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20832. Sezonnost tropického deštného lesa z ptačí perspektivy

Creator:
Zenklová, Tereza
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Biologické vědy, tropické deštné lesy, ptáci, tropical rain forests, birds, 2, and 57/59
Language:
Czech
Description:
V naší studii se zabýváme zpěvní a hnízdní aktivitou ptáků v tropickém deštném lese Kamerunské hory v západní Africe. Ukázali jsme, že toto na první pohled stálé prostředí vykazuje výraznou sezonalitu v množství srážek ovlivňujících dostupnost potravy. Důsledkem je variabilní sezónní aktivita ptačího společenstva, zejména různých potravních guild. Sezonalita prostředí i ptačího společenstva se mění také s nadmořskou výškou., The aim of our study, conducted in the Re­public of Cameroon (Africa), was to examine the singing and breeding activity of birds in a tropical rain forest. We have shown that this otherwise stable environment exhibits a distinct seasonality in rainfall, resulting in seasonal activity of bird communities, especially of various feeding guilds. Seasonality of environment and breeding of bird communities also changed with the altitude (tested on the Mount Cameroon - Mongo ma Ndemi)., Tereza Zenklová a kolektiv autorů., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

20834. Shadows over Shulamith: Giordano Bruno´s De umbris idearum and the Song of Songs

Creator:
Sergius Kodera
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
teorie vědy, theory of science, Giordano Bruno, biblická exegeze, Origénes, umění paměti, filosofická antropologie, biblical exegesis, Origen, art of memory, philosophical anthropology, 12, and 00
Language:
Czech
Description:
Článek pojednává o jednom verši z biblické Písně písní (2,3) v jedné z ústředních pasáží první publikované knihy Giordana Bruna, která pojednává o umění paměti. De umbris idearum [O stínech idejí] neusiluje jen o zlepšení paměťových schopností, ale předjímá také podmínky a hranice poznání v Brunové nové infinitní kosmologii. Tento příspěvek vychází z relevantní sekundární literatury k tomuto tématu a představuje De umbris obecně v kontextu Brunovy filosofie. Soustředí se na Brunovo napodobování Origénova komentáře k této pasáži z Písně písní. Článek detailně analyzuje důvody Brunovy subverze tradiční exegetické tradice, která byla výrazně ovlivněna Origénovým spiritualizovaným čtením Písně písní. Brunovo zcizení Origénova komentáře se nakonec ukazuje jako mise en abyme, manýristická strategie reprezentace. Ta jen odráží vlastní metodu, která tvoří základ Brunova umění paměti, ale která se dá chápat také jako vědomé rozvracení exegetických tradic obecně., This article focuses on the use of one verse from the Biblical Songs of Songs (2. 3) in central passages of Giordano Bruno’s first published book on the art of memory. De umbris idearum [On the Shadows of Ideas] not solely aims at improving mnemonic capacities, it also envisages the preconditions and limits of cognition in Bruno’s new inifitist cosmology. Taking relevant scholarly literature on the topic as a point of departure, this contribution presents De umbris in the context of Bruno’s philosophy in general; it focuses on Bruno’s evocation of Origen’s commentary on that passage in the Song of Songs. The article analyzes in detail the reasons for Bruno’s subversion of the traditional exegetic tradition that was massively influenced by Origen’s spiritualized reading of the Song of Songs. Bruno’s misappropriation of the Origen’s commentary turns out to be a mise en abyme, a mannerist strategy of representation. It not only reflects the very method that underlies Bruno’s art of memory, but is also to be understood as a conscious subversion of exegetic traditions in general., and Sergius Kodera.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

20836. Shallow crustal structure of the Central Bohemian Pluton, Czech Republic, inferred from refraction measurements

Creator:
Málek, Jiří, Oldřich Novotný, and Žanda, Libor
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Geologie. Meteorologie. Klimatologie, geodynamika, geodynamics, Central Bohemian Pluton, shallow structure, refraction method, Wiechert-Herglotz method, 7, and 551
Language:
English
Description:
Since 1998, a seismic network has been monitoring the underground gas storage located near the town of Příbram in the Central Bohemian Pluton, Czech Republic. Hundreds of weak induced seismic events have been recorded there. Moreover, several weak earthquakes have also been recorded from the vicinity of the nearby Orlík water reservoir. To improve location of both types of seismic events, shallow crustal structure of the region is studied in the present paper. Refraction measurements to distances of about 20 km were carried out using quarry blasts as seismic sources. Smoothed P-wave travel times were interpreted using the Wiechert-Herglotz method, which yielded a 1-D velocity model of shallow crustal structure down to a depth of about 1.7 km. The P-wave velocity of the model increases from about 5.0 km/s at the surface to about 6.15 km/s at the 1.7 km depth., Jiří Málek, Oldřich Novotný and Libor Žanda., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

