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  • 11
    Electronic Resource
    Electronic Resource
    Thermal evolution and differentiation of a short-period comet
    Amsterdam : Elsevier
    Planetary and Space Science 41 (1993), S. 409-427 
    Details
    ISSN: 0032-0633
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0032-0633(93)90001-I
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  • 12
    Electronic Resource
    Electronic Resource
    Multivariate classification methods in planetary sciences (1992)
    Springer
    Earth, moon and planets 59 (1992), S. 141-152 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract In this paper the problem of the classification of natural samples is discussed. An updated version of the G-mode multivariate statistical method for the classification of natural samples, applicable to a wide range of research fields, is discussed in this paper. This method allows an automatic classification in terms of homogeneous taxonomic units, without any a priori knowledge of the taxonomic structure of the natural observations; it provides informations on the different levels of classification present in the data set under study (classes and subclasses), on the level of information residing in each variable, on the level of similarity and/or difference among homogeneous classes. An earlier version of this method has been widely applied in planetary sciences, astrophysics and geological sciences. The authors give here a resumé of the most interesting results obtained in these different research fields, from the geochemistry of lunar samples to asteroids taxonomy to remote sensing of planetary surfaces. This method is extremely reliable and versatile, and it is suggested that its use be widespread whenever the problem of the classification of a large set of natural samples occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00058728
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  • 13
    Electronic Resource
    Electronic Resource
    Release of volatiles from a possible cryovolcano from near-infrared imaging of Titan (2005)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 435 (2005), S. 786-789 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Titan is the only satellite in our Solar System with a dense atmosphere. The surface pressure is 1.5 bar (ref. 1) and, similar to the Earth, N2 is the main component of the atmosphere. Methane is the second most important component, but it is photodissociated on a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature03596
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  • 14
    Electronic Resource
    Electronic Resource
    Compositional maps of Saturn's moon Phoebe from imaging spectroscopy (2005)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 435 (2005), S. 66-69 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The origin of Phoebe, which is the outermost large satellite of Saturn, is of particular interest because its inclined, retrograde orbit suggests that it was gravitationally captured by Saturn, having accreted outside the region of the solar nebula in which Saturn formed. By contrast, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature03558
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  • 15
    Electronic Resource
    Electronic Resource
    Modelling of surface ground deformations in the Phlegraean Fields volcanic area, Italy (1984)
    Springer
    Bulletin of volcanology 47 (1984), S. 321-330 
    Details
    ISSN: 1432-0819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A preliminary finite elements model of the ground deformations observed at Phlegraean Fields is proposed. The model assumes an oblate-spheroid magma chamber at the depth of 5.4 km with major semiaxis of 1.5 km and minor semiaxis of 0.75 km. The dimensions of the magma chamber have been evaluated by using a thermal model based on the assumptions that a progressively cooling huge magmatic body is responsible for the volcanic activity at Phlegraean Fields in the last 35,000 years. Surface deformations caused by an over-pressure of 30 MPa in the magma chamber have been calculated. Constant, and temperature-dependent elastic parameters of the surrounding medium have been considered. Vertical displacements of the order of those presently observed at Phlegraean Fields can be obtained only with temperature-dependent elastic properties of the medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01961563
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  • 16
    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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  • 17
    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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  • 18
    Electronic Resource
    Electronic Resource
    Time evolution of grains in the protosolar nebula (1980)
    Springer
    Earth, moon and planets 22 (1980), S. 47-61 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The problem of the motion of grains in the protosolar nebula is discussed. Time scales of the vertical and radial displacement are computed. The structure of the dust disk that can be formed is discussed in the framework of different protosolar nebula models. The results obtained under the hypothesis of quiescience of the gas component are compared with those in presence of a fully developed turbulence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896866
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  • 19
    Electronic Resource
    Electronic Resource
    A Moon orbiting observatory for the measurement of the elemental and isotopic composition in the primary cosmic radiation (1994)
    Springer
    Astrophysics and space science 220 (1994), S. 131-147 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We describe a project for the measurement of elemental composition of the primary cosmic radiation to be performed by a space observatory orbiting around the Moon. The absence of atmosphere and the low intrinsic magnetic field of the Moon give access to the very low energy component of the cosmic radiation, allowing the search for rare events. The quest for antinuclei, the determination of the lunar lepton albedo and the abundance measurement of galactic radioactive clocks (Be10, C14, Al26) are the major tasks of the ANTARES apparatus (ANTimatter Assessment RESearch). We report details of the instrument design, the expected performance for single detectors, their capability to accomplish the proposed measurements and the characteristics of the space mission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00628083
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  • 20
    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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