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  • 1
    Electronic Resource
    Electronic Resource
    TEMPERATURE EXTRAPOLATION TO INFINITE TIME IN GEOTHERMAL MEASUREMENTS (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: A simple calculation procedure that gives the equilibrium temperature in geothermal measurements reduces the reading time in field work from reported 60 minutes to about 10 minutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00904.x
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  • 2
    Electronic Resource
    Electronic Resource
    RESISTIVITY ANALYSIS FOR MODELS OF A SPHERE IN A HALF-SPACE WITH BURIED CURRENT SOURCES (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Boundary-value problems in steady-state current flow were solved numerically in bispherical coordinates for a sphere of arbitrary conductivity in a half-space. Solutions for the potential on the surface of the half-space were examined for the cases where both current sources were on the surface, one source on the surface and the second between the surface and the sphere, and one source on the surface and the other in the sphere. Results show a great similarity with the layered case when the buried electrode is placed between the surface and the conducting region. Such a buried electrode configuration makes it possible to obtain an accurate measurement of the depth to the conductor in both cases. A model with the current electrode placed in a conductive sphere is compared with a three-layered model with the source in a conductive intermediate layer, and results indicate that the lateral extent of a finite anomalous zone can be estimated using these limiting curves. The validity of these theoretical calculations for buried spheres was confirmed experimentally by tests conducted on an analog model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00907.x
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  • 3
    Electronic Resource
    Electronic Resource
    DIURNAL CORRECTIONS TO MAGNETIC SURVEYS—AN ASSESSMENT OF ERRORS (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The comparison of a group of continuous total field stations in Ireland with the record of the total field from Valentia Observatory enables the errors which would be involved in using the Observatory as a diurnal correction base to be examined. For the most part, for a single correction, these errors lie between ± 2 and ± 6 gammas. However, they have three notable characteristics: (i) they are not closely dependent on the magnetic ‘noisiness’ of the day, (ii) they are only marginally reduced by the application of station-base time differences and (iii), they are strongly related to differences between the amplitude of the daily magnetic variation at the station and at the base. A permanent geographical basis for the latter differences enables a system for the estimation of the errors to be proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00900.x
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  • 4
    Electronic Resource
    Electronic Resource
    CORRELATION A DISTANCE (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The automatic picking of seismic sections becomes delicate with the presence of blind zones breaking up the continuity of horizons. This makes it difficult to establish correlations between reflections coming from above and below these blind zones.With the help of a certain number of characteristic parameters, a computer capable of storing a great quantity of data makes it possible to identify the horizons bounding a blind zone. Once this investigation has been made, the coherence between these horizons still has to be measured by making a factorial analysis of these different parameters. The statistical decision functions involved in this analysis are well adapted to computer logic. They enable the probability to be given with which the horizons located above and below blind zones correspond.A program has been worked out to provide the degree of coherence between such horizons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00903.x
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  • 5
    Electronic Resource
    Electronic Resource
    ABOUT A METHOD OF REPRESENTATION OF IP-VALUES OBTAINED OVER SEDIMENTARY FORMATIONS (TWO LAYER CASES). (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: An operative technique is described along with a method of representation of Induced Polarization values obtained over homogeneous rocks against the electrical power per unit volume.The results of similar experiments over two-layer ground, are shown according to the same operative technique and method of representation.With the method of representation suggested in this paper it is possible to distinguish discontinuities and to get information about the thickness of the upper medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00908.x
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  • 6
    Electronic Resource
    Electronic Resource
    A NOTE ON THE USE OF NOMOGRAMS FOR APPARENT RESISTIVITY COMPUTATION (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Nomograms are presented for the purpose of rapid computation of the apparent resistivity functions from the field data for symmetrical and unsymmetrical linear electrode arrays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00917.x
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  • 7
    Electronic Resource
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    REPLY TO DISCUSSION (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), 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.1365-2478.1971.tb00919.x
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  • 8
    Electronic Resource
    Electronic Resource
    A SOLUTION OF THE DIPPING INTERFACE PROBLEM USING THE SQUARE ARRAY RESISTIVITY TECHNIQUE (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Apparent resistivity measurements with the square array technique in the vicinity of a dipping interface have the advantage over collinear array methods that they are less dependent on orientation of the array.In order to exploit this, existing potential solutions for the dipping interface problem have been adapted for the computation of apparent resistivities over such a feature using a square array.Comprehensive interpretation techniques covering this problem are given and the limitations imposed by residual array orientation effects are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00602.x
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  • 9
    Electronic Resource
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    ONDE AMORTIE DE TYPE RAYLEIGH À L'INTERFACE DE DEUX MILIEUX SOLIDES À FORT CONTRAST DE DENSITÉS ET DE VITESSES (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: L'onde amortie de type Rayleigh à l'interface de deux milieux solides à fort contraste de densités et de vitesses est étudiée théoriquement et expérimentalement sur un modèle à deux dimensions plexiglas-laiton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00609.x
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  • 10
    Electronic Resource
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    ANALYSIS OF SOME MULTI-FREQUENCY, MULTI-SEPARATION ELECTROMAGNETIC SURVEYS (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: In the interpretation of anomalies obtained with moving source-receiver dipole electromagnetic surveys, use is frequently made of the so-called phasor or vector diagrams. Most such diagrams are based on model experiments or theoretical calculations on bodies of simple geometry. If the anomaly at some given coil-separation and frequency is known it is possible to predict the anomaly at some other separation and frequency. While the results of such predictions often agree admirably in the laboratory experiments, wide, systematic discrepancies are observed in full-scale field work. Some of the discrepancies can be explained by various phenomenological arguments and in this respect the effect of overburden conductivity appears to be more serious than is generally supposed. The effect of phase rotation due to the overburden is discussed in detail.The paper is mainly a cautionary note based on some full-scale data of multi-frequency, multi-separation surveys against the blind use of vector diagrams, but it also discusses the extent of the extra information and interpretation aid provided by such surveys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00591.x
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  • 11
    Electronic Resource
    Electronic Resource
    MAPPING OF TECTONICS OF SEDIMENTS BY AIRBORNE MAGNETICS (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The considerable increase of sensitivity of new magnetometers allows the elaboration of magnetometric maps with contour intervals of fractions of one gamma. On these maps, small anomalies appear which had never been visible before. They are caused by susceptibility contrasts within the sediments.The areal distribution of these small undulations of the magnetic field depends on tectonics, therefore their analysis can give useful information about the tectonic pattern of the sediments. This paper discusses the automatic transformation of these small anomalies into tectonic units. The problem is solved by a method called Digital Template Analysis which has already yielded very useful results in gravity interpretation.The application of the method described is restricted to surveys executed by high sensitivity magnetometers. Therefore it is supposed that in most oil exploration problems these magnetometers will replace instruments with lower sensitivity. The improved magnetometer surveys in combination with the interpretation method described represent a most efficient, fast and unexpensive reconnaissance method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00596.x
