandelt. Die untere und die obere Platte werden stoßartig aus der Ruhe beschleunigt und bewegen sich anschließend mit gleichförmigen, aber unterschiedlichen, Geschwindigkeiten. Es werden die Geschwindigkeiten für das leitende, staubhaltige Fluid und die nichtleitenden Staubpartikel in Abhängigkeit dreier dimensionsloser Parameter, der Konzentrationl, des Relaxationsparameters σ und der HartmannzahlM erhalten. Die Ausdrücke für den Durchsatz pro Breiteneinheit der Platte und die Schichtreibung an der unteren Platte werden berechnet. Die numerischen Ergebnisse zeigen, daß mit wachsender Hartmannzahl die Geschwindigkeiten des Gases und der Staubpartikel anwachsen wenn beide Platten in Bewegung sind und die Geschwindigkeit der oberen Platte gleich, größer oder kleiner ist als die der unteren Platte und die gleiche Richtung hat. Im Fall der Couette-Bewegung nehmen sie ab.
    Notes: Summary The unsteady laminar motion of an electrically conducting, viscous and incompressible dusty fluid between two infinitely extended non-conducting parallel plates under a uniform transverse magnetic field, fixed relative to the fluid has been considered. The lower and the upper plate are started impulsively from rest and thereafter move with different but uniform velocities. The velocity fields for the conducting dusty fluid and non-conducting dust particle have been obtained in terms of three non-dimensional parametersl (concentration), σ (relaxation time parameter) andM (Hartmann number). The expressions for the discharge per unit breadth of the plate and the skin-friction at the lower plate are calculated. It is observed, from numerical calculations, that as the Hartmann number increases velocities of the dusty gas and dust particle increase when both the plates are in motion (velocity of the upper plate being equal to, greater than and less than that of the lower plate in the same direction) and decrease in case of Couette motion.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 13 (1981), S. 385-401 
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of the reaction have been investigated in H2SO4 medium under different conditions. The observed bimolecular rate constant kobs, has been found to depend on [H+]-0.55 and to increase with the initial concentration ratio of the reactants R0 = [H2O2]0/[U (IV)]0 above 0.49. The activation energy of the overall reaction has been determined as 13.79 and 14.3 kcal/mol at R0 = 1 and 0.35, respectively. Consistent with experimental data, a detailed reaction mechanism has been proposed where the hydrolytic reaction (4) followed by the rate-controlling reaction (10) and subsequent fast reactions of U (V) and OH radicals are involved: A kinetic expression has been derived from which a graphical evaluation of (kK4)-1 and k-1 has been made at R0 = 1 as (12.30 ± 0.09) × 10-3 M min, (6.23 ± 2.19) × 10-4 M min; and at R0 = 0.35 as (12.63 ± 2.13) × 10-3 M min, (8.32 ± 6.62) × 10-4 M min, respectively. Indications of some participation of a chain reactionat R0 = 1 have been obtained without affecting thesecond-order kinetics as observed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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