Mineralogical data on a sulphosalt from the Rhodope mountains,Bulgaria     

V. Kupčík  L. Franc  E. Makovický 《Mineralogy and Petrology》1969,13(2):149-156

Zusammenfassung Bei dem Versuch, die Kristallstruktur von Bonchevit zu bestimmen, stellte sich heraus, daß dieses Mineral—bis dahin PbBi₄S₇—aus zwei Phasen besteht. Der Hauptanteil wurde eindeutig als Galenobismutit identifiziert. Der Rest wies nach den Gitterkonstanten (a₀=13,58±0,02 Å, b₀=20,51±0,07 Å, c₀=4,09±0,07 Å) auf ein bisher unbekanntes Mineral hin. Die Raumgruppe ist Bbmm. Ein indiziertes Pulverdiagramm und die dazugehörigen d-Werte werden angegeben.Die Emissionsspektralanalyse zeigt Pb und Bi als Hauptkomponenten, Cu und Ag als Nebenkomponenten und Spuren von Zn und Sn. Die Strukturanalyse führte zu der Formel Me₅S₆, wobei die Me-Atome etwa gleich schwer sind, so daß als chemischo Formel nur Pb₃Bi₂S₆ mit Z=4 in Frage kommt.Strukturell gehört das Mineral in die Gruppe Andorit-Ramdohrit-Fizelyit. Die Verwandtschaft bzw. Identität des Minerals mit anderen Mineralen und synthetischen Verbindungen wird diskutiert.

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Mineralogical data on a sulphosalt from the Rhodope mountains, Bulgaria

Summary During an attempt to determine the crystal structure of bonchevite, this mineral was found to consist of two phases. Previously it was thought to have the composition PbBi₄S₇. The main constituent could unambiguously be identified as galenobismutite. For the rest the lattice constants (a₀=13.58±0,02 Å, b₀=20.51±0,07 Å, c₀=4.09±0.07 Å), indicated a new mineral. Space group is Bbmm. An indexed powder diagram (with d-values) is given.The emission spectrographic analysis shows Pb and Bi to be main components, Cu and Ag to be minor components, and traces only of Zn and Sn. The structure analysis has led to the formula Me₅S₆, with Me-atoms of approximately the same atomic number; therefore, the chemical formula has to be Pb₃Bi₂S₆, with Z=4.In a structural classification the mineral belongs to the andoriteramdohrite-fizelyite-group. The relationships to or the identity with other minerals and synthetic compounds are discussed.

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The Effect of Geomagnetic and Solar Activity on the Distribution of Controlling Pressure Formations in the Northern Hemisphere in Winter     

Bochníček  Josef  Hejda  Pavel  Pýcha  Josef 《Studia Geophysica et Geodaetica》1999,43(4):390-398

The distribution of controlling pressure formations, occurring in the Northern Hemisphere during the winters (January and February) of the years 1952 – 1996, has been analysed. It was found that the deepening of the Icelandic and Aleutian pressure lows is connected not only with a particular QBO phase and level of geomagnetic activity (Bochníek et al., 1999) but also with a particular level of solar activity.  相似文献   

Evaluation of pre-CHAMP gravity models `GRIM5-S1' and `GRIM5-C1' with satellite crossover altimetry     

J. Klokočník  Ch. Reigber  P. Schwintzer  C. A. Wagner  J. Kostelecký 《Journal of Geodesy》2002,76(4):189-198

 The new GFZ/GRGS gravity field models GRIM5-S1 and GRIM5-C1, currently used as initial models for the CHAMP mission, have been compared with other recent models (JGM 3, EGM 96) for radial orbit accuracy (by means of latitude lumped coefficients) in computations on altimetry satellite orbits. The bases for accuracy judgements are multi-year averages of crossover sea height differences from Geosat and ERS 1/2 missions. This radially sensitive data is fully independent of the data used to develop these gravity models. There is good agreement between the observed differences in all of the world's oceans and projections of the same errors from the scaled covariance matrix of their harmonic geopotential coefficients. It was found that the tentative scale factor of five for the formal standard deviations of the harmonic coefficients of the new GRIM fields is justified, i.e. the accuracy estimates, provided together with the GRIM geopotential coefficients, are realistic. Received: 20 February 2001 / Accepted: 24 October 2001  相似文献   

