Deep electrical structure under central Europe     

Oldřich Praus  Jana Pěčová 《Studia Geophysica et Geodaetica》1994,38(1):57-70

Summary The model of the electrical conductivity distribution within the Bohemian Massif to mid-upper mantle depths was derived from magnetotelluric and magnetic continuum long-period data of the Budkov Observatory (Geophysical Institute, Acad. Sci. Czech Republic., Prague) and from the ISL (Induction Scale Lengths) data of the Prhonice Observatory. The ranges of apparent resistivities in the Bohemian Massif (BM) are compared with those obtained at relevant central European observatories. The conductivity profile is estimated from the resistivity/depth graph corresponding to substitute perfect conductor inversion.Dedicated to the Memory of Professor Karel P  相似文献   

Percentile indices for assessing changes in heavy precipitation events     

Christoph Schär  Nikolina Ban  Erich M. Fischer  Jan Rajczak  Jürg Schmidli  Christoph Frei  Filippo Giorgi  Thomas R. Karl  Elizabeth J. Kendon  Albert M. G. Klein Tank  Paul A. O’Gorman  Jana Sillmann  Xuebin Zhang  Francis W. Zwiers 《Climatic change》2016,137(1-2):201-216

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Analysis of rainfall preceding debris flows on the Smědavská hora Mt., Jizerské hory Mts., Czech Republic     

Jana Smolíková  Jan Blahut  Vít Vilímek 《Landslides》2016,13(4):683-696

In August 2010, extreme rainfall affected the north of the Czech Republic and caused regional floods and landslides. Three torrential debris flows originated in the Jizerské hory Mts., close to Bílý Potok on the north slope of the Smědavská hora Mt. The rainfall situation which triggered the debris flow was analyzed and compared with the rainfall situation in 1958 when a debris flow occurred in the same area. The rainfall data were obtained from rain gauges of the Czech Hydrometeorological Institute. Four rain gauges were chosen close to the Smědavská hora Mt. with data of daily amounts from 1983 to 2013 and 10-min intensity or hourly amounts from the specific period. The data from 1958 were available from three different rain gauges (only daily amounts). The data series were not complete so linear regression was applied to interpolate them. A number of analyses were carried out including daily rainfall, 2-day/3-day moving values, antecedent precipitation index (API) of 5/10/30 days, 10-min intensity, and hourly amounts, and the trigger factor of the debris flow in the study area was also investigated. It was determined that for the triggering of debris flows, both high API values as well as high-intensity short-duration rainfall is needed. It was documented that in cases of solely high API indices or high-intensity short-duration rainfalls, no debris flows were initiated.  相似文献   

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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Anomalous induction in the Carpathians     

Jerzy Jankowski  Antoni Szymański  Karel Pěč  Václav Červ  Václav Petr  Jana Pěčová  Oldřich Praus  Reviewer M. Hvoždara 《Studia Geophysica et Geodaetica》1977,21(1):35-57

nuam mam uu auauaum n aumua ¶rt; a 9 n mau ¶rt; nu No V, na anam. ma uam a aa u¶rt;uu aau ¶rt; uu u mau anamau. m m u¶rt;uu u aauuaa amma aamumua aa ma. ¶rt;a a m¶rt; mau ¶rt; aumua u mm a¶rt;u n a m u mau. uamua aau ¶rt;m u mu ma, m m ¶rt;u u umu m n. maum aamumuu n nma mmuuu aauu aumau ¶rt; m ¶rt;- ¶rt;¶rt;muu mm ¶rt; nu u m¶rt; am.

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A substantial part of this paper was presented at the IAGA symposium Relations between External and Internal Magnetic Variations, XVI. IUGG General Assembly, August–September 1975, Grenoble.  相似文献   

Long period variations of the geomagnetic field and their spatial distribution in Europe     

Jana Pěčová  Oldřich Praus  Karel Pěč  Reviewer A Janáčková 《Studia Geophysica et Geodaetica》1977,21(2):148-158

a 27 nu amu ama m¶rt;au nma aaua ¶rt; nu nma anum¶rt; 27-¶rt; auauu u ÿeau nu¶rt;au 13–14 u 9 ¶rt;. mam an¶rt;u nma anum¶rt; Z u H mau a n nuuuu auauuu uuP ₁ (cos ) u P ₁ /, mmm. mau mau a um auumu mau auau ¶rt; mmu mu Z/H ¶rt; a¶rt; amuu. au ¶rt; mmuuu u umu a¶rt;au muu ¶rt; ¶rt;am uau mu ¶rt;¶rt;mmu mu u. a aaua au mu Z/H ¶rt;m u uam n u m aa amu.  相似文献   

