Auroral and archaeomagnetic variations in the past     

František Link 《Studia Geophysica et Geodaetica》1969,13(1):90-93

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Sur la couche absorbante élevée observée par glenn pendant le vol spatial mercury-atlas-6     

Link  Frantiŝek 《Studia Geophysica et Geodaetica》1963,7(1):38-44

Studia Geophysica et Geodaetica - Нафняодения высокого...  相似文献   

On the detection of weak strain parallel to the bedding by magnetic anisotropy: A mathematical model study   总被引：2，自引：0，他引：2  

František Hrouda  Lenka Hrušková 《Studia Geophysica et Geodaetica》1990,34(4):327-341

Summary Five mathematical models of the superposition of deformational magnetic fabric on sedimentary magnetic fabric are presented. These models are represented by various combinations of pure shear and simple shear. The diagrams of the variations in the main magnetic anisotropy parameters with strain can help in recognizing weak ductile deformation in sedimentary rocks.

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Реэюме Пруво?rt;umся nяmь мamемamuческuх мо?rt;елеŭ суnерnозuцuu ?rt;еформaцuонноŭ мa?rt;нumноŭ mексmуры на осa?rt;очноŭ мa?rt;нumноŭ mексmуре. Мо?rt;елu ире?rt;сmвaлены в рaзных комбuнaцuях чuсmо?rt;о с?rt;вu?rt;а ц иросmо?rt;о с?rt;вu?rt;а. Дua?rt;раaммы вaрuaцuŭ в ?rt;лaвных naрaмеmрaх мa?rt;нumноŭ aнuзоmроnuu с ?rt;еформaцuеŭ мо?rt;уm nомочь nрu рaсnознaвaнuu слaбых nлaсmuчных ?rt;еформaцŭŭ в осa?rt;очных nоро?rt;aх.

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Deuteron whistlers in the outer ionosphere     

Jaroslava Bošková  František Jiříček  Reviewer S. Fischer 《Studia Geophysica et Geodaetica》1986,30(2):196-205

Summary Upgoing and downgoing deuteron whistlers were found on VLF records made by Interkosmos 5, 14 and 19 satellites even at heights below 1000 km. To account for them, a slight admixture ofD ⁺ ions has been introduced into the ionospheric plasma model with the usual content of only three ion speciesH ⁺,He ⁺ andO ⁺. Relations derived for the calculation of characteristic frequencies in a five-component plasma (e,H ⁺,D ⁺,He ⁺,O ⁺) are given as well as the values of characteristic frequencies calculated on this basis. The observed features of upgoing and downgoing deuteron whistlers could be explained by the calculation results, and it is also possible to formulate some conclusions for the purposes of plasma diagnostics.

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mu um, anmau a ma u u, u a a nmua m 5, 14 u 19 a ma ¶rt;a 1000 . u u a ¶rt;a ¶rt; u na ¶rt;au uH ⁺,He ⁺,O ⁺ aa nuD ⁺ u. m mm ua nma ¶rt;a ¶rt; aamumuu amm ¶rt;a ¶rt;u na. uu aamumuu amm nuu um a¶rt;a mu ¶rt;mu um. a m ¶rt; unam aamumuu ¶rt;mu um ¶rt; u¶rt;au naam na.

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Transfer impedance of a probe in a drifting plasma     

Vladimŕ Fiala  František Blahák  Reviewer G. Siráň 《Studia Geophysica et Geodaetica》1984,28(2):178-187

au un¶rt;a umu ¶rt;a na nu nauuu ¶rt;a uam mmu amm na aa. amau aa auum m mnam u mu ¶rt;a, m unam ¶rt; ¶rt;uamuu u na.  相似文献   

Role of single-domain magnetic particles in creation of inverse magnetic fabrics in volcanic rocks: A mathematical model study     

František Hrouda  Josef Ježek 《Studia Geophysica et Geodaetica》2017,61(1):145-161

The role of single-domain (SD) magnetic particles in creation of inverse magnetic fabrics is investigated on simple mathematical models using a realistic estimate for SD intrinsic susceptibility. In contrast to the fraction created by multi-domain (MD) particles, in which the anisotropy of magnetic susceptibility (AMS) is controlled by both the grain AMS and intensity of the preferred orientation of the particles, the AMS of the SD fraction is controlled solely by the intensity of the preferred orientation. The degree of AMS of ensemble of SD grains with a preferred orientation is therefore much higher than that of the same ensemble of MD particles implying the existence of frequent inverse magnetic fabrics. However, the occurrence of inverse magnetic fabrics due to SD particles is more the exception than the rule. Consequently, the amounts of SD particles is probably in general low. Nevertheless, the presence of SD particles in amounts insufficient to create inverse magnetic fabrics may diminish the whole rock AMS substantially. This can be one of the reasons for relatively low AMS in volcanic rocks whose magnetic particles may be really small obeying the conditions for the existence of SD particles.  相似文献   

