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  • 11
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    Unknown
    In:  Other Sources
    Publication Date: 2019-06-28
    Description: A method based on the use of constrained spline fits is used to overcome the difficulties arising when body-wave data in the form of T-delta are reduced to the tau-p form in the presence of cusps. In comparison with unconstrained spline fits, the method proposed here tends to produce much smoother models which lie approximately in the middle of the bounds produced by the extremal method. The method is noniterative and, therefore, computationally efficient. The method is applied to the lunar seismic data, where at least one triplication is presumed to occur in the P-wave travel-time curve. It is shown, however, that because of an insufficient number of data points for events close to the antipode of the center of the lunar network, the present analysis is not accurate enough to resolve the problem of a possible lunar core.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Seismological Society of America, Bulletin (ISSN 0037-1106); 72; 2147-217
    Format: text
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  • 12
    Publication Date: 1970-12-01
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
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  • 13
    Publication Date: 1961-12-01
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
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  • 14
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 190 (1961), S. 498-500 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE discovery of the Zeeman effect in 1896 came at a time when the basic concepts needed for its interpretation had been worked out by Lorentz1. Already in his first paper2, Zeeman reported a verification of the polarization of the lines, an effect which Lorentz had advised him to look for. He ...
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 4 (1937), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The propagation of Rayleigh waves in the Earth is investigated in the whole range of periods T from about 10s up to one hour. Three methods are necessary in order to cover this range of periods effectively. The standard flat Earth method, with neglect of gravity, gives values for the phase velocity C correct to within I per cent up to T= 50s only, and for the group velocity U up to T= 250s. The method of the flattening of the Earth, with neglect of gravity, has the I per cent accuracy limits for C and U at 300 and 400, respectively. Inclusion of gravity effects in the flattening of the Earth approximation does not alter the above limits. For T 〉 300 (n 〈 25) one must determine the period T(n) of free oscillation of the Earth as a function of the order of the spherical harmonic n. This involves the solution of a system of differential equations of the sixth order, in which the gravitational effects are included. The wave penetrates appreciably into the core already at T= 600. Using the above three methods in their respective ranges of validity, we have evaluated C(T) and U(T) for (I) Bullen's Model B, (2) the Jeffreys-Bullen Model, as modified by Dorman, Ewing and Oliver, and (3) the Gutenberg Model. The observed Rayleigh group velocity data of Ewing and Press for T 〈 380s and the phase velocity data of Nafe and Brune for T 〈 300s agree with the values computed for the Gutenberg model, but not for the other models. This substantiates a previous conclusion reached by Takeuchi, Press and Kobayashi and by Dorman, Ewing and Oliver that the observed Rayleigh wave data provide evidence in support of Gutenberg's lowvelocity layer. The few observed Rayleigh group velocities between T= 400 and 600 are substantially lower than the theoretical values for all the three models.
    Type of Medium: Electronic Resource
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  • 16
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organometallic Compounds of Lanthanides. II. Dicyclopentadienyl(di-tert-butylphosphino)terbium, -holmium, and -erbiumLithium(di-tert-butyl)phosphide reacts with dicyclopentadienylterbium or dicyclopentadienylholmium chloride under elimination of lithium chloride and formation of dicyclopentadienyl(di-tert-butylphosphino)terbium or -holmium, respectively. Dicyclopentadienyl(di-tert-butyl-phosphino)erbium is formed by the reaction of dicyclopentadienylerbium chloride with di-tert-butyl-(trimethylsilyl)-phosphine together with trimethylchlorosilane. The i.r. and 1H-n.m.r. spectroscopic data of the new compounds are given.
    Notes: Lithium(di-tert-butyl)phosphid reagiert mit Dicyclopentadienylterbium-bzw. Dicyclopentadienylholmiumchlorid unter Abspaltung von Lithiumchlorid und Bildung von Dicyclopentadienyl(di-tert-butylphosphino)terbium bzw. -holmium. Dicyclopentadienyl(di-tert-butylphosphino)erbium entsteht bei der Umsetzung von Dicyclopentadienylerbiumchlorid mit Ditert-butyl-(trimethylsilyl)phosphin unter gleichzeitiger Freisetzung von Trimethylchlorilan. Die IR- und 1H-NMR-spektroskopischen Daten der neuen Verbindungen werden angegeben.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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