Estimates of the Population Size of Certain Groups of Bacteria in Two Water Bodies During the Solar Eclipse     

B. B. Jana  U. K. De  G. N. Patel 《洁净——土壤、空气、水》1981,9(5):593-598

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Environmental factors affecting the seasonal changes of net plankton in two tropical fish ponds in India     

B. B. Jana  U. K. De  R. N. Das 《Aquatic Sciences - Research Across Boundaries》1980,42(2):225-246

Estimates of population size and biomass of net plankton were made in two tropical fish ponds in relation to the ecological data over a period of one year. There was a wide spatial and seasonal variation of population size and biomass of net plankton in two ponds studied. Always predominant over zooplankton, phytoplankton demonstrated three distinct annual peaks in the pond N-1 while a single peak was obtained in the pond N-2. A variable result was found in two ponds in the values of Shannon index of general diversity for phyto- and zooplankton. The seasonal changes of phytoplankton number in these ponds showed an inverse characteristic either with absolute concentration or with the rate of concentration changes of bicarbonate in the water, while the former and concentration of dissolved oxygen was positively correlated. In the multiple correlation analysis, the greatest importance of the concentration of PO₄ was indicated on the phytoplankton population as HCO ₃ ⁻ and dissolved oxygen were not considered to be included in the final regression formula in both the ponds studied but the rate of changes of HCO ₃ ⁻ , PO₄ and dissolved oxygen were influential on phytoplankton in the pond N-1.  相似文献   

New Bathonian (Middle Jurassic) ammonite assemblages from Kutch, India     

Pinaki Roy  Subhendu Bardhan  Aparajita Mitra  Sudipta K. Jana 《Journal of Asian Earth Sciences》2007,30(5-6):629-651

The Bathonian ammonite assemblages have been previously poorly recorded in Kutch. The present study has unearthed a rich array of ammonite taxa ranging from the Middle to Upper Bathonian. While Oxycerites Rollier (1909) is a new record from Kutch, the oldest occurrence of Choffatia Siemiradzki (1898) has been found from the Middle Bathonian horizon. Oxycerites cf. orbis (Giebel) is a zonal index of the Late Bathonian in other areas and thus facilitates interprovincial correlation. Besides, palaeobiogeographic and stratigraphic distribution of many species have been modified based on new information. For example, macrocephalitin species, i.e., Kamptokephalites cf. etheridgei Spath (1928), Macrocephalites bifurcatus transient intermedius Spath (1928), M. cf. mantataranus Boehm (1912) were previously known from West Pacific, Indonesia have been now found in Kutch. Gracilisphinctes Buckman (1920) has been previously known to occur during the Middle Bathonian time, the present work extends its stratigraphic distribution up to the definite Upper Bathonian horizon. Procerites hians (Waagen) an endemic species in Kutch previously known from the Upper Bathonian beds, its stratigraphic range has been extended down to the Middle Bathonian.Detail taxonomy of the newly obtained taxa has been done and in many cases sexual dimorphism has been recognized.  相似文献   

knowledge base model for evaluation of bio-physical tendency of dryland     

Jana  R  Khire  M V 《地理学报(英文版)》2004,14(1):25-31

The present study aims the evaluation of bio-physical characteristics towards soil-water-vegetation stress and a rule is envisaged to assess the degree of temporal changes. The digital rule for assessment is initialized through the index of land Instability (ILI) where the variance indicates the temporal instability of the pixel i.e., smallest land unit. It is assumed that the biophysical characteristic of land is in command of land-dynamics where there is no change in Land Use/Land Cover (LU&;LC). The intensity map on tendency of albedo (IALB) assesses the intensity of soil erosion and water stress whereas intensity map on tendency of NDVI (INDVI) appraises the stress on vegetation. The carry-out study covers a part of semiarid Western India. Primarily remote sensing technique, which carries the digital information of land temporally and spatially, is adopted in this paper. A part of the study area is represented using two sets of IRS 1A/1B LISS-I data of March with a decadal time domain (1989–1998) as a test area. It is assumed that the soil-water-vegetation stress is maximum during summer (March–April–May) in any tropical belt and decadal data will stretch the possibility of climate as well as man-made activity over the land.  相似文献