Preferential percolation quantified by large water content sensors with artifactual macroporous envelopes          下载免费PDF全文

Ilse Kogelbauer  Kamila Bát'ková  František Doležal  Svatopluk Matula  Willibald Loiskandl 《水文研究》2015,29(19):4325-4338

For many scientific and practical tasks, it is important to estimate the soil–water percolation fluxes. This paper builds on measurements with large horizontal time‐domain reflectometry water content sensors in a loamy Mollisol. The sensors were installed into pre‐drilled holes and the gaps between them, and the soil was filled with a slurry of local soil with water. This gave rise to envelopes around them that contained artificial macropores. The sensors reacted to intensive rains by a rapid increase of their readings, often above the native soil's porosity, followed by an almost equally rapid decrease. The paper explores the feasibility of quantifying the rapid percolation, based on these anomalous water content peaks, and demonstrates that this is possible in principle, if the processes are simulated by a suitable model. A two‐dimensional dual porosity non‐equilibrium (mobile‐immobile) model was tried. The envelope around the sensor was modelled as an annulus with higher porosity and hydraulic conductivity, which attracts preferential flow and amplifies the percolation signal. With the model at hand, the flux hydrographs can be derived from model simulations and measured precipitation. For contrast, the Durner equilibrium dual porosity model was tried but was found little suitable. However, even the mobile‐immobile model did not perform perfectly. Simulated water contents were similar to the measured ones at some depths but not in the others, and the percolation fluxes were overestimated, compared to cumulative soil–water balance. Efforts to improve model performance were not successful. Hence, the model structure needs to be improved. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

Mineralogy,alteration patterns,geochemistry, and fluid properties of the Ag-Au epithermal deposit Nová Baňa,Slovakia     

Majzlan  Juraj  Berkh  Khulan  Kiefer  Stefan  Koděra  Peter  Fallick  Anthony E.  Chovan  Martin  Bakos  František  Biroň  Adrián  Ferenc  Štefan  Lexa  Jaroslav 《Mineralogy and Petrology》2018,112(1):1-23

Mineralogy and Petrology - In this contribution, we report new data on mineralogy, alteration patterns, geochemistry, fluid properties and source of fluids for the deposit Nová Baňa, one...  相似文献   

Emissions de la haute atmosphère pendant le crépuscule I. Méthode de recherches     

Frantiŝek Link 《Studia Geophysica et Geodaetica》1958,2(4):345-352

Резюме В работе приводится описание метода интерпретации фотоэлектрических измерений ясности сумеречного неба в эмиссионном и сравнительном диапазонах. ФормулЫ для редукций, основаннЫе на теории сумеречнЫх явлений автора работЫ, позволяют вЫчислить эмиссию вЫсотной атмосферЫ от депрессии примерно 9° до начала астрономической ночи. Применение метода показано на измерениях, осуществленнЫх во второй половине 1957 г. на Ломницком Щите (2634 μ) по программе МГГ.

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Adresse: Praha XII, Budeĉská 6.  相似文献   

Indices for Numerical Characterization of the Alteration Processes of Magnetic Minerals Taking Place During Investigation of Temperature Variation of Magnetic Susceptibility   总被引：1，自引：0，他引：1  

Hrouda  František 《Studia Geophysica et Geodaetica》2003,47(4):847-861

The alteration of magnetic minerals taking place during the investigation of the temperature variation of bulk magnetic susceptibility is obvious from different courses of heating and cooling susceptibility vs. temperature curves. A set of indices is introduced to characterize these changes numerically. The A ₄₀ alteration index characterizes the change in susceptibility after executing the whole cycle of heating and cooling. The maximum difference between the heating and cooling curves is characterized by the A _max alteration index. The mean or average difference between the heating and cooling curves is characterized by the A _m alteration index. The situation whether the heating and cooling curves cross, is characterized by the A _cr alteration index. The technique of progressive repeated heating is proposed, together with the above indices, to locate the temperature intervals with weak and strong magnetic mineral changes induced by heating.  相似文献