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  • Springer  (642)
  • American Geophysical Union (AGU)
  • 1975-1979  (642)
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Year
  • 1
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    Unknown
    Abstracts (1977)
    Springer
    Details
    Publication Date: 1977-01-01
    Print ISSN: 0364-152X
    Electronic ISSN: 1432-1009
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    A subgradient algorithm for certain minimax and minisum problems (1978)
    Springer
    Mathematical programming 15 (1978), S. 130-145 
    Details
    ISSN: 1436-4646
    Keywords: Minimax Problems ; Minisum Problems ; Nondifferentiable Optimization ; Subgradients ; Location Problems ; Linear Approximation Problems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract We present a subgradient algorithm for minimizing the maximum of a finite collection of functions. It is assumed that each function is the sum of a finite collection of basic convex functions and that the number of different subgradient sets associated with nondifferentiable points of each basic function is finite on any bounded set. Problems belonging to this class include the linear approximation problem and both the minimax and minisum problems of location theory. Convergence of the algorithm to an epsilon-optimal solution is proven and its effectiveness is demonstrated by solving a number of location problems and linear approximation problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01609012
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Food utilization in the fishTilapia mossambica fed on plant and animal foods (1976)
    Springer
    Helgoland marine research 28 (1976), S. 66-70 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary 1. When fed rations ranging from 4 to 29 mg (dry)Spirogyra maxima/g live fish/day, absorption efficiency ofTilapia mossambica increased from 50 to 78%; the youngT. mossambica could not consume and utilize sufficient algae to meet its metabolic energy requirement. 2. On supplementing the algal food with goat liver, the fish consumed not only more food (38 mg/g/day) but also enhanced the absorption efficiency to 94%. 3. Given only the liver pieces, the fish consumed 47 mg-g-day; it displayed 95 and 30% of absorption and conversion efficiencies. However, the fish preyed upon and could consume only 41 mg tadpoles/g/day and convert with 26% (K2) efficiency.
    Notes: Kurzfassung Die Nahrungsausnutzung des herbivoren FischesTilapia mossambica wurde bei unterschiedlichem Futterangebot untersucht. Als Nahrung dienten die GrünalgeSpirogyra maxima, Ziegenleber und lebende Kaulquappen. Mit Algennahrung allein konnten Jungfische ihren Energiebedarf nicht decken. Wurde darüber hinaus Ziegenleber verfüttert, so erhöhte sich sowohl die aufgenommene Nahrungsmenge als auch die Nahrungsausnutzung. Maximale Konversionsraten wurden bei ausschließlich tierischer Kost erzielt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01610797
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  • 4
    Electronic Resource
    Electronic Resource
    On the effects of antimony and glue on zinc electrocrystallization behaviour (1976)
    Springer
    Journal of applied electrochemistry 6 (1976), S. 1-7 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract An investigation has been made to determine the effects that additions of glue and antimony have on the electrowinning of zinc from acid sulphate solutions. In particular, the zinc crystal growth and cathode current efficiencies were studied in an attempt to establish a correlation between morphology and the nature of the additives. Operating conditions of 55 A ft−2#x002A; and 35°C were used for most of the experiments with electrolyte concentrations of approximately 55 gl−1 zinc and 150 gl−1 H2SO4. Additional runs were made at 40,75 and 100 Aft−2 at 30,40 and 50°C in order to verify certain trends. Primarily by means of scanning electron microscopy (SEM) techniques, it was possible to categorize deposit morphologies according to the type and concentration of the additives. The general effect of antimony was to refine the grain size and cause the basal plane platelets to lie parallel to the substrate. Glue also caused some refinement, but caused the platelets to become aligned perpendicular to the substrate. Level deposits were obtained in the latter case, which would effectively prevent dendritic growths. A relationship between the relative amounts of glue and antimony in solution and the current efficiency was also obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01058863
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  • 5
    Electronic Resource
    Electronic Resource
    Anodic dissolution of galena concentrate in perchloric acid (1978)
    Springer
