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292. Mapping the thickness of quaternary sediments in the Iška alluvial fan (Central Slovenia) using microtremor method
- Creator:
- Rupar, Lovro and Gosar, Andrej
- Format:
- print, bez média, and svazek
- Type:
- model:article and TEXT
- Subject:
- geodynamika, geodynamics, Slovinsko, Slovenia, microtremor method, sediments resonance frequency, frequency-thickness relationship, mapping sediment thickness, Iška alluvial fan, Ljubljana Moor, 7, and 551
- Language:
- English
- Description:
- Resonance frequencies of unconsolidated sediments of the Iška alluvial fan (Ljubljana Moor basin) were derived using microtremor method. Free-field measurements were conducted in a grid with point spacing of approximately 250 m. The sediments frequency-thickness relationship, h = 202.97 f -1.139, was obtained on the basis of 107 microtremor measurements, six existing boreholes that reached the Pre-Quaternary basement and two seismic reflection profiles. The reliance of the obtained relationship was evaluated with the R2 coefficient, which shows a very good level of determination. The resonance frequency map reveals the existence of an N-S oriented deeper buried valley (maximum depth 119 m) in the Western part of the alluvial fan. The microtremor HVSR amplitude map does not show any specific spatial distribution pattern, with the exception of a relatively narrow band of low amplitudes located north of Iška vas. This is probably related to an area of severely fractured bedrock along the Mišji Dol fault. Map of the Quaternary sediment thickness and map of the Pre-Quaternary basement topography were constructed on the basis of the established relationship. The basement topography map shows rather steep western slopes of the buried valley down to deepest part, followed by a gradually ascending basement towards the Eastern part of the fan. The comparison of the obtained parameters a and b in frequency-thickness relationship with other sedimentary basins around the world reveals a small variation of b values, and a rather large range of a values, which implies that the parameter a is characteristic for certain geological areas. The results of this research will find use in constructing more accurate hydrogeological models and for assessment of possible sediments-structure resonance effects in seismic microzonation., Lovro Rupar and Andrej Gosar., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
293. Maps of Old London
- Creator:
- Mitton, G. E. (Geraldine Edith), Van Den Wijngaerde, Antonie, Agas, Ralph, Hoefnagel, Joris, Norden, John, Faithorne, William, Newcourt, Richard, Ogilby, John, Rocque, John, and Besant, Walter
- Publisher:
- Adam and Charles Black
- Format:
- print and 27 s., 10 obr. příl. : il., mp., plány.
- Type:
- model:monograph and TEXT
- Subject:
- Mapy. Atlasy. Glóby, plány měst, historická geografie, Londýn (Anglie), 7, and 912
- Language:
- English
- Description:
- by G.E. Mitton.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
294. Material properties of FRC with recycled aggregate
- Creator:
- Jiřina Trčková and Petr Procházka
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, smykové zkoušky, shear tests, effect of number of fibers, recycled aggregate, concrete composite, pullout test, 7, and 551
- Language:
- English
- Description:
- The sustainable ecology belongs to the most important issues today. In this field a use of recycled materials is of great interest to people. Consequently, incorporation of industrial waste, concrete and brick scraps and other rubbish into products for civil engineering use is very important. Certain results from experiments carried out in laboratory on standard samples are emerged in this paper. Since the material is not yet enough approved, three main targets are addressed. The first involves the behaviour of fiber reinforced concrete based on aggregates from various recycled material. Then the influence of distance among two or more fibers is observed. For completeness the results from shear tests are presented in the end of this paper., Jiřina Trčková and Petr Procházka., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
295. Mathematical modelling of thermal state in underground mining
- Creator:
- Navarro Torres, Vidal F., Da Gama, C. Dinis, and Singh, Raghu N.