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  • 12
    Electronic Resource
    Electronic Resource
    CAN TRANSITION IN THE ELECTRICAL PROPERTIES OF THE EARTH BE DETECTED? (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The interface phenomena for low periods, i.e. the initial oscillations, and the cut-off periods are two characteristic features in Magnetotelluric Sounding curves. A method is proposed to distinguish between transitional and homogeneous layered earth by means of these two features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00590.x
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  • 13
    Electronic Resource
    Electronic Resource
    MAGNETOTELLURIC EFFECT OF DIPPING ANISOTROPIES (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Reddy, I. K., D. Rankin, 1971, Magnetotelluric Effect of Dipping Anisotropies, Geophysical Prospecting 19, 84–97.A solution is obtained for the magnetotelluric effect in the case of multi-layered earth, each layer containing dipping anisotropy, with the strike of anisotropy oriented at an arbitrary angle to the measuring directions. A technique to compute tensor impedances and tensor apparent resistivities is presented and the importance of anisotropies in magnetotelluric interpretation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00586.x
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  • 14
    Electronic Resource
    Electronic Resource
    RESISTIVITY ANALYSIS FOR PLANE-LAYER HALF-SPACE MODELS WITH BURIED CURRENT SOURCES (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Boundary-value problems in steady-state current flow were solved numerically for one and two layers over a half-space. Solutions were obtained for layers of various resistivities where one of the current sources was placed below the surface and the second kept at some finite distance from the drill hole. When a fixed surface dipole receiving pair was used, it was found that as the buried source approached a conductive region, quite good determinations of the depth to the conductor could be made, hence reducing the possibility of extended drilling in “dry” holes resulting from poor surface data and/or interpretation. Numerous models were generated to find the optimum positioning of the two current electrodes for different field situations of this type. It was also found that by placing a current source in the conductive region, better resolution of the lateral extent of a possible ore zone could be obtained, due both to the more rapid convergence of the apparent resistivity to the resistivity of the conductor, and the fact that a smaller separation in the receiving dipole could be used. Numerous analog models were constructed to verify the digital results. Surface and down-hole resistivity field data are compared to show the strength of this technique in delineating structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00906.x
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  • 15
    Electronic Resource
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    POSITIONING OF MARINE SURVEYS WITH AN INTEGRATED SATELLITE NAVIGATION SYSTEM (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: For almost two years, satellite navigation has been used in reconnaissance exploration. However, only in the last six months has it been demonstrated that an “integrated” system provides navigational accuracy for all geophysical prospecting. This paper describes the accuracy of the integrated system and illustrates its merits.The primary objective of the integrated system is to provide continuous, accurate, geodetic position information. This is accomplished by integrating instantaneous position, velocity and heading from outputs of the Doppler sonar, gyrocompass, velocimeter, vertical references with periodic updates obtained from the Navy Navigation Satellite System. Each of the subsystems, their operations and functions will be discussed.Satellite navigation offers many advantages for marine surveys. Features for point-to-point automatic steering, onboard plotting of shotpoint data, firing of seismic energy source as a function of exact distance and real-time data logging onto digital tape have been implemented. With the onboard computer all navigation, gravity and magnetic information is recorded on tape and some preprocessing and filtering of gravity and magnetic data may be accomplished.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00612.x
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  • 16
    Electronic Resource
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    AUTHORS'REPLY TO COMMENTS BY J. H. MORAN (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), 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.1365-2478.1971.tb00615.x
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  • 17
    Electronic Resource
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    CONTRIBUTION TO SIGNAL BY ELEMENTS OF THIN VERTICAL CONDUCTING VEIN IN DIPOLAR EM SYSTEMS (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: As an extension of the eddy current pattern computed by Koefoed and Kegge (1968) for a thin vertical infinitely-conducting half-plate in presence of oscillating magnetic dipoles, this paper computes the contribution to the (electro-) magnetic anomaly at the receiver by each element of the vein separately. Twelve contour diagrams for such elemental contributions are presented as samples. Two points of general interest stand out: (1) The contributions from different portions of the vein are not all of one sign; the contribution from one part may cancel that from another; and (2) The portion of the vein nearest to the transmitter-receiver system does not necessarily make the largest contribution to the total measured signal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00595.x
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  • 18
    Electronic Resource
    Electronic Resource
    THE APPLICATION OF LINEAR FILTER THEORY TO THE DIRECT INTERPRETATION OF GEOELECTRICAL RESISTIVITY SOUNDING MEASUREMENTS (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Koefoed has given practical procedures of obtaining the layer parameters directly from the apparent resistivity sounding measurements by using the raised kernel function H(λ) as the intermediate step. However, it is felt that the first step of his method—namely the derivation of the H curve from the apparent resistivity curve—is relatively lengthy.In this paper a method is proposed of determining the resistivity transform T(λ), a function directly related to H(λ), from the resistivity field curve. It is shown that the apparent resistivity and the resistivity transform functions are linearily related to each other such that the principle of linear electric filter theory could be applied to obtain the latter from the former. Separate sets of filter coefficients have been worked out for the Schlumberger and the Wenner form of field procedures. The practical process of deriving the T curve simply amounts to running a weighted average of the sampled apparent resistivity field data with the pre-determined coefficients. The whole process could be graphically performed within an quarter of an hour with an accuracy of about 2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00593.x
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  • 19
    Electronic Resource
    Electronic Resource
    CORRELATION OPTIQUE EN LUMIERE COHERENTE (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Fontanel, A., G. Grau, 1971, Corrélation optique en lumière cohérente, Geophysical Prospecting 19, 98–117.This paper describes a general bidimensional two-step method of correlation (or convolution) making use of the theory of holography.In the first step the light diffracted by one of the two plane transparent objects to be correlated interferes with the light diffracted by the other one. The hologram thus generated is photographed in the focal image plane of a convergent lens. Owing to the quadratic detection property of the photographic emulsion, the square of the modulus of the product of the spectra of the two objects considered is recorded on the photographic plate.In the second step the convolution product of the two objects appears when the hologram is illuminated with a beam of coherent light.In its geophysical application this optical method of convolution makes it easy for us to obtain the autocorrelogram of a seismic cross-section. This method also makes it possible to correlate each of the seismic traces by special precalculated optically-recorded filters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00587.x
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  • 20
    Electronic Resource
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    SCALE MODEL SEISMIC EXPERIMENTS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: An experimental arrangement is described using an electric spark as source and barium titanate as a detector. Model experiments were made in water with the source mounted above the surface. The effect on the pulse shape on transmission through the air-water interface and the change of pulse shape with depth were investigated. A number of profiles are presented of reflections from a slate slab immersed in the water with different arrangements of the model and detector.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1956.tb01414.x
