A comment on determining the induced magnetic field in bodies of arbitrary shape     

Josef Bochníček  Tomáš Zelinka  Reviewer T. Kolbenheyer 《Studia Geophysica et Geodaetica》1981,25(4):411-412

Summary The authors prove that the solution of Laplace's equation under Neumann's boundary conditions can be transformed to an advantage into determining the field which is generated by charges, induced by the external field at surfaces of discontinuity.  相似文献   

Changes of anisotropy of the magnetic susceptibility of rocks induced by a magnetic field     

Aleš Kapička  Reviewer F. Hrouda 《Studia Geophysica et Geodaetica》1981,25(3):262-274

Summary The changes of the anisotropy of magnetic susceptibility of igneous rocks, induced by a magnetic field, are studied. It is proved that changes in the degree of anisotropy of susceptibility and of the orientation of the susceptibility ellispoid of specimens occur due to the configuration of the domain structure under the effect of the magnetic field. The influence of this effect on the total anisotropy of rocks depends on the degree of anisotropy due to the shape factor and on the stability of the domain structure. A model concept is presented, explaining the qualitatively different pattern of the changes of the anisotropy of susceptibility under the effect of the magnetic field in various directions of the specimens.  相似文献   

An algorithm for the minimum-length least-squares solution of a set of observation equations     

František Charamza  Reviewer L. Kubáček 《Studia Geophysica et Geodaetica》1978,22(2):129-139

Summary A new computer-oriented algorithm GSO is presented for solving overdetermined systems of linear observation equations according to the principle of the least-squares method. The matrix of the system of observation equations may be of deficient rank. In this case the algorithm leads to the vector of unknowns with a minimum Euclidean norm. Alternatively, it is possible to minimize the norm of a subvector formed by a selected group of unknowns. The weight coefficient matrix, corresponding to the vector (subvector) of unknows, has the least possible trace. The algorithm GSO is based on the Gram-Schmidt Orthogonalization of suitably defined augmented matrices. The establishing and solving of normal equations is not necessary. Apart from the unknowns and residuals, GSO also determines the factorized weight coefficient matrices of the adjusted values.Presented at the I.A.G. International Symposium on Optimization of Design and Computation of Control Networks, Sopron, Hungary 1977.  相似文献   

Elastic constants computed for a medium composed of this anisotropic layers     

Karel Klíma  Reviewer K. Pěč 《Studia Geophysica et Geodaetica》1978,22(1):45-49

Summary The problem of the elastic properties of a medium composed of thin anisotropic layers is treated. The study is based on the conditions of stress and strain and on Hooke's Law under the assumption of close contact between the layers. The algorithm described is suitable for a computer.Dedicated to RNDr. Jan Pícha, CSc., on his 60th Birthday  相似文献   

Electrical conductivity of rocks in the heating and cooling cycle     

Marcela Laštovičková  Reviewer F. Janák 《Studia Geophysica et Geodaetica》1978,22(2):184-189

Summary The values of the electrical conductivity, recorded during the heating and cooling cycle, of eclogites and basalts are compared. The observed difference in the values is explained by reversible and irreversible changes which take place in the samples.  相似文献   

On one method of solving the direct gravimetric problem     

Tibor Kolbenheyer  Reviewer V. Vyskočil 《Studia Geophysica et Geodaetica》1978,22(1):21-22

Summary The general solution of the direct gravimetric problem for homogeneous and inhomogeneous bodies was derived in[1] in the form of Green-type integrals. In the present paper it is proved that this solution simplifies considerably, if the solution of the external Dirichlet problem, defined by conditions(2), is known for a closed surface bounding the attracting body.Dedicated to RNDr Jan Pícha, CSc., on his 60th Birthday  相似文献   

To the problem of noise reduction in sea-level records used in vertical crustal movement detection     

Petr Vaníček 《Physics of the Earth and Planetary Interiors》1978,17(3):265-280

The aim of this investigation is to develop a simple technique that would allow us to use the sea-level records for detecting contemporary vertical crustal movements of duration from several months to several years. The choice of auxiliary data needed for any such analysis is restricted to the regularly available meteorological data to make this approach possible in routine search for precursory movements in earthquake-prone areas. A linear mathematical model is designed to evaluate the effect of atmospheric temperature and pressure variations, river discharge, long periodic tides and Chandlerian motion. Spectra of the residual sea-level variations are also shown. It is concluded that local episodic crustal movements of a magnitude larger than some 10 cm may be detectable by this approach. If finer resolution is needed then it it necessary to also account for steric level, wind, and sea-current variations, for which data are largely non-existent.  相似文献   

Measurements of stratospheric residence times     

Dr. Elmar R. Reiter  W. Carnuth  H. -J. Kanter  K. Pötzl  Dr. Reinhold Reiter  R. Sládkovič 《Meteorology and Atmospheric Physics》1975,24(1):41-51

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Magnetic properties of natural Mn-oxides     

Vladimír Kropáček  Miroslav Krs  Reviewer V. Bucha 《Studia Geophysica et Geodaetica》1975,19(3):261-274

Summary The paper is devoted to the study of the magnetic properties, of the volume magnetic susceptibility in a weak magnetic field, of the specific magnetic susceptibility in a strong magnetic field, of natural remanent magnetization and its stability in A.C. fields, and of the temperature dependence of magnetic susceptibility of natural Mn-oxides. Samples of pyrolusite, polianite, manganite, hausmannite, psilomelan and wad from different localities all over the world were studied; the measured values are statistically treated so that the given values are valid in general. Hausmannite displayed typical values of the magnetic susceptibility, different from the values of the other Mn-oxides. In general, many natural Mn-oxides contain heterogeneous admixtures of Fe-oxides, which are responsible for their ferromagnetic properties. A high degree of magnetic hardness, predetermining the minerals for palaeomagnetic research, was proved with many of the natural Mn-oxides.  相似文献   

Mathematical background for studying the stochastical properties of vector geophysical fields     

Ludmila Kubáčková  Reviewer M. Burda 《Studia Geophysica et Geodaetica》1975,19(4):313-321

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