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  • 1980-1984  (8)
  • 1975-1979  (3)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Contributions to mineralogy and petrology 87 (1984), S. 65-71 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract In the metamorphosed manganese oxide ores of India, braunite is ubiquitous in all assemblages from chlorite to sillimanite grades. Chemical analyses of braunite from different prograde assemblages confirm the presence of a fixed R2+ (=Mn2++Mg+Ca) SiO3 molecule in the mineral. Element partitioning between coexisting braunite and bixbyite indicates a near-ideal mixing of Fe+3/ -Mn+3 in the phases. This also indicates that braunite became relatively ferrian while equilibrating with associated phases such as bixbyite, hollandite and jacobsite during prograde reactions. Petrogenetic studies show that as a general trend, prograde lower oxide phases appeared by deoxidation of higher oxide phases. But braunite, a more reduced phase than bixbyite, appeared early from deoxidation of pyrolusite in presence of quartz. Bixbyite could appear later from the reacting pyrolusite-braunite-quartz assemblage. Inferred mineral reaction paths and the general trend of pro-grade deoxidation reactions suggest that the composition of ambient fluid phase was internally buffered during metamorphism.
    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
    Springer
    Journal of low temperature physics 51 (1983), S. 265-278 
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The problem of spin diffusion in normal liquid3He in the presence of precessional effects is reexamined taking into account the energy dependence of the quasiparticle relaxation time. This leads to a generalization of Leggett's relation for the successive height of the echoes in a φ-180°-180° experiment. Reanalyzing the experiment of Corruccini et al. (including finite-temperature corrections) leads to almost exact and model-independent values for F 1 a and λD.
    Type of Medium: Electronic Resource
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 37 (1979), S. 379-387 
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have developed a theory, valid for arbitrary frequencies, to calculate the change in the velocity and damping of sound due to fluctuations of the order parameter just above the superfluid transition temperature in liquid 3He. While the theory is approximate, it gives the exact high-frequency limit and is off the exact low-frequency limit by less than 0.5%. We show that careful measurements on the frequency dependence of the fluctuation contribution should allow one to obtain information on the nature of quasiparticle interactions in the normal liquid.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 23 (1976), S. 225-230 
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: We discuss transport and relaxation processes in an anisotropic superfluid close to the transition temperature by deriving the quasiparticle Boltzmann equation. As an application we calculate the shear viscosity of liquid 3He exactly to first order in the superfluid gap, in terms of normal state properties. Exact results for the transport coefficients and relaxation rates in the super-fluid enable one to extract precise information about normal state scattering amplitudes from measurements in the superfluid phases.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Flow, turbulence and combustion 36 (1980), S. 197-212 
    ISSN: 1573-1987
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The axi-symmetric laminar boundary layers, formed on the conical surface and under the cyclone roof, have been calculated by Pohlhausen's method assuming that the tangential velocity outside boundary layers varies as r −n up to the point where boundary layers meet solid body rotating liquid column and thereafter as r—as found in experiments—where r is the distance from the axis of the cone and n is flow pattern constant. Point of interaction of the boundary layers with solid body rotating liquid column has been taken from experimental results obtained with a hydrocyclone having vortex finder diameter greater than that of apex opening. Results show that there is no possibility of separation of boundary layers from cyclone wall.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Flow, turbulence and combustion 36 (1980), S. 213-225 
    ISSN: 1573-1987
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract As in the laminar case (see previous paper), the axi-symmetric turbulent boundary layers have been studied inside a hydrocyclone having overflow diameter greater than that of underflow. This type of hydrocyclone is generally used in practical applications. Calculating total flux through the boundary layers, formed on the conical surface and under the roof of the hydrocyclone, a mathematical model of the flow field has been obtained which agrees very well with previous experimental findings.
    Type of Medium: Electronic Resource
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 14 (1982), S. 1219-1229 
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Kinetic investigations on the reaction between U(IV) and H2O2 have been carried out at different acidities in chloride medium at an ionic strength of 2M. The observed bimolecular rate constant has been found to be dependant on [H+]-1.3. The activation energy of the overall reaction has been found to vary from 13.4 ± 0.7 to 18.0 ± 0.8 kcal/mol in the range of acidity from 0.3 to 1.5M. The results have been explained on the basis of three parallel rate-controlling reactions involving unhydrolyzed species of U(IV) and hydrolyzed species UCl(OH)2+ and UO2+. The values of the rate constants for these three reaction paths have been found to be of the order of 3.95, 5.59 × 103, and 1.49 × 105M-1 min-1, respectively.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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