20838. Shape optimization of fibers in FRC

Creator:
Petr Procházka and Martin Válek
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Geologie. Meteorologie. Klimatologie, vláknobeton, fiber reinforced concrete, fiber shape optimization, composites, constrained volume (area), 7, and 551
Language:
English
Description:
In this study shape optimization of fibers in composite fiber reinforced structure is presented. The problem targets the optimal shape with respect to the maximum bearing capacity and the minimum deformation of the whole composite set up. The shape is constrained by a constant volume (area) ratio. The optimization includes a process of seeking the overall properties of composites, i.e. localization and homogenization. Since no a priori estimate of the shape of fibers is known, numerical tool, finite element method, is employed. Such a problem is important in a wide range of applications, prevailingly in fiber reinforced concrete assessment, biomechanics, biophysics, and in the mechanics of classical composites with epoxy matrix. Since many types of fibers are used in various fiber reinforced concretes (fibers from polypropylene, steel, glass, clay, basalt, hemp, etc.), a deeper study is of importance to engineers and researchers. Application on FRC is preferred, i.e. fiber volume ratio is small, while classical composites require relatively very high volume ratio. The theory involves an original procedure leading to the optimal shape of fibers; it is then applied in the form of a numerical study. Also two examples from experiments verify the theoretical results. The problems are solved as two-dimensional, i.e. a unidirectional distribution of fibers is supposed., Petr P. Procházka and Martin Válek., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

20839. Shear wave velocities inferred from surface wave dispersion beneath the Příbram array in the Czech Republic

Creator:
Gaždová, Renata, Kolínský, Petr, Málek, Jiří, and Vilhelm, Jan
Format:
print, bez média, and svazek
Type:
article, články, model:article, and TEXT
Subject:
Geologie. Meteorologie. Klimatologie, seizmicita, seismicity, seismic array, shear wave velocity, surface waves, frequency-time analysis, group velocity, dispersion, 7, and 551
Language:
English
Description:
Rayleigh waves in the period range 0.2 - 3.0 s from eight quarry blasts are analyzed to obtain S-wave velocity model beneath the Příbram seven-station array in the Czech Republic. Locations and origin times of blasts are estimated using P- and S-wave onsets and then verified at the quarry in the vicinity of the location. This blind test confirms a sufficient precision of the location procedure for identification of quarries. Epicentral distances are in the range from 16 to 52 km. Group velocity dispersion curves of Rayleigh waves are determined by the frequency-time analysis. An average group velocity beneath the array for each period is computed with the help of mean travel-time curve for all blasts and stations. The resultant group velocity dispersion curve is inverted to obtain a 1-D S-wave velocity model using the Isometric method. The results are compared with known geological structure in the area of interest., Renata Gaždová, Petr Kolínský, Jiří Málek and Jan Vilhelm., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

20840. Shells of monotone curves

Creator:
Mikeš, Josef and Strambach, Karl
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
Matematika, matematika, mathematics, geodesic, shell of a curve, affine connection, (pseudo-)Riemannian metric, projective equivalence, 13, and 51
Language:
English
Description:
We determine in \mathbb{R}^{n} the form of curves C corresponding to strictly monotone functions as well as the components of affine connections \Delta for which any image of C under a compact-free group Ω of affinities containing the translation group is a geodesic with respect to \Delta . Special attention is paid to the case that Ω contains many dilatations or that C is a curve in \mathbb{R}^{3}. If C is a curve in \mathbb{R}^{3} and Ω is the translation group then we calculate not only the components of the curvature and the Weyl tensor but we also decide when \Delta yields a flat or metrizable space and compute the corresponding metric tensor., Josef Mikeš, Karl Strambach., and Obsahuje seznam literatury
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

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