Über die Überlagerungsgeschwindigkeit der Fronten     

M. Čadež 《Pure and Applied Geophysics》1960,45(1):227-237

Summary One can find that over the continent the cold fronts becomes stationary after the sunrise. In the present paper this phenomen is explaned by heating of cold air what causes the increase of the slope of the boundary surface. Because of surface heating of the cold air the horizontal pressure gradient in direction toward the front increases with time, and so increases the transport of the cold air in this direction too. The increasing of the slope of boundary surface that is in connection with the mentioned increased trasport of cold air, causes the convergence of air mass and the ascent of it at the same front (Fig. 2).As the consequence of the heating from the surface and the liberation of latent heat of vaporisation, the volume of cold air increases. In connection with this the divergence of mass occures in the high levels and later one can find at the surface the corresponding fall of pressure. This effects can cause in suitable cases the development of cyclon, similarily as shown on Fig. 4. When the cold air comes from the cold continent over a relatively warm sea surface, the strong heating of cold air occurs and as consequence of this, the cyclogenesis.  相似文献   

Way of flying based on compressibility of fluids     

Marjan Čadež 《Pure and Applied Geophysics》1972,93(1):187-190

Summary The forces due to compressibility of a fluid and their action on moving bodies have been studied. Also a possible practical application of these forces in a propulsion mechanism for vehicles has been discussed.

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Zusammenfassung Im vorliegenden Beitrag wird die Wirkung der Kräfte auf bewegende Körper, die durch Kompressibilität des Mediums bedingt sind, untersucht. Es wird über die Möglichkeit der Konstruktion eines Mechanismus auf diesem Prinzip diskutiert.

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An attempt at energy index (EI) analysis of the Upper Anisian,Ladinian and Carnian carbonate rocks in the Teteven anticlinorium (Bulgaria)     

George A. Čatalov 《Sedimentary Geology》1972

Two sections of Triassic carbonate rocks were investigated by means of energy-index logs (EI logs). Three more terms are applied here in addition to the well-known terminology: EI log of the energy minima (EI log_min), EI log of the energy maxima (EI log_max) and differential EI field (DEI field). Characteristics of the EI classification parameters for the Upper Anisian, Ladinian and Carnian carbonate rocks are provided. Their EI classification comprises four types and twelve subtypes of limestones. The application of this classification established eight complete energy cycles (according to the scale chosen). The comparison of the EI logs of the two sections showed certain differences only in the detailed configuration of the cycles. This is due to lateral alternations in the beds. The general energy evolution trend of the two sections is identical. The dolomite formation during the Norian was preceded by rapid lowering of the energy levels in the upper part of the Carnian. The ostracods and foraminifers are related to the lowest energy levels, whereas the crinoids, brachiopods, bryozoans and thickshelled pelecypods are related to the medium and high energy levels.  相似文献   

A green lead-containing orthoclase     

Dr. F. Čech  Dr. Z. Mísař  Dr. P. Povondra 《Mineralogy and Petrology》1971,15(3):213-231

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A comparative study of geothermal and meteorological records of climate change in Kamchatka     

V. Čermák  J. Šafanda  L. Bodri  M. Yamano  E. Gordeev 《Studia Geophysica et Geodaetica》2006,50(4):675-695

To reconstruct the recent climate history in Kamchatka, a series of repeated precise temperature logs were performed in a number of boreholes located in a broad east-west strip (between 52 and 54°N) in the central part of Kamchatka west of Petropavlovsk-Kamchatski. Within three years more than 30 temperature logs were performed in 10 holes (one up to six logs per hole) to the depth of up to 400 metres. Measured temperature gradients varied in a broad interval 0 to 60 mK/m and in some holes a sizeable variation in the subsurface temperatures due to advective heat transport by underground water was observed. Measured data were compared with older temperature profiles obtained in the early eighties by Sugrobov and Yanovsky (1993). Even when older data are of poorer precision (accuracy of about 0.1 K), they presented valuable information of the subsurface temperature conditions existing 20–25 years ago. Borehole observations and the inverted ground surface temperature histories (GSTHs) used for the paleoclimate reconstruction were complemented with a detailed survey of meteorological data. Namely, the long-term surface air temperature (SAT) and precipitation records from Petropavlovsk station (in operation since 1890) were used together with similar data from a number of local subsidiary meteo-stations operating in Central Kamchatka since 1950. Regardless of extreme complexity of the local meteorological/climate conditions, diversity of borehole sites and calibration of measuring devices used during the whole campaign, the results of the climate reconstruction supported a general warming of about 1 K characteristic for the 20th century, which followed an inexpressive cooler period typical for the most of the 19th century. In the last three to four decades the warming rate has been locally increasing up to 0.02 K/year. It was also shown that the snow cover played a dominant role in the penetration of the climate “signal” to depth and could considerably smooth down the subsurface response to the changes occurred on the surface.  相似文献   

