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  • Articles  (49,007)
  • 1965-1969  (49,007)
  • Geosciences  (49,007)
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  • 1
    Electronic Resource
    Electronic Resource
    Operational interpretation of some integral equations occurring in impulsive wave propagation problems in layered media (1966)
    Springer
    Pure and applied geophysics 63 (1966), S. 11-14 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Inversion formulae for the operational interpretation of some integral equations, with the exponent of the integrand involving any number of radicals, are given. Equations of the form considered here are of common occurrence to quite a wide variety of impulsive wave propagation problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875153
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  • 2
    Electronic Resource
    Electronic Resource
    Mixed boundary value problem in an elastic quarter-space (1966)
    Springer
    Pure and applied geophysics 63 (1966), S. 60-67 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The stress and displacement throughout a homogeneous, isotropic, elastic quarterspace have been evaluated when the stress is prescribed on one of the plane boundaries and the displacement on the other. The variations of the displacement and stress on the boundaries with time and distance from the origin have been shown graphically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875158
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  • 3
    Electronic Resource
    Electronic Resource
    Moon mass approximation in algebraic form analogous to activity sphere formula (1966)
    Springer
    Pure and applied geophysics 63 (1966), S. 105-108 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The concept of comet orbit activity sphere as introduced byD'Alembert and developed byLaplace is modified and applied to the Sun-Earth-Moon system, leading to a new approximate relationship between astronomical constants usually regarded as independent quantities. When Sun-Earth mass ratio, the astronomic unit, and Earth-Moon separation distance are taken as known, an elementary algebraic formula gives the Earth-Moon mass ratio in terms of these. Despite the inherently imprecise character of this type of calculation, surprisingly close numerical agreement with independently determined values is obtained. The great simplicity and directness of the result contrast with ardous orthodox inference procedures for the lunar mass, suggesting that newer methods of general dynamic analysis are required in the study of asymptotic states of the three-body problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875161
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  • 4
    Electronic Resource
    Electronic Resource
    Geomagnetic multipoles, 1829 to 1960 (1966)
    Springer
    Pure and applied geophysics 63 (1966), S. 121-132 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Using the results of spherical harmonic analyses of the geomagnetic field for some fourteen different epochs, includingGauss' first analysis for epoch 1835, and theErman-Petersen analysis for epoch 1829, the strength and axes of geomagnetic multipoles have been computed. In particular, a dipole from the three first order spherical harmonic coefficients, a quadrupole from five second order coefficients, and an octupole from seven third order coefficients. The axes of the quadrupole and octupole have moved quite rapidly when compared with movements of the dipole axis, and show a general movement westwards. Although the strength of the dipole has generally diminished, the strengths of the quadrupole and octupole have generally increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875163
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  • 5
    Electronic Resource
    Electronic Resource
    Application of array data processing techniques to the swedish seismograph stations (1966)
    Springer
    Pure and applied geophysics 63 (1966), S. 82-104 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary An efficient tool in seismic signal analysis is offered by the array data processing techniques which are based upon similarity of pulse shapes between stations. Records at the six Swedish stations in general exhibit the signal resemblance required by the array methods. By applying a simple processing technique, the signal-to-noise ratio is increased by a factor of about 2, and the accuracy ofP-wave readings is improved. High similarity is found not only between the same phase (P, pP) at different stations, but also between different phases (P, pP) at the same or different stations. Altogether, records of eleven earthquakes were investigated in detail. The Swedish station network can be considered as a ‘super-large aperture seismic array’ (SLASA), despite some differences in instrumental equipment. A general adaptation of array techniques to SLASA systems is discussed. Such methods will greatly improve the seismological information which can be extracted from ordinary station records, provided the stations are located on geologically homogeneous ground.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875160
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  • 6
    Electronic Resource
    Electronic Resource
    A gamma spectrometric study of Mont-Blanc granite samples (1966)
    Springer
    Pure and applied geophysics 63 (1966), S. 153-160 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Gamma-ray spectra of the samples were measured by standard laboratory multichannel spectrometry. The weighted least squares method was applied to the digital output data in order to determine the concentrations of U238, Th232 and K40 present. U and Th increase towards the rim of the massif (from 4 ppm U and 20 ppm Th in the coarse-grained central facies to 23 ppm U and 42 ppm Th in the fine-grained rim variety), whereas K remains fairly constant at ∼3.85%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875165