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, hlubinné dobývání, underground mining, geothermal gradient, rock mass thermal properties, human comfort, underground mining environment, 7, and 551
- Language:
- English
- Description:
- The effect of temperature in underground mines is related to the geothermal gradients of rocks overlying the mining excavation. This may exceed the standards of comfort for human beings to work in an underground environment thus causing thermal discomforts and associated risk. In order to evaluate the influence of high ventilation temperatures on mine workers a mathematical model has been developed based upon the concept of heat transfer from the rock mass to the air flow in the underground environment. This model has been validated in the Noves Corvo underground copper mine, Portugal., Vidal F. Navarro Torres, C. Dinis Da Gama and Raghu N. Singh., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
296. Measurement of P- and S-wave velocities in a rock massif and its use in estimating elastic moduli
- Creator:
- Roman Živor, Vilhelm, Jan, Rudajev, Vladimír, and Lokajíček, Tomáš
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, seizmicita, seismicity, piezo-electric transducer, seismic source, seismic waves velocity, elastic constants, geophone, 7, and 551
- Language:
- English
- Description:
- The research in question deals with problems of determining seismic P- and S-wave velocities for purposes of computing the elastic constants of a rock massif. This experimental study indicates various ways of measurement and its processing for different geological conditions. The experimental measurements were carried out on the surface of the studied rock massif, on the walls in workings, as well as on the surface in a quarry. The question of seismic pick-ups, geophones or piezo-electric transducers and the number of components required to identify P- and S-waves, is discussed. This is considered in connection with the choice and properties of the impact or piezo-electric seismic source. The result is a number of generalizing recommendations with respect to the measuring technique, inclusive of its use for determining the directional dependence of the elastic moduli., Roman Živor, Jan Vilhelm, Vladimír Rudajev and Tomáš Lokajíček., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
297. Mechanical behavior of polysiloxane matrix: based composite reinforced with basalt fibres at elevated temperatures
- Creator:
- Černý, Martin, Sucharda, Zbyněk, and Petr Glogar
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, kompozitní materiály, mechanické vlastnosti materiálů, composite materials, mechanical properties of materials, basalt fibres, 7, and 551
- Language:
- English
- Description:
- Martin Černý, Zbyněk Sucharda and Petr Glogar. and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
298. Mechanism of rigid overlaying of carboniferous strata failure in face mining in the case of a multiseams deposit
- Creator:
- Eva Jiránková, Staš, Lubomír, Vlastimil Kajzar, and Doležalová, Hana
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, geodynamika, geodynamics, tensor stress measurement, longwall mining, subsidence trough, rock mass, overlying strata, 7, and 551
- Language:
- English
- Description:
- The technique of assessing the failure of rigid overlying strata is applicable to deep mining with thick coal seams (a thickness of more than 1 m in the Ostrava-Karvina Coalfield), and in one case to longwall mining with controlled caving. The assessment of failure of rigid overlying strata makes it possible to distinguish whether the rigid overlying strata of rocks has been deformed or whether a strutting arch has been formed over the goaf below which is an area that is free from stress. Good knowledge of the mining, technical and geological conditions of a given site is a prerequisite for successful evaluation. There are advantages to utilising surface measurements for interpreting the effects of changes in rock mass, especially in areas of high overlying strata. The practical importance of failure assessment of overlying strata consists in determining the size of the mined-out area where the deformation of the rigid overlying strata occurred, which is dependent on the character of the rock mass. This paper is set in the context of the expected width of the goaf during deformation of rigid overlying strata within parameters that describe the mining and geological conditions of the locality. Changes in the area of the goaf, based the results of tensometric measurements, will also be placed in context., Eva Jiránková, Lubomír Staš, Vlastimil Kajzar and Hana Doležalová., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
299. Mesoscale functions of GPS slant delay
- Creator:
- Figurski, Mariusz, Kroszczyński, Krzysztof, Kamiński, Paweł, and Gałuszkiewicz, Marcin
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, GPS sítě, GPS netwoks, GPS stations, velocity, wavelets, wavelet decomposition, symlet, signal trend, multiresolution signal decomposition, 7, and 551
- Language:
- English
- Description:
- The aim of this paper is to show time-de pendent baseline variation between GPS stations situated in South-East Poland. This study was based on daily data analysis of selected GPS stations: WROC, GOPE, MOPI, KRAW and KATO. The start date o f the analysis is linked at every station with the beginning of its operation and the closing date of the operation is in 2006. The multiresolution signal decomposition method has been used to analyze the periodic terms of the time series of the above. The estimated trends enable further coordinate analysis as well as determination of site displacements at the study area., Mariusz Figurski, Krzysztof Kroszczyński, Paweł Kamiński and Marcin Gałuszkiewicz., and Obsahuje bibliografické odkazy
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
300. Michael Borovička, Velké dějiny zemí Koruny české. Tematická řada. Cestovatelství
- Creator:
- Jaroslav Svátek
- Format:
- Type:
- model:article and TEXT
- Subject:
- dějiny cestování, cestovatelé, history of travelling, travellers, Česko, Czechia, 7, and 91
- Language:
- Czech
- Description:
- [autor recenze] Jaroslav Svátek.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public