Zur Kristallstruktur des Bismuthinits,Bi2S3     

Prof. Dr. V. Kupčík  Ludmila Veselá-Nováková 《Mineralogy and Petrology》1970,14(1):55-59

Zusammenfassung Es wurde eine Bestimmung der Kristallstruktur des Bismuthinits Bi₂S₃, die bisher nur als Analogie der Antimonitstruktur bekannt war, durchgeführt. Es zeigte sich, daß die Kristallstruktur des Bismuthinits weitgehend mit der von Antimonit übereinstimmt. Die Koordinationspolyeder sind allerdings regelmäßiger als beim Sb₂S₃ und bei einem der beiden kristallographisch unabhängigen Bi-Atome zeigt sich bei genauer Betrachtung ein deutlicher Unterschied, so daß die Koordination von diesem als 3+3+1 gegenüber 3+2+1 beim Antimonit bezeichnet werden kann.

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The crystal structure of bismuthinite

Summary The crystal structure of bismuthinite Bi₂S₃ was determined. It showed that the analogy to the structure of stibnite is correct in general. The coordination polyhedra are more regular compared to those in Sb₂S₃. One of the crystallographic independent Bi-atoms shows a distinct difference in coordination, 3+3+1, compared to the equivalent atom in antimonite, 3+2+1.

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Application of the restrictedD-optimal design to gravimetry     

Ludmila Kubáčková  Ivana Jakubcová  Miloš Pick  Stanislav Hrách  Reviewer J. Anděl  Reviewer Z. Šimon 《Studia Geophysica et Geodaetica》1979,23(1):10-16

Summary The theory of the restricted D-optimal design was used for the project of gravity measurements in a pressure chamber. An example of the measurements is presented.  相似文献   

Investigation of the stochastic properties of anomalous geophysical potential fields defined at points of the surface of an ellipsoid     

Ludmila Kubáčková  Reviewer J. Anděl 《Studia Geophysica et Geodaetica》1981,25(3):211-223

Summary Using a general model, constructed for random fields defined on a Lyapunov surface, the stochastic properties of fields defined at points of the surface of a tri-axial rotational ellipsoid are investigated within the correlation theory of these fields.  相似文献   

Probability model for studying the spectral anomalous geophysical fields     

Ludmila Kubáčková  Reviewer M. Burda 《Studia Geophysica et Geodaetica》1975,19(1):1-7

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Autocovariance function and the spectral density of the anomalous gravitational field,transformed by an integral operator of the convolution type     

Ludmila Kubáčková  Reviewer M. Burda 《Studia Geophysica et Geodaetica》1974,18(4):329-338

Summary The transfer of the fundamental statistical characteristics, i.e. covariance function and the density of the statistical power spectrum, of a random homogeneous field across a linear homogeneous filter is investigated. The results obtained are applied to the study of the said statistical characteristics of transformed anomalous gravitational field.  相似文献   

Change in the spectrum of a gravity anomaly caused by expressing it discretely     

Ludmila Kubáčková  Reviewer M. Burda 《Studia Geophysica et Geodaetica》1973,17(4):306-313

Summary The spectral content of an operation which may be called the operation of selecting the step for treating a certain, discretely expressed datum, continuous by nature is shown.  相似文献   

On the problem of the existence and uniqueness of a discrete,surface, optimum wiener filter,applied to the filtering of geophysical fields     

Ludmila Kubáčková  Reviewer O. Šefl 《Studia Geophysica et Geodaetica》1973,17(3):199-204

Summary Proof is given of the existence and uniqueness of a discrete, surface, optimum (in the Wiener sense) filter for filtering geophysical fields considering a spectral approach to the construction of the said filter. It is also shown that the filtration coefficients and the filtration errors of the filter, constructed with the help of statistical estimates of the required spectral densities, converge towards their theoretical values. From the mathematical point of view, this paper concludes the building-up of the mathematical model of the discrete Wiener optimum surface filtration, suitable for geophysical fields.  相似文献   

On the structure of the interplanetary magnetic field under non-stationary boundary conditions     

Ludmila Třísková  Igor S. Veselovskij  Reviewer L. Křivský 《Studia Geophysica et Geodaetica》1988,32(4):362-367

Summary The structure of the interplanetary magnetic field (IMF) is investigated theoretically in a kinematic approximation under frozen-in conditions in the solar wind and non-stationary boundary conditions. As an example, a time-dependent model of the IMF, created in the case of a change of the general magnetic field of the Sun represented by the dipole term, is analyzed. Very simple assumptions as to the field of velocities in the solar wind are made. The results show the formation of zero IMF points of two types(O, X). Points of theO-type are formed and move radially in the equatorial plane. They are surrounded by magnetic clouds with loops of lines of force. Points of theX-type are formed and move radially above the poles.

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muu u¶rt;aa mma nam aum n() uamu nuuuu nu uu mu m u mauaau uu. am nua ama ¶rt; , ua nu uuu aum n a, n¶rt;ma ¶rt;un , auu m u. mum n m m ¶rt;a nmu n¶rt;nu. mam naam aau m ¶rt; mun(O, X). uO-muna uam u ¶rt;um a¶rt;ua amua nmu. u aumu aau nmu u uu. uX-muna uam u ¶rt;um a¶rt;ua a¶rt; nau.

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Optimum processing of gravimetric observations affected by the drift in a one-stage net,and the analysis of the accuracy of the results     

Ludmila Kubáčková  Reviewer M. Pick 《Studia Geophysica et Geodaetica》1986,30(3):236-241

Summary By using a general model of optimum elimination of systematic effects[5], the procedure has been developed for the optimum processing of gravimetric observations affected by the drift in a one-stage net, and statistically justified characteristics of the accuracy of the points of this net have been determined.

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u uuu u ¶rt;u nmua uuauu um amuu uu [5] aamaa m¶rt;ua nmua amuaumuu uu ¶rt; aa ¶rt;-man mu; nu¶rt; mamumuu aamumuu mmu m¶rt; m m mu.

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КРИТИКА     

Ludmila Kubáčková  Miloslav Kopecký 《Studia Geophysica et Geodaetica》1985,29(4):415-416

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