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  • 1
    Electronic Resource
    Electronic Resource
    In-beam spectroscopy at the RITU gas-filled recoil separator (2003)
    Springer
    The European physical journal 20 (2003), S. 87-92 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. In recent years (1996-2001) the recoil-decay tagging technique has been employed with great success at the Department of Physics of the University of Jyväskylä. Various arrays of germanium detectors have been coupled to the RITU gas-filled separator in order to study nuclei far from stability. An overview of the physics studied with these arrays, along with discussion of technical development of the RITU separator, is presented. Even with a comparatively modest array of germanium detectors it has been possible to study nuclei produced with cross-sections as low as 200 nb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/i2002-10327-x
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  • 2
    Electronic Resource
    Electronic Resource
    Pore structure of bulk tungsten carbide powder catalysts (1995)
    Springer
    Catalysis letters 33 (1995), S. 165-173 
    Details
    ISSN: 1572-879X
    Keywords: tungsten carbide ; porous structure ; microporosity ; hydrogen oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Bulk tungsten carbide catalysts are prepared by direct carburization/reduction of tungsten trioxide in methane-hydrogen mixtures. The catalytic properties of such catalysts have been studied by several authors. The porous structure of these catalysts is studied by adsorption of N2, Kr, CF4 and neohexane. Adsorption isotherms and hysteresis loops for the catalysts suggest the presence of a microporous structure made of parallel plates distant approximately by 20 Å. These results are compared to those obtained using such catalysts for hydrogen oxidation and where condensation in the porous structure was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00817056
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  • 3
    Electronic Resource
    Electronic Resource
    Study of the preparation of bulk tungsten carbide catalysts with C2H6/H2 and C2H4/H2 carburizing mixtures (1997)
    Springer
    Catalysis letters 44 (1997), S. 229-239 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The influence of the preparation procedure of tungsten carbide on the mechanism of carburization is discussed. This work is focused on the reduction and the carburization of tungsten trioxide by a mixture of hydrocarbon and H2 to form WC. Temperature-programmed reaction spectra obtained with CH4, C2H6 and C2H4 have been measured. In presence of the CH4-H2 mixture, H2 is the reducing agent and the hydrocarbon is consumed for the carburization whereas C2H6 or C2H4 participates in the reduction of the tungsten oxide. The temperatures of reduction and carburization are lower by about 150 K using C2H6 or C2H4 instead of CH4. Such a decrease of the temperature of reduction of tungsten oxide is needed to avoid the formation of poorly reducible compounds that can occur during the preparation of supported tungsten carbide. Furthermore, the surface area of the resulting carbide is 25 m2/g with C2H6 and C2H4 and 10 m2/g with CH4. During the carburization, the deposit of excess carbon on the WC surface is larger with the C2 hydrocarbons than with CH4, but it protects the carbide and can be removed by hydrogen treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018985227289
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  • 4
    Electronic Resource
    Electronic Resource
    Localisation of lunar acoustic energy (1970)
    Springer
    Earth, moon and planets 1 (1970), S. 449-450 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00561915
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  • 5
    Electronic Resource
    Electronic Resource
    Infrared observations of the moon and their interpretation (1972)
    Springer
    Earth, moon and planets 5 (1972), S. 16-30 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The lunar spectrum, resulting from both the directly scattered solar radiation and the Moon's intrinsic thermal radiation, is described. The variations of the thermal component with latitude and phase, and during eclipse conditions, are described and compared with a plane homogeneous model of temperature-independent thermal constants. A review is given of that data appropriate to the lunar crust which may be obtained, both from comparison of this model with observation and from those modifications of the model, which explain otherwise anomalous measurements. Finally, a discussion of the various methods of determining the vertical temperature gradient at the surface leads to a mean value of about 2Km−1, although the heat flux associated with these results is much less than the recent direct measurement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00562102
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  • 6
    Electronic Resource
    Electronic Resource
    The origin of the shapes of lunar globules (1979)
    Springer
    Earth, moon and planets 21 (1979), S. 283-288 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract This paper considers three hypotheses for the origin of the shapes of the regular elongated prolate and dumbbell-shaped lunar glass globules. These are the break-up of a jet, the vibration-freezing hypothesis and the rotational hypothesis. It is concluded that there are many results favouring the latter hypothesis so that its validity now appears conclusive. Applications of the hypothesis as a tool in lunar science are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00897356
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  • 7
    Electronic Resource
    Electronic Resource
    Planetary relaxation with spatially- and temporarily-dependent viscosity (1983)
    Springer
    Earth, moon and planets 28 (1983), S. 1-9 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract This paper examines the relaxation of planetary surface features in the size range from one to several hundred kilometers. For this purpose a new type of computational method is used. This involves the assumption of axial symmetry and supposes also that motion takes place in a vertical direction only. Although this later assumption may seem restrictive, comparison with results computed by other techniques show that it produces relatively exact results. Furthermore, the method may be easily applied to a wide variety of situations in which for example the viscosity is a function of position time, shear-gradient, and even previous history, as well as cases in which inertial terms are important. In this paper the results of applying the method to two particular problems are briefly described — relaxation under a highly depth-dependent viscosity condition, and the relaxation of lunar mascons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01371665
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal instabilities and the formation of lunar maria (1973)
    Springer
    Earth, moon and planets 8 (1973), S. 335-339 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A model is discussed for a possible type of thermal instability in the outer layers of the Moon. An estimate is made for the temperature differential driving the instability. It is suggested that such an instability may have been involved in the formation of the lunar maria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00581727
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  • 9
    Electronic Resource
    Electronic Resource
    Note on the rings of Saturn (1981)
    Springer
    Earth, moon and planets 24 (1981), S. 467-467 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896913
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  • 10
    Electronic Resource
    Electronic Resource
    A new theory for the formation of the maria and cayley type lunar regions (1974)
    Springer
    Earth, moon and planets 10 (1974), S. 143-162 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A new ‘liquefaction’ theory for the origin of the flat marial and Cayley areas on the lunar surface is described. It is supposed that the flat terrain in these areas resulted from periods in the development of the Moon when these regions, although not liquid, had a sufficiently low viscosity for the surfaces to relax more or less completely to a level form. To account for this low viscosity a model is developed in which, within these regions and for relatively short periods in the early history of the Moon, preferentially high temperatures were maintained close to the lunar surface. The paper examines in some detail the possibility that these high temperatures may have resulted from instabilities in the lunar heat flow pattern caused by the presence of a surface layer of very low thermal conductivity produced by the debris of early meteorite impacts. A comparison is made between current models for the formation of the lunar surface and the theory here proposed: the advantages of the latter are enumerated and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655716
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