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  • 1965-1969  (14)
  • 1
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Unter Anwendung der Formeln für das Feld eines Quaders wird eine Methode entwickelt um die durch einen Körper beliebiger Form erzeugten magnetischen Anomalien mit Hilfe eines Rechenautomaten zu berechnen. Umgekehrt kann die Methode verwendet werden, um aus den beobachteten Anomalien den Magnetisierungsvektor zu bestimmen. An einem Beispiel wird die Anwendbarkeit, die Genauigkeit und die Schnelligkeit der Methode erläutert. Die Methode kann auch für die Berechnung von magnetischen Terraineffekten verwendet werden. Zudem wird eine neue Methode dargelegt, welche eine rasche Berechnung des Entmagnetisierungseffektes eines Körpers beliebiger Gestalt und inhomogener Magnetisierung ermöglicht. Anwendbarkeit und Genauigkeit der Methode werden besprochen. Die Methode wurde verwendet, um den Einfluss der Suszeptibilität auf die Inhomogenität der induzierten Magnetisierung in einem Würfel zu untersuchen. Für Körper beliebiger Form mit kleiner Suszeptibilität wls neuer Begriff der mittlere Entmagnetisierungsfaktor eingeführt. Mittlere Entmagnetisierungsfaktoren für eine zylindrische Probe werden tabelliert.
    Notes: Summary With the aid of formulae derived for the field caused by a finite rectangular prism, a machine method is developed for rapid computation of magnetic anomalies due to a body of any shape. Conversely, the method could be utilised for determination of the magnetization vector from the observed anomalies. An example is given to demonstrate the applicability, accuracy and speed of the method. The method is shown to be suitable also for the evaluation of magnetic terrain effects. In addition, a new method is presented which enables high speed calculation of demagnetization effect caused by a body of arbitrary shape where the magnetization in general may be inhomogeneous. Applicability and accuracy of the method are discussed. The method is applied to study the effect of susceptibility on inhomogeneity of the induced magnetization in a cube specimen. For a body of any shape with low susceptibility, a new concept of average demagnetization factor is introduced. Average demagnetization factors so calculated for a cylindrical specimen are tabulated.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary A simple method is presented for computing the gravity and magnetic profiles across two-dimensional bodies of arbitrary shape. The computer programme makes use of expressions for the attraction caused by an infinitely long sheet and it takes only a few seconds to compute a profile both for gravity and magnetic anomalies and their vertical and horizontal derivatives. Accuracy of the method is shown to be as good as that of graticules and owing to the use of simpler formulae, the method appears to be faster than the method of polygons.
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  • 3
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Es wird eine Apparatur beschrieben die es ermöglicht, Gesteinsproben mit Hilfe von Wechselfeldern schrittweise zu Entmagnetisieren. Dabei werden die unstabilen Komponenten der Magnetisierung entfernt, während ein Teil der stabilen Magnetisierung erhalten bleibt. Die Apparatur wurde verwendet, um die Stabilität der in den Gesteinsproben durch künstliche Beblitzung erzeugten Magnetisierung zu untersuchen. Es wird gezeigt, dass die durch starke Blitze erzeugte remanente Magnetisierung recht stabil sein kann und dass es in gewissen Fällen selbst Wechselfeldern mit Feldstärken bis zu 1700 Oe nicht gelingt, diese harte Magnetisierung zum Verschwinden zu bringen. Möglichkeiten, um den störenden Einfluss der Blitze bei päleomagnetischen Untersuchungen zu vermeiden, werden besprochen.
    Notes: Summary An apparatus is described which enables progressive demagnetization of rock specimens under alternating fields in order to remove the unstable components of magnetization while retaining a measurable fraction of the stable component. The apparatus is utilized to study the stability of magnetization created in rock specimens by artificial lightning currents. It is shown that the remanent magnetization due to strong lightning currents could be fairly stable and in certain cases peak a. c. fields of intensity as high as 1700 Oe may fail to destroy completely the effect of this hard component. Possible means for avoiding the ‘magnetic noise’ effect of lightning on paleomagnetic investigations are discussed.
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 15 (1967), S. 0 
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: A nomogram is presented which enables evaluation of the components of magnetic attraction of a homogeneous finite rectangular prism, and of gravitational attraction due to a uniform rectangular lamina.In practice any three-dimensional body could be approximated by a number of right rectangular prisms of varying dimensions governed by the shape of the body. The magnetic attraction of the whole body is then obtained by numerical summation of the effects of the constituent prisms.For evaluating the gravitational effect, the cross-section of the body corresponding to each elevation contour is approximated by a number of rectangular laminae (or by a stepping polygon) the attraction of which can be determined with the aid of the same nomogram. The total gravitational attraction of the body is obtained by a process of graphical integration along the vertical axis.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 219 (1969), S. 325-336 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The temperature variations of the electrical resistivity of alkali metals lithium, sodium, potassium, rubidium and caesium are calculated in the free electron approximation and using Krebs's model for the phonon spectrum. The double average over the Fermi surface is evaluated by an improved method due toBailyn and the separation between normal and Umklapp processes is affected in a more satisfactory manner. The results of the calculations are compared with the experimental data obtained at different temperatures. The theoretical resistivity curves for sodium, potassium, rubidium and caesium show satisfactory agreement with experiment, but not in the case of lithium.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 221 (1969), S. 47-52 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The temperature dependence of the thermal resistivity of alkali metals lithium, sodium, potassium, rubidium and caesium is determined within the free electron approximation by using Krebs's model for the phonon dispersion relations. The normal and Umklapp contributions are obtained separately from an improved method following the procedure of an earlier paper. The results of calculations are compared with available experimental information. The theoretical and experimental resistivity curves are found to be of similar nature, but they show considerable disagreement at low and high temperatures.
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  • 7
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary A simple method is designed for programming the gravity and magnetic calculations of a right circular cylinder (vertical or horizontal) by treating it as a combination of thin rectangular slabs. It takes only a few seconds to compute a profile of each kind and the accuracy is comparable to that obtained by using exact expressions (involving complete elliptic integrals) instead. The method is also applicable to cylindrical bodies of arbitrary cross-section and could as well be used for rapid computation of derivatives of gravity and magnetic anomalies.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Annali di matematica pura ed applicata 74 (1966), S. 203-226 
    ISSN: 1618-1891
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary The authors have defined the product of two summability methods and have applied it to Fourier series. The criterion are analogous to the known criterion Convergence of Fourier series.
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  • 9
    ISSN: 1618-1891
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary In this paper the authors have studied the behaviour of the sequence of Fourier coefficients by applying Harmonic and Nörlund transforms.
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 213 (1967), S. 92-92 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The experiments were performed in twelve mongrel dogs of either sex, weighing between 8 and 17 kg. The animals were anaesthetized with pentobarbitone sodium 35 mg/kg injected intravenously. Blood pressure was recorded from the right carotid artery with a mercury manometer. The right femoral vein ...
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