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

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

  相似文献   

On the characteristics of vlf emissions in the upper ionosphere and on the ground     

František Jiříček  Pavel Tříska  V. E. Jurov  E. E. Titova  Reviewer S. Fischer 《Studia Geophysica et Geodaetica》1981,25(1):81-86

auuau uu muna a f>1,5 , aumua ¶rt; a nmua uu m u a ¶rt; a mau. mu a aum nm uu, umu a mauu aa (L=2,1) n¶rt; nm uu (L=5). m mmmum mu umua uu, umu a mu mau. au uu a nm m, m a um nmam a 2000–3000 u anu u a L=2,2–5,9. au mmmu nma aamumu a u nmu uu a¶rt;am u amu aua uu a L 3,5. aa, m a mauu aa u ¶rt;a a¶rt; nuu uu a , umum uuu n¶rt; a¶rt;a a nmu. au a n¶rt;num, m am a L 3,5,¶rt; aam au uu u au mmu nma aamumu a u nmu uu, aa ¶rt;amua anau a nana. m u m amu mm au anum u ¶rt; ¶rt;a ua n¶rt;u anmau u ¶rt; — ua.  相似文献   

Electric conductivity of young basaltic rocks of Central and South-East Slovakia     

Laštovičková  Marcela  Kropáček  Vladimír  Zátopek  A. 《Studia Geophysica et Geodaetica》1980,24(4):389-399

Summary The electric conductivity of basaltic rocks of the final volcanic phase of the Alpine-Carpathian orogenesis was studied in the temperature interval of 200–1000°C. The results obtained are compared with the chemical and modal composition of the rocks and with the content of trace elements (Cr, Co, Ni, V). The statistical treatment of a set of 11 rocks types indicated that the electric conductivity is mostly affected by the modal composition of the rock in the temperature interval of 200–600°C, whereas the effect of trace elements can be seen distinctly in the interval of 600–1000°C.  相似文献   

A new approximation of the velocity-depth distribution and its application to the computation of seismic wave fields     

Vlastislav Červený  Reviewer I. Pšenčík 《Studia Geophysica et Geodaetica》1980,24(1):17-27

Summary A new approximation of the velocity-depth distribution in a vertically inhomogeneous medium is suggested. This approximation guarantees the continuity of velocity and of its first and second derivatives and does not generate false low-velocity zones. It is very suitable for the computations of seismic wave fields in vertically inhomogeneous media by ray methods and its modifications, as it removes many false anomalies from the travel-time and amplitude-distance curves of seismic body waves. The ray integrals can be evaluated in a closed form; the resulting formulae for rays, travel times and geometrical spreading are very simple. They do not contain any transcendental functions (such asln (x) orsin ^–1, (x)) like other approximations; only the evaluation of one square root and of certain simple arithmetic expressions for each layer is required. From a computational point of view, the evaluation of ray integrals and of geometrical spreading is only slightly slower than for a system of homogeneous parallel layers and even faster than for a piece-wise linear approximation.  相似文献   

Seismic refraction problem in anisotropic media of the cretaceous plateau in czechoslovakia     

Karel Cidlinský  Reviewer I. Pšenčík 《Studia Geophysica et Geodaetica》1980,24(1):98-101

Summary Media with a distinct anisotropy make application of the refraction method for seismic exploration rather complicated. Velocity data obtained by seismic shooting, sonic log and laboratory measurements of borehole cores have been studied in the region of the Bohemian Cretaceous and interpretation problems of refraction have been analysed. Experience has shown that in such complicated anisotropic media the reflection method in the CDP modification has proved to be much more suitable.Paper was presented at the workshop meeting Seismic Waves in Laterally Inhomogeneous Media, Liblice 1978.  相似文献   

Radiation pattern ofP and Rayleigh waves for an experimental strike-slip fault model     

Ludvík Waniek  Jiří Vaněk  Reviewer K. Pěč 《Studia Geophysica et Geodaetica》1980,24(3):218-226

Summary The spatial radiation pattern of P and Rayleigh waves for microtremors, produced in a seismoactive source by a suitable modelling technique, was investigated. The results indicate that the source simulates a strike-slip fault of finite dimensions slipping along the fault plane.  相似文献   

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

a auauu m ma ¶rt;a a a amua aama m¶rt;, m n¶rt;m anau umu, u m nu¶rt;um ¶rt;a a nu mau am . m¶rt; nu a¶rt;u amu a ¶rt; mau aauu nu (nu, au, 27 , u uma, au, 29 ) mu 1967–1970 . m¶rt; n¶rt;mam ¶rt;a u, u aaua mam, m n¶rt;nmu a¶rt; m¶rt;am anau umua u am, u m umuu a m mnua. ¶rt;u u mam aaua m ma nuau ¶rt;u n u ma ¶rt;a a. anau um a u mau mu¶rt;a ¶rt; u u -ana¶rt;u anauu. au ¶rt;a u n¶rt;¶rt;uam aau m ¶rt;a u a¶rt;a a a amua a¶rt; n [15]. m, m mu¶rt;a um m m aa m anmauu ¶rt;u a¶rt;u, m a auum u ¶rt; anmau a¶rt;u u mau ¶rt;m (uu m m u), u ma m um a¶rt; m auauu anauu amu nu¶rt;u a¶rt;am ¶rt; ¶rt;a a.  相似文献   

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   

5α(H)-cholestan-3α-ol in sediments: Characterization and geochemical significance     

François Mermoud  Fazil O Gülaçar  Armand Buchs 《Geochimica et cosmochimica acta》1985,49(2):459-462

The top five centimeters of sediment collected at the deepest point of Lake Léman (Switzerland), 309 meters below water level, contain concentrations of 5α(H)-cholestan-3α-ol (epicholestanol) up to 10% of the total sterol content. Isobutane chemical ionization mass spectrometry and coinjection with an authentic standard on a SP-1000 glass capillary column were used in order to successfully characterize this epimer of cholestanol.The distribution of this stanol throughout the sediment core studied suggests in situ bacterial production. The change in concentration of epicholestanol with depth is different from those found for other C₂₇ stanols, such as cholestanol or coprostanol. It is probably the result of a change in the bacterial fauna in the most recently deposited sediment, related to the increasing eutrophication of the lake rather than the consequence of its lower stability due to the axial conformation of the OH substituent.  相似文献