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  • 1975-1979  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Grains accretion processes in a proto-planetary nebula (1977)
    Springer
    Astrophysics and space science 48 (1977), S. 79-87 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Some mechanisms which are expected to produce the growth of dust grains in the protosolar nebula are studied during the isothermal and the adiabatic phase of the gravitational collapse. Owing to the low sticking efficiency in the grain-grain collisions and also to the impossibility of gas capture by solid particles in the physical environment considered, the main result is the production in about 106 yr of a set of particles similar in mass. The obtained mass limit (10−8–10−9 g) depends on the physical properties of the grains, and seems to be independent of the turbulence model used for the gas motion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643041
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Grains accretion processes in a protoplanetary nebula: Conducting and insulating materials (1975)
    Springer
    Astrophysics and space science 33 (1975), S. 369-384 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In a previous work the authors estimated cross-sections for constructive and destructive collisions (‘constructive’ and ‘destructive’ cross-sections) related to silica grains embedded in a protoplanetary nebula. The outstanding point of the problem has induced the authors to examine more closely the physical conditions in which the accretion processes occur, and their dependence on the materials, by which the particles are probably made. In this paper the interaction processes among conducting grains (iron, graphite) and among the insulating (silica) ones have been considered. The following results have been obtained: (1) insulating grains have smaller constructive crossections than conducting; and (2) conducting grains show very large cross-sections for masses up to about 10−9 g.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00640106
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Classification of lunar rocks and glasses by a new statistical technique (1976)
    Springer
    Earth, moon and planets 16 (1976), S. 175-190 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Реφерат Применен и описан новый многомерный статистический метод выделения однородных классов объектов. Обсуждаются результаты, полученные при анализе лунных пород и стекол. Лунные породы находятся в следующих генетических соотношениях: пироксенитовый материал и анортозиты являются крайними членами дифференциации пород, высокотитанистые морские базальты, нориты и континентальные базальты занимают среднее положение. Состав стекол отражает состав пород с некоторыми частичными особенностями. Например, гранитный материал присутствует только в стеклах и имеет вероятно остаточное происхождение. Взаимоотношения между выделенными однородными классами пород и стекод обсуждаются с точки зрения эводюции лунной коры
    Notes: Abstract A new multivariate statistical technique have been developed for detection of populations groupings in data arrays. General characteristics of the method are described. Results obtained analyzing lunar rocks and glasses are discussed. Lunar rocks lie in a genetically related sequence: pyroxenitic mantle materials produce mare type basalts; anorthositic rocks are the most distant members of the differentiation; noritic, hi-Ti and high KREEP basalts materials appear to be intermediate products. Lunar glasses parallel the overall behaviour of rocks, with some peculiar local characteristics. Granitic materials are present only as glasses, suggesting an origin as residuals. Links between several identified classes are discussed in terms of the evolution of the lunar crust.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648052
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Grains accretion processes in a protoplanetary nebula: Effects of the presence of liquid drops (1978)
    Springer
    Earth, moon and planets 18 (1978), S. 65-76 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The temporal behaviour of the mass distribution function of iron solid and/or liquid grains is studied in the inner regions of the solar nebula during its gravitational collapse. At distances from the centre of the nebula equal to 0.2 AU, 0.5 AU and 0.7 AU a mass limit for the accretionary process equal, respectively, to 17.6 g, 5.2 g and 3×10−3 g is obtained in a reasonable time interval. The importance of a ‘drop phase’ during the growth of the particles and of the ‘sedimentation’ of the grains during the ‘disk phase’ is underlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896698
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    Paper (German National Licenses)
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