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  • Springer  (13)
  • Nature Publishing Group  (8)
  • American Association for the Advancement of Science (AAAS)  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Rotating lunar globules (1980)
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 108-108 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SEVERAL theories have been proposed for the origin of the shapes of lunar dumbbell and ellipsoidal glass globules. The rotational theory1 assumes that they solidify while rotating in free fall above the lunar surface, the rotation giving the elongation in form. A second theory imagines ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/283108a0
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  • 2
    Electronic Resource
    Electronic Resource
    Continuous Spectrum of Taurus A at 1.2 mm Wavelength (1969)
    [s.l.] : Nature Publishing Group
    Nature 221 (1969), S. 944-945 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The optical quality of the telescope was used for a preliminary determination of the pointing accuracy of the infrared system to within 1' of arc during a brief cloud-free interlude, but the observations themselves were made on the night of November 30December 1 through cloud, relying on the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/221944a0
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  • 3
    Electronic Resource
    Electronic Resource
    A Corrugated Model for the Lunar Surface (1962)
    [s.l.] : Nature Publishing Group
    Nature 196 (1962), S. 1305-1305 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 It is clear from radiation considerations that during an eclipse the temperature 2\ of the bases of the indentations of our model vary very much less than will the temperature T2 of the upper surfaces. Eclipse measurements1'2 show a greater variation of effective temperature for regions ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1961305a0
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  • 4
    Electronic Resource
    Electronic Resource
    Interpretation of Cosmology (1960)
    [s.l.] : Nature Publishing Group
    Nature 188 (1960), S. 923-924 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Gravitational formulations of Mach's Principle4 5 assume that the dynamical properties of a body are due to the gravitational interaction of the body with the matter composing the rest of the universe. The resulting gravitational potential of the body becomes a function of its velocity, so that the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/188923a0
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  • 5
    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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  • 6
    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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  • 7
    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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  • 8
    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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  • 9
    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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  • 10
    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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