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of magnetic inclination in borecores (1966)
    Springer
    Pure and applied geophysics 63 (1966), S. 133-152 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary In palaeomagnetism it is usually assumed that the distribution of directions of natural remanent magnetization at a site is Fisherian. This assumption is used here for an analysis of dispersion on a sphere when only inclination (and not declination) of NRM directions is known. By this method, in spite of the lack of declination data, the mean inclination and precision of the parent Fisherian population are estimated, together with the probable errors in these estimates. The method is tested against known Fisherian populations and is then used for dealing with data from borecores, where the way-up of cores and dip of the hole are known, but the azimuth of cores is not. Uses of the information derived from this analysis include estimations of age of NRM, support for palaeomagnetic data from surface studies, and comparison of dispersion of the palaeomagnetic field with that of the present geomagnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875164
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  • 8
    Electronic Resource
    Electronic Resource
    Erklärung der magnetischen Strukturen der im Nickel-Arsengitter kristallisierenden Verbindungen der 3d-Übergangsmetalle (1966)
    Springer
    Pure and applied geophysics 63 (1966), S. 161-171 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Es wird gezeigt, dass sich die vonWollan undKanamori vorgeschlagenen Austauschmechanismen (letzterer in modifizierter Form) auch zur Erklärung der magnetischen Strukturen der im Nickel-Arsen-Gitter kristallisierenden Verbindungen der 3d-Übergangsmetalle eignen. Unter Berücksichtigung der direkten Wechselwirkungen können Erklärungen für die Unterschiede in der Höhe der magnetischen Umwandlungstemperaturen gegeben werden. Das paramagnetische Verhalten der Titanverbindungen wird auf das Fehlen lokalisierter magnetischer Momente zurückgeführt. Die Abnahme der magnetischen Umwandlungstemperaturen innerhalb der Reihe MeS, MeSe, MeTe (Me=V, Fe, Co, Ni) wird damit erklärt, dass diep-Funktionen der Anionen mit steigender Ordnungszahl an Stabilität verlieren, wodurch die «Richtwirkung» der Anionenfunktionen vermindert wird.
    Notes: Summary It is shown, that the kinds of superexchange mechanism ofWollan andKanamori are suitable for declaring magnetic structures of nickel-arsen-type compounds of the 3d-metals. Differences of the curie-temperatures are interpreted by change of direct exchange. Paramagnetic behaviour of the titan compounds is declared by lacking of localised magnetic moments. Reduced curie-temperatures within the serie MeS, MeSe, MeTe (Me=V, Fe, Co, Ni) indicate that anion-p-functions with rising ordinal number have decreasing stability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875166
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  • 9
    Electronic Resource
    Electronic Resource
    An attempt to the explanation and to the prediction of the eleven-year cycle of solar activity (1966)
    Springer
    Pure and applied geophysics 63 (1966), S. 205-210 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary According to the author the reason of the subsistence of the 11 years' sunspot cycle is to be found in the conjunction of the planets. As a result of the investigations it has been stated that from among the nine planets the joint tidal effect of Venus-Jupiter-Earth is a decisive factor in the variations of sunspot activity. The above three planets are every 10.4 years and 12.0 years respectively, in a close conjunction. The mean value (11.2 years) is in an almost full accordance with the average cycle-period. The fluctuations of the period of the cycle come from the fact that the planets' getting into approximately one line takes a different time within each cycle. This time delay is the cause of the stronger or weaker sunspot activity, and of the shorter or longer cycles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875170
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  • 10
    Electronic Resource
    Electronic Resource
    An investigation of the size frequency resolution of an aerosol by the static method of diffusion (1966)
    Springer
    Pure and applied geophysics 63 (1966), S. 220-230 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Theoretical considerations are put forward for identifying the Dynamic and Static Methods of Diffusion measurements of aerosol particles. On the basic of this equality the Exhaustion Method of Diffusion developed byPollak andMetnieks for the size-frequency resolution of a heterogeneous aerosol by Dynamic Diffusion Methods should be applicable to Static Methods. This hypothesis is tested using a Pollak-Nolan nucleus counter as decay vessel. It is shown that turbulence in the counter is the most serious obstacle against this type of approach to finding the size components of an aerosol. The time involved, the high humidity in the counter and a hypothetical nucleus-free zone are other major difficulties for relatively large Aitken nuclei. It is established, however, that for particles whose diffusion coefficient is of the order of 10−3 cm2 sec−1, the proposed method should be quite workable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875172
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