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  • 21
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    THE TECHNICAL-ECONOMIC ASPECTS OF AUTOMATIC DATA REDUCTION (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The background of automatic data processing as well as other improvements in prospecting methods is almost certainly economic. Consciously and intentionally or intuitively and even subconsciously, economic forces are the drive for improvements.Automatic processing can contribute to the increasing utility of seismic data. Reduction in the amount of routine work will permit talented people to utilize their time creatively on the more difficult problems. At the same time automatic reduction will provide for a greater volume of work. These two aspects will probably provide the first effective pressure for a high degree of automation.It is to be expected, however, that the ultimate and greatest value will be better interpretation; possibly more detail, possibly clearer more definitive interpretation, possibly both.Time concepts in the processing of seismic data are, of course, vital; either in simple time corrections of either static or dynamic nature or in treatment of signals in the time domain.Much development work is needed before these advantages can be realized. Principal development needed is an increase in dynamic range in the overall system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1956.tb01413.x
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  • 22
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    BOOK REVIEW (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Book review in this articleHarold M. Mooney and W. W. Wetzel: “The Potentials about a Point Electrode and Apparent Resistivity Curves for a Two-, Three- and Four-Layer Earth”, The University of Minnesota Press, Minneapolis. Price $ 18.–.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1956.tb01418.x
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  • 23
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    SOME PROBLEMS OF SHALLOW REFRACTION INVESTIGATIONS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The term shallow refraction, as used in this paper, refers to investigations confined to the superficial layer of rocks, composed primarily of unconsolidated material. To define the scope of the discussion it will be assumed that the term shallow refraction applies to work of which the lower limit is approximately 300 feet and the upper of the order of a few feet. The consideration of the small magnitude of quantities measured (distances and times) determines the perspective of the problems involved, since difficulties encountered in the interpretation, although equally disturbing whether in deep or shallow work, will cause a greater percentage of error in the latter case. The purpose of this paper is to discuss and illustrate these problems. The factors considered include the location of the geophone spread in relation to the topography of the site, influence of the ground conditions in the vicinity of geophones on recorded times, consideration of the shallow uphole shots and problems arising from the repeated use of the same shothole. The rapid variation in the vertical velocity of the overburden and errors due to it are discussed together with the effects of a non homogeneous unconsolidated material and velocity reversal. The effects of the ill-defined solid rock surface are also considered. It appears that as the depth of investigations becomes shallower, the limits of the practical capabilities of the method are approached, because the differences between the theoretical assumptions and the actual conditions become more pronounced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1956.tb01401.x
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  • 24
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    THE RELATION BETWEEN SIZE OF CHARGE AND AMPLITUDE OF REFRACTED WAVE (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Experiments carried out using charges of up to 200 lbs. at a distance of about 20,000 ft. from the geophones suggest that the amplitude of the refracted wave ground motion is roughly proportional to the weight of charge. Simple energy considerations lead one to expect a relation of a form in which velocity amplitude is proportional to W.An explanation of the observed relation may be based on a theory according to which the efficiency of the explosion increases with the source size, that is the distance from the source at which the pressure wave of the explosion ceases to cause permanent deformation of the surrounding medium.The above theory was further confirmed by measurements of the radius of the cavity produced by explosions of charges of different size in clay. Also, explosion of charges in artificial water-filled cavities were found to give seismic wave amplitudes three or four times greater than those produced by the same charge in a narrow hole. It is possible that these observations explain in part why the charges required in marine refraction experiments are very much smaller than those needed in refraction work on land, but additional reasons for this difference are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1956.tb01403.x
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    THERMAL NEAR-SURFACE EXPRESSION OF SHALLOW GEOLOGICAL FEATURES (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: It has been customary in geothermal studies to assume the surface to be an isothermal plane, though difficulties existed to explain the magnitude of thermal anomalies observed in the field under this assumption. Detailed investigations of temperatures at depths between 5 cm and 230 cm show that—after removal of the strong diurnal variations—sizeable anomalies persist right to the surface. Thus, the effective heat transfer (coefficient) at the surface might be lower than commonly assumed.
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    A METHOD FOR INTERPOLATION AND EXTRAPOLATION OF POTENTIAL FIELD DATA (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The application of automatic methods to the processing of potential field survey results has led to the need for the development of special procedures for the interpolation and extrapolation of such data. A method is proposed which utilizes the mathematical properties of potential field data to achieve a minimum distortion solution to the interpolation/extrapolation problem. The proposed method is suitable for use with any data point distribution. Digital computer programs have been prepared using the method; results obtained through the use of the programs are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00912.x
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    SISMIQUE MINIERE A HAUTE FREQUENCE (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: La sismique réflexion a été mise en œuvre dans des galeries de mines avec un appareillage nouveau: dispositifs appropriés, géophones spéciaux, chaîne d'enregistrement haute fréquence (30–2000 hertz).Des réflexions à des fréquences de l'ordre de 600 à 1200 hertz ont été obtenues dans les cas favorables sur des couches de charbon de l'ordre du mètre situées jusqu'à une soixantaine de mètres sous la galerie.Une bonne compacité des terrains situés autour de la galerie est une condition nécessaire à l'obtention de réflexions. Les accidents affectant les couches peuvent alors être visibles.
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    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00916.x
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    CONDENSED REPORT BY THE SECRETARY-TREASURER AND THE EDITOR FOR THE YEAR 1970 (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    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.1365-2478.1971.tb00600.x
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    THIRTY THIRD MEETING OF THE EUROPEAN ASSOCIATION OF EXPLORATION GEOPHYSICISTS, HELD IN HANOVER, 8th–11th JUNE, 1971 PRESIDENTIAL ADDRESS (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
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    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00599.x
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    FIRST EXPERIENCE AND RESULTS WITH A NEW SEISMIC INTERPRETATION METHOD (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: At the EAEG meeting in Venice (May 1969) Linsser presented a new method for the interpretation of seismic measurements (“Transformation of Seismic Data into Geological Models by Digital Template Analysis”). First results were presented during the S.E.G. convention in Calgary (September 1969). Meanwhile some experience concerning the possibility of the application of this method is available.Starting from the fact that the computer is able to store several physical parameters (amplitude, wave-length, direction of the seismic event, coincidence with a template and the beginning and the end of each reflection), the importance of these data for the investigation of special geophysical questions will be discussed.This method has been tested with several examples on the following problems:〈list xml:id="l1" style="custom"〉1Proving and exact localisation of faults.2Investigation of velocities of interesting layers.3Additional information for the geological interpretation of seismic sections.4Picking of weak reflections in the “Pre-Zechsteinian” in Northern Germany.Finally the possibilities of further applications and developments are discussed.