Relation between the extreme angular and areal distortion in cartographic representation     

Vladislav Hojovec  Luděk Jokl  Reviewer J. Kašpar 《Studia Geophysica et Geodaetica》1981,25(2):132-151

Summary The paper presents the method of deriving representations, optimal from the point of view of global characteristics, for areal and extreme angular distortion (3), (7), if one is optional and the other characteristic is minimized at the same time. If a special minimization method (Section 5) is used for computer processing, the problem can be solved in the region of representation equations in the form of polynomials of the 3rd or 5th degree, while assuming symmetry relative to the equator and the central meridian. Thus, the method enables both the fundamental global characteristics to be regulated freely. Their dependence is illustrated in graphs (Figs 2 and 6) depending on the selected examples of representations of the whole globe. The latter shows that method is a contribution for cartographic practice as well.  相似文献   

Deformation properties of the lithosphere derived from data on recent crustal movements of the earth     

T. L. Tolkunova  Reviewer O. Novotný 《Studia Geophysica et Geodaetica》1978,22(3):295-298

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Klasse Äquivalenter,in Meridianen äquidistanter Abbildungen     

Vladislav Hojovec  Rezensent M. Pick 《Studia Geophysica et Geodaetica》1978,22(3):231-240

am u aa auu uau, anm n u¶rt;uaa. u n nu m na uu; ¶rt; a am u¶rt; am ¶rt;uua au nu ¶rt;a u m¶rt; am. mam u nam n¶rt;m nu n ¶rt;uam, u n n¶rt;m uu, u m [3]. m¶rt; nuam mm, ¶rt;u ¶rt; amauu , u umum a nu.  相似文献   

Elastic properties of eclogite rocks from the Bohemian massif   总被引：1，自引：0，他引：1  

Vladislav Babuška  Jiří Fiala  D. J. Mayson  R. C. Liebermann  Reviewer J. Buben 《Studia Geophysica et Geodaetica》1978,22(4):348-361

Summary Compressional velocity anistropy has been studied in detail at atmospheric pressure for 78 specimens of 23 types of eclogite rocks from the Bohemian massif. For nine of these rock types, compressional and shear velocities were measured as a function of pressure to750 MPa at room temperature. The velocity anisotropy for both compressional and shear waves is less than4% at high pressure. The velocities increase with increasing garnet content and decrease with increasing symplectitization. The Moldanubian eclogites have significantly higher velocities, on the average, than the eclogites from the Kruné hory crystalline complex, although the densities of both groups are comparable.  相似文献   

Isoseismals of the strongest Friuli aftershocks of September 1976     

Vít Kárník  Dana Procházková  Zdeňka Schenková  Julius Drimmel  Dieter Mayer-Rosa  Dragutin Cvijanovic  Vladimir Kuk  Andelka Miloševič  Francesco Giorgetti  Reviewer J. Janský 《Studia Geophysica et Geodaetica》1978,22(4):411-414

Summary Isoseismal maps of the three strongest Friuli aftershocks of September 1976 were compiled using the contributions from European countries within the shaken area. The characteristic features of the macroseismic fields are discussed.  相似文献   

The response of the total electron content to the interplanetary magnetic sector boundary crossing     

František Blahák  Jan Laštovička  Revievwer L. Křivský 《Studia Geophysica et Geodaetica》1980,24(1):60-64

¶rt;m uu n ¶rt;au m uu nu mau nam aum n. mu uu auam mmmuu uuu ¶rt;u u naam. a¶rt;am auu ¶rt; uuu n ¶rt;au m u u. a auu a¶rt;am nuu amm 245 . ¶rt;aam umnmau m a¶rt;a uu.  相似文献   

Day-time ionospheric disturbances of corpuscular origin in the midlatitudeD-region     

Jan Laštovička  Josef Boška  Reviewer L. Křivský 《Studia Geophysica et Geodaetica》1980,24(2):191-196

¶rt;m uu nau mu m a nu a¶rt;u ¶rt; D-amu u. a¶rt; m nu u u. u¶rt;a a a mu nma u nma mu m (20 ¶rt; 150 ).  相似文献