Crustal thermal models for South Siberia     

L. S. Sokolova  A. D. Duchkov  Reviewer V. Čermák 《Studia Geophysica et Geodaetica》1978,22(2):200-207

Summary The results of geothermal research carried out in South Siberia (West-Siberian and Siberian Platforms, Altai-Sayan folded area and the Baikalian arched uplift zone) were employed to calculate the Earth's crustal temperatures. It is shown that temperature is a function of the heat flow value. The maps of the surface heat flow and the temperatures at the Moho discontinuity are presented and characteristic temperature-depth profiles were compiled for specific tectonic areas. The West-Siberian and Siberian Platforms, as well as the Altai-Sayan folded region are characterized by rather low heat flow, 42–50mW m ^–2 (1.0–1.2 µcal/cm ² s), and low temperatures at the Moho boundary.400–500 °C. The thermal conditions in the area of Lake Baikal are extreme, the heat flow reaches here100–142 mW m ^–2 (2.4–3.4 µcal/cm ² s), and the temperature at the crust's bottom may exceed1000 °C. The Moho-surface according to our calculations is nonisothermal.  相似文献   

Numerical modelling in laterally inhomogeneous geoelectrical structures   总被引：2，自引：0，他引：2  

Václav Červ  Oldřich Praus  Reviewer M. Hvoždara 《Studia Geophysica et Geodaetica》1978,22(1):74-81

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Dedicated to RNDr. Jan Pícha, CSc., on his 60th Birthday  相似文献   

Numerical properties of low-frequency expansions for the reflection and transmission coefficients from transition layers     

Oldřich Novotný  Vlastislav Červený  L. A. Molotkov  Reviewer I. Pšenčík 《Studia Geophysica et Geodaetica》1980,24(2):124-130

Summary The numerical properties of the low-frequency expansions for the reflection and transmission coefficients of SH-waves from transition layers, derived in [1], are studied. It is shown that the expansions are suitable for computations only when the thickness d of the transition layer is small in comparison with the wavelength of the incident wave (d0.5). For thicker transition layers, certain modifications of the method are suggested.  相似文献   

Masses d'air conditionnées par la fonte des neiges     

Par Marjan Čadež 《Pure and Applied Geophysics》1965,61(1):232-245

Summary In the paper it is shown in which manner the cooling of the air due to the melting of snowflakes causes the appearance of special air masses of greater or smaller dimensions. Here some examples are given of the formation of such air masses of melting in Yugoslavia on the north slopes of the Dinarian Alps.

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Zusammenfassung In dieser Arbeit ist gezeigt, auf welche Weise die Abkühlung der Luft, die durch das Schmelzen der Schneeflocken bedingt ist, besondere Luftmassen von grösseren und kleineren Ausdehnungen zur Folge hat. Es sind einige Beispiele von solchen Luftmassen des Schmelzens in Jugoslawien gegeben, die auf der Nordseite der dynarischen Gebirge formiert sind.

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Approximate expression for the hilbert transform of a certain class of functions and their application to the ray theory of seismic waves     

Vlastislav Červený  Reviewer J. Vaněk 《Studia Geophysica et Geodaetica》1976,20(2):125-132

Summary Approximate expressions for the Hilbert transform of the functionf(t)=exp(- ₀ ² t ²/²) cos( ₀ t+v) are determined. This function, given a suitable choice of the three parameters ₀, and v, approximates a wide class of seismic signals very well. The approximate expressions for the Hilbert transform enable very simple formulae to be given for the elementary seismograms of the individual seismic body waves (in the zero approximation of the ray theory). This accelerates the computation of ray theoretical seismograms considerably.  相似文献