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  • 1955-1959  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 39 (1958), S. 96-101 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Disturbances in the critical frequency of theF2-region of the ionosphere at Watheroo on international magnetically disturbed days are analyzed together with simultaneous geomagnetic data at the same station. The results show that the daily average disturbanceDm (foF2) becomes negative or positive according as the maximum of the disturbance daily variationSD (foF2) takes place in night time or in daytime respectively. This fact may show that bothDm (foF2) andSD (foF2) are due to the condition that the daytime increase in the daily variation of theF2-region is reduced or enhanced owing to vertical drift of the ionosphere caused by electric currents responsible for geomagneticSD.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 34 (1956), S. 36-50 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Résumé On étudie les proprietés magnétiques et cristallographiques des solutions solides rhombohédralesxFeTiO3. (1−x) Fe2O3 de l'hématite (Fe2O3) et de l'ilménite (FeTiO3) pour l'étendue totale de 0 ≦x ≦ 1. Les échantillons examinés sont des minéraux séparés par des grains naturels et des grains artificiellement synthétisés. On montre que les minéraux de la série hématite-ilménite sont ferromagnétiques pourx〉0.55 et que leur point de Curie diminue en proportion à l'acroissement de x: il est atteind à 0
    Abstract: Zusammenfassung Die magnetischen und krystallographischen Eigenschaften der festen LösungenxFeTiO3. (1−x) Fe2O3 von Hämatit (Fe2O3) und Ilmenit (FeTiO3), die eine rhombohedrale Krystallstruktur haben, wurden im ganzen Bereich von 0 ≦x ≦ 1 ausführlich untersucht. Die untersuchten Proben waren aus Naturgesteinen getrennten sowie aus zusammengesetzten künstlichen Mineralkörner. Die Minerale der Hämatit-Ilmenitschen Reihe von 0.55〈x sind ferromagnetisch, und ihr Curie-Punkt nimmt proportional mit der Zunahme vonx ab, und fallsx ungefähr 0.8 erreicht, wird er 0
    Notes: Summary Magnetic and crystallographic properties of solid solutionsxFeTiO3. (1−x) Fe2O3 of hematite (Fe2O3) and ilmenite (FeTiO3), which have rhombohedral crystal structure, are examined in detail for the whole range of 0 ≦x ≦ 1. Samples examined are mineral grains separated out from natural rocks and artificially synthesized ones. The minerals of the hematite-ilmenite series for 0.55〈x are ferromagnetic and their Curie-point decreases in proportion to increase inx, becoming 0
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 1472-1473 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Localities A, B, and C of sampling Pre-Cambrian gneiss in Ongul Island Fig. 2. Position of the north pole of the Earth's centred dipole estimated from magnetic polarization of Antarctic Pre-Cambrian gneiss The locality of Syowa Base is about 69 00'S. and 39 35/E. Rock samples examined ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 179 (1957), S. 37-38 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] 2TiO2.FeO was prepared in the following way. A fine powder mixture of pure Fe2O3, TiO2 and Fe in a stoichiometric ratio, sealed in a quartz tube evacuated approximately to 10~3 mm. mercury, is quenched from 1,150° C. after being maintained at this temperature for 2 hr. Analysis by means of a ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 177 (1956), S. 179-180 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The samples examined here are the ferromagnetic minerals separated out from the Haruna rock (upper diagram) and the Sokota rock (middle diagram). Both these minerals are mainly ilmenite and hsematite solid solutions, the Curie points of which range from 100 C. to 320 C. When these samples are kept ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 175 (1955), S. 35-36 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] All the magnetic experiments showed that the reversed thermo-remanent magnetism of these minerals and their mother rock is due to the effect of close interaction of these two different ferromagnetic constituents during the process of their cooling in a magnetic field. This is in full agreement with ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 890-891 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Intensity of thermo-remanent magnetism of synthetic iJmenite-hsematite a;FeTiO3. (1 a;)Fe2O3 series as dependent on x. O O, Just after synthesis at 1200 C. and quenching: x------x, after heat treatment Recently, evidence has been obtained showing that this property of reverse ...
    Type of Medium: Electronic Resource
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