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    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00606.x
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    DISCOVERY OF DIRECT-SHIPPING IRON ORE BY GEOPHYSICAL METHODS IN THE CENTRAL PART OF THE LABRADOR TROUGH (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The deposits of the central sector of the Labrador Trough are magnetite-rich iron ores subjected to enrichment by the process of leaching. In spite of the fact that some ore types are porous and low in density, most of the ore zones have undergone a net increase in density brought about by enrichment. In the course of their formation, the magnetic characteristics of the rocks have changed and a great deal of the magnetite was altered to relatively non-magnetic iron oxides and hydrous iron oxides. Consequently, induced as well as remanent magnetization decreased, but the ratio of the latter with respect to the former increased substantially. All drift-covered areas underlain with iron-formation are potential ore producing areas. From measurements of the first two physical properties and determination of the thickness of overburden by means of a combined gravity-magnetic-seismic or resistivity survey, it is possible to detect and distinguish the iron formations and potential ore zones from the country rocks.In spite of the fact that the iron formations are a complex assemblage of rock types, each having different physical and chemical properties, a qualitative and semi-quantitative correlation between the results of the surveys and the geology as well as the structure of the area could be established. Consequently, in order to increase the chances of success, first a mathematical correlation of the amplitude of the gravity anomalies with the specific gravity, the iron content, the silica content, the porosity factors and the dimensions of the underlying orebodies, and secondly, a quantitative correlation of the ground magnetic intensity relative to the reference lithologie unit with the percentage of Fe3 O4 recovery and the volume magnetic susceptibility were done for many deposits.A few discoveries were made with this method. Finally, a fully quantitative interpretation of the geophysical data using a multimodeling analysis led to the discovery of additional direct-shipping iron ore deposits in the Schefferville mining district of Canada.
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    COMMENTS ON RELATIVE CONTRIBUTION TO SIGNAL BY GROUND ELEMENTS IN A TWO-COIL INDUCTION SYSTEM (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
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    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00614.x
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    TWO-DIMENSIONAL MASS DISTRIBUTIONS FROM GRAVITY ANOMALIES: A COMPUTER METHOD (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: A gravity anomaly profile, considered to be associated with a two-dimensional mass distribution of constant density contrast, may be interpreted with the help of a digital computer. Using the infinite slab formula and anomaly values at selected points of the profile, an initial model of the anomalous mass is built. The gravity effect of the model is computed with a simplified version of the formula derived by Talwani, Worzel and Landisman (1959) for line-integration. After the effect is computed at a point, the model is adjusted depending upon the residual anomaly. The effect of the adjusted model is computed at the following point. Within one cycle of computation the model is adjusted as many times as the number of the selected points. Five such cycles are sufficient to minimize residuals in most cases. A final cycle is computed without adjustment.Local anomaly profiles have been interpreted to obtain the shape of a sedimentary basin and of a faulted block. A regional anomaly profile has been interpreted to obtain crustal structure.
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    PREDICTION ERROR FILTERS, WHITE NOISE AND ORTHOGONAL COORDINATES (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Optimum filters can be computed using orthogonal coordinates obtained from the eigenvalues and eigenvectors of the autocorrelation matrix. The method is used to obtain unit distance prediction error filters. The output of a unit distance prediction error filter when applied to the input wavelet is an impulse at zero time. The effect on the output of added white noise is easily obtained using the approach through the orthogonal coordinates. The added white noise results in output wavelets which are no longer impulses at zero time. The decrease in time resolution gives a filter that does not increase undesirable high frequency noise as much as filters computed without white noise.Orthogonal coordinates with little signal energy can be omitted from the filter computation resulting in output wavelets resembling those computed using added white noise.
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    DIFFERENT METHODS OF TIME-DEPTH CONVERSION WITH AND WITHOUT MIGRATION (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The increasing use of velocity analysis programs in seismic processing in addition to direct application to normal move out corrections often makes it possible to study the variation of the average velocity versus time and distance. Usually, it is even feasible to compute interval velocities with a good accuracy.We intend to use these velocities to convert the usual time domain displays to the depth domain.An exact conversion requires the knowledge of all interval velocities and all the velocity interfaces.However, when the dips are small, the conversion can be done without considering the dip of all these interfaces, and in some cases migration can even be completely neglected.Three different programs will be described and their use discussed in view of the type of problems to which they are applied.Practical examples of the various methods will be presented.
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  • 36
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    A CONTROL OF TWO-DIMENSIONAL MAGNETIC INTERPRETATION BY THREE-DIMENSIONAL MODEL BODY ANOMALIES (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: In magnetic routine interpretation the comparison of two-dimensional model curves with measured magnetic anomalies is widely used for an approximate evaluation of the position and depth of magnetic models.Before starting an interpretation of a survey by means of two-dimensional models, it is very useful to have an idea of the shape of anomalies caused by extended but finite bodies, taking into account various strike directions: Three sets of anomalies of thin plates (horizontal length 19, downward length 9, width 1) dipping 30°, 60°, and 90° resp. for various strike directions and an inclination of 20° were computed. Some of these anomalies, e.g. those with nearly N-S strike direction look rather complicated, and at the first glance one would not expect that they are caused by such simple bodies.Several profiles crossing the computed anomalies perpendicularly were interpreted two-dimensionally. For less extended anomalies the depths determined for the top of the plates are 10-20% too small, the magnetization amounts to 50–75 % of the value of the finite bodies. The interpretation of the profiles covering more extended anomalies gave very accurately the same values for the position, depth and magnetization for the two-dimensional body as for the original three-dimensional model.Anomalies of vertical prisms with varying extensions in the y-direction were computed. Their differences in amplitude and in the distance maximum-minimum show that interpretation of short anomalies by two-dimensional methods yields depth errors of up to 20 percent.To see the possibilities of the separation of superimposed anomalies dike anomalies were added to the anomaly of a broad body in great depth and several attempts were made to interpret parts of the composite anomalies. The interpreted bodies lie too deep. In complicated cases the depth values can have large errors, but experienced interpreters should be able to keep the errors in the range of one third of the depth values.
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    THE UTILITY OF CARBORNE RADIOMETRIC SURVEYS IN PETROLEUM EXPLORATION OF GLACIATED REGIONS (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Carborne gamma radiation surveys over petroleum reservoirs and faults in the glaciated Michigan Basin suggest that this mobile technique may be useful in reconnaissance subsurface exploration, especially in fault detection. This conclusion assumes favorable surface conditions, as well as proper instrumentation, field procedures, and interpretive techniques. Glaciated regions are relatively undesirable terrains for gamma radiation surveys. Thick deposits of glacial drift appear to repress the detection of subsurface features. Furthermore, extremely heterogeneous soil conditions, which are characteristic of many glaciated regions, result in excessive radiation interference. The operational conditions which produced optimum results consisted of continuous profiling on unconsolidated roads, employing two simultaneously operated scintillation counters. Optimum detection was obtained during relatively cool nighttime traverses.