    Journal of applied electrochemistry 8 (1978), S. 25-32 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A basic study has been made on the anodic dissolution of lead sulphide ore (galena) in perchloric acid. The electrodes used in the research were fabricated by melting and casting the ore in a suitable mould. The phases which were present in sufficient quantities to be detected by X-ray diffraction were PbS and ZnS. Coulombic efficiencies were determined at 40° C at various levels of pH and current density, and were in the range of 90% for most of the tests. Transient studies revealed a non-uniform surface attack and that the dissolution reaction was irreversible, as indicated by the absence of cathodic currents, in the vicinity of the rest potential. Steady-state studies showed the reaction to be activation controlled and that the rate-determining step was a chemical reaction following the first electron transfer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615390
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of antimony, chloride ion, and glue on copper electrorefining (1978)
    Springer
    Journal of applied electrochemistry 8 (1978), S. 109-119 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A study has been made to determine the effect of antimony, chloride ion, and glue on copper electrorefining. All deposits were made at a temperature of 65° C on a titanium cathode. Current densities of 398 A m−2 and 133 A m−2 were used. The deposits were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD) to determine morphology and crystal orientation. Atomic absorption (AA) and Auger spectroscopy (AES) were used to study the chemical composition of the deposits and a simple bend test was used to determine structural integrity. It was found that when the antimony concentration in the electrolyte exceeded 300 ppm, brittle deposits were produced containing considerable amounts of antimony. Very small amounts of chloride ion (1.5 ppm or above) decreased the codeposition of antimony greatly and produced ductile deposits. However, at a chloride ion level of 15 ppm or above, the back side of the deposit had a very rough, powdery appearance. The effect of glue was to counteract this and to produce a mirror-like finish on the deposit back.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617669
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  • 7
    Electronic Resource
    Electronic Resource
    On the rotation of Mercury (1979)
    Springer
    Celestial mechanics and dynamical astronomy 19 (1979), S. 297-313 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A planar, fixed-orbit model of the rotation of the planet Mercury is analyzed. The model includes only the solar torques on the planet's permanent asymmetry and its solar tidal bulge. For this model, it is shown that the zero of the averaged tidal torque corresponds to an asymptotically stable periodic solution of the second kind which, for two tidal torque representations, is close to the asymptotically stable equilibrium point corresponding to an exact 3∶2 spin-orbit resonance. A conjecture that the current rotation state of Mercury is due to transfer from capture by the zero of the averaged tidal torque to 3∶2 resonance capture with changes in the eccentricity of the planet's orbit is discussed briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01230222
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  • 8
    Electronic Resource
    Electronic Resource
    Book reviews (1979)
    Springer
    Computers and the humanities 13 (1979), S. 311-333 
    Details
    ISSN: 1572-8412
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Media Resources and Communication Sciences, Journalism
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02400144
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  • 9
    Electronic Resource
    Electronic Resource
    Giant grains? (1976)
    Springer
    Astrophysics and space science 45 (1976), S. 467-476 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Infrared observations of the Orion nebula have been interpreted by Rowan-Robinson (1975) to imply the existence of ‘giant’ grains, radius ∼10−2 cm, throughout a volume about a parsec in diameter. Although Rowan-Robinson's model of the nebula has been criticized (e.g., Andriesse, 1976) and the presence of such grains in Orion is disputed, we accept,pro tem, the proposition that they exist, and examine in this paper situations in which giant grains could arise. We find that, while a giant-grain component to the interstellar grain density may exist, it is difficult to understand how giant grains arise to the extent apparently required by the Orion nebula model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642680
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  • 10
    Electronic Resource
    Electronic Resource
    Large interstellar molecules (1977)
    Springer
    Astrophysics and space science 48 (1977), S. 243-248 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We propose that photocycloaddition reactions in molecular complexes in normal interstellar clouds will create unusually large molecules. These may be sufficiently radiation stable to be circulated with the interstellar gas, and so provide convenient nucleation centres for growth of loosely bound grains in dark regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648113
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