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  • Articles  (929)
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  • Articles  (929)
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  • 1960-1964  (929)
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  • 1
    Electronic Resource
    Electronic Resource
    ÜBER DIE DIMENSIONIERUNG UND DAS VERHALTEN VON REGELKREISEN IM SEISMISCHEN VERSTÄRKER (1964)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 12 (1964), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The purpose of the automatic gain control in seismic amplifiers is to balance the slow decrease of the signal in such a manner that its energy does not exceed the capacity of the recording system. At the same time the interesting seismic content of the signal has to be preserved as undistortedly as possible. At first, the technical data of AGC circuits are calculated. The characteristic curves of circuits with one, two, and three time constants are computed. In circuits with two and more time constants an oscillating of the AGC is possible. In order to guarantee aperiodic operation, the ratio of the time constants must not fall below a certain value. As long as these technical conditions are complied with, the free choice of the largest time constant remains open and can be accommodated to the geophysical conditions.From the endeavour to balance the slow decrease of the signal as well as possible, an upper limit for the choice of the time constants can be derived. A lower limit is obtained from the condition that the seismic content of the signal has to be preserved. The determinant time constant should lie between the two limits and differ from them as much as possible.Finally, the problem of the amplifier “squeezed” by energy pulses is touched.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1964.tb01907.x
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  • 2
    Electronic Resource
    Electronic Resource
    BOOK REVIEW (1964)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 12 (1964), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Book Review in This Article:P. F. Shokin, Gravimetry (Apparatus and Methods for Measuring Gravity)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1964.tb01910.x
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  • 3
    Electronic Resource
    Electronic Resource
    SOME PHYSICAL ASPECTS OF SEISMIC SCALING LAWS FOR UNDERWATER EXPLOSIONS (1964)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 12 (1964), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The paper deals with quantitative seismic measurements near underwater explosions. The blastings were carried out in an artificial small pond, the records were taken in adits, situated vertically below the charge. The range of charges extended from one detonator to 200 g of Ammon-Gelit explosive.Conventional seismic scaling by comparing amplitude and size of charge does not yield a simple power law, the exponent being larger for smaller charges and vice versa. This result is due to the different frequency-spectra of the seismic pulses, as shown by harmonic analysis. In contrast to this, the seismic energy as calculated from the records is directly proportional to the size of charge over the whole range.During the Lago Lagorai experiments in 1962 some quantitative seismic measurements near the shot point were also carried out. The relevant results are compared with the preceding ones and some differences are discussed.Some conclusions can be drawn:〈list xml:id="l1" style="custom"〉1The normal methodes, investigating the amplitude only, gives in many cases no clear description; this is especially true for nearby measurements with widely varying frequencies. Therefore it is suggested to extend conventional seismic scaling by including information on the frequency-spectrum and the kinetic energy of the seismic signal.2In order to get clear experimental data for theoretical investigations, it is necessary to extend the recording over a half-space, i.e. in adits or boreholes.3Influences of shape and size of the lake, in which the shots are fired, should be taken into account, too.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1964.tb01897.x
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  • 4
    Electronic Resource
    Electronic Resource
    A LABORATORY STUDY OF STREAMING POTENTIALS (1964)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 12 (1964), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The magnitude of the streaming potential due to the passage of a liquid through a porous medium is examined, under conditions similar to those found in an aquifer under the action of a pumping well. Three models simulate flow in channels, conduits, and unconfined aquifers for several grain sizes of sands and for several resistivities of fluids. The ratio of the streaming potential to the pressure difference is constant for a selected sand and fluid, decreases as grain size increases, is essentially independent of the geometry of the flow, increases slightly as the permeability decreases, and decreases as the salt concentration increases. Extremely low streaming potentials can be expected near a pumping well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1964.tb01889.x
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  • 5
    Electronic Resource
    Electronic Resource
    TIDAL GRAVITY CORRECTIONS FOR 1965 (1964)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 12 (1964), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0345.2003.02049.x-i1
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  • 6
    Electronic Resource
    Electronic Resource
    BOOK REVIEW (1964)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 12 (1964), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Book received in this Articles:P. E. Potter and F. J. Pettijohn, Paleoccurrents and Basin Analysis
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1964.tb01894.x
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  • 7
    Electronic Resource
    Electronic Resource
    WAVE FRONT INVESTIGATIONS IN MODEL SEISsMOLOGY (1963)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 11 (1963), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: A method is described which allows to measure the elastic wave motion in the “interior” of two-dimensional solid models. It is based on the measurements of the lateral deformations of a plate that are related to the state of compression in the plane of the plate. A capacitive detector measuring the motion has been developed.Wave front studies have been carried out in a half space, in two half spaces in contact and in a single-layered half space. The experimental results are compared with theory. Special attention has been paid to the head wave.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1963.tb02047.x
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  • 8
    Electronic Resource
    Electronic Resource
    Energie des vibrations et filtrage (1963)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 11 (1963), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1963.tb02053.x
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  • 9
    Electronic Resource
    Electronic Resource
    ORIGIN OF OIL (1963)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 11 (1963), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: All sorts of organic matter preserved under anaerobic conditions and transformed in reducing environments may form components of natural crude oils; such oils are linked to sapropel deposits by their contents in porphyrins and trace metals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1963.tb02037.x
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  • 10
    Electronic Resource
    Electronic Resource
    DETERMINATION DE L'EPAISSEUR DES SEDIMENTS MEUBLES A L'AIDE DE LA METHODE DE STATISTIQUES DE ΔT (1963)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 11 (1963), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Offshore reflection records, even if they are of medium quality, can be used to determine the thickness of unconsolidated sediments. The method is described and its limits are specified. An example of application referring to the Gulf of Lyons is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1963.tb02042.x
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