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    A NEW METHOD OF CANCELLING MULTIPLE REFLECTIONS: “SOUSTON” (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Cancelling of multiple reflections by CDP stacking is generally incomplete. When the order of coverage is low, an improvement may be obtained by the use of special filters (e.g. Schneider et al: Geophysics 1965; D'Hoeraene: Geophysics 1966). But when the order of coverage is high, the efficiency of these filters is less obvious. On the other hand, the higher the order of coverage, the higher the efficiency in the solution presented.Schematically, our method includes three steps:Firstly: Searching for the multiple reflections.For this purpose Move Out corrections corresponding to the multiples are applied to each individual record, then CDP stacking is carried out.Secondly: Cleaning up of the individual records.“Decorrections” are firstly applied, then multiples are subtracted. For this, subtraction is weighed versus the energy of the multiples, that is to say versus the correlation between the original record and the pure multiple reflections.Thirdly: Normal processing with the cleaned records which have been obtained.The different steps of this method are illustrated with the help of theoretical examples. Its efficiency improvement in regard to normal CDP stacking is then demonstrated by means of true examples.
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    TRANSFORMATIONSEIGENSCHAFTEN VON NÄHERUNGSFORMELN DER ZWEITEN VERTIKALABLEITUNG (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
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    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00910.x
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    ADAPTIVE SIGNAL PROCESSING THROUGH STOCHASTIC APPROXIMATION (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: One of the problems in signal processing is estimating the impulse response function of an unknown system. The well-known Wiener filter theory has been a powerful method in attacking this problem. In comparison, the use of stochastic approximation method as an adaptive signal processor is relatively new. This adaptive scheme can often be described by a recursive equation in which the estimated impulse response parameters are adjusted according to the gradient of a predetermined error function.This paper illustrates by means of simple examples the application of stochastic approximation method as a single-channel adaptive processor. Under some conditions the expected value of its weight sequence converges to the corresponding Wiener optimum filter when the least-mean-square error criterion is used.
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    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00913.x
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    VELOCITY DISPERSION OF SEISMIC WAVES (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: In well velocity surveys made to calibrate Sonic (CV) Logs the calibration survey uses frequencies around 50 Hz whereas the Sonic Logging tool uses frequencies around 20 kHz. There thus exists the possibility of making a direct measure of velocity dispersion. In any one survey the disturbing factors, both instrumental and operational, will often mask any dispersive effect that might exist. Consequently this paper reports on a statistical analysis of the velocity differences resulting from calibration surveys and Sonic logs. Only Borehole Compensated Sonic Logs were used. Four areas were investigated: the North Sea, Abu Dhabi, Libya and Alaska. After rejecting logs and calibration records which were obviously in error there remained 424000 feet (about 130 km) of usable log distributed throughout 66 wells. The four areas were analysed separately and in no case was the estimated dispersion significantly different from zero. However, the mean values did correlate with lithology from (− 0.17 ± 0.18)% for the essentially carbonate section in Abu Dhabi to (+ 0.45 ± 0.25)% for the sand-shale section in Alaska, a positive sign meaning that the higher frequencies travelled faster. Except for Alaska the calibration surveys were made with a wall-clamp geophone, and for these areas amplitude measurements were made. After suitable corrections estimates of the absorption parameter Q were obtained. These varied from 20 to 200 with mean values of 63 for Libya, 70 for Abu Dhabi and 88 for the North Sea (excluding the Tertiary). If, as is usually assumed, the absorption mechanism is linear and is described by a Q which is independent of frequency, then these values would necessarily imply dispersion of several percent. As instanced above no such dispersion was observed. It is possible that the expected dispersion was compensated for by invasion of the mud filtrate into the borehole walls, but it is more likely that the absorption mechanism was substantially non-linear.
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    RECENT DEVELOPMENTS IN WELL VELOCITY SURVEYS AND THE USE OF CALIBRATED ACOUSTIC LOGS (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: In recent times, velocity surveys at marine well locations have been performed using non-explosive energy sources such as air-guns and gas guns. In addition, surveys in land wells have been successfully carried out using a modified version of the air-gun. This paper illustrates some of the characteristics of these devices and compares the data obtained from typical surveys with conventional dynamite surveys.Since data obtained from well velocity surveys using non-explosive sources are now commonly recorded on tape, they lend themself to further digital processing and interpretation techniques that were not previously so conveniently available. Some examples of these processes, e.g. the examination of attenuation, frequency and energy content of the recorded well geophone signals, are given in the paper. Examples of some other digital processes, using calibrated Acoustic logs, whether recorded digitally in the field or subsequently converted from analogue recordings, are also given in the paper. These include the construction of an Acoustic log in the vertical axis from logs obtained in deviated wells.
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    MULTIPLE REFLEXIONEN IN NORDWESTDEUTSCHLAND (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: In N.W. Germany multiple reflections have been observed in numerous areas. They are not curiosities but represent true problems.In many cases these multiples are recognizable by routine Δt analysis of the records. Sometimes the Δt anomalies are so great that multiples can be recognized without any computational work, merely by looking at the records. This is due to the great contrast between the interval velocities of the Tertiary and of the Upper Cretaceous. One example is discussed fully.Most of the multiples are of the type AB (a multiple caused by reflections at two different reflectors A and B, and at the surface). It is also shown (by a rough estimate) that this type of multiple is theoretically the most probable. Finally, the interference between the two components of AB (one multiple being reflected first at A, then at B, and the other reflected first at B, then at A), and its appearance in constructed examples, are discussed.
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    A TORSION-MAGNETOMETER FOR MEASURING THE VERTICAL COMPONENT OF THE EARTH'S MAGNETIC FIELD (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The paper describes a vertical component magnetometer for field work whose magnet system is provided with a torsion axis and in which torsion serves as a standard of measurement. When a measurement is taken the magnetic axis of the system is brought back into the horizontal position by altering the angle of twist (null-method). The angle of twist is thus a direct measure of the vertical intensity. The instrument is within wide limits independent of the magnetic north-south direction and may therefore be set up in practically any position. The magnet system is temperature compensated, well damped and provided with an automatic clamping device. With a scale value of 25 gammas per scale division the range of the instrument for direct measurements is 65000 gammas. A tripod of special design enables a measurement to be taken in about one minute. The weight of the torsion magnetometer inclusive of tripod is only 2.9 kg (6.4 lb).
