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  • 1
    Digitale Medien
    Digitale Medien
    Crystal structure of 5,5-dimethyl-2-p-bromophenylimino-Δ3-1,3,4-oxadiazoline (1973)
    Springer
    Journal of chemical crystallography 3 (1973), S. 71-78 
    Details
    ISSN: 1572-8854
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract Oxidation of acetone-4-p-bromophenylsemicarbazone with lead tetraacetate yields only one isomer of 5,5-dimethyl-2-p-bromophenylimino-Δ3-1,3,4-oxadiazoline, C10H10BrN3O. Crystals of this compound are triclinic, space groupP¯1,a = 5·91(1),b = 9·52(1),c = 11·59(2) Å, α =114·1(1) °, β = 93·5(1) ° and γ = 108·8(1) °;z = 2 and the chemical composition is C10H10BrN3O. Of 2306 independent reflexions examined, 877 were strong enough to be measured with integrated precession photographs using MoKα radiation. The structure was refined using a full-matrix least-squares program to a finalR value of 0·064. The structure consists of planar phenyl and oxadiazoline rings, with a van der Waals interaction between a phenyl hydrogen atom and oxygen atom of the five member ring preventing the two rings from being co-planar; the H(13)-O(1) separation is 2·47 Å. TheZ-configuration of the product suggests a specific mechanism for the ring closure involving an organolead intermediate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01237429
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  • 2
    Digitale Medien
    Digitale Medien
    Possible influence of comets on the chemical evolution of the galaxy (1974)
    Springer
    Astrophysics and space science 31 (1974), S. 31-35 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract It has been suggested by Cameron that a cloud of comets containing a mass of condensable elements, comparable to the mass of such elements in the sun, formed on the outskirts of the solar system. If the formation of such comet clouds is a general feature of star formation, they constitute a significant sink of elements heavier than helium. It is shown here that this process provides a possible explanation for the very slow rate at which the mean metal abundance of disk stars has increased during the lifetime of the Galaxy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00642598
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  • 3
    Digitale Medien
    Digitale Medien
    Electron capture in carbon dwarf supernovae (1974)
    Springer
    Astrophysics and space science 27 (1974), S. 261-291 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The rates of electron capture on heavier elements under the extreme conditions predicted for dwarf star supernovae have been computed, incorporating modifications that seem to be indicated by present experimental results. An estimate of the maximum possible value of such rates is also given. The distribution of nuclei in nuclear statistical equilibrium has been calculated for the range of expected supernovae conditions, including the effects of the temperature dependence of nuclear partition functions. These nuclide abundance distributions are then used to compute nuclear equilibrium thermodynamic properties. The effects of the electron capture on such equilibrium matter are discussed. The results of supernova numerical hydrodynamics incorporating the computed equilibrium properties and the influence of electron capture are presented. In the context of the ‘carbon detonation’ supernova model, the dwarf central density required to assure core collapse to a neutron star configuration is found to be slightly higher than that obtained by Bruenn (1972) with the electron capture rates of Hansen (1966).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00643877
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  • 4
    Digitale Medien
    Digitale Medien
    Neutron star models based on an improved equation of state (1970)
    Springer
    Astrophysics and space science 6 (1970), S. 228-239 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Using an equation of state for cold degenerate matter which takes nuclear forces and nuclear clustering into account, neutron star models are constructed. Stable models were obtained in the mass range above 0.065M ⊙ and density range 1014.08 to 1015.4 gm/cm3. All of these models were found to be bound. The outer crystalline layer of the star was found to have a thickness of 200 m or more depending on the mass of the model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00651224
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  • 5
    Digitale Medien
    Digitale Medien
    URCA shells in dense stellar interiors (1970)
    Springer
    Astrophysics and space science 7 (1970), S. 374-406 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Thermal and vibrational energy losses due to URCA shells in stellar interiors are calculated. Analytic expressions are derived for semidegenerate, relativistic electrons. Results are given for more general cases calculated with a computer. The calculations are carried out for a large number of nuclei that may contribute to URCA energy losses in various stages of stellar evolution. An illustration is given of the cooling and vibrational damping of a white dwarf. For a central Fermi energy ≳5 MeV, the internal temperature of the star should be reduced to the order of 106 K and the relative vibrational amplitude should be reduced to the order of 10−5 on a time scale of 109 yr. URCA shells are present, the URCA neutrino energy loss dominates in the temperature region up to about 2×109 K.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00653278
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  • 6
    Digitale Medien
    Digitale Medien
    Primitive groups with most suborbits doubly transitive (1973)
    Springer
    Geometriae dedicata 1 (1973), S. 434-446 
    Details
    ISSN: 1572-9168
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00184629
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  • 7
    Digitale Medien
    Digitale Medien
    Near-regularity conditions for designs (1973)
    Springer
    Geometriae dedicata 2 (1973), S. 213-223 
    Details
    ISSN: 1572-9168
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00147860
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  • 8
    Digitale Medien
    Digitale Medien
    Locally symmetric designs (1974)
    Springer
    Geometriae dedicata 3 (1974), S. 65-76 
    Details
    ISSN: 1572-9168
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00181362
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  • 9
    Digitale Medien
    Digitale Medien
    Neutron star models including the effects of hyperon formation (1971)
    Springer
    Astrophysics and space science 10 (1971), S. 227-245 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A new series of neutron star models has been computed. The equation of state used included the effects of nuclear dissolution, nuclear forces, and the presence of hyperons. The nuclear forces were introduced through use of a generalized form of the Levinger-SimmonsV α andV γ potentials. The maximum stable masses obtained were 2.28 and 2.37M ⊙, respectively. Details are given of the structure of the outer layers which are expected to be crystalline. Expressions are given for the angular momentum and rotational energy of a neutron star and the relevant moment of inertia is tabulated for the models.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00704084
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  • 10
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    Unbekannt
    THE UNBOUND PROMETHEUS: A REVIEW ARTICLE (1970)
    New York : Periodicals Archive Online (PAO)
    Explorations in economic history. 8:2 (1970/1971:Winter) 229 
    Details
    ISSN: 0014-4983
    Thema: Geschichte , Wirtschaftswissenschaften
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:6432-1970-008-02-000008
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