Matrix approach to the solution of electromagnetic induction in a spherically layered earth     

Karel Pěč  Zdeněk Martinec  Jana Pěčová  Reviewer M. Hvoždara 《Studia Geophysica et Geodaetica》1985,29(2):139-162

Summary Matrix formulae for the intensities of the M- and E-fields have been derived. They have been applied to express the apparent resistivity, the transfer function, as well as the frequency equation determining the frequencies of free motion of the M- and E-waves. A fast algorithm for computing the transfer function and the apparent resistivity has been suggested.

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Preparation of input data,inclusive of satellite data,for forecasting precipitation within a limited area     

Pavla Kočíková  Věnceslava Pretlová  Reviewer O. Zikmunda 《Studia Geophysica et Geodaetica》1985,29(1):75-99

Summary The inclusion of cloudiness characteristics, obtained by computer analysis of multispectral satellite photographs, in the objective analysis of the dew-point temperature deficit is suggested for the mesomodel. The basic principle of the method is the correction of mathematically packed data using processed satellite cloudiness observations. Special fast algorithms for constructing bicubic splines are used to effect the basic mathematical packing.

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Calculation of temperature distribution in two-dimensional geothermal profile     

Jan Šаfanda  Reviewer A. Janáčková 《Studia Geophysica et Geodaetica》1985,29(2):191-207

Summary The temperature-depth distribution along the 250 km long Czechoslovak part of DSS profile VII was calculated to a depth of 40 km. The two-dimensional solution of the steadystate equation of heat conduction in an inhomogeneous medium, obtained by means of the finite difference method, was used. By resolving the observed surface heat flow into two components, one of which is generated by heat sources inside the model and the other is connected with the heat flow from deeper parts of the Earth, the heat flow at the lower boundary of the model was estimated and used here as a boundary condition in the numerical solution. To reduce the differences between the calculated and observed surface heat flow, the heat sources in the upper 10 km of model were optimized. A regularization process, in which the variation of the sought function was limited, was used both to estimate the heat flow and to optimize the sources.

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Sunrise effect on atmospherics and its relation to the direction of the night noise source     

Vojtěch Letfus  Emil M. Apostolov  Jan Klimeš  Reviewer J. Laštovička 《Studia Geophysica et Geodaetica》1982,26(3):281-294

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Seismic response analysis of two-dimensional absorbing structures     

Jiří Zahradník  Reviewer I. Pšenčík 《Studia Geophysica et Geodaetica》1982,26(1):24-41

Summary A computational method (based on finite differences) is proposed for the seismic response analysis of the Earth's structures. The method is applied to the earth fill and the sedimentary basin. It was found that the lateral inhomogeneity of non-absorbing structures caused remarkable effects on synthetic seismograms, viz. strong horizontal reflections at later arrivals. In absorbing structures these effects are much less pronounced and the response is determined primarily by the variable thickness of the structures. The responses of structures with non-causal or causal absorption differ only slightly, but they are strongly influenced by the magnitude of the absorption itself.  相似文献   

Thermal and electric conductivity of three basaltic rocks of the Bohemian Massif under high temperatures     

Z. V. Chanishvilli  Marcela Laštovičkova  Vladimír Kropáček  Reviewer A. Janáčková 《Studia Geophysica et Geodaetica》1982,26(1):93-95

Summary The thermal, temperature and electric conductivities of three alkaline basalts are compared for temperatures ranging from 20 to 900 °C.  相似文献   

The properties of groundwater: Georg Matthess, 1982. John Wiley & Sons, 406 p., $45.95     

Tomáš Pačes 《Geochimica et cosmochimica acta》1982,46(11):2414

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Appreciation of spherically symmetric models of electrical conductivity     

J. Pěčová  Z. Martinec  K. Pěč 《Pure and Applied Geophysics》1987,125(2-3):291-318

A procedure is suggested of a more effective and faster computation of the impedance, the transfer function and amplitudes of the induced field in a spherically symmetric model of the electrical conductivity. The existing induction data have been supplemented by about 80 new values derived from the analysis of daily means. The fit of the existing 1-D models of the electrical conductivity of the mantle to the set of induction data is investigated. The characteristic equation for the free electromagnetic oscillations of a radially inhomogeneous Earth is derived and its possible importance in solving the inverse problem of electric conductivity is pointed out.  相似文献   

ЧИСЛЕННЫЕ ЭКСПЕРИМЕНТЫ С ИСКУССТВЕННЫМИ ЯДРАМИ СУБЛИМАЦИИ В СТРУЙНОЙ МОДЕЛИ КУЧЕВОГО ОБЛАКА     

Daniela Řezáčová  Sněžana Todorova  Рецензенm J Bednář 《Studia Geophysica et Geodaetica》1987,31(4):397-403

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Summary A formation of ice particles on artificial deposition INis described. INacting in dependence on the temperature and supersaturation over the ice are considered in the 1 D SSconvection cloud model with detailed microphysics including freezing. The limiting influence of the water vapour pressure upon the concentration of active INis shown resulting from the dependence of water vapour pressure on the ice particle concentration.

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Geometrical aspects of differential GPS positioning     

Petr Vaníček  Richard B. Langley  David E. Wells  Demitris Delikaraoglou 《Journal of Geodesy》1984,58(1):37-52

Differential GPS positioning is considered from the purely geometric point of view. The tetrahedron formed by two ground stations and two satellite locations is the basic geometrical building block for differential satellite positioning. Relationships between the various vectors involved in this tetrahedron are described. These relationships are used to develop linear mathematical models which relate the vector baseline between the two ground stations to various kinds of differential GPS observations. Geometrically, all proposed observation types can be considered as either differential range observations or differential range difference observations. In the absence of instrumental and refraction effects, it is found that differential range observations are geometrically superior to differential range difference observations. Some implications of these geometrical considerations to practical differential GPS positioning are discussed.  相似文献