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    ON THE RELIABILITY OF HARMONIC ANALYSIS OF SEISMOGRAMS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Since harmonic analysis of seismograms seems to become more familiar in the interpretation of seismic data, the author presents the results of a thorough check analysis. Following a fixed scheme, one seismogram is analysed by means of a mechanical analyser (system Mader-Ott). Standard deviation of Fourier coefficients is examined, and scattering in phase values is discussed. At the best, in the range of maximum amplitudes of the spectrum, the method yields 6% in phase scattering. At the worst, on either side of the spectrum, 13 % are obtained. Generally 8 % have to be taken in account. (Percentages in periods of partial-waves of the analysis). The results are in accordance with former routine analysis (Korschunow, 1955).
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    APPLICATION OF DELAY AND INTERCEPT TIMES IN THE INTERPRETATION OF MULTILAYER REFRACTION TIME DISTANCE CURVES (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The well known quantities, delay and intercept times, can be made fully useful in the interpretation of multilayer refraction problems dealing with small undulating dips.The identification of the individual refractors is made by the use of reciprocal and intercept times and by applying an additional and useful relationship, namely that the delay time profile between two shot-points should match the half-intercept time profile when calculated using the true velocity of the refractor.With a suitable arrangement of shot-points this relation permits us to obtain the true horizontal velocity of a refractor from one direction of shooting only.Presentation of the refraction results in the form of time sections, similar to those used in reflection surveys, is often desirable. These sections can be converted easily into depth sections, once the overburden velocities are defined.The use of the method is limited not only by the dip, but also by the depth of the refractor. Deep refractors can be, however, worked out by this method, by reducing a multilayer problem to that of two layers, using again the delay times.
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    SEISMIC EFFICIENCY OF EXPLOSIVES (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The parameters which characterize an explosive are derived from laboratory tests and none is directly usable for seismic purposes. Another one, derived from field experiments is proposed in this paper. It allows the comparison of two different explosives. The test must be conducted with care. Precautions concerning the equipment and the shot point detailed. The first available results suggest that the new parameter does not depend on the size of the charge nor on the shooting conditions, though the experimental data are not numerous enough to allow a general statement. It is shown how a coefficient of seismic efficiency can be used for selecting an explosive; and considerable amounts of money can be saved by the best choice. More studies on the generation of artificial seismic waves would be highly profitable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1956.tb01402.x
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    GEOELECTRIC EXPLORATION OF INCLINED THIN BEDS AND ORE VEINS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The equation for the deformation of the homogeneous electrical field caused by a long inclined thin plate, is given. By means of this equation a diagram is designed for the direct depth determination of the upper and the lower edge and for the inclination of the plate. The equation and the diagram are proved by small scale model measurements and applied in field exploration.
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    BOOK REVIEW (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
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    Notes: Book review in this article“Regional Gravity Investigations on the Eastern and Central Commonwealth of Australia”, by C. E. Marshall and H. Narain; University of Sidney, Department of Geology and Geophysics, Memoir 1954/2, October 1st, 1954, 101 pp.
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    TUNIS TO LISBON AIRBORNE MAGNETOMETER PROFILE (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The results of an 805-mile (1300 km) airborne magnetometer profile flown across Tunisia and Algeria, from Tunis to the coast west of Oran, across north-western Spanish Morocco and Tangier, and across south central Portugal to Lisbon are presented. The general geology of the zone over which the profile was flown is shown with the magnetic variations. Depth, structural and rock type interpretations have been made from the magnetic control. The depth values are believed to be high due to angle of the flight line with respect to the probable maximum gradient of the magnetic anomalies. However, depth values are given in all of the basins of possible interest.
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    URL: http://dx.doi.org/10.1111/j.1365-2478.1956.tb01393.x
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    INSTRUMENTAL DISTORTION AND THE SEISMIC RECORD (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: This paper is presented to the geophysicist concerned with the interpretation of seismic records. Those instrumental factors which can affect the validity or accuracy of the records are detailed. Inferences are drawn relating to the picking, timing and grading of reflections, and the shooting of records in the field.
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    URL: http://dx.doi.org/10.1111/j.1365-2478.1956.tb01395.x
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    A NEW METHOD OF MEASURING THE EARTH'S MAGNETIC FIELD (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: This paper describes the measurement of the Earth's total magnetic field by a determination of the frequency of free precession around this field of the protons in a sample of water. The angular frequency of precession, ω, is related to the field F by the relationship ω=γpF where γp is the gyromagnetic ratio of the proton.A bottle of water is magnetised in a direction approximately at right angles to the earth's field, by passing a current through a coil wound around the bottle. The current is switched off rapidly, leaving the magnetic moment vector to precess around the earth's field direction, inducing in the coil a small alternating voltage. This voltage is amplified and its frequency measured by means of a counter. The accuracy of measurement of the total field is estimated at ± 0.5γ.In addition to the total field value, the form of the signal voltage contains information on the field gradient across the sample.Simple theory, experimental details and results are given.
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    GEOELEKTRISCHE BAUGRUNDUNTERSUGHUNGEN IN JUGOSLAWIEN UND OESTERREICH (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Examples are given illustrating the application of geo-electrical methods to engineering problems in Austria and Yugoslavia. A large number of these examples deal with dam problems. In this field, resistivity methods are used for bedrock investigations, to check the efficiency of cement injections into the rock, and to investigate the seepage of water underneath the dam. In the building and maintenance of roads, resistivity methods are used for the detection of cavities underneath the road. On the Vienna air port, a radio method was used for the same purpose.
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    ON SEISMIC WAVE PROPAGATION IN ANISOTROPIC MEDIA WITH APPLICATIONS IN THE BETUN AREA, SOUTH SUMATRA (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: An analytical solution of refraction problems in anisotropic media is based on the expression for the refraction angle in an uniaxial anisotropic medium with vertical axis and elliptic anisotropy. The theory is applied to a test on the anisotropic behaviour of the sedimentary section in the vicinity of Betun, South Sumatra, employing the results from a refraction profile, a well velocity survey and a radial well survey. It is concluded that, in the Betun area, the anisotropy factor is variable with depth. Its maximum value may be as high as 1.15 in the middle part of the section.
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    DIE AUSBREITUNG ELASTISCHER WELLEN IN ANISOTROPEN MEDIEN (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 4 (1956), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: In seismic underground surveys carried out by Seismos GmbH in siderite mines of Siegerland (Germany) anomalies in velocities have been found which could be explained only by the assumption of slates being aeolotropic. In this paper some of the peculiarities connected with the propagation of elastic waves in aeolotropic media–especially those consisting of thin beds of isotropic material–are discussed. Schlieren-pictures of wave-fronts are presented, which show the validity of the theory.
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    OPTIMUM DIGITAL FILTERING AND INVERSE FILTERING IN THE FREQUENCY DOMAIN (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Two distinct filters are developed in the frequency domain which represent an attempt to increase the resolution of fine structure contained in the signal whilst keeping the expected filtered noise energy within reasonable bounds. A parameter termed the White Noise Amplification is defined and used together with a measure of the deconvolved pulse width in order to provide a more complete characterisation of the filters. Each of the two main types of frequency domain filters discussed varies in properties with respect to a single adjustable parameter. This may be contrasted with a time domain Wiener filter which in general has three variables: length, delay and an adjustable noise parameter or weight. The direct frequency domain analogue of the Wiener filter is termed a gamma-Fourier filter, and is shown to have properties which span the range from those of a spiking filter with zero least square error at one extreme, to those of a matched filter at the other extreme of its variable parameter's range. The second type of filter considered—termed the modulated Gaussian filter—is similarly shown to be a perfect spiking filter at one extreme of its parameter range, but adopts the properties of an output energy filter at the other extreme.
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    URL: http://dx.doi.org/10.1111/j.1365-2478.1971.tb00914.x
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    REVIEW ON THE BASIC THEORETICAL ASSUMPTIONS IN SEISMIC DIGITAL FILTERING (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: A review of the most significant mathematical properties of digital operators and an introduction to their important applications to seismic digital filtering is given.Basic definitions in the time-series field and the principles of digital filtering are introduced starting from the Z-transform domain.Predictive decomposition for stationary stochastic processes and inverse operators are also discussed.Applications of digital filtering to seismic signal concern the predictive deconvolution, characteristics of dispersive and recursive operators, matched filters, and multichannel operators.A brief discussion on frequency, wave number, and velocity filtering phylosophy is given at the end of the paper.
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    SELECTION OF SEISMIC PICKING BASED UPON THE DIP, MOVE-OUT AND AMPLITUDE OF EACH EVENT (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The general use of continuous CDP seismic lines means that the neighbourhood of each depth point can be considered according to two sets of co-ordinates:— the co-ordinates of the abscissa on the seismic lines and the reflection time, which allow investigation of the local dip of coherent events;— the co-ordinates of the reflection time and the move out, which allow investigations of the average velocity for these same events.The combination of both investigations for each coherent event is a very convenient operation for the seismologist, and can provide some useful interpretation aids such as velocity profiles, or information on the interval velocities.The principles which we use consist in the examination of a large range of possibilities, of which only the most coherent are chosen.Some examples are shown.
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    VERTICAL MAGNETIC DIPOLE OVER TRANSITIONAL EARTH (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Harmonic steady-state solutions for magnetic and electric vector components are obtained for a layered transitional earth in a vertical magnetic dipole field. The conduction currents dominate the displacement currents. The time factor eiωt is implied. MKS units are used.
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    REFLECTIONS ON AMPLITUDES (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Modern seismic recording instruments allow precise measurements of the amplitude of reflected signals. Intuitively we would expect that this amplitude information could be used to increase our knowledge of the physical properties of the reflecting earth.The relevant factors defining the amplitude of a reflection signal are: spherical divergence, absorption, the reflection coefficient of the reflecting interface, the cumulative transmission loss at all interfaces above this, and the effect of multiple reflections.Of these factors, three—spherical divergence, the reflection coefficient and the transmission loss—are reasonably clear concepts (though the estimation of transmission loss from acoustic logs caused some difficulties in the hey-day of synthetic seismograms). Absorption still presents considerable problems of detail, but our understanding has increased significantly in recent years.The factor least well understood is undoubtedly the effect of multiple reflections. Multiple paths having an even number of bounces can have the effect of delaying, shaping and magnifying the pulse transmitted through a layered sequence. Simple demonstations of this phenomenon can be made using elementary thin plates, and these can be presented for various synthetic and real sequences of layers. Such demonstrations lead one to explore the relation between the spectrum of the transmitted pulse and the spectrum of the reflection coefficient series.If it were possible to isolate the amplitude and shape variations imposed by absorption within a layer, there would be a chance that this measure of absorption would be useful as a correlatable or diagnostic indication of rock properties. If it were possible to isolate the amplitude and shape variations imposed by multiple reflections, there would be a chance that this measure would be useful as an indication of cyclic sedimentation and of the dominant durations of the sedimentary cycles. However, the separation of these two effects constitutes a formidable challenge. The very difficulty of this separation suggests that it may be opportune to review the quantitative estimates of absorption made by field experiments.
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    MODÈLES ANALOGIQUES ÉLECTRONIQUES DU PROCESSUS D'EXPLOSION DANS LES ROCHES (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The first part of the contribution deals with the generalization of the solution given by Sharpe and states the elements of the mathematical model of the explosion generating longitudinal waves. The generalization of Sharpe's solution consists in finding out the response of the medium to a pressure p(t) applied at the source, for any value of the ratio K=Vp/Vs covering the range √2 ÷∞.The second part contains the results of the calculation and design of three electronic analog models of the explosion process in rocks. The first is represented by electrical circuits separated by emitter follower circuits. The scheme of the second model has electrical circuits and elements of operational calculus (integrator, summation instrument). The electrical circuits are represented by the two filters simulating the selective effect of the explosion in rocks. The third model is a logical programming scheme of the problem on an analog computer.For the calculus of the electrical parameters of the three schemes we have taken into account scaling of the physical and geometrical parameters of the medium and of the explosion which should ensure the simulation of the explosion process in rocks of all kinds of importance in seismic prospecting.
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    APPROXIMATION OF THE GRAVITATIONAL ATTRACTION OF GEOLOGICAL BODIES (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The gravitational attraction produced by a geological body of irregular shape can be easily determined by dividing it into cubes of small size. The exact expression of the effect of a cube is very complicated, but it can be calculated by using an electronic computer.4851 values of the gravitational attraction were determined for different positions of a cube with the side of 2l and the center in M(x0, y0, z0), for x0∈[0;20], y0∈[0;20] and z0∈[0;10]. Using these values, templates in double logarithmic representation were drawn, with x0 and z0 as parameters and y0 as abscissa, and with x0 and y0 as parameters and z0 in abscissa; this double set of templates permits a good interpolation for all cubes in the considered domain of M.The use of templates was tested to approximate the effect produced by a theoretical model of spherical shape and in a real case of a three-dimensional salt body of known shape based on a large number of boreholes. In both cases very good results were obtained.
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    RAPID NUMERICAL EVALUATION OF TWO-DIMENSIONAL GRAVITY PROFILES (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: A precise method of gravity interpretation is described which uses tables for the attraction of rectangular prisms in all positions relative to a given point. Hence the attraction of any body or combination of bodies may be assessed without complicated mathematical procedures.
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    ESSAI DE DETERMINATION AUTOMATIQUE DES VITESSES SISMIQUES PAR MESURES ENTRE PUITS (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Large memory computers create new possibilities for seismic interpretation in well-drilled areas, and more generally in problems involving deep sources.Records obtained by well-to-surface, surface-to-well and/or well-to-well propagation contain a large amount of information, owing to the great number of seismic rays travelling throughout the subsurface.This paper considers two successive steps:— direct case: computation of the first arrival times of seismic rays propagating through a two-dimensional subsurface with given vertical and horizontal velocity variations;— inverse case: computation of a two-dimensional velocity distribution, knowing the travel times of seismic rays through the subsurface.A computer program has been elaborated to solve both direct and inverse problems. There are no difficulties with the direct case; a certain number of uncertainties remain with the inverse case.
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    THE INFLUENCE OF INDUSTRIAL STRAY CURRENTS ON THE MEASUREMENT OF EARTH POTENTIALS AND THEIR ELIMINATION (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Simultaneous observations of electrical earth-potentials along parallel measuring lines offer a simple but useful method to study telluric and stray-current potentials. Different correlation-factors between the records of both observation points can help to separate telluric from industrial stray-current potentials. A method is suggested to eliminate disturbing impulses of stray currents from continuous telluric current recordings as those made at observatories.The influence of stray currents can also be eliminated from potential readings of an artificial current as applied in geoelectric measurements with the four-point-method. The elimination is possible by a simultaneous observation of the stray-current potentials on an equipotential line of the artificially generated field. The recording examples show an appreciable improvement of the signal-noise ratio without increase in the current. The method is useful for geoelectrical prospecting in areas which are contaminated by industrial noise.
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    THE USE OF COMPUTER GRAPHICS IN GRAVITY INTERPRETATION (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 19 (1971), S. 0 
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    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Computer-Graphics, the visual display of data in digital and analog form, allows immediate interaction between man and machine. This interaction facility is valuable when the user is engaged in model design. By using such a device in gravity interpretation, the geophysicist can overcome the slow process of model simulation constrained by the conventional input/output devices, also maximum control over running programmes can be exerted if needed.
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    INTRODUCTORY REMARKS TO PART II (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    SCREENING OF POSSIBLE THERAPEUTIC AGENTS BY MEANS OF EXPERIMENTAL REPLICAS OF CONNECTIVE-TISSUE DISEASES (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
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    CLINICAL ASPECTS FOR THE APPRAISAL OF DRUGS USED FOR THE TREATMENT OF THE ANGINAL SYNDROME (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    NEUROHORMONAL FACTORS IN THE ORIGIN AND TREATMENT OF ANGINA PECTORIS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    THE DESIGN OF PROPER EXPERIMENTS TO INVESTIGATE CLINICAL ANGINA PECTORIS AND THE IMPORTANCE OF KNOWING THE DETERMINANTS OF CORONARY FLOW IN CONSIDERING THERAPY OF ANGINA PECTORIS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
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    Topics: Natural Sciences in General
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    INTRODUCTORY REMARKS TO PART III (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    ARRHYTHMIAS FOLLOWING EXPERIMENTAL CORONARY OCCLUSION AND THEIR RESPONSE TO DRUGS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    SCREENING OF DRUGS FOR ANTIARRHYTHMIC ACTIVITY (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
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    RELATION BETWEEN ATRIAL AND VENTRICULAR ANTI-ARRHYTHMIC ASSAY METHODS: RATIONALE FOR A SCREENING PROGRAM (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1956.tb36830.x
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    CORRELATION BETWEEN PHARMACOLOGICAL TESTS AND CLINICAL TRIAL (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    INHIBITORS OF CHOLESTEROL BIOSYNTHESIS AND THE PROBLEM OF HYPERCHOLESTEROLEMIA (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    SERUM LIPOPROTEINS AND THE EVALUATION OF ATHEROSCLEROSIS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    ATHEROSCLEROTIC COMPLICATIONS IN HYPERTENSIVE DISEASE (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    EXPERIENCES IN ASSESSING ESTROGEN ANTIATHEROGENESIS IN THE CHICK, THE RABBIT, AND MAN (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    INTRODUCTION TO PART V (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    A COMPARATIVE APPROACH TO THE EVALUATION OF DRUG EFFECTS UPON AFFECTIVE BEHAVIOR (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    USE OF INTRACEREBRAL ELECTRODES TO EVALUATE DRUGS THAT ACT ON THE CENTRAL NERVOUS SYSTEM (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    THE EXPERIMENTAL EVALUATION OF SEDATIVE AGENTS IN ANIMALS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    THE PREDICTABLE VALUE OF ANTICONVULSANT INDICES (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    THE EXPERIMENTAL EVALUATION OF ANTIPARKINSONIAN COMPOUNDS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    RADIOCALCIUM STUDIES IN PREGNANCY (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    THE CORRELATION BETWEEN ANIMAL TESTING PROCEDURES AND CLINICAL EFFECTIVENESS OF CENTRALLY ACTING MUSCLE RELAXANTS OF THE MEPHENESIN TYPE (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    CONCLUDING REMARKS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    CALCIUM AND PHOSPHORUS TRANSFER IN INTACT DAIRY COWS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    ABSORPTION AND METABOLISM OF CALCIUM IN HUMAN BEINGS, STUDIED WITH CALCIUM45 (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    STUDIES ON THE MAINTENANCE OF SERUM CALCIUM LEVELS BY PARATHYROID ACTION ON BONE AND KIDNEY (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    Topics: Natural Sciences in General
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    THE INFLUENCE OF THE PARATHYROIDS ON THE CALCIUM CONCENTRATION OF MILK (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    CHELATING AGENTS IN THE STUDY OF RENAL ABSORPTION OF ALKALINE EARTH CATIONS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    THE SUPPRESSION OF URINARY CALCIUM AND MAGNESIUM BY ORAL SODIUM PHYTATE: A PRELIMINARY REPORT (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    OSTEOMALACIA IN NORTH CHINA: ITS RELATIONSHIP TO PREGNANCY AND LACTATION (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    STUDIES ON PARTURIENT PARESIS IN CATTLE (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    CALCIUM BALANCES AND CHANGES OF SOME BLOOD AND URINARY CONSTITUENTS AS RELATED TO PARTURIENT PARESIS IN DAIRY COWS (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    EFFECT OF PARTURIENT PARESIS AND THE ORAL ADMINISTRATION OF LARGE PREPARTAL DOSES OF VITAMIN D ON BLOOD CALCIUM AND PHOSPHORUS IN DAIRY CATTLE (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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    URINARY CALCIUM EXCRETION AND BLOOD CALCIUM LEVELS IN THE BOVINE NEAR THE TIME OF PARTURITION (1956)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 64 (1956), S. 0 
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    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
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